Create Digital Elevation Models (DEMS) and land
displacement map to understand the changing topography
of an area.
From the orbital parameters of two SLC datasets, there are a series of steps that use the phase information to process data. Interim steps include: the generation of an interferogram; creation of a coherence map; DEM flattening; phase to height conversion and geocoding; and, phase to displacement conversion and geocoding. This process culminates in the creation of either a DEM or a displacement map.
ENVI SARscape processes interferometric SAR data (2-pass interferometry, InSAR) to generate DEMs. During this process, an interim step involves the generation of a coherence map. Highly accurate DEMs can be generated using the interferometric module.
Exploit differential SAR interferometry techniques to analyze stacks of SAR data to extract small deformations over large areas, this is particularly useful in rural areas where few point targets exist but where large, correlated displacements occur over natural targets. These natural targets would include land-displacement from an earthquake or landslide.
Detect very small displacements (mm scale) using very stable, man-made reflectors. This is particularly suited for urban areas with many point targets, and would include examples such as subsidence occurring from foundation shifts of buildings or the detection of cracks in a dam.
ENVI SARscape includes inversion algorithms and analytical models to retrieve the parameters of geophysical sources underlying and responsible for the observed displacement. These tools can be used for modeling earthquakes, volcanoes, and other geophysical phenomena.
ENVI SARscape processes differential interferometric SAR data (n-pass interferometry, DInSAR) to create land displacement and deformation maps. The ability to detect terrain displacement is unique to SAR data. Some applications would include identifying areas where vehicles may have been passing through an area, or looking at disturbances around a building to detect new activities. Another use of a land displacement map would be tracking land shift after an earthquake or landslide.
ENVI SARscape integrates point-based and area-based techniques to process interferometric stacks of SAR images to create highly accurate displacement maps. This combined approach analyzes deformation phenomena affecting both natural features and man-made features related to natural or man-induced phenomena like volcanic or seismic activity, landslides, subsidence, building failures and more.
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