Abstract
Using Interferometric Synthetic Aperture Radar (InSAR) technology, Intermap’s STAR-3i provides a new generation of digital elevation models (DEMs) and orthorectified radar image (ORRI) maps. Because the Global Positioning System (GPS) is used as the position reference for STAR-3i, the terrain data provided by STAR-3i are referenced to an ellipsoid. An accurate geoid is required to create a sea level referenced DEM. For this purpose, Intermap has developed a new airborne gravity system (AGS). It is based on the STAR-3i navigation system consisting of differential GPS (DGPS), the strapdown inertial navigational system (INS), and the STAR-3i acquisition system.
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