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Purpose

 

ALOS PALSAR data provided from JAXA within the Kyoto and Carbon (K&C) Initiative must be imported into the SARscape Data Format for further processing.

 

Technical Note

 

Doppler file

These data are provided with several tens of polynomial, which are used depending on the different azimuth position. The "Doppler file" is considered to apply the most appropriate Doppler polynomial depending on the variable azimuth position within the processed scene.

 

Azimuth Shift        

Processing testing performed on a large amount of such products shown that several data are affected by a certain constant shift in azimuth direction. In order to overcome this problem, which affects the geocoding accuracy, the shift can be measured and taken into account during the data import. Actually a first processing iteration - using nominal geocoding parameters - is needed in order to check if a geolocation error exists and to eventually measure its magnitude; afterward the data will be imported again by specifying the previously measured azimuth shift (in meters).

 

Since these products are already provided as Gamma Nought, any further data calibration/normalization cannot be performed.  

 

Supported Products

 

Wide Swath (i.e. ScanSAR) and Stripmap products, in slant range geometry, are supported (JAXA format).

 

Input Files

 

Input file

Intensity image. This file is mandatory.

 

Input Parameters file

File name of the acquisition parameters (facter_m.dat). This file is mandatory.

 

Input Orbit file

File name of the orbital data (dataf_m.dat). This file is mandatory.

 

Input Doppler file

File name containing the Doppler polynomial (fdfdd.dat). This file is optional. If it is not used a single average polynomial, which is provided in the "Parameter file", is applied for the whole scene.

 

Parameters - Principal Parameters

 

Specify the acquisition mode (i.e. Stripmap or ScanSAR) of the data to import.

 

Azimuth Shift        

Shift offset (in meters) to be applied, in azimuth direction, during the data geocoding.

 

Fill dummy during import

Possibility to replace invalid backscatter pixel values with random low values.

 

Parameters - Global

 

It brings to the general section of the Preferences specific 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.

 

Output Files

 

Output file

Output file name of the imported data. This file is mandatory.

 

_pwr        

Slant range Intensity image and associated header files (.sml, .hdr).

 

_pwr_gcp1.xml        

Xml file containing the Ground Control Point for the image geocoding.

 

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.