1. Introduction
The capability to obtain quality DEM data over large
areas is important for Earth science studies. The SRTM
instrument was the first fixed baseline single-pass spaceborne
dual frequency (C-band and X-band) interferometric
SAR (http://www.jpl.nasa.gov/srtm). The dual antenna system
of SRTM provides the best elevation data ever available
at a global scale. Both airborne and space based lidar
systems are emerging as high precision topographic mapping
tools (Blair, Rabine, & Hofton, 1999; Hofton, Rocchio,
Blair, & Dubayah, 2002) as well as effective systems for the
estimation of surface geology and vegetation biomass
1. IntroductionThe capability to obtain quality DEM data over largeareas is important for Earth science studies. The SRTMinstrument was the first fixed baseline single-pass spacebornedual frequency (C-band and X-band) interferometricSAR (http://www.jpl.nasa.gov/srtm). The dual antenna systemof SRTM provides the best elevation data ever availableat a global scale. Both airborne and space based lidarsystems are emerging as high precision topographic mappingtools (Blair, Rabine, & Hofton, 1999; Hofton, Rocchio,Blair, & Dubayah, 2002) as well as effective systems for theestimation of surface geology and vegetation biomass
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