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Use of DEM-driven SAR simulator to study stereo-pair generation

Use a SAR simulator to collect imagery for stereo-pair generation, analyzing parallaxes, depth conversion, and layover control for accurate DEM modeling. Invert histograms for consistent illumination. Modify look angles for layover control. Enhance study with increased look angle from 23 to 65 degrees.

sonjapeterson
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Use of DEM-driven SAR simulator to study stereo-pair generation

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  1. Use of DEM-driven SAR simulator to study stereo-pair generation

  2. Collect imagery along parallel flight lines, from left and right SARView from east SARView from west Layover / relief displacement is toward the sensor Interchange left and right Layover / relief displacement now yields parallaxes that our viewing converts into depth Invert histogram on one side only Geometry correct for stereo, but left / right illumination is not consistent, so we invert the histogram on one side. Stereo view, or 1D correlation / matching for DEM generation

  3. Controlling the layover or vertical exaggeration in the stereo model is done by modifying the “look angle” or “off-nadir angle”. Small look angle (narrow base) yields large layover. Large look angle (wide base) yields small layover. In the limit, horizontal viewing produces zero layover, though lots of occlusions. Narrow base = large layover Wide base = small layover (opposite of optical imagery!) For the following example we increased nominal 23 deg look angle to 65 deg

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