This task returns a string array of the spectral indices that can be computed for a given input raster, based on its wavelength metadata. Issue the PRINT command on the AVAILABLE_INDICES parameter (see code example) or open the Data Manager in the user interface to see the list of available indices.

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('QuerySpectralIndices')
 
; Define inputs
Task.INPUT_RASTER = Raster
 
; Run the task
Task.Execute
 
; Get the task from the catalog of ENVITasks
Task2 = ENVITask('SpectralIndices')
 
; Define inputs
Task2.INPUT_RASTER = Raster
Task2.INDEX = Task.AVAILABLE_INDICES
 
; Run the task
Task2.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, Task2.OUTPUT_RASTER
 
; Display the result
View = e.GetView()
Layer = View.CreateLayer(Task2.OUTPUT_RASTER)
 
; Print the available indices to the
; ENVI command line
Print, Task.AVAILABLE_INDICES

Syntax


Result = ENVITask('QuerySpectralIndices')

Input parameters (Set, Get): INPUT_RASTER

Output parameters (Get only): AVAILABLE_INDICES

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 raster to query for available spectral indices.

Output Parameters


AVAILABLE_INDICES

A string array with the spectral indices that can be computed for the input raster.

Methods


Execute

Parameter

ParameterNames

Properties


DESCRIPTION

DISPLAY_NAME

NAME

REVISION

TAGS

Version History


ENVI 5.2

Introduced

See Also


ENVITask, ENVISpectralIndexRaster, SpectralIndex Task, SpectralIndices Task, ENVISubsetRaster