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The DEM-assisted coregistration is estimated in two steps:

First, the DEM is radarcoded to the coordinate systems of the master and slave image. Per DEM point the master coordinate and the offset between master and slave is saved to a file. Both the master coordinates and offsets are real valued.

Second, the offsets are interpolated to the integer grid of master coordinates. A linear interpolation based on a Delaunay triangulation is used. The software package Triangle for the Delaunay triangulation is kindly made available by Jonathan Shewchuk [16,17], see also

The finally optained master-slave offsets per master pixel are saved to a file and used in the RESAMPLE step to resample the slave image to the master geometry.

Leijen 2009-04-14