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Purpose

 

An 8 bit Tiff image can be obtained from any SARscape product. This tool is mostly intended to optimize the scaling of the original histogram for image visualization purposes. If used for generating the Tiff image of an interferogram, the output tiff will display the interferometric fringes in combination with the amplitude image, with the classical color scale. In this case the 8 bit tiff is composed by 4 bits assigned to the phase and 4 bits assigned to the amplitude. The 4 bit of the phase defines the chrominance while the 4 bit of amplitude defines the luminance of the interferogram.

 

Technical Note

The histogram scaling is performed using the following formula:

output value = 1+(254 .  0.33333 . Scale . input valueexponent ) / Mean value

 

The scale factor can be tuned in order to optimize the visualisation rendering. By setting the flag "Use Entered Values Only" the original pixel values are stretched only on the basis of the figures provided in the "Scale" and "Exponent" boxes; in such case the "Mean Value" term becomes equal to 1.

 

All images geocoded to the GEO-GLOBAL reference system (LAT/LONG co-ordinates) can be automatically displayed into the Google Earth environment by double clicking on the output kml file.

 

Input Files

 

Input file list

Input file name(s) of the data to be processed. This file is mandatory.

 

Parameters - principal Parameters

 

Scale        

Changing this value affects the output image brightness: the higher this value the brighter the image.

 

Exponent        

An exponential scaling factor is applied. Values higher than 1 enable to optimize the stretch of high pixel values (bright areas); values lower than 1 enable to optimize the stretch of low pixel values (dark areas).

 

Use Entered Values Only

The input values are scaled only on the basis of the specified "Scale" and "Exponent".

 

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.

 

Output Files

 

Output file list

Output file name(s) of the extracted data. This file is mandatory.

 

_ql.tif        

Tiff image and corresponding header file (.sml).

 

.kml (only for images geocoded in GEO-GLOBAL)

ASCII file containing the information to visualize the Tiff image in Google Earth.

 

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.