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The DEM reference phase is computed in two steps:

First, the DEM is radarcoded to the coordinate systems of the master image. Per DEM point the master coordinate (real valued) and the computed reference phase is saved to a file.

Second, the reference phase is 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

Leijen 2009-04-14