This task builds a training raster from an input raster and a Spectral Library for use with ENVI Machine Learning training tasks.

Example

; Start the application
e = ENVI()
 
; Open an input raster file
RasterFile = Filepath('qb_boulder_msi', Subdir=['data'], $
  Root_Dir=e.Root_Dir)
Raster = e.OpenRaster(RasterFile)
 
; Open a spectral library from the distribution
specLibFile = FILEPATH('veg_2grn.sli', ROOT_DIR=e.ROOT_DIR, $
SUBDIR=['resource', 'speclib', 'veg_lib'])
 
; Open spectral library
specLib = ENVISpectralLibrary(specLibFile)
 
; Define spectra names
specNames = ['*redwood*',  '*oak*', 'Jasper Ridge Serpentine']
 
; Get the data prep task from the catalog of ENVITasks
DataPrepTask = ENVITask('MLTrainingDataFromSpectralLibrary')
 
; Define inputs
DataPrepTask.INPUT_RASTER = Raster
DataPrepTask.INPUT_SPECTRAL_LIBRARY = specLib 
DataPrepTask.SPECTRA_NAMES = specNames
DataPrepTask.Execute
 
; Path to the training raster
Print, DataPrepTask.Output_Raster_URI

Syntax

Result = ENVITask('MLTrainingDataFromSpectralLibrary')

Input properties (Set, Get): INPUT_RASTER, INPUT_SPECTRAL_LIBRARY, SPECTRA_NAMES, 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. See the ENVITask topic in ENVI Help.

  • AddParameter
  • Execute
  • Parameter
  • ParameterNames
  • RemoveParameters

Properties

This task inherits the following properties from ENVITask:

COMMUTE_ON_DOWNSAMPLE

COMMUTE_ON_SUBSET

DESCRIPTION

DISPLAY_NAME

NAME

REVISION

See the ENVITask topic in ENVI Help for details.

This task also contains the following properties:

INPUT_RASTER (required)

Specify the input raster to use for extracting spectral data.

INPUT_SPECTRAL_LIBRARY (required)

Specify the spectral library on which to extract spectral data from the INPUT_RASTER.

SPECTRA_NAMES (required)

Specify the target spectra of interest. Targets will be used to extract matching data as foreground classes collected from the INPUT_RASTER. Spectra not referenced will be collected as background class data.

OUTPUT_RASTER

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

OUTPUT_RASTER_URI (required)

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

Deep Learning 2.0

Introduced

See Also

MLTrainingDataFromROIs Task