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. 

There are two mistakes I made when I was first trying this.

 1- My list of "dor_vor" files had "./" characters in the beginning and that caused the dorvor_to_odr.m script to fail.

2- I was using the older version of getorb (2.3.1) instead of the latest (2.3.2) which reads the generated ODR files fine but raises an error flag causing DORIS to ignore orbits. 

Trying to troubleshoot I modified scripts, getorb etc... Below is the full story for interested parties. ;)

The changes are very small but were required to run the code. Freek's script uses the filename to obtain the date for the orbits, and in my case the filenames were slightly off. Therefore I needed to adjust the script to get the correct part of the filename.

After changing the matlab code I noticed that my input file was wrong. It had './' characters in front of the filenames.  Anyway, I wanted to write about it here, so that I don't forget it, and in case others face a similar problem.  But again there is nothing wrong with the original script. You just have to be careful about the input file.

modified dorvor_to_odr_batu.m

On another (MORE IMPORTANT) note make sure you are using the latest getorb (2.3.2 or later). Earlier versions read the ODR files correctly but raise "-1" flag (outside precise part of the orbit).