RankStrengthTexture Task

This task computes rank-based strength and label texture metrics on a raster. These metrics are useful for feature extraction. See Rank-Strength-Texture Algorithm Background for details on the algorithm that ENVI uses.

The virtual raster associated with this task is ENVIRankStrengthTextureRaster.

Example

; Start the application

e = ENVI()

; Open an input file

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

  Root_Dir=e.Root_Dir)

Raster = e.OpenRaster(File)

; Get the task from the catalog of ENVITasks

Task = ENVITask('RankStrengthTexture')

; 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('RankStrengthTexture')

Input properties (Set, Get): INPUT_RASTER, OUTPUT_RASTER_URI

Output properties (Get only): OUTPUT_RASTER

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

Methods

This task inherits the following methods from ENVITask:

Properties

This task inherits the following properties from ENVITask:

COMMUTE_ON_DOWNSAMPLE

INPUT_RASTER (required)

Specify the input ENVIRaster. This routine accepts an image with any number of bands.

OUTPUT_RASTER

This is a reference to the output raster of filetype ENVI.

The output raster will contain a Strength and Label band for each input band, for example:

Strength (Band 1)
Label (Band 1)
Strength (Band 2)
Label (Band 2)

See Rank-Strength-Texture Algorithm Background for descriptions of the Strength and Label bands.

OUTPUT_RASTER_URI (optional)

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

If you set this property to an asterisk symbol (*), the output raster will be virtual and not written to disk.
If you do not specify this property, or set it to an exclamation symbol (!), a temporary file will be created.

Version History

ENVI 5.4	Introduced
ENVI 5.5	OUTPUT_RASTER_URI now supports '*', which allows OUTPUT_RASTER to be virtual output.

API Version

4.2