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Purpose

 

Standard orbits, which are provided with ERS-1/2 and ENVISAT ASAR products, can be updated using precise ones.

 

Technical Note

 

Precise orbits, which are made available through the Delft University, can be downloaded and used to update the relevant information in the SARscape header file (a copy of the original header files is automatically saved on disk). This procedure is especially useful for interferometric processing purposes, where an improvement of just 1 meter or less - in terms orbital parameters accuracy - can dramatically improve the quality of the final processing results.

 

A two step procedure has to be followed:

1.Create a folder named "Arclist" containing three sub-folders which, depending on the acquisition sensor, are:

- ERS1

- ERS2

- ENVISAT

 

2.Download the Arclist  file as well as the orbital files (ODR) from the Delft University WEB site and store them in the relevant sub-folder (ERS1, ERS2 or ENVISAT).

 

Orbits (ODR) and Arclist, which can be downloaded from the closest FTP server (e.g. the French one for Europe), must be stored in the same folder.

 

If the required orbital file name is in the Arclist, but the relevant orbital data (ODR) has not been downloaded, an error appears with the name of the missing orbital data (ODR).

 

It must be noted that some ERS orbital data can be not available in the Delft data base; a more comprehensive set is available in the DLR data base.

 

Input Files

 

Arclist file

Path of the input folder containing the relevant Arclist and orbital data. This file is mandatory.

 

File to Update

Input file name of the SAR data (e.g. _slc) to update. This file is mandatory. The data must have been previously imported.

 

Output Files

 

_OLD...

Copy of the header files (.sml, .hdr) containing the old - not updated - orbital parameters.

 

Details specific to the Units of Measure and Nomenclature of the output products can be found in the Data Format section.

 

General Functions

 

Exec

The processing step is executed.

 

Store Batch        

The processing step is stored in the batch list. The Batch Browser button allows to load the batch processing list.

 

Close        

The window will be closed.

 

Help

Specific help document section.

 

 

Specific Function(s)

 

None.

 

See Also

 

Task, SARscapeBatch object, SARscapeBatch script example

 

References

 

None.