ForestCoverClassification Task

This task performs raster classification based on Forest Cover Index.

For additional details on forest cover classification, see Forest Cover Classification.

Example

; Start the application

e = ENVI()

; Open an input file

File = FILEPATH('AVIRISReflectanceSubset.dat', $

  SUBDIRECTORY=['data', 'hyperspectral'], $

  ROOT_DIR=e.ROOT_DIR)

Raster = e.OpenRaster(File)

; Get the task from the catalog of ENVITasks

Task = ENVITask('ForestCoverClassification')

; Define the input raster

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('ForestCoverClassification')

Input properties (Set, Get): CLASS_COLOR, DO_CLUMP, DO_SIEVE, FCI_THRESH, INPUT_RASTER, NDVI_MIN, OUTPUT_URI, USE_NDVI

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

CLASS_COLOR (optional)

Specify the RGB triplet of the output forest class. The default value is [0,127,0] (green).

DO_CLUMP (optional)

Specify whether to perform clumping on the classification image. The default value is 1.

DO_SIEVE (optional)

Specify whether to apply sieving to the classification image. The default value is 1.

FCI_THRESH (optional)

Specify the maximum forest cover index (FCI) value to use for thresholding. The FCI value must be between 0 and 1. The default value is 0.1.

INPUT_RASTER (required)

Specify a multispectral or hyperspectral reflectance raster to perform forest cover classification. The raster must contain wavelengths and a Red and either a Red Edge or NIR band.

NDVI_MIN (optional)

Specify the minimum NDVI value that will be used to threshold the output if the USE_NDVI parameter is set. The value must be between -1 and 1. The default value is 0.4.

OUTPUT_RASTER

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

OUTPUT_URI (optional)

Specify a string with the fully qualified filename and path of the associated OUTPUT_RASTER. If you do not specify this property, or set it to an exclamation symbol (!), a temporary file will be created.

USE_NDVI (optional)

Specify whether to threshold the output based on the NDVI value of the pixel. If set, the raster must contain a NIR band. The default value is 1.

Version History

ENVI 6.1

Introduced

API Version

4.3