BinaryGTThresholdRaster Task

This task creates a new raster where values above a specified threshold are set to 1 and all other values are set to 0. The resulting raster has a DATA_TYPE of Byte.

The virtual raster associated with this task is ENVIBinaryGTThresholdRaster.

Example

; Start the application

e = ENVI()

; Open an input file

File = Filepath('qb_boulder_msi', Subdir=['data'], $

Root_Dir=e.Root_Dir)

Raster = e.OpenRaster(File)

; Get the task from the catalog of ENVITasks

Task = ENVITask('BinaryGTThresholdRaster')

; Define inputs

Task.INPUT_RASTER = Raster

Task.THRESHOLD = [250., 360., 270., 360.]

; Run the task

Task.Execute

; Add the output to the Data Manager

e.Data.Add, Task.OUTPUT_RASTER

; Display the result

View = e.GetView()

Layer = View.CreateLayer(Task.Output_Raster)

Layer.QUICK_STRETCH = 'equalization'

Syntax

Result = ENVITask('BinaryGTThresholdRaster')

Input parameters (Set, Get): INPUT_RASTER, OUTPUT_RASTER_URI, THRESHOLD

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 the raster to threshold.

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.