RadarBackscatter Task

This task calibrates a radar amplitude raster to sigma nought backscatter, in decibels. It currently only works with ALOS-1 or ALOS-2 PALSAR Level-1.5, 2.5, and 3.1 data.

The virtual raster associated with this task is ENVIRadarBackscatterRaster.

Example

This example shows how to calibrate an ALOS-2 PALSAR Level-1.5 ScanSAR product to sigma nought backscatter:

; Start the application

e = ENVI()

; Open an input file

File = 'LED-ALOS2404053250-200622-WBDL1.5GUD'

Raster = e.OpenRaster(File)

; Get the task from the catalog of ENVITasks

Task = ENVITask('RadarBackscatter')

; Define inputs

Task.INPUT_RASTER = Raster

; Run the task

Task.Execute

; Get the collection of data objects currently available in the Data Manager

DataColl = e.Data

; Add the output to the Data Manager

DataColl.Add, Task.OUTPUT_RASTER

; Display the result

View = e.GetView()

Layer = View.CreateLayer(Task.OUTPUT_RASTER)

Syntax

Result = ENVITask('RadarBackscatter')

Input parameters (Set, Get): INPUT_RASTER, OUTPUT_RASTER_URI

Output parameters (Get only): OUTPUT_RASTER

Parameters marked as "Set" are those that you can set to specific values. You can also retrieve their current values any time. Parameters marked as "Get" are those whose values you can retrieve but not set.

Input Parameters

INPUT_RASTER (required)

Specify a radar amplitude raster on which to apply the backscatter calibration.

OUTPUT_RASTER_URI (optional)

Specify a string with the fully qualified filename and path to export the associated OUTPUT_RASTER.

If you set this parameter to an asterisk symbol (*), the output raster will be virtual and not written to disk.
If you do not specify this parameter, or set it to an exclamation symbol (!), a temporary file will be created.
If you set it to the hash symbol (#), ENVI creates a file in the temporary directory, but this file will not be deleted when ENVI closes.