SUNVISION Technologies Pvt. Ltd provides affordable, high quality 3D Scanning Services, 3D Laser Scanning and 3D Digitizing. SUNVISION offers total solutions to the industry ranging from 2D to 3D Data Conversion,3D solid Modeling,Data Capturing using 3D White Light Scanning & 3D Inspection using Photogramtry."/>
SUNVISION Technologies Pvt. Ltd provides affordable, high quality 3D Scanning Services, 3D Laser Scanning and 3D Digitizing. SUNVISION offers total solutions to the industry ranging from 2D to 3D Data Conversion,3D solid Modeling,Data Capturing using 3D White Light Scanning & 3D Inspection using Photogramtry."/>
Radar image and it's acquisition have been described shortly here. Image processing methods like applying filters have been described briefly. The last part of the presentation contains some application of radar images.
AstroAccelerate - GPU Accelerated Signal Processing on the Path to the Square...inside-BigData.com
In this deck from the GPU Technology Conference, Wes Armour from the Oxford eResearch Centre discusses the role of GPUs in processing large amounts of astronomical data collected by the Square Kilometre Array and how CUDA is the best suited option for their signal processing software.
During his session at GTC 2019, Armour talked about AstroAccelerate, a GPU enabled software package that uses CUDA and NVIDIA GPUs to achieve real-time processing of radio-astronomy data. He stated that “The massive computational power of modern day GPUs allows code to perform algorithms such as de-dispersion, single pulse searching and Fourier Domain Acceleration Searching in real-time on very large data-sets which are comparable to those which will be produced by next generation radio-telescopes such as the SKA.”
Watch the video: https://wp.me/p3RLHQ-kBv
Learn more: https://www.skatelescope.org/the-ska-project/
and
https://www.nvidia.com/en-us/gtc/
Sign up for our insideHPC Newsletter: http://insidehpc.com/newsletter
This course gives keys to understand the SAR image and specificities: geometry, speckle, penetration capabilities, layovers, multipath, dielectric properties.
Advanced modes: polarimetry, interferomety and POLINSAR are also presented.
This is a book review of book 'Global Positioning System' by Sh Akashdeep. presentation talks about development, functioning and application of GPS system in world.
The global positioning system is a spaced based satelite navigation system that provides location time information in all weather conditions , anywhere on or near the earth where there is an unobstructed line of sight to four or more GPS satellites.
Developed and maintained by the US Department of Defense (DOD)
A ~25 slide presentation that explains the underlying principles and some applications of InSAR, with a particular focus on the measurement of deformation due to earthquakes. The presentation could be used in a lecture or lab setting, or provided to students for review out of class. The slides are annotated with additional background information designed to assist instructors.
www.modusrobotics.com.
Hope you like this presentation about LiDAR flight plannings. Contact Modus Robotics if you've more questions about Flight Panning, Point Density, and Swath Panning etc.
Modus Robotics helps various organizations to collect, analyze and transform data into Actionable Information for Rapid Decision Making.
Radar image and it's acquisition have been described shortly here. Image processing methods like applying filters have been described briefly. The last part of the presentation contains some application of radar images.
AstroAccelerate - GPU Accelerated Signal Processing on the Path to the Square...inside-BigData.com
In this deck from the GPU Technology Conference, Wes Armour from the Oxford eResearch Centre discusses the role of GPUs in processing large amounts of astronomical data collected by the Square Kilometre Array and how CUDA is the best suited option for their signal processing software.
During his session at GTC 2019, Armour talked about AstroAccelerate, a GPU enabled software package that uses CUDA and NVIDIA GPUs to achieve real-time processing of radio-astronomy data. He stated that “The massive computational power of modern day GPUs allows code to perform algorithms such as de-dispersion, single pulse searching and Fourier Domain Acceleration Searching in real-time on very large data-sets which are comparable to those which will be produced by next generation radio-telescopes such as the SKA.”
Watch the video: https://wp.me/p3RLHQ-kBv
Learn more: https://www.skatelescope.org/the-ska-project/
and
https://www.nvidia.com/en-us/gtc/
Sign up for our insideHPC Newsletter: http://insidehpc.com/newsletter
This course gives keys to understand the SAR image and specificities: geometry, speckle, penetration capabilities, layovers, multipath, dielectric properties.
Advanced modes: polarimetry, interferomety and POLINSAR are also presented.
This is a book review of book 'Global Positioning System' by Sh Akashdeep. presentation talks about development, functioning and application of GPS system in world.
The global positioning system is a spaced based satelite navigation system that provides location time information in all weather conditions , anywhere on or near the earth where there is an unobstructed line of sight to four or more GPS satellites.
Developed and maintained by the US Department of Defense (DOD)
A ~25 slide presentation that explains the underlying principles and some applications of InSAR, with a particular focus on the measurement of deformation due to earthquakes. The presentation could be used in a lecture or lab setting, or provided to students for review out of class. The slides are annotated with additional background information designed to assist instructors.
www.modusrobotics.com.
Hope you like this presentation about LiDAR flight plannings. Contact Modus Robotics if you've more questions about Flight Panning, Point Density, and Swath Panning etc.
Modus Robotics helps various organizations to collect, analyze and transform data into Actionable Information for Rapid Decision Making.
Remote Sensing Data Acquisition,Scanning/Imaging systemsdaniyal rustam
full of concepts about RS data acquisition scanning and imaging systems. Best for students of remote sensing. in this presentation we briefly explained the concept of scanning in remote sensing.
Differential Global Positioning System (DGPS) is an enhancement to Global Positioning System that provides improved location accuracy, from the
15-meter nominal GPS accuracy to about 10 cm in case of the best implementations. Differential Global Positioning System (DGPS) is a method of providing differential corrections to a Global Positioning System (GPS) receiver in order to improve the accuracy of the navigation solution. DGPS corrections originate from a reference station at a known location. The receivers in these reference stations can estimate errors in the GPS because, unlike the general population of GPS receivers, they have an accurate knowledge of their position.
DGPS uses a network of fixed, ground-based reference stations to broadcast the difference between the positions indicated by the GPS (satellite) systems and the known fixed positions. These stations broadcast the difference between the measured satellite pseudoranges and actual (internally computed) pseudoranges, and receiver stations may correct their pseudoranges by the same amount. The digital correction signal is typically broadcast locally over ground-based transmitters of shorter range.
Differential Global Positioning System (DGPS) is an enhancement to Global Positioning System that provides improved location accuracy, from the
15-meter nominal GPS accuracy to about 10 cm in case of the best implementations. Differential Global Positioning System (DGPS) is a method of providing differential corrections to a Global Positioning System (GPS) receiver in order to improve the accuracy of the navigation solution. DGPS corrections originate from a reference station at a known location. The receivers in these reference stations can estimate errors in the GPS because, unlike the general population of GPS receivers, they have an accurate knowledge of their position.
DGPS uses a network of fixed, ground-based reference stations to broadcast the difference between the positions indicated by the GPS (satellite) systems and the known fixed positions. These stations broadcast the difference between the measured satellite pseudoranges and actual (internally computed) pseudoranges, and receiver stations may correct their pseudoranges by the same amount. The digital correction signal is typically broadcast locally over ground-based transmitters of shorter range.
Lecture prepared by Mark Billinghurst on Augmented Reality tracking. Taught on October 18th 2016 by Dr. Gun Lee as part of the COMP 4010 VR class at the University of South Australia.
3. • Transmits laser signals and measures the reflected light to create
3D point clouds.
• Wavelength is usually in the infrared (~1550nm) or green (532nm)
spectrum
How a Lidar Instrument Works
4. TLS Instrument and Survey Parameters
• Spot size (range, divergence)
• Spot spacing (range, angular resolution)
• Spot density (range, angle, number of setups)
• Angle of incidence (spot shape, intensity, range)
• Targets
• Edge effects
• Registration
• First return, last return, “other”
• Shadows, field of view
• Scan object characteristics (albedo, color, texture)
• Area of interest
8. Rule of thumb: scan at least 1/10 of
the “wavelength” of the object you
wish to image.
TLS Instrument and Survey Parameters
Angular Step
9. • Shot spacing varies as a function of range to
target.
TLS Instrument and Survey Parameters
Shot Spacing/Sample Density
• Choose angular scan resolution to optimize
sample density.
10. • Choose scan positions to minimize occluded
(shadowed or hidden) geometries.
overhang
TLS Instrument and Survey Parameters
Scan Position
11. • Reflective objects that serve as reference points for scans.
• Same targets must be common between scan positions.
• Use at least 5 reference targets to register scan positions
(the more the better).
• Different shapes and colors serve different functions
(images not to scale)
TLS Instrument and Survey Parameters
Targets
13. • Spot size (range, divergence)
• Spot spacing (range, angular resolution)
• Spot density (range, angle, number of setups)
• Angle of incidence (spot shape, intensity, range)
• Targets
• Edge effects
• Registration
• First return, last return, “other”
• Shadows, field of view
• Scan object characteristics (albedo, color, texture)
• Area of interest
TLS Instrument and Survey Parameters
14. Before heading out into the field
• GPS network – identify base stations, benchmarks, and make sure they are
operational!
• Understand field site, anticipate challenges you may encounter (complex
landscape, is power available in evenings, etc.)
• Give equipment a test run.
TLS Survey Workflow
16. Will this fit in your
vehicle?
Who will carry it?
Basic Field Kit
17. TLS Survey Workflow
At the field site
• Take a walk around the field site before setting anything up. Identify scan
positions, target positions, and your GPS base station.
• Set up targets and start GPS data collection. This will take one to two hours.
• Only now are you ready to start scanning!
• Scan Position 1
• 360-deg Panorama scan + Image acquisition if desired.
• Target finescan
• Area of interest finescan
• Scan Position 2 and beyond
• Same as Scan Position 1, but after the target finescan you will find
corresponding points with previous scans and co-register scan positions.
19. Capture all of the information
you can!
• Draw a sketch
• Target arrangement?
• Scan positions?
• GPS locations?
• Which targets? Offsets?
• Atmospheric conditions
• Who are you working with
• What are you scanning
• Important notes: Professor
tripped over the tripod…
Metadata
20. • Reminders – use at least five targets. That is, every scan position should
see at least five targets, every target should be seen by at least two scan
positions.
• The more targets common to all scan positions, the better.
TLS Survey Workflow
Standard tie-point workflow
25. • Constellation of thirty-one satellites that each house an
atomic clock.
• Precise time information is sent to a receiver on Earth.
• A minimum of four satellites in sky view is needed to obtain
a coordinate.
X, Y, Z
Global Positioning System
26. Uses known reference points (base stations) on the
Earth to provide corrections for unknown points.
• Advantage is cm to sub-cm
precision!
• Base station and unknown points
must share same occupation time.
• Base stations and unknown points
must “see” same errors (same sky
view). Practical limit is 100km.
• Vertical precision will always be ~2x
less precise than horizontal
precision.
Global Positioning System
29. • SOCS – Scanner Own Coordinate System
• Each scan position has origin at scanner
location
• PRCS – PRoject Coordinate System
• Local coordinate system for entire project
• GLCS – GLobal Coordinate System
• ECEF, UTM, State Plane, etc.
Adding GPS to a TLS Survey
30. • 3D “point cloud” of discrete locations derived from range
and orientation of scanner for each laser pulse.
• XYZ position in Cartesian coordinates plus associated
point attributes: intensity, RGB, etc.
• 3D point clouds are the basis for subsequent analysis and
used to create CAD or GIS models.
Collected Data
Point Cloud
32. Data volume can be a problem:
• Technology outpaces most software for
data processing & management.
• Just because you can, doesn’t mean you
should
• Science application should define data
collection.
Data Considerations