This is a short tutorial on: "How to download Orbit files for ENVISAT or ERS from ESA"

Orbit files are basicaly text files with the exact position and velocity of the satellite. They are used for varius SAR processing steps such as, Terrain correction, InSAR or CCD. The parameters are recorded by the DORIS instrument on ENVISAT and you can download them from the ESA FTP.

There are three types of Orbitfiles:

1.) The theoretical satellite orbit, these information are already in the metadata.

2.) POR is a more accurate and these are availiable 3-5 days after image aquisition

3.) VOR is the most accurate format, that is used for scientific applications (availiable 4-5 weeks after acquisition).

Use an FTP client to download the POR files and store them in the "Orbits" directory of your "C:/NestData" directory (local directory on your computer). Make sure that the files do not have any file extension like *.txt


All files are stored in subfolders like C:\NestData\Orbits\Doris\por\201001 (with date as a folder) or C:\NestData\Orbits\Doris\vor\YYYYMM

NEST will find the information and write to the meta data by "Apply Orbit file" -Operator.

-- MichaelJendryke - 11-Mar-2010

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Topic revision: r2 - 2010-05-05 - unknown
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