<< Click to Display Table of Contents >> Navigation:  »No topics above this level« Basic - Intensity Processing - Geocoding - Map to SAR Image Conversion

Purpose

 

The usual way is to convert – based on a range-Doppler approach – slant or ground range SAR data into a cartographic reference system. However, in some cases the inverse transform is requested, in particular when data – for instance Digital Elevation Model or Optical image – available in a cartographic reference system should be projected into the slant or ground range SAR geometry; this is the purpose of this functionality.  

 

Technical Note

In case of precise orbits and accurately "Geocoded file", this process is run in a fully automatic way. However, in case of inaccuracy in the satellite orbits or in the "Geocoded file" geolocation, a Ground Control Point is required to correct the SAR data with respect to the "Geocoded file". The Ground Control Point must be identified on the "Slant/Ground range file". The GCP is not needed if the manual or the automatic correction procedure has been previously executed.

It is useful to highlight that the conversion in SAR coordinates of an Optical image, needs to be done for each channel separately, then the final image is generated through the tool Generate Color Composite (General Tools/Data Export/Generate Color Composite).

 

 

Input Files

 

Geocoded file

File name of the data (SAR, Optical, image, Digital Elevation Model, etc.) in the cartographic reference system. This file is mandatory.

 

Slant/Ground range file

File name of the slant or ground range data, onto which the geocoded file shall be converted. This image must overlap the geocoded one. This file is mandatory.

 

Digital Elevation Model file

Digital Elevation  Model file name. This should be referred to the ellipsoid. This file is optional.

 

Optional Files

 

Geometry GCP file

Either a previously created Ground Control Point file (.xml) is loaded (Load GCP file) or the interface to create a new Ground Control Point file is automatically loaded (Create GCP file, refer to the "Tools>Generate Ground Control Point" for details). This file is optional.

 

Parameters - Principal Parameters

 

Reference Height

In case that the Digital Elevation Model is not used, a constant ellipsoidal height must be provided. Default Reference Height is 0.

 

Parameters - Global

 

It brings to the general section of the Preferences parameters. Any modified value will be used and stored for further processing sessions.

 

Parameters - Other Parameters

 

It brings to the general section of the Preferences parameters. Any modified value will be used and stored for further processing sessions.

 

Last Value

This flag has to be set in case the integer number value in the MAP data want to be kept. This is useful in particular for classification maps

 

Output Files

 

Output file

Output file name of the slant or ground range projected data. This file is mandatory.

 

_rsp

Data in slant or ground range SAR geometry and associated header files (.hdr, .sml).

 

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.

 

References

 

Frei U., C. Graf, and E. Meier: "Cartographic Reference Systems, SAR Geocoding". Data and System, Wichmann Verlag, 1993.

 

Meier E., Frei U., and D. Nuesch: "Precise Terrain Corrected Geocoded Images, SAR Geocoding". Data and System, Wichmann Verlag, 1993.