SAR Analysis Made Easy with SARscape 5.1 All rights reserved. ENVI, IDL and Jagwire are trademarks of Exelis, Inc. All other marks are the property of their respective owners. 2014, Exelis Visual Information Solutions, Inc
What is Synthetic Aperture Radar (SAR)? SAR is a side looking radar system that generates a high resolution image of the Earth s surface for remote sensing applications. Main features of radar: > Microwaves (1 mm to 1 m wavelength, 0.3 to 300 GHz frequency) > Different wavelengths are useful for different purposes (bands: X, C, S, L, P) > Has a unique polarization component (helps distinguish the structure of a surface) > The longer the wavelength, the more radar can penetrate rain, clouds and even the ground West Coast of Italy. Courtesy of ESA
Optical versus Synthetic Aperture Radar (SAR) visible to infrared active microwave
Benefits of SAR SAR can be used as a stand alone data source, or as an enhancement to optical or other types of data. Benefits of using Radar: > Controllable source of illumination sees through clouds, smoke, and at night > Images can be high resolution 1 to 10 meters or better > Different features can be discriminated compared to visible iibl sensors uses surface features like roughness > RADAR excels at detecting unique surface features such as: > Ice, ocean waves > Soil moisture, vegetation mass > Man made object like buildings West Coast of Italy. Courtesy of ESA > Geological structures
Land Cover Classification High vegetation - forest Medium vegetation - forest Short vegetation/very rough soil Medium-strong scatterer - structures/man made construction Very strong scatterer - rock/urban Very rough hard surface Short vegetation mixed with water - Wetland Rough unvegetated surface - water/bare soil/road Smooth unvegetated surface - water/bare soil/road Calm water Smooth bare soil/wet bare soil Rough soil Very rough soil Russia, ALOS PALSAR-1, 15 meter - October 2009
Monitoring Cleared Areas Over Time ALOS PALSAR-1, 15m before 2007 2007-2008 2008-2009
Crop Monitoring No data Before ploughing Radarsat-1 Fine Beam 04 Nov 2003 21 Nov 2003 28 Nov 2003 After ploughing Weeds emergence Weeds removal/frost Plants just emerged Plant growing 1 Plant growing 2 Flowering Full plant development Plant drying Full maturiry
DEM Generation with Interferometry DEM based on TerraSAR X StripMap, Bolivia. TerraSAR X data, Infoterra
Detection of Terrain Displacements Building Movement 11 days 22 days 33 days 44 days 55 days 66 days Filtered interferograms of a building in Barcelona, TerraSAR X StripMap, 1 fringe ~1.55 cm displacement. TerraSAR X data, Infoterra
SARscape 5.1 > Improved Workflows > IncreasinglyAccurate Algorithms > Expanded Sensor Support > Flexibility
SAR workflows > Guided procedures to generate standard dproducts > End to end > Automatic handling of file names > Simple collection of key parameters > Forward backward possibility
Available workflows > Amplitude time series generation > Coherence Change Detection > Coherence RGB > InSAR DEM > TanDEM X bistaticdem > Stereo DEM > DInSAR displacement map > Multi Aperture Interferometry > Amplitude tracking
Amplitude time series generation
Coherence Change Detection
Coherence RGB
InSAR DEM Generation
TanDEM X Bistatic DEM
Radargrammetry / Stereo DEM
DInSAR displacement map
Multi Aperture Interferometry
Amplitude tracking
New standard, persistent user interface Until SARscape 5.0 From SARscape 5.1 on
Guided output names
Simplified access to GCP definition
Simplified access to DEM import & download
Standard vs. expert use
Extended time series analyzers
Support of internationalization [I18N]
Parallel / GPU platform selection
Support of new sensors > RiSAT 1 > Kompsat 5 > Sentinel 1 (preliminary) > ALOS 2 (preliminary)
Summary SAR is a useful remotely sensed data type that provides unique insight into geospatial questions The latest release of ENVI SARscape makes it easier for users to extract information from SAR data. Main features of SARscape 5.1: > New SAR workflows within a standardized interface > Support for more SAR sensors > Improved user experience > Guided output names, standard vs. expert settings, simplified access to GCP definition, DEM import and download, an extended time series analyzer, internationalization, and GPU support > Look for more great advancements in the future!
All rights reserved. ENVI, IDL and Jagwire are trademarks of Exelis, Inc. All other marks are the property of their respective owners. 2014, Exelis Visual Information Solutions, Inc