ClassificationToPolygonROI Task

This task creates polygon regions of interest (ROIs) from a classification raster.

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)

; Create a classification ENVIRaster

ClassTask = ENVITask('ISODATAClassification')

ClassTask.INPUT_RASTER = Raster

ClassTask.Execute

; Convert the classification pixels to polygon ROIs

Task = ENVITask('ClassificationToPolygonROI')

Task.INPUT_RASTER = ClassTask.OUTPUT_RASTER

Task.Execute

; Display the ROIs

View = e.GetView()

Layer = view.CreateLayer(Raster)

rois = Task.OUTPUT_ROI

roiLayers = OBJARR(N_ELEMENTS(rois))

FOR i=0, N_ELEMENTS(rois)-1 DO roiLayers[i] = layer.AddROI(rois[i])

Syntax

Result = ENVITask('ClassificationToPolygonROI')

Input properties (Set, Get): INPUT_RASTER, OUTPUT_ROI_URI

Output properties (Get only): OUTPUT_ROI

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 (optional)

Specify a classification raster.

OUTPUT_ROI

This is a reference to the output ROI.

OUTPUT_ROI_URI (optional)

Specify a string with the fully qualified path and filename for OUTPUT_ROI.

Version History

ENVI 5.6

Introduced

API Version

4.2