Synthetic Aperture Radar Frequently Asked Questions (SAR FAQ)

In this article I'll list some of the questions that either I came across or people ask me repeatedly about SAR.

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Gamma Readfiles for Doris

In our group sometimes we use SAR images focused using GAMMA MSP. I wrote a script to read gamma parameter files and generate the output for DORIS readfiles step.

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Modified construct_dem.sh for downloading SRTM data

There are no FTP sites hosting the SRTM data anymore, which caused problems with available scripts. If you like you can read one of my previous articles about this: SRTM FTP Site Changed. I managed to modify the construct_dem.sh script which is a part of Doris.

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DOR_VOR to ODR Conversion

The Delft ODR orbits for Envisat (ftp://dutlru2.lr.tudelft.nl/pub/orbits/ODR.ENVISAT1/eigen-cg03c/arclist) end sometime beginning of 2008. Therefore we need other orbits to process new Envisat scenes with DORIS. It is possible to use CNES precise orbits (DOR_VOR) files in Doris to process Envisat Interferograms.  These need to be converted to ODR files as a first step. Freek van Leijen from TU-Delft has written a matlab script file (dorvor_to_odr.m) for the conversion.

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SRTM FTP Site Changed

It seems like the Shuttle Radar Topography Mission (SRTM) data site is not available at NASA anymore. I used to use that FTP site for generating DEMs for my study areas.

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