Ionosphere Model and Tomography
•Download as PPT, PDF•
0 likes•769 views
The document discusses ionosphere modeling and tomography. It aims to learn the temporal and spatial variation of the ionosphere to improve GNSS performance and protect satellites from adverse space environments. Data from 183 stations on May 15, 2012 was used with a 15 degree, 15 order spherical harmonics function to model coefficients, satellite differential code biases, and receiver differential code biases. A simulation of local ionosphere tomography in Hong Kong on May 4, 2009 was also performed.
Report
Share
Report
Share
Recommended
Poster Roseanne Clement
1) The document analyzes optical water types in the Ligurian Sea using data from the REP10 cruise. It finds the sea contains multiple types, varying especially near coasts, rather than just Type III as assumed by current models.
2) Optical profiles from the cruise were processed to determine water types based on Jerlov's classifications. Types were mapped using satellite data and by interpolating in-situ measurements.
3) The analysis shows the solar radiation scheme in ocean models needs redefining as the Ligurian Sea contains differing water types, not just Type III as currently assumed. Future work should collect more open-sea data for improved interpolation.
Two stage deep learning for accelerated 3 d time-of-flight mra without matche...
This document summarizes a two-stage unsupervised learning method for 3D time-of-flight magnetic resonance angiography (TOF-MRA) that accelerates scan time. In the first stage, a physics-informed generative adversarial network reconstructs sub-sampled k-space data in the coronal plane. In the second stage, further enhancement occurs in the axial plane using a multi-headed projection discriminator to better capture blood vessel activation in maximum intensity projections. Quantitative and qualitative results from in vivo data demonstrate the method can accurately reconstruct pathologic lesions while achieving faster scan times compared to conventional compressed sensing techniques.
Spatial data analysis for SWMM
It is a PPT material to do the spatial data analysis for the input file of Storm Water Management Model
Summary Of Se D Da Ra
The document discusses methods for improving the resolution of solar images degraded by atmospheric effects, including the shift and add (SAA) method and self-deconvolving data reconstruction algorithm (SeDDaRA). SAA involves shifting individual images to align a point spread function before adding them together to improve resolution, but it is difficult to apply to extended objects. The document proposes using self-deconvolution to determine the shifting widths for SAA, then applying SAA again using the self-deconvolved frame as the reference frame.
Evaluation of geometrical parameters of buildings from SAR images
This document discusses evaluating geometrical parameters of buildings from SAR images. It presents an algorithm developed to retrieve building orientation, height, and double scattering lines. SAR imaging pros and cons are explained. Electromagnetic scattering models for single and double scattering are described. Simulations are shown for 512x512 and ERS-1 C sensors to test the algorithm under different building orientations. The algorithm uses linear regression to determine building orientation from double scattering lines. Conclusions state the algorithm can accurately retrieve parameters given sufficient dots on scattering lines but the range of evaluable angles is limited.
Pleiades - satellite imagery - very high resolution
With the Pleiades constellation, comprising the Pleiades-1 and Pleiades-2 satellites, Spot Image is set to bring you satellite imagery at a resolution of 50 cm and with a footprint of 20 km x 20 km.
More information on http://www.spotimage.com/pleiades
FR3T10-3-IGARSS2011_Geolocation_20110720.pptx
1) The document proposes a method for correcting geo-location errors in synthetic aperture radar (SAR) images using ground control points (GCPs).
2) GCPs are extracted from both the SAR image and a reference electro-optical (EO) image and used to transform the SAR image into the correct geo-location.
3) Simulation results show that the proposed GCP-based method significantly reduces geo-location errors compared to using just general SAR sensor parameters, with root-mean-square errors reduced from over 1,000 meters to only a few meters.
CAMS General Assembly Chabrillat
This document summarizes an evaluation of an upcoming version of the Copernicus Atmosphere Monitoring Service's (CAMS) global production system. The evaluation compares the operational run (o-suite) to an experimental run (e-suite) that has a higher horizontal resolution and will replace the o-suite. The evaluation found no significant differences between the runs for most species, like ozone and carbon monoxide profiles and surface concentrations. However, improvements were seen for surface ozone and nitrogen dioxide in areas with complex terrain or high pollution, likely due to the increased resolution. Slight degradation was found for dust aerosols in Central Asia in the new run. The e-suite will become operational next week with full evaluation results published
Recommended
Poster Roseanne Clement
1) The document analyzes optical water types in the Ligurian Sea using data from the REP10 cruise. It finds the sea contains multiple types, varying especially near coasts, rather than just Type III as assumed by current models.
2) Optical profiles from the cruise were processed to determine water types based on Jerlov's classifications. Types were mapped using satellite data and by interpolating in-situ measurements.
3) The analysis shows the solar radiation scheme in ocean models needs redefining as the Ligurian Sea contains differing water types, not just Type III as currently assumed. Future work should collect more open-sea data for improved interpolation.
Two stage deep learning for accelerated 3 d time-of-flight mra without matche...
This document summarizes a two-stage unsupervised learning method for 3D time-of-flight magnetic resonance angiography (TOF-MRA) that accelerates scan time. In the first stage, a physics-informed generative adversarial network reconstructs sub-sampled k-space data in the coronal plane. In the second stage, further enhancement occurs in the axial plane using a multi-headed projection discriminator to better capture blood vessel activation in maximum intensity projections. Quantitative and qualitative results from in vivo data demonstrate the method can accurately reconstruct pathologic lesions while achieving faster scan times compared to conventional compressed sensing techniques.
Spatial data analysis for SWMM
It is a PPT material to do the spatial data analysis for the input file of Storm Water Management Model
Summary Of Se D Da Ra
The document discusses methods for improving the resolution of solar images degraded by atmospheric effects, including the shift and add (SAA) method and self-deconvolving data reconstruction algorithm (SeDDaRA). SAA involves shifting individual images to align a point spread function before adding them together to improve resolution, but it is difficult to apply to extended objects. The document proposes using self-deconvolution to determine the shifting widths for SAA, then applying SAA again using the self-deconvolved frame as the reference frame.
Evaluation of geometrical parameters of buildings from SAR images
This document discusses evaluating geometrical parameters of buildings from SAR images. It presents an algorithm developed to retrieve building orientation, height, and double scattering lines. SAR imaging pros and cons are explained. Electromagnetic scattering models for single and double scattering are described. Simulations are shown for 512x512 and ERS-1 C sensors to test the algorithm under different building orientations. The algorithm uses linear regression to determine building orientation from double scattering lines. Conclusions state the algorithm can accurately retrieve parameters given sufficient dots on scattering lines but the range of evaluable angles is limited.
Pleiades - satellite imagery - very high resolution
With the Pleiades constellation, comprising the Pleiades-1 and Pleiades-2 satellites, Spot Image is set to bring you satellite imagery at a resolution of 50 cm and with a footprint of 20 km x 20 km.
More information on http://www.spotimage.com/pleiades
FR3T10-3-IGARSS2011_Geolocation_20110720.pptx
1) The document proposes a method for correcting geo-location errors in synthetic aperture radar (SAR) images using ground control points (GCPs).
2) GCPs are extracted from both the SAR image and a reference electro-optical (EO) image and used to transform the SAR image into the correct geo-location.
3) Simulation results show that the proposed GCP-based method significantly reduces geo-location errors compared to using just general SAR sensor parameters, with root-mean-square errors reduced from over 1,000 meters to only a few meters.
CAMS General Assembly Chabrillat
This document summarizes an evaluation of an upcoming version of the Copernicus Atmosphere Monitoring Service's (CAMS) global production system. The evaluation compares the operational run (o-suite) to an experimental run (e-suite) that has a higher horizontal resolution and will replace the o-suite. The evaluation found no significant differences between the runs for most species, like ozone and carbon monoxide profiles and surface concentrations. However, improvements were seen for surface ozone and nitrogen dioxide in areas with complex terrain or high pollution, likely due to the increased resolution. Slight degradation was found for dust aerosols in Central Asia in the new run. The e-suite will become operational next week with full evaluation results published
Using Pleiades Very High Resolution Images for planning activities in feasib...
This presentation descibes our experience using Pleiades Very high resolution satellite images in mining projects
Terrestrial laser scanning
1. Terrestrial laser scanning (TLS) is an effective technique for 3D building modeling that uses laser rangefinding to rapidly acquire dense 3D point clouds of object surfaces.
2. The document describes the process of using a Leica C10 TLS to collect over 21 million data points from a building in under 7 minutes and then processing the raw data in Cyclone software to generate a 3D model after noise removal and registration.
3. Validation measurements found the TLS measurements to be accurate to within 1 cm on average compared to physical measurements of objects in the building. The document proposes improvements to future TLS data collection and modeling.
Spectral_classification_of_WorldView2_multiangle_sequence.pptx
This presentation discusses using WorldView-2 satellite imagery to classify land cover in Atlanta, Georgia. It combined multi-spectral data with multi-angle observations from 13 images. Four experiments classified imagery using a nadir multi-spectral image only, full multi-angle data, and dimensionality reduction techniques. The multi-angle data improved classification accuracy by 14% over using a single nadir image alone. Specific classes like cars and highways benefited more from the multi-angle information.
Helen Chedzey_The derivation and application of the MODIS 19-band reflectance...
The document summarizes the derivation and validation of a 19-band MODIS surface reflectance product generated by the Perth Node of the TERN AusCover project. It describes how the Simple Method of Atmospheric Correction was used to generate bottom-of-atmosphere reflectances for MODIS bands 1 through 19 and 26. Preliminary validation showed the uncertainty to be comparable to field measurements versus the standard MOD09 product. The new 19-band reflectance product and a validation report will be made available through the AusCover Data Portal by mid-2013.
Gold presentation lastri
The document summarizes the data processing chain for the ALISEO imaging interferometer instrument. It discusses how interferograms captured by the instrument are processed to retrieve at-sensor radiance spectra. The processing involves re-aligning pixel trajectories, interpolating interferograms, removing effects like vignetting and DC offset, and applying an adapted inverse Fourier transform to obtain radiance spectra. Experimental results using laser diodes showed good agreement with the theoretical spectra values.
PARABLE POSTER
Tom McElroy is a professor at York University who works on the PARABLE balloon mission. PARABLE will carry several instruments on a stratospheric balloon flight from Timmins, Ontario in September 2015. The instruments include a modified NO2 Ebert spectrometer, a concave holographic UV-visible spectrometer, and a molecular oxygen spectrometer to measure trace gases and aerosol profiles through solar occultation and nadir viewing. The mission aims to obtain sunrise/sunset occultation measurements and 4 hours of daylight scattered sunlight measurements to validate data from other atmospheric missions like ACE.
DSD-INT 2015 - Workshop quantitative bed dynamics from new bathymetric time s...
Workshop quantitative bed dynamics from new bathymetric time series of the Netherlands continental shelf
Prathipati_Ravi_Poster15-16
This document describes the development and testing of a hexapod image stabilization system to correct for jitter in astronomical imaging. The hexapod thermally isolates components from a cryogenically cooled environment. Extensive bench testing was performed and the hexapod was able to match recorded jitter from a balloon mission. Further minor adjustments are needed before integrating the hexapod with a CCD and thermal control system to meet specifications. Laboratory setup simulates a balloon guide camera and tests the hexapod's ability to counter measured jitter and stabilize images of a simulated star field under vacuum and cryogenic conditions.
Milton analyticalconstellation
The document discusses a new paradigm called the Analytical Constellation that provides frequent multispectral coverage of the UK from DMC satellites with 22m pixel size starting in 2015. It also notes that the EnMAP satellite will provide well-calibrated hyperspectral data at a similar 30km x 30km spatial resolution. A proof-of-concept involved an EnMAP simulation campaign that used Aisa Eagle/Hawk sensors and LiDAR to simulate EnMAP images at 30m pixel size over a test site in Castro Verde, Portugal to analyze traditional farming practices and abandoned fields.
Application of terrestrial 3D laser scanning in building information modellin...
The document discusses the application of terrestrial 3D laser scanning and building information modeling (BIM) technology in the construction industry. It analyzes the working principles and methods of laser scanning, including static and kinematic scanning. It also discusses how laser scanning and BIM can minimize limitations through techniques like noise filtering, image matching, and automated recognition of 3D models. Beneficial outcomes of the technologies include sharing scanning data, predicting trends, and identifying unstable structures through colorization. The document concludes the technologies can dramatically reduce resources and costs compared to traditional methods.
Ieee gold2010 sermi
The document proposes a method to summarize remotely sensed data from over-the-horizon radar systems (OTHR-SW) using sea-land transitions. It involves correlating the received radar echo with a priori knowledge of coastline profiles to geo-reference the data in real-time. This allows the data to be assigned accurate coordinates without needing external data sources. The method is computationally inexpensive and could be used to continuously update an ionospheric model providing information about signal propagation through the ionosphere.
Uncertainty of the Solargis solar radiation database
Uncertainty of the Solargis solar radiation databaseSandia National Laboratories: Energy & Climate: Renewables
This document discusses the uncertainty of solar radiation data from the Solargis database. It describes how Solargis determines uncertainty ranges of ±4-8% for yearly global horizontal irradiation (GHI) and ±8-15% for direct normal irradiation (DNI). The total uncertainty is calculated based on contributions from various uncertainty drivers in the satellite input data and solar radiation models, including clouds, aerosols, water vapor, and terrain variability. Long-term GHI uncertainty can be reduced to ±2.5% by combining satellite data with ground measurements from monitoring stations.Clear sky and all-weather global and beam irradiance models: long term valida...
Clear sky and all-weather global and beam irradiance models: long term valida...Sandia National Laboratories: Energy & Climate: Renewables
This document summarizes the results of a validation study of clear sky and all-weather solar irradiance models. It analyzed over 22 ground measurement sites in Europe and the Mediterranean over periods of up to 8 years. Key findings included:
- Hourly global irradiance models showed no bias and a standard deviation of 17-20%. Beam models had no bias and standard deviation of 34-50%.
- Daily models had no bias for global irradiance with a standard deviation of 8-12%, and no bias for beam with a standard deviation of 20-32%.
- Monthly models had negligible bias and standard deviations of 3-6% for global and 9-17% for beam irradiance.Development and Initial Testing of an Autonomous Surface
1) The document describes the development and initial testing of an autonomous surface vehicle (ASV) for shallow water mapping.
2) Key aspects of the ASV's design are discussed, including its catamaran hull, onboard sensors and computer system, navigation approach, and data collection payload.
3) Initial testing in swimming pools, ponds, and lakes demonstrated the ASV's ability to safely maneuver in shallow areas and collect bathymetry data, filling a gap in current mapping methods. However, further improvements are still needed before fully autonomous deployment.
Generation of one minute data
This document compares existing and new models for generating one minute solar irradiance data and evaluates their performance. It finds that the existing Skartveit&Olseth and Aguiar&Collares-Pereira models do not perform well compared to new models. A new "MN7.2" model based on measured one minute data from various locations outperforms existing models in distribution, autocorrelation, and standard deviation. A "Hofmann" model also performs well. The new models will be included in an upcoming version 7.2 of Meteonorm software, replacing the existing TAG model.
Common Chemometric Indicators for Prediction of Soil Organic Matter Content a...
This document reviews the use of visible and infrared spectroscopy to predict soil organic matter content and quality from soil spectra. It discusses techniques like visible/near infrared, mid infrared spectroscopy and various preprocessing, calibration and validation methods. Least squares support vector machines calibration is recommended as it balances accuracy and generalization. Factors like scale of calibration, accuracy and uncertainties are also covered. The document concludes more robust calibrations are possible with standardization and global spectral libraries, and outlines areas for future work.
Prediction of soil properties with NIR data and site descriptors using prepro...
http://www.fao.org/globalsoilpartnership
This presentation was made during the International Workshop "Soil Spectroscopy: the present and future of Soil Monitoring" that took place at FAO HQ Rome, Italy from 4-6 December 2013. This presentation was made by Matt Aitkenhead, Malcolm Coull & Jean Robertson, and it has the objective to present Prediction of soil properties with NIR data and site descriptors using preprocessing and neural networks.
©FAO: http://www.fao.org
Cosmophysical Simulation
Computer simulations allow scientists to model cosmological events and processes that occur over long timescales or are otherwise impossible to observe directly. Simulations can model galaxy collisions millions of years in the future, particle interactions in accelerators, and help test theoretical models. Specific examples described include a simulation of the future collision between the Milky Way and Andromeda galaxies approximately 4 billion years from now, and simulations of particle interactions in the Large Hadron Collider. While computer simulations provide a useful tool for scientific understanding, they also have disadvantages like high programming complexity and costs and inherent uncertainties in the results.
DSD-INT 2015 - Workshop processing with sentinel toolbox - Jos Maccabiani, Sk...
This document summarizes a presentation on using interferometric synthetic aperture radar (InSAR) to monitor ground deformation from space. It explains that InSAR allows wide-area and fine-resolution monitoring of ground deformation through clouds and at night. Examples are given of using InSAR to monitor deformation related to earthquakes and volcanoes. The presentation discusses how InSAR works by measuring phase differences between acquisitions to detect millimeter-level changes in ground position. It also addresses challenges like phase unwrapping and decorrelation, and shows examples of InSAR monitoring subsidence from oil/gas extraction and underground mining.
Benefit-Cost Analysis of Curve Safety Treatments
A presentation given at the 2016 Traffic Safety Conference during Breakout Session 16: Engineering Countermeasures. By Brad Brimley, Associate Transportation Researcher, Signs and Markings, Texas A&M Transportation Institute
and Bryan Wilson, Associate Research Scientist, Pavements, Texas A&M Transportation Institute
The ionosphere and radio propagation
This document discusses the ionosphere and its role in radio propagation. It provides details on the different layers of the ionosphere (D, E, F1, and F2 layers), how they vary in temperature and electron densities. It explains that the ionosphere consists of ionized particles that behave as plasma and are affected by solar activity like flares and sunspots. The document also discusses how the ionosphere facilitates radio communication by reflecting radio waves back to Earth, allowing transmissions to travel farther than if they simply traveled in straight lines.
Ionosphere variations
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
More Related Content
What's hot
Using Pleiades Very High Resolution Images for planning activities in feasib...
This presentation descibes our experience using Pleiades Very high resolution satellite images in mining projects
Terrestrial laser scanning
1. Terrestrial laser scanning (TLS) is an effective technique for 3D building modeling that uses laser rangefinding to rapidly acquire dense 3D point clouds of object surfaces.
2. The document describes the process of using a Leica C10 TLS to collect over 21 million data points from a building in under 7 minutes and then processing the raw data in Cyclone software to generate a 3D model after noise removal and registration.
3. Validation measurements found the TLS measurements to be accurate to within 1 cm on average compared to physical measurements of objects in the building. The document proposes improvements to future TLS data collection and modeling.
Spectral_classification_of_WorldView2_multiangle_sequence.pptx
This presentation discusses using WorldView-2 satellite imagery to classify land cover in Atlanta, Georgia. It combined multi-spectral data with multi-angle observations from 13 images. Four experiments classified imagery using a nadir multi-spectral image only, full multi-angle data, and dimensionality reduction techniques. The multi-angle data improved classification accuracy by 14% over using a single nadir image alone. Specific classes like cars and highways benefited more from the multi-angle information.
Helen Chedzey_The derivation and application of the MODIS 19-band reflectance...
The document summarizes the derivation and validation of a 19-band MODIS surface reflectance product generated by the Perth Node of the TERN AusCover project. It describes how the Simple Method of Atmospheric Correction was used to generate bottom-of-atmosphere reflectances for MODIS bands 1 through 19 and 26. Preliminary validation showed the uncertainty to be comparable to field measurements versus the standard MOD09 product. The new 19-band reflectance product and a validation report will be made available through the AusCover Data Portal by mid-2013.
Gold presentation lastri
The document summarizes the data processing chain for the ALISEO imaging interferometer instrument. It discusses how interferograms captured by the instrument are processed to retrieve at-sensor radiance spectra. The processing involves re-aligning pixel trajectories, interpolating interferograms, removing effects like vignetting and DC offset, and applying an adapted inverse Fourier transform to obtain radiance spectra. Experimental results using laser diodes showed good agreement with the theoretical spectra values.
PARABLE POSTER
Tom McElroy is a professor at York University who works on the PARABLE balloon mission. PARABLE will carry several instruments on a stratospheric balloon flight from Timmins, Ontario in September 2015. The instruments include a modified NO2 Ebert spectrometer, a concave holographic UV-visible spectrometer, and a molecular oxygen spectrometer to measure trace gases and aerosol profiles through solar occultation and nadir viewing. The mission aims to obtain sunrise/sunset occultation measurements and 4 hours of daylight scattered sunlight measurements to validate data from other atmospheric missions like ACE.
DSD-INT 2015 - Workshop quantitative bed dynamics from new bathymetric time s...
Workshop quantitative bed dynamics from new bathymetric time series of the Netherlands continental shelf
Prathipati_Ravi_Poster15-16
This document describes the development and testing of a hexapod image stabilization system to correct for jitter in astronomical imaging. The hexapod thermally isolates components from a cryogenically cooled environment. Extensive bench testing was performed and the hexapod was able to match recorded jitter from a balloon mission. Further minor adjustments are needed before integrating the hexapod with a CCD and thermal control system to meet specifications. Laboratory setup simulates a balloon guide camera and tests the hexapod's ability to counter measured jitter and stabilize images of a simulated star field under vacuum and cryogenic conditions.
Milton analyticalconstellation
The document discusses a new paradigm called the Analytical Constellation that provides frequent multispectral coverage of the UK from DMC satellites with 22m pixel size starting in 2015. It also notes that the EnMAP satellite will provide well-calibrated hyperspectral data at a similar 30km x 30km spatial resolution. A proof-of-concept involved an EnMAP simulation campaign that used Aisa Eagle/Hawk sensors and LiDAR to simulate EnMAP images at 30m pixel size over a test site in Castro Verde, Portugal to analyze traditional farming practices and abandoned fields.
Application of terrestrial 3D laser scanning in building information modellin...
The document discusses the application of terrestrial 3D laser scanning and building information modeling (BIM) technology in the construction industry. It analyzes the working principles and methods of laser scanning, including static and kinematic scanning. It also discusses how laser scanning and BIM can minimize limitations through techniques like noise filtering, image matching, and automated recognition of 3D models. Beneficial outcomes of the technologies include sharing scanning data, predicting trends, and identifying unstable structures through colorization. The document concludes the technologies can dramatically reduce resources and costs compared to traditional methods.
Ieee gold2010 sermi
The document proposes a method to summarize remotely sensed data from over-the-horizon radar systems (OTHR-SW) using sea-land transitions. It involves correlating the received radar echo with a priori knowledge of coastline profiles to geo-reference the data in real-time. This allows the data to be assigned accurate coordinates without needing external data sources. The method is computationally inexpensive and could be used to continuously update an ionospheric model providing information about signal propagation through the ionosphere.
Uncertainty of the Solargis solar radiation database
Uncertainty of the Solargis solar radiation databaseSandia National Laboratories: Energy & Climate: Renewables
This document discusses the uncertainty of solar radiation data from the Solargis database. It describes how Solargis determines uncertainty ranges of ±4-8% for yearly global horizontal irradiation (GHI) and ±8-15% for direct normal irradiation (DNI). The total uncertainty is calculated based on contributions from various uncertainty drivers in the satellite input data and solar radiation models, including clouds, aerosols, water vapor, and terrain variability. Long-term GHI uncertainty can be reduced to ±2.5% by combining satellite data with ground measurements from monitoring stations.Clear sky and all-weather global and beam irradiance models: long term valida...
Clear sky and all-weather global and beam irradiance models: long term valida...Sandia National Laboratories: Energy & Climate: Renewables
This document summarizes the results of a validation study of clear sky and all-weather solar irradiance models. It analyzed over 22 ground measurement sites in Europe and the Mediterranean over periods of up to 8 years. Key findings included:
- Hourly global irradiance models showed no bias and a standard deviation of 17-20%. Beam models had no bias and standard deviation of 34-50%.
- Daily models had no bias for global irradiance with a standard deviation of 8-12%, and no bias for beam with a standard deviation of 20-32%.
- Monthly models had negligible bias and standard deviations of 3-6% for global and 9-17% for beam irradiance.Development and Initial Testing of an Autonomous Surface
1) The document describes the development and initial testing of an autonomous surface vehicle (ASV) for shallow water mapping.
2) Key aspects of the ASV's design are discussed, including its catamaran hull, onboard sensors and computer system, navigation approach, and data collection payload.
3) Initial testing in swimming pools, ponds, and lakes demonstrated the ASV's ability to safely maneuver in shallow areas and collect bathymetry data, filling a gap in current mapping methods. However, further improvements are still needed before fully autonomous deployment.
Generation of one minute data
This document compares existing and new models for generating one minute solar irradiance data and evaluates their performance. It finds that the existing Skartveit&Olseth and Aguiar&Collares-Pereira models do not perform well compared to new models. A new "MN7.2" model based on measured one minute data from various locations outperforms existing models in distribution, autocorrelation, and standard deviation. A "Hofmann" model also performs well. The new models will be included in an upcoming version 7.2 of Meteonorm software, replacing the existing TAG model.
Common Chemometric Indicators for Prediction of Soil Organic Matter Content a...
This document reviews the use of visible and infrared spectroscopy to predict soil organic matter content and quality from soil spectra. It discusses techniques like visible/near infrared, mid infrared spectroscopy and various preprocessing, calibration and validation methods. Least squares support vector machines calibration is recommended as it balances accuracy and generalization. Factors like scale of calibration, accuracy and uncertainties are also covered. The document concludes more robust calibrations are possible with standardization and global spectral libraries, and outlines areas for future work.
Prediction of soil properties with NIR data and site descriptors using prepro...
http://www.fao.org/globalsoilpartnership
This presentation was made during the International Workshop "Soil Spectroscopy: the present and future of Soil Monitoring" that took place at FAO HQ Rome, Italy from 4-6 December 2013. This presentation was made by Matt Aitkenhead, Malcolm Coull & Jean Robertson, and it has the objective to present Prediction of soil properties with NIR data and site descriptors using preprocessing and neural networks.
©FAO: http://www.fao.org
Cosmophysical Simulation
Computer simulations allow scientists to model cosmological events and processes that occur over long timescales or are otherwise impossible to observe directly. Simulations can model galaxy collisions millions of years in the future, particle interactions in accelerators, and help test theoretical models. Specific examples described include a simulation of the future collision between the Milky Way and Andromeda galaxies approximately 4 billion years from now, and simulations of particle interactions in the Large Hadron Collider. While computer simulations provide a useful tool for scientific understanding, they also have disadvantages like high programming complexity and costs and inherent uncertainties in the results.
DSD-INT 2015 - Workshop processing with sentinel toolbox - Jos Maccabiani, Sk...
This document summarizes a presentation on using interferometric synthetic aperture radar (InSAR) to monitor ground deformation from space. It explains that InSAR allows wide-area and fine-resolution monitoring of ground deformation through clouds and at night. Examples are given of using InSAR to monitor deformation related to earthquakes and volcanoes. The presentation discusses how InSAR works by measuring phase differences between acquisitions to detect millimeter-level changes in ground position. It also addresses challenges like phase unwrapping and decorrelation, and shows examples of InSAR monitoring subsidence from oil/gas extraction and underground mining.
Benefit-Cost Analysis of Curve Safety Treatments
A presentation given at the 2016 Traffic Safety Conference during Breakout Session 16: Engineering Countermeasures. By Brad Brimley, Associate Transportation Researcher, Signs and Markings, Texas A&M Transportation Institute
and Bryan Wilson, Associate Research Scientist, Pavements, Texas A&M Transportation Institute
What's hot (20)
Using Pleiades Very High Resolution Images for planning activities in feasib...
Using Pleiades Very High Resolution Images for planning activities in feasib...
Spectral_classification_of_WorldView2_multiangle_sequence.pptx
Spectral_classification_of_WorldView2_multiangle_sequence.pptx
Helen Chedzey_The derivation and application of the MODIS 19-band reflectance...
Helen Chedzey_The derivation and application of the MODIS 19-band reflectance...
DSD-INT 2015 - Workshop quantitative bed dynamics from new bathymetric time s...
DSD-INT 2015 - Workshop quantitative bed dynamics from new bathymetric time s...
Application of terrestrial 3D laser scanning in building information modellin...
Application of terrestrial 3D laser scanning in building information modellin...
Uncertainty of the Solargis solar radiation database
Uncertainty of the Solargis solar radiation database
Clear sky and all-weather global and beam irradiance models: long term valida...
Clear sky and all-weather global and beam irradiance models: long term valida...
Development and Initial Testing of an Autonomous Surface
Development and Initial Testing of an Autonomous Surface
Common Chemometric Indicators for Prediction of Soil Organic Matter Content a...
Common Chemometric Indicators for Prediction of Soil Organic Matter Content a...
Prediction of soil properties with NIR data and site descriptors using prepro...
Prediction of soil properties with NIR data and site descriptors using prepro...
DSD-INT 2015 - Workshop processing with sentinel toolbox - Jos Maccabiani, Sk...
DSD-INT 2015 - Workshop processing with sentinel toolbox - Jos Maccabiani, Sk...
Viewers also liked
The ionosphere and radio propagation
This document discusses the ionosphere and its role in radio propagation. It provides details on the different layers of the ionosphere (D, E, F1, and F2 layers), how they vary in temperature and electron densities. It explains that the ionosphere consists of ionized particles that behave as plasma and are affected by solar activity like flares and sunspots. The document also discusses how the ionosphere facilitates radio communication by reflecting radio waves back to Earth, allowing transmissions to travel farther than if they simply traveled in straight lines.
Ionosphere variations
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
Hf radio propagation
The document discusses the ionosphere, which is the region of Earth's atmosphere from about 50-500 km above the surface that is ionized by solar radiation. It has four main layers (D, E, F1, F2) that refract radio waves to different degrees. The F2 layer is most important for HF radio propagation as it is present day and night and can reflect the highest frequencies. The ionosphere varies based on the solar cycle, seasons, time of day, and latitude, which affects the usable radio frequencies for communication.
Ionosphere and its effect in Aerial Propagation
The topic is mainly based on the High Frequency spectrum which is effected by Ionosphere.It will discuss the patterns of ionosphere at day and night.
Earths magnetic field
introduction to earths magnetic field, its importance, characteristics and electrical properties of ionosphere.
History communication and development
This document discusses changing paradigms of development and the role of media. It outlines key questions around assumptions of early development thinking and the relationship between media and communication. Early paradigms viewed Western societies as the model and saw media as tools for diffusion and development. However, criticisms emerged around limited media effects, lack of participation, and environmental consequences of growth. New paradigms emphasized multiple pathways for development and the importance of participation and local innovation. The emergence of new communication technologies also changed views on development assistance and information flows.
Wireless ebook-full
This document provides an overview and table of contents for the book "Wireless Networking in the Developing World". The book is a practical guide for planning and building low-cost telecommunications infrastructure. It covers topics such as radio physics, network design, antennas, networking hardware, security, solar power, building outdoor nodes, troubleshooting, and economic sustainability for wireless networks. The document lists over 20 chapters that will be included in the book, with brief descriptions of the topics covered in each chapter.
Transmission lines
This document discusses transposition in transmission lines. Transposition refers to the exchanging of positions of the three conductors in a three-phase transmission line at regular intervals. This is done to equalize the inductance and voltage drop across the conductors since their spacing is unsymmetrical, which would otherwise cause unequal voltage drops along the line. Transposition is important for long transmission lines where voltage unbalance would be significant without it.
Horn antenna
The horn antenna is a hollow, flared structure that is commonly used as a feed element for large satellite dishes and radio telescopes. It works by transmitting electromagnetic waves through its hollow interior in an expanding spherical wavefront pattern. The flare angle affects the beamwidth and phase characteristics. Common horn antenna types include E-plane, H-plane, pyramidal, and conical. Horn antennas provide advantages like simplicity, wide bandwidth, high gain, and ease of excitation. Their performance makes them well-suited for applications like satellite communication, radio astronomy, and antenna calibration.
Radio waves
The document provides information on wave propagation including:
1) It discusses Maxwell's equations and how electric and magnetic fields relate to wave propagation.
2) It describes different modes of propagation including ground waves, space waves, and sky waves. Sky waves involve reflection between the ionosphere and ground to allow long distance transmission.
3) Factors like solar activity and sunspots impact the ionosphere and affect the highest usable frequency for sky wave propagation at different times.
History of communication
It consists of two part and it gives information about history of communication.I believe it will be useful for everyone who searchs for about communication history.Also, I am going to publish the second part coming soon..
Topic 1 basic radio wave properties
Radio technology uses electromagnetic waves to transmit information between locations. Early aircraft radios provided communications, while navigation systems developed later. Modern aircraft use radio for various purposes including communications, navigation, air traffic control, weather avoidance, approach guidance, altitude measurement, and collision avoidance. Radio waves are categorized into frequency bands from very low to extremely high, with aircraft systems using bands from very low to super high frequency.
Chap 02 antenna & wave propagation
This document summarizes key concepts about antennas and wireless signal propagation. It discusses different types of antennas like dipole antennas and parabolic reflective antennas. It also describes the main modes of wireless signal propagation including ground-wave propagation, sky-wave propagation, and line-of-sight propagation. Additionally, it outlines several factors that can impair wireless signals during propagation, such as attenuation, noise, multipath, and atmospheric absorption.
X ray physics part I
Wilhelm Conrad Röentgen was a German physicist who discovered x-rays in 1895. He was awarded the first Nobel Prize in Physics in 1901 for his discovery. Röentgen discovered x-rays accidentally while experimenting with cathode ray tubes. He noticed a fluorescent glow coming from a nearby screen and realized some new type of radiation was causing this. When he placed his wife's hand on photographic plates and exposed them to this radiation, the outline of bones in her hand appeared on the developed plate. This led him to name this new type of radiation "x-rays".
History of communication
This document discusses the history of communication from early methods like smoke signals and drums to modern technologies like radio, television, and the internet. It begins with cave drawings and progresses through messenger pigeons, smoke signals, drums, flags at sea, telegraphs, telephones, and radio. The development of writing and languages like Aramaic and Latin helped communication become more efficient over long distances. New transportation networks for messengers also made delivering messages more reliable. Major inventions in the 18th-19th centuries included the telegraph, telephone, and radio, while the 20th century brought television, computers, and the internet.
Polarization
Polarization is a property of transverse waves where the oscillations occur in one direction rather than randomly in all directions perpendicular to the propagation direction. Unpolarized waves have oscillations in any direction, while linearly polarized waves oscillate in only one direction. Polarization of electromagnetic waves is defined by the electric field. Polarization can occur through selective absorption by materials that preferentially absorb certain oscillation directions, such as Polaroid which absorbs oscillations parallel to its long molecular chains. Many applications rely on polarization, including Polaroid sunglasses, LCD displays, and antennas.
Electromagnetic waves
Electromagnetic waves are formed by vibrating electric charges and can transfer energy through space without matter. They are transverse waves consisting of oscillating electric and magnetic fields. Electromagnetic waves can behave as either waves or particles called photons, with higher frequency waves having shorter wavelengths. The entire range of electromagnetic wave frequencies is called the electromagnetic spectrum.
POLARIZATION
Polarized light is light where the electromagnetic vibrations occur in a single plane rather than randomly. Ordinary unpolarized light has vibrations in all planes perpendicular to propagation, while polarized light restricts vibrations to one direction after reflection or transmission through materials. Polarized light can be linearly, circularly, or elliptically polarized depending on whether the vibration direction remains fixed or rotates as the light propagates. Applications include testing sugar solutions, measuring material stresses, and reducing glare.
Propagation Of Waves
1. Waves propagate or spread outward from their origin through a medium such as air.
2. Electromagnetic waves are created by local disturbances in electric and magnetic fields and propagate uniformly in all directions through a uniform medium.
3. Radio waves can propagate from transmitting to receiving antennas through either ground waves, which travel near the Earth's surface, or sky waves, which are reflected back by the ionosphere.
Radio waves presentation
Radio waves are electromagnetic waves that can range in length from millimeters to over 100,000 km, making them one of the largest types of waves. They are used to transmit signals for radio, television, mobile phones, and other technologies. Radio waves are transmitted through antennas and received by antennas, where a tuner selects the desired frequency. Mobile phones also emit low levels of radio frequency radiation when in use. Television has transitioned from using antennas to receive radio wave signals to digital transmission of signals through networks.
Viewers also liked (20)
Similar to Ionosphere Model and Tomography
Distributed Data Processing using Spark by Panos Labropoulos_and Sarod Yataw...
Spark can help with distributed data processing for radio astronomy in three key ways:
1. It allows for in-memory distributed processing of very large datasets across clusters in a fault-tolerant manner, avoiding unnecessary data movement. This is crucial for processing the exabytes of data expected from projects like the Square Kilometer Array.
2. Spark supports iterative algorithms well through its Resilient Distributed Datasets (RDDs) abstraction, which is important for techniques like calibration and deconvolution.
3. Spark can implement consensus-based distributed optimization algorithms to help with calibration, allowing information to be collectively optimized from data distributed across a network.
Dsbr
Detailed System Baseline Review for the Rocky CUBESAT project by the integrated product team at the University of Alabama in Huntsville (UAH)
Devils Logic PDR presentation
This document outlines a proposed CubeSat mission to study Phobos, one of Mars' moons. A network of 4 CubeSats would work together to overcome limitations of a single CubeSat. Two CubeSats would each carry a spectrometer and camera to analyze surface composition and image Phobos. A third CubeSat would carry an X-ray spectrometer. The fourth CubeSat would function as a communications relay between the network and Earth. This coordinated approach would allow for more comprehensive scientific analysis of Phobos compared to previous single-satellite missions.
A PHYSICAL METHOD TO COMPUTE SURFACE RADIATION FROM GEOSTATIONARY SATELLITES
M Sengupta NREL USA
XVII Simposio Peruano de Energía Solar - IV ISES-CLA
Blog Soluciones solares (solucionessolares.blogspot.com)
2nd CSP Training series : solar resource assessment (1/2)
Fourth session of the 2nd Concentrated Solar Power Training dedicated to solar resource assessment.
DNI measurement: instruments, calibration, maintenance, spectral corrections and accuracies
DNI prediction: various types of radiative models with their pros and cons from validation results
Sources of DNI data for the world: Why do they differ so much, what accuracy can we expect?
Short-term, interannual and long-term variability in DNI
Frequency distribution as a function of climate
Concentrators or flat plates? The Solar Resource Enhancement Factor can help decide
Resource assessment for large projects: Why local measurements are important
A coupled Electromagnetic-Mechanical analysis of next generation Radio Telesc...
This work considers the design of large and complex receivers used in the field of radio astronomy, e.g. for the Square Kilometer Array (SKA) project. The purpose of this work is to consider a coupled simulation where the electromagnetic analysis, performed with the computational electromagnetic software package FEKO, is enhanced by the structural analysis offered by HyperWorks products such as HyperMesh and Optistruct. External influences such as gravity, wind-loading and thermal properties will be taken into account. This will enhance the electromagnetic simulation results, thereby aiding designers to mitigate these environmental effects.
Speakers
Dr. Danie Ludick, Postdoctoral researcher, Stellenbosch University
Remote sensing in space krishna
Remote sensing uses sensors on satellites or aircraft to detect and record electromagnetic radiation from the Earth's surface in order to gather information about it without direct contact. There are six main elements of remote sensing: an energy source, radiation and the atmosphere, interaction with the target, recording by the sensor, transmission and processing, and interpretation and analysis. Applications of remote sensing include space exploration, environmental monitoring, land cover mapping, and studying the effects of deforestation. New technologies are allowing remote sensing instruments to become smaller, use more powerful computing, and observe different frequencies of light.
VHR_preliminary-system_study_issue2
This document provides a preliminary study for the AROSAT satellite system. It discusses several key requirements including coverage area, resolution capabilities, duty cycle, onboard storage and download rates. It evaluates three potential spacecraft configurations and their impact on drag, solar array effectiveness and risk. Configuration #2 is preferred as it minimizes drag while having a simple solar array design. The document also examines how spacecraft altitude affects optical instrument parameters and the propulsion systems needed to compensate for atmospheric drag at different altitudes. Electric propulsion is recommended to enable lower orbits. Overall architectures are proposed for Configuration #2 that could meet requirements.
Improving ambiguity resolution
This document summarizes research on improving ambiguity resolution in GPS positioning using an ionospheric differential correction model. Data was collected from two stations in Malaysia's equatorial region over a short baseline of 33 km. Applying corrections from an ionospheric model led to ambiguities being resolved faster, in under an hour, compared to uncorrected data which took over 2.5 hours. The model also produced smaller standard errors in baseline positioning and increased the variance ratio and decreased reference variance indicators of successful ambiguity resolution. The findings show that an ionospheric differential correction model can improve ambiguity resolution for single frequency GPS over short baselines.
637126main stysley presentation
This proposal seeks funding to develop laser-based optical trapping, or "tractor beams", for remote sampling of particles in space. Tractor beams could non-invasively collect samples from comets, asteroids, planetary atmospheres and surfaces. This would enable new types of sampling missions without landers or sample return. The proposal outlines developing tractor beam technology through lab experiments and scaling it for potential applications on spacecraft. Developing tractor beams could significantly expand NASA's capability to remotely collect and analyze samples throughout the solar system.
Parametric Time Domain Method for separation of Cloud and Drizzle for ARM Clo...
Presentation describes Parametric Time Domain Method (PTDM) to separate cloud and drizzle moments for the W-band ARM cloud radar located at Graciosa Island, Portugal.
Maria's Poster Presentation
This study aims to:
1) Characterize the properties and abundance of blocks in lunar impact craters using radar and imagery data.
2) Determine how block field properties correlate with radar measurements and differ between crater types.
3) Provide insights into the formation and evolution of block fields to help distinguish between blocky ejecta and polar ice deposits.
Pre processing of raw rs data
Raw remote sensing images contain errors that must be corrected through pre-processing before analysis. Pre-processing involves radiometric, geometric, and atmospheric corrections. Radiometric corrections address distortions in pixel values from issues like noise, striping, or dropped scan lines. Geometric corrections rectify distortions caused by terrain, sensor geometry, and platform movement using ground control points. Atmospheric corrections reduce haze effects through techniques like dark object subtraction that assume minimum surface reflectance values. Pre-processing is essential for producing accurate, georeferenced images suitable for analysis and interpretation.
Rahul seminar2 2_for_slideshare.pptx
This presentation cover description of microwave remote sensing, Active and Passive Microwave remote sensing, RADAR, Slant range distortion like Foreshortening and Layover, Sar image and some Recent works in where microwave remote sensing has used to detect natural calamities
Miklovicz thesis defence 2017
This is the presentation for Tamas Miklovicz thesis work defence in 2017, University of Miskolc. The work summarises the geological 3D modelling of the Recsk Cu-Mo porphyry-skarn deposit and gives a overview on the applicability of CHPM technology (http://www.chpm2030.eu).
The full material is available here: https://drive.google.com/open?id=0B0rhl8Z8xjEoZEx3ek5VVnl0WkU
Vegetation monitoring using gpm data over mongolia
Vegetation mapping was conducted over Mongolian land using GPM/DPR satellite data. Backscatter signals from the Ku and Ka band radar were analyzed for different land cover types from 2014-2018. The signals showed incidence angle dependency and seasonal variations that correlated with land cover. Forest had higher backscatter than grass, while desert was lowest. Combining the Ku and Ka band signals using PCA clearly distinguished forest, grass and desert. This new remote sensing method using precipitation radar provides an effective way to continuously map and monitor vegetation dynamics for detecting land degradation.
DGPS
This document contains questions and answers related to GPS surveying techniques. It includes 15 multiple choice questions, 10 true/false statements, and 15 short answer questions about topics such as pseudo-ranges, satellite clock errors, sources of distance calculation errors in GPS, factors to consider when selecting a GPS survey method, real-time kinematic surveying, and types of GPS errors.
data acquisition methods in reverse engineering
This document discusses various data acquisition methods for 3D scanning, including non-contact methods like triangulation, structured lighting, image analysis, and interferometry, as well as contact methods like robotic arm CMM and acoustic. Triangulation uses light sources and cameras to deduce position, while structured lighting projects patterns onto surfaces which are analyzed to determine coordinates. Image analysis examines stereo image pairs to determine height and position. Interferometry projects fringes and analyzes moire patterns to calculate distances and surface coordinates. Tactile methods use mechanical arms to determine relative positions. CMMs can accurately collect data by following planned paths. Acoustic reflects sound off surfaces, while time of flight measures light pulse travel times to determine distances.
A Model for Correction Factors in GPS Signals
This document discusses errors in GPS signals caused by the ionosphere and methods to correct for them. It proposes calculating the total electron content (TEC) along the radio wave path from GPS satellites to receivers to determine ionosphere delay. TEC can be calculated with 2-3 TECU accuracy using GPS measurements. The document presents a method using the Klobuchar algorithm to detect ionosphere errors in satellite positions by calculating slant delay from the ionosphere pierce point. Graphs show greater deviations in receiver position on a disturbed day compared to a quiet day, demonstrating the ionosphere's impact.
Ultimate astronomicalimaging
This document discusses the potential for x-ray interferometry and the Maxim Pathfinder mission concept. It describes how an x-ray interferometer could achieve much higher resolution than current x-ray telescopes by using multiple collector spacecraft separated by long distances. The Maxim Pathfinder would demonstrate 100 microarcsecond resolution using two spacecraft separated by 450 km. System modeling tools would be crucial for development and optimization of the interferometer design.
Similar to Ionosphere Model and Tomography (20)
Distributed Data Processing using Spark by Panos Labropoulos_and Sarod Yataw...
Distributed Data Processing using Spark by Panos Labropoulos_and Sarod Yataw...
A PHYSICAL METHOD TO COMPUTE SURFACE RADIATION FROM GEOSTATIONARY SATELLITES
A PHYSICAL METHOD TO COMPUTE SURFACE RADIATION FROM GEOSTATIONARY SATELLITES
2nd CSP Training series : solar resource assessment (1/2)
2nd CSP Training series : solar resource assessment (1/2)
A coupled Electromagnetic-Mechanical analysis of next generation Radio Telesc...
A coupled Electromagnetic-Mechanical analysis of next generation Radio Telesc...
Parametric Time Domain Method for separation of Cloud and Drizzle for ARM Clo...
Parametric Time Domain Method for separation of Cloud and Drizzle for ARM Clo...
Vegetation monitoring using gpm data over mongolia
Vegetation monitoring using gpm data over mongolia
Ionosphere Model and Tomography
- 1. Ionosphere Modeling and Tomography Cheng Wang Tongji University, Shanghai, China Miami University, Oxford, Ohio, US 2013-02-01
- 2. • Learn temporal and spatial variation • Improve the performance of GNSS • Protect Satellites from bad space environment • Coupling effect of Earthquake
- 3. Incoherent Scatter RadarRocket SoundingTopside SounderIonosonde Spatial and temporal resolution is limited.
- 5. Data: observation of 183 stations on 2012.05.15 Model: 15degree 15order spheric harmonics function Solution: model’s coefficient, satellites’ DCB, and receivers’ DCB Parameters: 16*16*13+183+32=3543 。 Standard deviation of unit weight: 1.6TECU
- 8. Simulation: Hong Kong Local Ionosphere Tomography on 2009.05.04