Hello all,
To present myself, I’m a new user of SNAP. I’m an intern in computer sciences and I had no previous knowledge of interferometry 1 month ago.
I want to generate a DEM but I’ve got many problems :
First, I use 2 SLC with the following processing chain :
Split -> Apply Orbit File -> Back Geocoding -> Interferogram -> Deburst -> Goldstein -> Subset -> Export Snaphu -> Unwrap the Phase -> Import Snaphu.
And when I try to use the tool : Phase to Elevation to generate my DEM, I have a NullPointerException with SRTM 3sec (Autodownload). Then I use SRTM 1sec(Autodownload) and it works, but I get an offset at sea level and thus on the rest…
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How can I set my 0 altitude to sea level ?
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Why do I get NullPointerException if I try SRTM 3sec ?
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Phase to Height always crashes while Phase to Elevation seems to work. Why does it crash and what is the difference between this two processes ?
Thanks for your help.