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and baseline information or locating indistinct ground control
points (GCPs) in InSAR processing. If a reference DEM is
available, registration and alignment can make an InSAR DEM
with good accuracy, comparable to applying GCPs in InSAR
processing. In this experiment, the InSAR DEM refined by
registering and aligning to a reference DEM turned out better
accuracy than only applying GCPs into InSAR processing.
SRTM 3 Arc Seconds (90 meter) DEM data is a good public
accessible reference DEM to register and align a 15-30 meter
(post spacing) InSAR DEM, since SRTM 3 Arc Seconds DEM
data is available globally, except in polar regions.
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