TU3.T10.5.ppt
•Download as PPT, PDF•
0 likes•166 views
This document summarizes simulations of wave measurements from the SWIM instrument on the upcoming CFOSAT satellite. It describes the SWIM instrument, an end-to-end simulator called SimuSWIM, and results of SimuSWIM simulations for different sea states, including a real case from a 2002 storm. The simulations demonstrate SWIM's ability to accurately estimate wave direction, wavelength, and energy to within 15 degrees, 10-20%, and 15% respectively compared to reference wave model data.
Report
Share
Report
Share
![Estimation of wave spectra with SWIM on CFOSAT – illustration on a real case C. Tison (1 ) , C. Manent (2) , T. Amiot (1) , V. Enjolras (3) , D. Hauser (2) , L. Rey (3) , P. Castillan (1) (1) CNES, « Altimetry and Radar » department, France (2) UVSQ, CNRS, LATMOS-IPSL, France (3) Thalès Alenia Space, France [email_address]](https://image.slidesharecdn.com/tu3-110726164845-phpapp01/85/TU3-T10-5-ppt-1-320.jpg)
![Overview of the presentation ,[object Object],[object Object],[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Recommended
IAHR 2015 - Operational wave forecasts in the southern North Sea, Gautier, De...
The document describes operational wave forecast models in the Southern North Sea called SWAN-North Sea, which consists of the rectangular SWAN-DCSM model and the nested curvilinear SWAN-ZUNO model. The models are forced by wind from the HIRLAM model, wave boundary conditions from the WAM model, and water levels and currents from the WAQUA model. The models were calibrated and the best settings were found to be Komen whitecapping with a value of 0, and reduced bottom friction, resulting in a HE10 bias of -8%, Hm0 bias of 4%, and Tm-1,0 bias of -11%.
TU1.T10.2.pptx
This document describes a new ocean vector wind retrieval technique for tropical cyclones called X-Winds. X-Winds uses a specialized geophysical model function trained on hurricane data to account for backscatter saturation with wind speed and rain effects. It estimates wind direction from the anisotropy in forward and aft radar measurements, then estimates wind speed using the estimated wind direction. Comparisons with H*Wind analysis and QuikSCAT data show X-Winds provides improved wind speed and direction estimates over standard products in hurricanes. A new SeaWinds tropical cyclone ocean vector winds dataset will be produced using this technique.
IAHR 2015 - Validation of SWAN under extreme conditions in the Wadden Sea, Ca...
The document summarizes a study that assessed the performance of the SWAN wave model under extreme conditions in the Wadden Sea. Stationary SWAN computations were performed for 8 time periods during a storm in December 2013 and results were validated against measurements from multiple wave buoys. Different SWAN settings were tested, including default settings as well as configurations with and without currents. The reference SWAN settings that include currents performed best. While currents had a limited direct effect on wave growth, omitting them led to degraded results. The updated default SWAN settings performed better than previous defaults. In conclusion, SWAN can accurately model nearshore waves during storms in the Wadden Sea when appropriate settings are used.
DSD-INT 2014 - SWAN Advanced Course - 01 - General introduction to waves and ...
This document provides an overview of waves and the SWAN wave model. It discusses wave generation by wind, propagation processes like shoaling and refraction, and dissipation mechanisms like whitecapping and bottom friction. The SWAN model is introduced as solving the action density balance equation. Source terms like wind input and dissipation parameterizations are explained. The document concludes with details on the SWAN North Sea implementation, including grid specifications, boundary conditions, and validation results.
igarss_2011_cfosat.ppt
The CFOSAT mission is a joint China-France satellite mission launching in 2015 to measure oceanic wind and wave spectra globally using new scatterometer instruments. The mission aims to improve wind and wave forecasts through simultaneous wind and wave measurements from its SWIM wave scatterometer and SCAT wind scatterometer. CFOSAT will provide directional wave spectra and wind vectors over the global oceans to advance understanding of ocean-atmosphere processes.
On_the_development_of_dualfrq_PR_china(Tiger).ppt
1. The document discusses the development of spaceborne rain radar technology in China, including results from an airborne field campaign testing a dual-frequency rain radar.
2. The field campaign involved comparing measurements from the airborne Ku-band and Ka-band radars to measurements from the TRMM satellite precipitation radar and a ground-based weather radar.
3. The results showed the airborne radar measurements were generally consistent with the TRMM and ground radar measurements, indicating the airborne radar met its design requirements for rain detection sensitivity, sidelobe levels, and range resolution.
Navaids
The document discusses various navigation aids used in aviation including VOR, ILS, DME, RNAV, satellite navigation, and inertial navigation systems. It provides information on how each system works and applications for en-route and approach navigation. Examples of flight plans and charts are also mentioned.
DSD-INT - SWAN Advanced Course - 02 - Setting up a SWAN computation
The document discusses setting up a SWAN wave model computation. Key steps include:
1) Defining the area and resolution of the computational grid in both spatial (x,y) and spectral (frequency, direction) dimensions.
2) Setting the boundary conditions, physics options, and numerics parameters.
3) Conducting sensitivity tests, calibration, and validation by comparing model results to measurements.
Recommended
IAHR 2015 - Operational wave forecasts in the southern North Sea, Gautier, De...
The document describes operational wave forecast models in the Southern North Sea called SWAN-North Sea, which consists of the rectangular SWAN-DCSM model and the nested curvilinear SWAN-ZUNO model. The models are forced by wind from the HIRLAM model, wave boundary conditions from the WAM model, and water levels and currents from the WAQUA model. The models were calibrated and the best settings were found to be Komen whitecapping with a value of 0, and reduced bottom friction, resulting in a HE10 bias of -8%, Hm0 bias of 4%, and Tm-1,0 bias of -11%.
TU1.T10.2.pptx
This document describes a new ocean vector wind retrieval technique for tropical cyclones called X-Winds. X-Winds uses a specialized geophysical model function trained on hurricane data to account for backscatter saturation with wind speed and rain effects. It estimates wind direction from the anisotropy in forward and aft radar measurements, then estimates wind speed using the estimated wind direction. Comparisons with H*Wind analysis and QuikSCAT data show X-Winds provides improved wind speed and direction estimates over standard products in hurricanes. A new SeaWinds tropical cyclone ocean vector winds dataset will be produced using this technique.
IAHR 2015 - Validation of SWAN under extreme conditions in the Wadden Sea, Ca...
The document summarizes a study that assessed the performance of the SWAN wave model under extreme conditions in the Wadden Sea. Stationary SWAN computations were performed for 8 time periods during a storm in December 2013 and results were validated against measurements from multiple wave buoys. Different SWAN settings were tested, including default settings as well as configurations with and without currents. The reference SWAN settings that include currents performed best. While currents had a limited direct effect on wave growth, omitting them led to degraded results. The updated default SWAN settings performed better than previous defaults. In conclusion, SWAN can accurately model nearshore waves during storms in the Wadden Sea when appropriate settings are used.
DSD-INT 2014 - SWAN Advanced Course - 01 - General introduction to waves and ...
This document provides an overview of waves and the SWAN wave model. It discusses wave generation by wind, propagation processes like shoaling and refraction, and dissipation mechanisms like whitecapping and bottom friction. The SWAN model is introduced as solving the action density balance equation. Source terms like wind input and dissipation parameterizations are explained. The document concludes with details on the SWAN North Sea implementation, including grid specifications, boundary conditions, and validation results.
igarss_2011_cfosat.ppt
The CFOSAT mission is a joint China-France satellite mission launching in 2015 to measure oceanic wind and wave spectra globally using new scatterometer instruments. The mission aims to improve wind and wave forecasts through simultaneous wind and wave measurements from its SWIM wave scatterometer and SCAT wind scatterometer. CFOSAT will provide directional wave spectra and wind vectors over the global oceans to advance understanding of ocean-atmosphere processes.
On_the_development_of_dualfrq_PR_china(Tiger).ppt
1. The document discusses the development of spaceborne rain radar technology in China, including results from an airborne field campaign testing a dual-frequency rain radar.
2. The field campaign involved comparing measurements from the airborne Ku-band and Ka-band radars to measurements from the TRMM satellite precipitation radar and a ground-based weather radar.
3. The results showed the airborne radar measurements were generally consistent with the TRMM and ground radar measurements, indicating the airborne radar met its design requirements for rain detection sensitivity, sidelobe levels, and range resolution.
Navaids
The document discusses various navigation aids used in aviation including VOR, ILS, DME, RNAV, satellite navigation, and inertial navigation systems. It provides information on how each system works and applications for en-route and approach navigation. Examples of flight plans and charts are also mentioned.
DSD-INT - SWAN Advanced Course - 02 - Setting up a SWAN computation
The document discusses setting up a SWAN wave model computation. Key steps include:
1) Defining the area and resolution of the computational grid in both spatial (x,y) and spectral (frequency, direction) dimensions.
2) Setting the boundary conditions, physics options, and numerics parameters.
3) Conducting sensitivity tests, calibration, and validation by comparing model results to measurements.
TU3.T10.3.ppt
1. The document describes using Ku-band SAR along-track interferometry (ATI) to measure sea surface currents from an airborne SAR system. 2. Flight tests were conducted over Asahi Reef in Japan, where tidal currents ranged from 0.7-0.9 m/s. 3. Analysis of perpendicular flight lines using ATI yielded a two-dimensional surface current map with velocities matching ground truths of 0.7-0.9 m/s within 10m resolution cells.
3 Blackwell_IGARSS11_2860_MO3.T04.3.pptx
This document discusses prelaunch testing and post-launch validation plans for the Advanced Technology Microwave Sounder (ATMS) on the NPP satellite. Key points:
- ATMS underwent antenna pattern testing using a Compact Antenna Test Range to verify beam pointing accuracy and efficiency. Radiometric thermal vacuum testing validated the sensor meets specifications and defined calibration parameters.
- Post-launch calibration/validation has four phases: activation, checkout, intensive calibration/validation, and long-term trending. It involves evaluating sensor performance, verifying data records, tuning algorithms, and using techniques like satellite maneuvers and simultaneous nadir overpasses.
- Plans aim to fully characterize the sensor and produce high-quality
igarss2011_lion.pptx
This document discusses modeling and applications of SWOT satellite data. The SWOT mission, launching in 2019, will use Ka-band radar interferometry and a wide swath altimeter to measure ocean and inland water elevations. A simulator was developed to generate realistic SWOT observations for scientific users studying hydrology. The simulator works quickly, is easy to use, and incorporates errors from various sources like thermal noise and baseline variation. The simulator output has been used to assimilate simulated SWOT data into hydraulic models of rivers, like the Ohio River, to estimate water surface elevations. Further improvements to the simulator are still needed to account for additional error sources like layover and atmospheric delays.
MO4.L09 - POTENTIAL AND LIMITATIONS OF FORWARD-LOOKING BISTATIC SAR
This document discusses the potential and limitations of forward-looking bistatic synthetic aperture radar (SAR). It describes the bistatic geometry and iso-range and iso-Doppler contours in the bistatic case. It also details an experiment using TerraSAR-X and PAMIR SAR to image in the forward and backward directions and demonstrates the feasibility of bistatic forward-looking SAR. Resolution analysis and experimental results showing raw data, range compressed data, and comparison to optical images are also presented.
IGARSS11_FFBP_CSAR_v3.ppt
The document discusses fast factorized back projection (FFBP) for processing circular synthetic aperture radar (CSAR) data. FFBP was adapted for CSAR by modifying the orientation of the polar grids used at each subaperture to follow the circular trajectory. Experimental results using real CSAR data from Germany's E-SAR system validated the FFBP-CSAR algorithm, showing high accuracy and significant speed improvements over conventional backprojection. The algorithm is now being used to process data from new multi-circular flight campaigns.
AGU2014-SA31B-4098
This document summarizes a study of mesospheric gravity waves over McMurdo Station, Antarctica using infrared imaging:
1) Over 400 short-period gravity waves were observed between March-September 2012, with average horizontal wavelength of 22 km, phase speed of 42 m/s, and period of 12 minutes.
2) Waves exhibited seasonal variations in propagation direction, with northwest in fall expanding to northeast and southwest in winter and more isotropic propagation in late winter.
3) Analysis of 73 continuous hours in June revealed over 40 gravity wave events with characteristics consistent with full season results. Diurnal and semidiurnal tides were also observed.
4) Later season observations in August showed higher average phase
4_Ship detection using X-band dual-pol SAR data.ppt
This document summarizes research on ship detection using X-band dual-polarization synthetic aperture radar (SAR) data. It describes an airborne SAR campaign conducted over the Mediterranean Sea to study ship detection capabilities at different incidence angles and sea states. Analysis of the SAR data showed that dual-polarization data provided better ship detection than single-polarization, especially at deeper incidence angles. For more grazing angles, using sub-apertures of the SAR data was more effective than dual-polarization methods. The optimal configuration was found to be two disjoint sub-apertures in the range direction using the co-polarization channel.
Richard Perez - GW Solar Symposium 2012
The document discusses solar resource variability and its implications for distributed photovoltaic generation. It finds that variability decreases with larger spatial scales as locations become less correlated over distances. Temporal variability also decreases at longer time intervals as fluctuations average out. The key implications are that second to minute scale fluctuations are important for individual systems, while hour or longer scales are important for utility-scale impacts where variability can be mitigated through geographic dispersion of solar generation across large areas.
RADAR
Radar uses radio waves to detect distant objects. It works by transmitting radio pulses and measuring their reflection off targets to determine range, angle, speed and other characteristics. There are two main types of radar: continuous wave radar which transmits a continuous radio signal, and pulsed radar which uses high power pulses. Radar has many applications including air traffic control, weather observation, speed enforcement, and military uses like air defense and missile guidance. It can operate in all weather conditions and is a vital detection system.
A Evolução das Técnicas de Aquisição Sísmica Marítima para a Coleta de Dados ...
A Evolução das Técnicas de Aquisição Sísmica Marítima para a Coleta de Dados ...Grupo de Geofísica Computacional, UNICAMP
Palestra proferida por Franck Le Diagon (WesternGeco) durante a III Semana de Inverno de Geofísica, IMECC, UNICAMP, 2012.Synthetic aperture radar
This document provides an overview of synthetic aperture radar (SAR). SAR uses motion of a radar antenna mounted on a moving platform to synthesize a large antenna and create high-resolution radar images. It describes the basic principles of SAR, including how successive radar pulses are transmitted and echoes received to build up an image. Applications of SAR include remote sensing, mapping, and monitoring changes over time. Spectral estimation techniques are used to process SAR data and improve resolution. Polarimetry and interferometry are additional SAR techniques. Typical SAR systems are mounted on aircraft or satellites.
FR4.TO5.5.ppt
The document summarizes the key factors affecting the performance of the PARIS In-Orbit Demonstrator ocean altimeter. It discusses factors such as onboard calibration, uncertainties in geometry/orbit, use of multiple frequencies, waveform retracking, and the impact of ionosphere corrections. It estimates that the PARIS IoD could achieve a total altimetry accuracy of 18cm, demonstrating its suitability for mesoscale ocean altimetry applications such as tsunami monitoring.
TU1.T10.5.ppt
The document presents a new technique called C-2PO for retrieving wind speeds from cross-polarized synthetic aperture radar (SAR) data during hurricanes. C-2PO uses the cross-polarization ratio, which is insensitive to wind direction and incidence angle, making it easier to map to wind speed compared to existing techniques. Comparisons show C-2PO provides more accurate wind speed retrievals than existing methods for hurricanes, with lower biases and errors. Reasons C-2PO performs better include existing models saturating at high winds and not accounting for rain and other factors.
TU1.T10.5.ppt
The document presents a new technique called C-2PO for retrieving wind speeds from cross-polarized synthetic aperture radar (SAR) data during hurricanes. C-2PO uses the cross-polarization ratio, which is insensitive to wind direction and incidence angle, making it easier to map to wind speed compared to existing techniques. Comparisons show C-2PO provides more accurate wind speed retrievals than existing methods for hurricanes, with lower biases and errors. Reasons include existing models becoming saturated at high winds and not accounting for rain and other factors that impact radar backscatter.
TU2.T10.2.ppt
The document discusses how ocean surface features can impact wind retrieval from synthetic aperture radar (SAR) data. SAR wind retrieval relies on geophysical model functions (GMFs) that relate normalized radar cross-section (NRCS) to wind speed, but factors like sea surface temperature (SST) patterns, sea ice, ships and platforms, and internal waves can influence NRCS and introduce errors. The authors evaluate methods to account for SST effects, finding their proposed NRCS-SST correction model can reduce wind speed root mean square error to less than 2 m/s when validated against buoy data. In general, calibrating SAR data, developing multi-polarization GMFs, and implementing preprocessing to compensate for environmental
Unsteady Potential Flow Calculations on a Horizontal Axis Marine Current Turb...
Three-dimensional unsteady potential flow calculations for a horizontal axis marine current turbine with a low order potential based panel method, originally developed for marine propellers, are presented. The analysis is carried out for straight and yawed flow conditions for a turbine with controllable pitch for two different pitch settings in a wide range of tip-speed-ratios. An empirical vortex model is assumed for the turbine wake which includes the variation of pitch of the helicoidal vortices behind the blades. Comparison of numerical calculations with experimental measurements available in the literature and effect of the tidal velocity profile on the turbine blade loadings are presented.
TU3.T10.3.ppt
1. The document describes using Ku-band SAR along-track interferometry (ATI) to measure sea surface currents from an airborne SAR system. 2. Flight tests were conducted over Asahi Reef in Japan, where tidal currents ranged from 0.7-0.9 m/s. 3. Analysis of perpendicular flight lines using ATI yielded a two-dimensional surface current map with velocities matching ground truths of 0.7-0.9 m/s within 10m resolution cells.
TU3.T10.3.ppt
1. The document describes using Ku-band SAR along-track interferometry (ATI) to measure sea surface currents from an airborne SAR system. 2. Flight tests were conducted over Asahi Reef in Japan, where tidal currents ranged from 0.7-0.9 m/s. 3. Analysis of perpendicular flight lines using ATI yielded a two-dimensional surface current map with velocities matching ground truths of 0.7-0.9 m/s, validating the SAR ATI technique.
presentation_meissner.pptx
This document summarizes research on measuring all-weather wind speeds using both passive microwave radiometers and active microwave scatterometers. It discusses the challenges of high wind speeds (>20 m/s) and winds in rain, and improvements made to wind retrieval algorithms. An improved Ku-band geophysical model function (GMF) for QuikSCAT was developed using WindSat winds for validation. Comparisons show WindSat provides more accurate winds than QuikSCAT in rain. The study concludes that while passive radiometers have strengths at high winds and in rain, scatterometers remain impacted without dual-frequency capabilities.
TU4.L10 - A REVISED GEOPHYSICAL MODEL FUNCTION FOR THE ADVANCED SCATTEROMETER...
The document presents a revised geophysical model function (GMF) for estimating high wind speeds from Advanced Scatterometer (ASCAT) radar backscatter measurements. The operational ASCAT GMF (CMOD5.n) underestimates winds speeds above 40 m/s. The revised GMF replaces the B0 term with one derived from airborne scatterometer data, improving correlations with in-situ and other satellite wind measurements at high wind speeds. Validation shows the new GMF reduces biases and errors versus other data, increasing detection of gale-force and hurricane-force winds.
Rocca.ppt
The document discusses advances in SAR interferometry over the past 20 years for measuring millimeter-scale land motion. Key points include:
1) Revisit times have decreased from 35 days with ERS-1 to 12 days with Sentinel-1 constellations, improving ground motion recovery.
2) Persistent scatterer interferometry techniques like SqueeSAR can now measure motions to the millimeter by using all available interferograms.
3) Atmospheric phase screens still limit accuracy but can be estimated and removed using numerical weather models, GPS, and other independent datasets.
4) Future opportunities include using wide Doppler bandwidths from satellites to achieve high-resolution azimuth measurements of ground motion.
EVALUATIONS OF WIND VECTORS OBSERVED BY ASCAT USING STATISTICAL DISTRIBUTIONS
The document evaluates wind vectors observed by the Advanced Scatterometer (ASCAT) satellite using statistical analysis. It finds that ASCAT wind speeds and directions agree well with buoy observations. Global wind speed histograms vary by cross-track cell location. ASCAT wind directions show directivity relative to the antenna beams, with low wind speeds and outer cells showing alignment to the flight direction. Similar analyses are conducted for Oceansat-II scatterometer (OSCAT) data.
More Related Content
What's hot
TU3.T10.3.ppt
1. The document describes using Ku-band SAR along-track interferometry (ATI) to measure sea surface currents from an airborne SAR system. 2. Flight tests were conducted over Asahi Reef in Japan, where tidal currents ranged from 0.7-0.9 m/s. 3. Analysis of perpendicular flight lines using ATI yielded a two-dimensional surface current map with velocities matching ground truths of 0.7-0.9 m/s within 10m resolution cells.
3 Blackwell_IGARSS11_2860_MO3.T04.3.pptx
This document discusses prelaunch testing and post-launch validation plans for the Advanced Technology Microwave Sounder (ATMS) on the NPP satellite. Key points:
- ATMS underwent antenna pattern testing using a Compact Antenna Test Range to verify beam pointing accuracy and efficiency. Radiometric thermal vacuum testing validated the sensor meets specifications and defined calibration parameters.
- Post-launch calibration/validation has four phases: activation, checkout, intensive calibration/validation, and long-term trending. It involves evaluating sensor performance, verifying data records, tuning algorithms, and using techniques like satellite maneuvers and simultaneous nadir overpasses.
- Plans aim to fully characterize the sensor and produce high-quality
igarss2011_lion.pptx
This document discusses modeling and applications of SWOT satellite data. The SWOT mission, launching in 2019, will use Ka-band radar interferometry and a wide swath altimeter to measure ocean and inland water elevations. A simulator was developed to generate realistic SWOT observations for scientific users studying hydrology. The simulator works quickly, is easy to use, and incorporates errors from various sources like thermal noise and baseline variation. The simulator output has been used to assimilate simulated SWOT data into hydraulic models of rivers, like the Ohio River, to estimate water surface elevations. Further improvements to the simulator are still needed to account for additional error sources like layover and atmospheric delays.
MO4.L09 - POTENTIAL AND LIMITATIONS OF FORWARD-LOOKING BISTATIC SAR
This document discusses the potential and limitations of forward-looking bistatic synthetic aperture radar (SAR). It describes the bistatic geometry and iso-range and iso-Doppler contours in the bistatic case. It also details an experiment using TerraSAR-X and PAMIR SAR to image in the forward and backward directions and demonstrates the feasibility of bistatic forward-looking SAR. Resolution analysis and experimental results showing raw data, range compressed data, and comparison to optical images are also presented.
IGARSS11_FFBP_CSAR_v3.ppt
The document discusses fast factorized back projection (FFBP) for processing circular synthetic aperture radar (CSAR) data. FFBP was adapted for CSAR by modifying the orientation of the polar grids used at each subaperture to follow the circular trajectory. Experimental results using real CSAR data from Germany's E-SAR system validated the FFBP-CSAR algorithm, showing high accuracy and significant speed improvements over conventional backprojection. The algorithm is now being used to process data from new multi-circular flight campaigns.
AGU2014-SA31B-4098
This document summarizes a study of mesospheric gravity waves over McMurdo Station, Antarctica using infrared imaging:
1) Over 400 short-period gravity waves were observed between March-September 2012, with average horizontal wavelength of 22 km, phase speed of 42 m/s, and period of 12 minutes.
2) Waves exhibited seasonal variations in propagation direction, with northwest in fall expanding to northeast and southwest in winter and more isotropic propagation in late winter.
3) Analysis of 73 continuous hours in June revealed over 40 gravity wave events with characteristics consistent with full season results. Diurnal and semidiurnal tides were also observed.
4) Later season observations in August showed higher average phase
4_Ship detection using X-band dual-pol SAR data.ppt
This document summarizes research on ship detection using X-band dual-polarization synthetic aperture radar (SAR) data. It describes an airborne SAR campaign conducted over the Mediterranean Sea to study ship detection capabilities at different incidence angles and sea states. Analysis of the SAR data showed that dual-polarization data provided better ship detection than single-polarization, especially at deeper incidence angles. For more grazing angles, using sub-apertures of the SAR data was more effective than dual-polarization methods. The optimal configuration was found to be two disjoint sub-apertures in the range direction using the co-polarization channel.
Richard Perez - GW Solar Symposium 2012
The document discusses solar resource variability and its implications for distributed photovoltaic generation. It finds that variability decreases with larger spatial scales as locations become less correlated over distances. Temporal variability also decreases at longer time intervals as fluctuations average out. The key implications are that second to minute scale fluctuations are important for individual systems, while hour or longer scales are important for utility-scale impacts where variability can be mitigated through geographic dispersion of solar generation across large areas.
RADAR
Radar uses radio waves to detect distant objects. It works by transmitting radio pulses and measuring their reflection off targets to determine range, angle, speed and other characteristics. There are two main types of radar: continuous wave radar which transmits a continuous radio signal, and pulsed radar which uses high power pulses. Radar has many applications including air traffic control, weather observation, speed enforcement, and military uses like air defense and missile guidance. It can operate in all weather conditions and is a vital detection system.
A Evolução das Técnicas de Aquisição Sísmica Marítima para a Coleta de Dados ...
A Evolução das Técnicas de Aquisição Sísmica Marítima para a Coleta de Dados ...Grupo de Geofísica Computacional, UNICAMP
Palestra proferida por Franck Le Diagon (WesternGeco) durante a III Semana de Inverno de Geofísica, IMECC, UNICAMP, 2012.Synthetic aperture radar
This document provides an overview of synthetic aperture radar (SAR). SAR uses motion of a radar antenna mounted on a moving platform to synthesize a large antenna and create high-resolution radar images. It describes the basic principles of SAR, including how successive radar pulses are transmitted and echoes received to build up an image. Applications of SAR include remote sensing, mapping, and monitoring changes over time. Spectral estimation techniques are used to process SAR data and improve resolution. Polarimetry and interferometry are additional SAR techniques. Typical SAR systems are mounted on aircraft or satellites.
FR4.TO5.5.ppt
The document summarizes the key factors affecting the performance of the PARIS In-Orbit Demonstrator ocean altimeter. It discusses factors such as onboard calibration, uncertainties in geometry/orbit, use of multiple frequencies, waveform retracking, and the impact of ionosphere corrections. It estimates that the PARIS IoD could achieve a total altimetry accuracy of 18cm, demonstrating its suitability for mesoscale ocean altimetry applications such as tsunami monitoring.
TU1.T10.5.ppt
The document presents a new technique called C-2PO for retrieving wind speeds from cross-polarized synthetic aperture radar (SAR) data during hurricanes. C-2PO uses the cross-polarization ratio, which is insensitive to wind direction and incidence angle, making it easier to map to wind speed compared to existing techniques. Comparisons show C-2PO provides more accurate wind speed retrievals than existing methods for hurricanes, with lower biases and errors. Reasons C-2PO performs better include existing models saturating at high winds and not accounting for rain and other factors.
TU1.T10.5.ppt
The document presents a new technique called C-2PO for retrieving wind speeds from cross-polarized synthetic aperture radar (SAR) data during hurricanes. C-2PO uses the cross-polarization ratio, which is insensitive to wind direction and incidence angle, making it easier to map to wind speed compared to existing techniques. Comparisons show C-2PO provides more accurate wind speed retrievals than existing methods for hurricanes, with lower biases and errors. Reasons include existing models becoming saturated at high winds and not accounting for rain and other factors that impact radar backscatter.
TU2.T10.2.ppt
The document discusses how ocean surface features can impact wind retrieval from synthetic aperture radar (SAR) data. SAR wind retrieval relies on geophysical model functions (GMFs) that relate normalized radar cross-section (NRCS) to wind speed, but factors like sea surface temperature (SST) patterns, sea ice, ships and platforms, and internal waves can influence NRCS and introduce errors. The authors evaluate methods to account for SST effects, finding their proposed NRCS-SST correction model can reduce wind speed root mean square error to less than 2 m/s when validated against buoy data. In general, calibrating SAR data, developing multi-polarization GMFs, and implementing preprocessing to compensate for environmental
Unsteady Potential Flow Calculations on a Horizontal Axis Marine Current Turb...
Three-dimensional unsteady potential flow calculations for a horizontal axis marine current turbine with a low order potential based panel method, originally developed for marine propellers, are presented. The analysis is carried out for straight and yawed flow conditions for a turbine with controllable pitch for two different pitch settings in a wide range of tip-speed-ratios. An empirical vortex model is assumed for the turbine wake which includes the variation of pitch of the helicoidal vortices behind the blades. Comparison of numerical calculations with experimental measurements available in the literature and effect of the tidal velocity profile on the turbine blade loadings are presented.
What's hot (16)
MO4.L09 - POTENTIAL AND LIMITATIONS OF FORWARD-LOOKING BISTATIC SAR
MO4.L09 - POTENTIAL AND LIMITATIONS OF FORWARD-LOOKING BISTATIC SAR
4_Ship detection using X-band dual-pol SAR data.ppt
4_Ship detection using X-band dual-pol SAR data.ppt
A Evolução das Técnicas de Aquisição Sísmica Marítima para a Coleta de Dados ...
A Evolução das Técnicas de Aquisição Sísmica Marítima para a Coleta de Dados ...
Unsteady Potential Flow Calculations on a Horizontal Axis Marine Current Turb...
Unsteady Potential Flow Calculations on a Horizontal Axis Marine Current Turb...
Similar to TU3.T10.5.ppt
TU3.T10.3.ppt
1. The document describes using Ku-band SAR along-track interferometry (ATI) to measure sea surface currents from an airborne SAR system. 2. Flight tests were conducted over Asahi Reef in Japan, where tidal currents ranged from 0.7-0.9 m/s. 3. Analysis of perpendicular flight lines using ATI yielded a two-dimensional surface current map with velocities matching ground truths of 0.7-0.9 m/s within 10m resolution cells.
TU3.T10.3.ppt
1. The document describes using Ku-band SAR along-track interferometry (ATI) to measure sea surface currents from an airborne SAR system. 2. Flight tests were conducted over Asahi Reef in Japan, where tidal currents ranged from 0.7-0.9 m/s. 3. Analysis of perpendicular flight lines using ATI yielded a two-dimensional surface current map with velocities matching ground truths of 0.7-0.9 m/s, validating the SAR ATI technique.
presentation_meissner.pptx
This document summarizes research on measuring all-weather wind speeds using both passive microwave radiometers and active microwave scatterometers. It discusses the challenges of high wind speeds (>20 m/s) and winds in rain, and improvements made to wind retrieval algorithms. An improved Ku-band geophysical model function (GMF) for QuikSCAT was developed using WindSat winds for validation. Comparisons show WindSat provides more accurate winds than QuikSCAT in rain. The study concludes that while passive radiometers have strengths at high winds and in rain, scatterometers remain impacted without dual-frequency capabilities.
TU4.L10 - A REVISED GEOPHYSICAL MODEL FUNCTION FOR THE ADVANCED SCATTEROMETER...
The document presents a revised geophysical model function (GMF) for estimating high wind speeds from Advanced Scatterometer (ASCAT) radar backscatter measurements. The operational ASCAT GMF (CMOD5.n) underestimates winds speeds above 40 m/s. The revised GMF replaces the B0 term with one derived from airborne scatterometer data, improving correlations with in-situ and other satellite wind measurements at high wind speeds. Validation shows the new GMF reduces biases and errors versus other data, increasing detection of gale-force and hurricane-force winds.
Rocca.ppt
The document discusses advances in SAR interferometry over the past 20 years for measuring millimeter-scale land motion. Key points include:
1) Revisit times have decreased from 35 days with ERS-1 to 12 days with Sentinel-1 constellations, improving ground motion recovery.
2) Persistent scatterer interferometry techniques like SqueeSAR can now measure motions to the millimeter by using all available interferograms.
3) Atmospheric phase screens still limit accuracy but can be estimated and removed using numerical weather models, GPS, and other independent datasets.
4) Future opportunities include using wide Doppler bandwidths from satellites to achieve high-resolution azimuth measurements of ground motion.
EVALUATIONS OF WIND VECTORS OBSERVED BY ASCAT USING STATISTICAL DISTRIBUTIONS
The document evaluates wind vectors observed by the Advanced Scatterometer (ASCAT) satellite using statistical analysis. It finds that ASCAT wind speeds and directions agree well with buoy observations. Global wind speed histograms vary by cross-track cell location. ASCAT wind directions show directivity relative to the antenna beams, with low wind speeds and outer cells showing alignment to the flight direction. Similar analyses are conducted for Oceansat-II scatterometer (OSCAT) data.
Absolute Measurement Of The Acceleration Due To Gravity In Greece
This technical report details absolute measurements of the acceleration due to gravity (g) conducted in Italy, Greece, France, and Germany between 1996-1998. An instrument designed by the Istituto di Metrologia 'G. Colonnetti' was used to measure g through free fall acceleration measurements. The report provides the measurement methods, instrument details, measurement uncertainty analysis, experimental results including g values and uncertainties for each site, and figures/tables of measurement data.
【潔能講堂】大型風力發電廠之發電效率分析與預測
1) The document discusses numerical modeling of power losses in large wind farms due to turbine wakes. Large-eddy simulation (LES) coupled with actuator disk models are used to model turbine wakes.
2) Validation studies of the numerical models are needed using data from offshore wind farms, wind tunnels, and field experiments. Remote sensing tools like LIDAR are important for obtaining field measurements.
3) The case study uses LES with an actuator disk model that considers turbine rotation (ADM-R) to simulate turbine wakes in the Horns Rev offshore wind farm and predict overall farm power output with good agreement with observed data.
bettenhausen_igarss11_talk.pdf
WindSat provides fully polarimetric microwave radiometer measurements to retrieve ocean surface wind vectors in near-real-time. Statistical evaluations show good agreement with QuikSCAT below 20 m/s wind speed. Future plans include improving retrievals in rain conditions through modifications to the forward model, retrieval algorithm, and calibration analyses. Addressing radio frequency interference and Faraday rotation effects will also enhance the wind vector retrievals.
DSD-INT 2017 Ocean wave spectra from phase averaged models and remote sensing...
Presentation by Fabrice Ardhuin (Ifremer) at the XBeach X (10th Year Anniversary) Conference, during Delft Software Days - Edition 2017. Wednesday, 1 November 2017, Delft.
Fukao Plenary.ppt
1) Advances in radar techniques have allowed for continuous observation of the Earth's atmosphere from the lower to upper atmosphere. 2) The latest techniques include active phased array radars like the MU radar in Japan which can rapidly scan beams to accurately measure wind velocity. 3) Atmospheric radars provide high resolution continuous data on winds and have revealed processes like gravity wave propagation, saturation and their influence on mean flows.
NineYearsofAtmosphericRemoteSensingwithSCIAMACHY-InstrumentPerformance.ppt
This document summarizes the performance and operations of the SCIAMACHY instrument over its 9 years in orbit onboard the ENVISAT satellite. It describes the instrument design and components, its various viewing modes, thermal subsystem used to control temperatures, highly autonomous operations, degradation of certain components over time, and how the mission was adapted to continue collecting data after the nominal mission ended by changing to a modified drifting orbit. It also provides an overview of the key topics covered in the document.
ÖNCEL AKADEMİ: İSTANBUL DEPREMİ
We perform stochastic finite fault simulations of ground motions in Istanbul, Turkey based on fault rupture scenarios. The region is divided into grids and synthetic site-specific ground motions are generated for each grid using calibrated source, path, and site models. The models are calibrated by simulating a 2011 M5.1 earthquake in the Marmara Sea. Grid-based synthetic ground motions are generated for Istanbul for a M7.4 earthquake scenario. Model parameters are verified by comparing to ground motion prediction equations.
IGARSSAirSWOTv2.ppt
AirSwot is an airborne radar system called KaSPAR that will be used to calibrate and validate the SWOT satellite mission. KaSPAR will make high-accuracy elevation maps with a 5km swath from an altitude of 35,000 feet to replicate SWOT's measurements over various terrain. It will also gather additional data on water temporal correlation, elevation, backscatter, and vegetation attenuation to help classify landscapes and predict SWOT's performance. The system draws on heritage from previous airborne radars and will fly on the NASA King Air to begin engineering flights in 2012 for SWOT calibration prior to its launch.
Presentation
This document provides an overview of gravity and seismic geophysical exploration methods. It begins with introductions to gravity, its units of measurement, and factors that cause gravity variations. It then discusses gravity data acquisition, processing steps like tidal and elevation corrections to derive anomaly maps, and interpretation. For seismic exploration, it describes data acquisition using common midpoint gathers and factors like fold, followed by processing steps like normal moveout correction and stacking to improve signal-to-noise ratio and imaging resolutions. It concludes with discussions on filtering, migration, and how these improve subsurface representations.
ppt pres coastalt 2011.ppt
The researchers used HF radar coastal currents to generate synthetic sea surface height fields from CODAR ocean current data. They compared the CODAR heights to Jason-2 altimetry retracked using different methods in the coastal zone of California. They found the Ice3 and OCE retrackers generally matched the CODAR heights better than Red3, except during blooming events where sea state varied more. Improving altimeter retracking based on CODAR heights and sea state conditions could increase the accuracy of coastal altimetry sea surface height measurements.
MEA
This proposal recommends a comprehensive radar system for Paducah, KY to monitor storms. It describes Paducah's climate with frequent convective storms covering large areas, though isolated cells are common. The system aims to observe fast-moving storms with high resolution while seeing distant storms. It proposes one S-band radar to scan 250km and detect distant storms, and two C-band radars near Paducah scanning 87.5km with higher resolution to observe storm evolution and winds over the city. The temporal resolution is 5 minutes to track rapid storm changes.
CWW-(El-Salloum New Marina) Drawing.pdf
Graduation project (Excellent)
Coastal Processes Assessment and Marina Design, EL-Sallume, Egyptian North coast.
EL-Sallume new marina is a proposed project in Egyptian North Coast that aims to provide a unique experience through linking the marina with the Exterior Oases corridor.
The project consisted of four stages, The first was Metocean study including data collection, data analysis and spectral wave modelling using Mike21 SWs. The second was detailed design of marine structures. Third stage was estimating the cost of the project (BOQ). Finally, environmental impact assessment (EIA)
TH1.T04.2_MULTI-FREQUENCY MICROWAVE EMISSION OF THE EAST ANTARCTIC PLATEAU_IG...
The document summarizes an experiment called Domex-2 that was conducted at Dome C, Antarctica between 2008-2010 to measure microwave emission from the East Antarctic plateau using ground-based and satellite instruments. Measurements from the Domex-2 radiometers showed high temporal stability of brightness temperatures at vertical polarization but more fluctuation at horizontal polarization as expected. Angular trends from Domex-2 matched well with data from the SMOS satellite. An electromagnetic model was developed and validated against the satellite and ground measurements, demonstrating the mechanisms controlling microwave emission from the ice sheet.
Pieter Toor Veripos
Real-time tidal observation is possible using high-accuracy GPS positioning systems. VERIPOS has implemented this using their Ultra PPP system, which provides 10-20cm vertical accuracy. This allows correlation between GPS heights and tides after removing vessel motion effects. Two tidal estimates are provided - an "Ultra Tide" after 39 hours of averaging, and an instantaneous "Geoid Tide" based on the EGM96 geoid model. VERIPOS tidal estimates have been validated against predicted tides and tide gauges with standard deviations of 10-13cm. The method provides benefits over traditional tide gauges for applications like bathymetry and current prediction.
Similar to TU3.T10.5.ppt (20)
TU4.L10 - A REVISED GEOPHYSICAL MODEL FUNCTION FOR THE ADVANCED SCATTEROMETER...
TU4.L10 - A REVISED GEOPHYSICAL MODEL FUNCTION FOR THE ADVANCED SCATTEROMETER...
EVALUATIONS OF WIND VECTORS OBSERVED BY ASCAT USING STATISTICAL DISTRIBUTIONS
EVALUATIONS OF WIND VECTORS OBSERVED BY ASCAT USING STATISTICAL DISTRIBUTIONS
Absolute Measurement Of The Acceleration Due To Gravity In Greece
Absolute Measurement Of The Acceleration Due To Gravity In Greece
DSD-INT 2017 Ocean wave spectra from phase averaged models and remote sensing...
DSD-INT 2017 Ocean wave spectra from phase averaged models and remote sensing...
NineYearsofAtmosphericRemoteSensingwithSCIAMACHY-InstrumentPerformance.ppt
NineYearsofAtmosphericRemoteSensingwithSCIAMACHY-InstrumentPerformance.ppt
TH1.T04.2_MULTI-FREQUENCY MICROWAVE EMISSION OF THE EAST ANTARCTIC PLATEAU_IG...
TH1.T04.2_MULTI-FREQUENCY MICROWAVE EMISSION OF THE EAST ANTARCTIC PLATEAU_IG...
More from grssieee
SEGMENTATION OF POLARIMETRIC SAR DATA WITH A MULTI-TEXTURE PRODUCT MODEL
1) The document describes a segmentation algorithm for polarimetric SAR (PolSAR) data that can model both scalar-texture and multi-texture scattering.
2) The algorithm uses log-cumulants and hypothesis testing to determine whether a scalar-texture or dual-texture model best fits the data within each segment.
3) The algorithm is tested on simulated multi-texture PolSAR data and is shown to accurately segment the classes and estimate their texture parameters. However, when applied to real data sets, the algorithm only finds the simpler scalar-texture case.
TWO-POINT STATISTIC OF POLARIMETRIC SAR DATA TWO-POINT STATISTIC OF POLARIMET...
This document discusses using wavelet transforms to analyze two-point statistics of polarimetric synthetic aperture radar (PolSAR) data. It introduces wavelet variance and kurtosis as metrics that can be applied to PolSAR data transformed using a wavelet frame. It then provides an example of applying this analysis to ALOS PALSAR data over Hawaii's Papau Seamount to characterize sea surface features.
THE SENTINEL-1 MISSION AND ITS APPLICATION CAPABILITIES
The Sentinel-1 mission is part of the GMES program and consists of two satellites to provide C-band SAR data for emergency response, marine and land monitoring, and other applications. The satellites operate in a near-polar orbit with a 12 day repeat cycle. The main acquisition mode is an interferometric wide swath mode with 5m range and 20m azimuth resolution over a 250km swath. Sentinel-1 will support operational services and create a long-term SAR data archive.
GMES SPACE COMPONENT:PROGRAMMATIC STATUS
The document summarizes the status of the GMES Space Component program. It describes the Sentinel satellite missions for monitoring land, ocean, atmosphere and emergency situations. The Sentinels will provide long-term data continuity as well as improved coverage compared to existing missions. Sentinel data will be freely and openly available to both operational users and the science community. The program is on track, with the first Sentinel launches beginning in 2013.
PROGRESSES OF DEVELOPMENT OF CFOSAT SCATTEROMETER
The document describes the progress of the development of CFOSAT SCAT, a Ku-band scatterometer onboard the Chinese-French Oceanography Satellite (CFOSAT). CFOSAT will measure global ocean surface winds and waves to improve weather forecasting, ocean dynamics modeling, climate research, and understanding of surface processes. The SCAT instrument is a rotating fan-beam radar scatterometer that will retrieve wind vectors using measurements of backscatter at incidence angles from 26 to 46 degrees. It has a wide swath of over 1000km and specifications are designed to achieve high-precision wind measurements globally. System details including parameters and the operation mode are provided.
DEVELOPMENT OF ALGORITHMS AND PRODUCTS FOR SUPPORTING THE ITALIAN HYPERSPECTR...
The document describes the SAP4PRISMA project which aims to develop algorithms and products to support the Italian hyperspectral PRISMA Earth observation mission. The project will focus on data processing, quality assessment, classification methods, and generating level 3 and 4 products for applications like land monitoring, agriculture, and hazard monitoring. It will include the generation of "PRISMA-like" synthetic test data to support algorithm development and validation. The research will be carried out across multiple work packages focusing on topics like data quality, classification methods, calibration/validation, and developing applicative products.
EO-1/HYPERION: NEARING TWELVE YEARS OF SUCCESSFUL MISSION SCIENCE OPERATION A...
1) The EO-1 Hyperion instrument has collected over 65,000 scenes over its 12-year mission to study land and coastal ecosystems using imaging spectroscopy.
2) Studies using Hyperion data have identified spectral indices related to chlorophyll that correlate with carbon flux measurements at different sites, including a Zambian woodland and North Carolina forest sites.
3) Time series of Hyperion data at flux tower sites show seasonal changes in these spectral indices that match patterns in ecosystem carbon uptake and release.
EO-1/HYPERION: NEARING TWELVE YEARS OF SUCCESSFUL MISSION SCIENCE OPERATION A...
1) The EO-1 Hyperion instrument has collected over 65,000 scenes over its 12-year mission to study land and coastal ecosystems using imaging spectroscopy.
2) Studies using Hyperion data have identified spectral indices related to chlorophyll that correlate with carbon flux measurements at different forest, grassland, and woodland sites globally.
3) Time series of Hyperion data at sites in Zambia, North Carolina, and Kansas show seasonal changes in these spectral indices that match patterns in ecosystem carbon uptake and release measured by flux towers.
EO-1/HYPERION: NEARING TWELVE YEARS OF SUCCESSFUL MISSION SCIENCE OPERATION A...
EO-1/Hyperion has been collecting hyperspectral imagery for over 12 years, acquiring over 65,000 scenes. Researchers have been using these data to develop and validate algorithms for estimating vegetation properties like fraction of absorbed photosynthetically active radiation (fAPAR) and photochemical reflectance index (PRI). Comparisons of Hyperion data to field measurements at flux tower sites show these algorithms can accurately track vegetation changes over time and relate spectral properties to productivity metrics like light use efficiency and gross ecosystem productivity. This work is helping prototype data products for the upcoming HyspIRI mission.
Test
This document is a return and exchange form for a wetsuit company. It provides instructions for customers to fill out when returning an undamaged item for a refund, exchange, or size change. The form requests information like the customer's order details, contact information, the suit being returned and its size, the reason for return, and if applicable, the new desired size. It also provides the return shipping address and notifies customers that the company is not responsible for lost or damaged return packages.
2011_Fox_Tax_Worksheets.pdf
This document provides instructions for clients of Fox Tax Planning and Preparation for preparing to have their taxes filed. It lists important income and deduction documentation to bring to an appointment, such as W-2s, 1099s, receipts for donations. It also includes an engagement letter detailing the services to be provided, responsibilities of both parties, fees, and electronic filing and signature procedures. Clients are asked to sign the letter agreeing to the terms and return it along with their tax information.
Tana_IGARSS2011.ppt
The document discusses mapping wetlands in North America using MODIS 500m imagery. It describes wetlands and existing global wetland databases. The methodology uses MODIS data from 2008, digital elevation models, and reference data to classify wetlands into three types - forest/shrub dominant wetlands, herbaceous dominant wetlands, and sea grass dominant wetlands. Training data is collected from existing land cover maps and Landsat imagery. A decision tree model and maximum likelihood classification are applied to extract wetlands from other land covers.
Solaro_IGARSS_2011.ppt
The document summarizes research using SBAS-DInSAR (Small BAseline Subset differential interferometric synthetic aperture radar) techniques to analyze ground deformation at Mt. Etna volcano in Italy over the last 18 years using ERS and ENVISAT satellite data. The analysis revealed three main deformation processes: inflation of the volcanic edifice, subsidence of sectors on the eastern flank due to gravitational spreading, and deflation-inflation cycles associated with eruptive and post-eruptive activity. More recent analysis using higher resolution COSMO-SkyMed data from 2009-2010 detected deformation related to faults and a 2010 earthquake more precisely than lower resolution ENVISAT data.
More from grssieee (20)
Tangent height accuracy of Superconducting Submillimeter-Wave Limb-Emission S...
Tangent height accuracy of Superconducting Submillimeter-Wave Limb-Emission S...
SEGMENTATION OF POLARIMETRIC SAR DATA WITH A MULTI-TEXTURE PRODUCT MODEL
SEGMENTATION OF POLARIMETRIC SAR DATA WITH A MULTI-TEXTURE PRODUCT MODEL
TWO-POINT STATISTIC OF POLARIMETRIC SAR DATA TWO-POINT STATISTIC OF POLARIMET...
TWO-POINT STATISTIC OF POLARIMETRIC SAR DATA TWO-POINT STATISTIC OF POLARIMET...
THE SENTINEL-1 MISSION AND ITS APPLICATION CAPABILITIES
THE SENTINEL-1 MISSION AND ITS APPLICATION CAPABILITIES
DEVELOPMENT OF ALGORITHMS AND PRODUCTS FOR SUPPORTING THE ITALIAN HYPERSPECTR...
DEVELOPMENT OF ALGORITHMS AND PRODUCTS FOR SUPPORTING THE ITALIAN HYPERSPECTR...
EO-1/HYPERION: NEARING TWELVE YEARS OF SUCCESSFUL MISSION SCIENCE OPERATION A...
EO-1/HYPERION: NEARING TWELVE YEARS OF SUCCESSFUL MISSION SCIENCE OPERATION A...
EO-1/HYPERION: NEARING TWELVE YEARS OF SUCCESSFUL MISSION SCIENCE OPERATION A...
EO-1/HYPERION: NEARING TWELVE YEARS OF SUCCESSFUL MISSION SCIENCE OPERATION A...
EO-1/HYPERION: NEARING TWELVE YEARS OF SUCCESSFUL MISSION SCIENCE OPERATION A...
EO-1/HYPERION: NEARING TWELVE YEARS OF SUCCESSFUL MISSION SCIENCE OPERATION A...
Recently uploaded
Introduction of Cybersecurity with OSS at Code Europe 2024
I develop the Ruby programming language, RubyGems, and Bundler, which are package managers for Ruby. Today, I will introduce how to enhance the security of your application using open-source software (OSS) examples from Ruby and RubyGems.
The first topic is CVE (Common Vulnerabilities and Exposures). I have published CVEs many times. But what exactly is a CVE? I'll provide a basic understanding of CVEs and explain how to detect and handle vulnerabilities in OSS.
Next, let's discuss package managers. Package managers play a critical role in the OSS ecosystem. I'll explain how to manage library dependencies in your application.
I'll share insights into how the Ruby and RubyGems core team works to keep our ecosystem safe. By the end of this talk, you'll have a better understanding of how to safeguard your code.
Your One-Stop Shop for Python Success: Top 10 US Python Development Providers
Simplify your search for a reliable Python development partner! This list presents the top 10 trusted US providers offering comprehensive Python development services, ensuring your project's success from conception to completion.
Programming Foundation Models with DSPy - Meetup Slides
Prompting language models is hard, while programming language models is easy. In this talk, I will discuss the state-of-the-art framework DSPy for programming foundation models with its powerful optimizers and runtime constraint system.
How to Interpret Trends in the Kalyan Rajdhani Mix Chart.pdf
A Mix Chart displays historical data of numbers in a graphical or tabular form. The Kalyan Rajdhani Mix Chart specifically shows the results of a sequence of numbers over different periods.
Main news related to the CCS TSI 2023 (2023/1695)
An English 🇬🇧 translation of a presentation to the speech I gave about the main changes brought by CCS TSI 2023 at the biggest Czech conference on Communications and signalling systems on Railways, which was held in Clarion Hotel Olomouc from 7th to 9th November 2023 (konferenceszt.cz). Attended by around 500 participants and 200 on-line followers.
The original Czech 🇨🇿 version of the presentation can be found here: https://www.slideshare.net/slideshow/hlavni-novinky-souvisejici-s-ccs-tsi-2023-2023-1695/269688092 .
The videorecording (in Czech) from the presentation is available here: https://youtu.be/WzjJWm4IyPk?si=SImb06tuXGb30BEH .
June Patch Tuesday
Ivanti’s Patch Tuesday breakdown goes beyond patching your applications and brings you the intelligence and guidance needed to prioritize where to focus your attention first. Catch early analysis on our Ivanti blog, then join industry expert Chris Goettl for the Patch Tuesday Webinar Event. There we’ll do a deep dive into each of the bulletins and give guidance on the risks associated with the newly-identified vulnerabilities.
AI 101: An Introduction to the Basics and Impact of Artificial Intelligence
Imagine a world where machines not only perform tasks but also learn, adapt, and make decisions. This is the promise of Artificial Intelligence (AI), a technology that's not just enhancing our lives but revolutionizing entire industries.
Presentation of the OECD Artificial Intelligence Review of Germany
Consult the full report at https://www.oecd.org/digital/oecd-artificial-intelligence-review-of-germany-609808d6-en.htm
Taking AI to the Next Level in Manufacturing.pdf
Read Taking AI to the Next Level in Manufacturing to gain insights on AI adoption in the manufacturing industry, such as:
1. How quickly AI is being implemented in manufacturing.
2. Which barriers stand in the way of AI adoption.
3. How data quality and governance form the backbone of AI.
4. Organizational processes and structures that may inhibit effective AI adoption.
6. Ideas and approaches to help build your organization's AI strategy.
Generating privacy-protected synthetic data using Secludy and Milvus
During this demo, the founders of Secludy will demonstrate how their system utilizes Milvus to store and manipulate embeddings for generating privacy-protected synthetic data. Their approach not only maintains the confidentiality of the original data but also enhances the utility and scalability of LLMs under privacy constraints. Attendees, including machine learning engineers, data scientists, and data managers, will witness first-hand how Secludy's integration with Milvus empowers organizations to harness the power of LLMs securely and efficiently.
How to Get CNIC Information System with Paksim Ga.pptx
Pakdata Cf is a groundbreaking system designed to streamline and facilitate access to CNIC information. This innovative platform leverages advanced technology to provide users with efficient and secure access to their CNIC details.
Choosing The Best AWS Service For Your Website + API.pptx
Have you ever been confused by the myriad of choices offered by AWS for hosting a website or an API?
Lambda, Elastic Beanstalk, Lightsail, Amplify, S3 (and more!) can each host websites + APIs. But which one should we choose?
Which one is cheapest? Which one is fastest? Which one will scale to meet our needs?
Join me in this session as we dive into each AWS hosting service to determine which one is best for your scenario and explain why!
Columbus Data & Analytics Wednesdays - June 2024
Columbus Data & Analytics Wednesdays, June 2024 with Maria Copot 20
Cosa hanno in comune un mattoncino Lego e la backdoor XZ?
ABSTRACT: A prima vista, un mattoncino Lego e la backdoor XZ potrebbero avere in comune il fatto di essere entrambi blocchi di costruzione, o dipendenze di progetti creativi e software. La realtà è che un mattoncino Lego e il caso della backdoor XZ hanno molto di più di tutto ciò in comune.
Partecipate alla presentazione per immergervi in una storia di interoperabilità, standard e formati aperti, per poi discutere del ruolo importante che i contributori hanno in una comunità open source sostenibile.
BIO: Sostenitrice del software libero e dei formati standard e aperti. È stata un membro attivo dei progetti Fedora e openSUSE e ha co-fondato l'Associazione LibreItalia dove è stata coinvolta in diversi eventi, migrazioni e formazione relativi a LibreOffice. In precedenza ha lavorato a migrazioni e corsi di formazione su LibreOffice per diverse amministrazioni pubbliche e privati. Da gennaio 2020 lavora in SUSE come Software Release Engineer per Uyuni e SUSE Manager e quando non segue la sua passione per i computer e per Geeko coltiva la sua curiosità per l'astronomia (da cui deriva il suo nickname deneb_alpha).
Artificial Intelligence for XMLDevelopment
In the rapidly evolving landscape of technologies, XML continues to play a vital role in structuring, storing, and transporting data across diverse systems. The recent advancements in artificial intelligence (AI) present new methodologies for enhancing XML development workflows, introducing efficiency, automation, and intelligent capabilities. This presentation will outline the scope and perspective of utilizing AI in XML development. The potential benefits and the possible pitfalls will be highlighted, providing a balanced view of the subject.
We will explore the capabilities of AI in understanding XML markup languages and autonomously creating structured XML content. Additionally, we will examine the capacity of AI to enrich plain text with appropriate XML markup. Practical examples and methodological guidelines will be provided to elucidate how AI can be effectively prompted to interpret and generate accurate XML markup.
Further emphasis will be placed on the role of AI in developing XSLT, or schemas such as XSD and Schematron. We will address the techniques and strategies adopted to create prompts for generating code, explaining code, or refactoring the code, and the results achieved.
The discussion will extend to how AI can be used to transform XML content. In particular, the focus will be on the use of AI XPath extension functions in XSLT, Schematron, Schematron Quick Fixes, or for XML content refactoring.
The presentation aims to deliver a comprehensive overview of AI usage in XML development, providing attendees with the necessary knowledge to make informed decisions. Whether you’re at the early stages of adopting AI or considering integrating it in advanced XML development, this presentation will cover all levels of expertise.
By highlighting the potential advantages and challenges of integrating AI with XML development tools and languages, the presentation seeks to inspire thoughtful conversation around the future of XML development. We’ll not only delve into the technical aspects of AI-powered XML development but also discuss practical implications and possible future directions.
National Security Agency - NSA mobile device best practices
Threats to mobile devices are more prevalent and increasing in scope and complexity. Users of mobile devices desire to take full advantage of the features
available on those devices, but many of the features provide convenience and capability but sacrifice security. This best practices guide outlines steps the users can take to better protect personal devices and information.
Skybuffer SAM4U tool for SAP license adoption
Manage and optimize your license adoption and consumption with SAM4U, an SAP free customer software asset management tool.
SAM4U, an SAP complimentary software asset management tool for customers, delivers a detailed and well-structured overview of license inventory and usage with a user-friendly interface. We offer a hosted, cost-effective, and performance-optimized SAM4U setup in the Skybuffer Cloud environment. You retain ownership of the system and data, while we manage the ABAP 7.58 infrastructure, ensuring fixed Total Cost of Ownership (TCO) and exceptional services through the SAP Fiori interface.
20240609 QFM020 Irresponsible AI Reading List May 2024
Everything I found interesting about the irresponsible use of machine intelligence in May 2024
Recently uploaded (20)
Introduction of Cybersecurity with OSS at Code Europe 2024
Introduction of Cybersecurity with OSS at Code Europe 2024
Your One-Stop Shop for Python Success: Top 10 US Python Development Providers
Your One-Stop Shop for Python Success: Top 10 US Python Development Providers
Programming Foundation Models with DSPy - Meetup Slides
Programming Foundation Models with DSPy - Meetup Slides
How to Interpret Trends in the Kalyan Rajdhani Mix Chart.pdf
How to Interpret Trends in the Kalyan Rajdhani Mix Chart.pdf
AI 101: An Introduction to the Basics and Impact of Artificial Intelligence
AI 101: An Introduction to the Basics and Impact of Artificial Intelligence
Presentation of the OECD Artificial Intelligence Review of Germany
Presentation of the OECD Artificial Intelligence Review of Germany
Deep Dive: AI-Powered Marketing to Get More Leads and Customers with HyperGro...
Deep Dive: AI-Powered Marketing to Get More Leads and Customers with HyperGro...
Generating privacy-protected synthetic data using Secludy and Milvus
Generating privacy-protected synthetic data using Secludy and Milvus
How to Get CNIC Information System with Paksim Ga.pptx
How to Get CNIC Information System with Paksim Ga.pptx
Choosing The Best AWS Service For Your Website + API.pptx
Choosing The Best AWS Service For Your Website + API.pptx
Cosa hanno in comune un mattoncino Lego e la backdoor XZ?
Cosa hanno in comune un mattoncino Lego e la backdoor XZ?
National Security Agency - NSA mobile device best practices
National Security Agency - NSA mobile device best practices
20240609 QFM020 Irresponsible AI Reading List May 2024
20240609 QFM020 Irresponsible AI Reading List May 2024
TU3.T10.5.ppt
- 1. Estimation of wave spectra with SWIM on CFOSAT – illustration on a real case C. Tison (1 ) , C. Manent (2) , T. Amiot (1) , V. Enjolras (3) , D. Hauser (2) , L. Rey (3) , P. Castillan (1) (1) CNES, « Altimetry and Radar » department, France (2) UVSQ, CNRS, LATMOS-IPSL, France (3) Thalès Alenia Space, France [email_address]
- 4. SWIM instrument (1/2) SWIM : S urface W ave I nvestigation and M onitoring Ku-band radar (scatterometer) 6 beams
- 6. Estimation of wave spectra Wave topography: ξ(x,y) Directional wave spectrum F(k x ,k y ) Modulation of the backscattering coefficient Signal modulation Modulation spectrum P m Received power Wave slopes Link slope/signal modulation
- 11. Impact of migrations (2/2) (a) Reference 2D modulation spectrum (b) Estimated 2D modulation spectrum WITHOUT complete migration (c) Estimated 2D modulation spectrum WITH complete migrations Direction Wave- length Energy Swell 0° 0° 0% 3% 13% 10% Wind sea 11° 14° 27% 16% 19% 12%
- 13. A real sea state condition: “Prestige case”
- 16. 1D modulation spectra 6h UTC Swell Φ =135° (SE-NW look direction) Sea wind Φ = 235° (NE-SW look direction) Φ = angle between satellite track (assumed S-N) and radar look direction
- 17. 00:00 UTC 06:00 UTC 08:00 UTC 15:00 UTC 10:00 UTC Reference: 2D spectrum from WAM model CFOSAT/SWIM estimation (simulations from SimuSWIM) Hs: 6.5 m U: 17.3 m/s Hs: 6.1 m U: 8.8 m/s Hs: 5.8 m U: 22.2 m/s Hs: 5.1 m U: 11.7 m/s Hs: 6.5 m U: 21.0 m/s Prestige SOS 14:00 UTC
- 18. Performance quality Estimation errors on wave direction ( Φ ), wave wavelength ( λ ) and energy (E): <15° <10-20% <15% Requirements: 5% 19% 7° 6% 12% 3° 15h 7% 6% 11° 8% 8% 0° 10h 6% 18% 11° 7% 1% 0° 08h 19% 27% 11° 13% 0% 0° 06h - - - 4% 0% 3° 00h E λ Φ E λ Φ WIND SEA SWELL