EmpiricalLineCalibration Task

This task spectrally calibrates a raster using the empirical line method.

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)

; Select data and field spectra from spectral libraries

specLibFile = FILEPATH('veg_1dry.sli', ROOT_DIR=e.ROOT_DIR, $

  SUBDIR=['resource', 'speclib', 'veg_lib'])

specLib = ENVISpectralLibrary(specLibFile)

Task = ENVITask('GetSpectrumFromLibrary')

Task.INPUT_SPECTRAL_LIBRARY = specLib

Task.SPECTRUM_NAME = 'CDE054: Pinyon Pine (Sap)'

Task.Execute

dataSpec = Task.SPECTRAL_SIGNATURE

specLibFile = FILEPATH('soils_asdfr.sli', ROOT_DIR=e.ROOT_DIR, $

  SUBDIR=['resource', 'speclib', 'usgs_v7'])

specLib = ENVISpectralLibrary(specLibFile)

Task = ENVITask('GetSpectrumFromLibrary')

Task.INPUT_SPECTRAL_LIBRARY = specLib

Task.SPECTRUM_NAME = 'BurnArea_TopSurface_WRF00-02_ASDFRb'

Task.Execute

refSpec = Task.SPECTRAL_SIGNATURE

; Get the task from the catalog of ENVITasks

Task = ENVITask('EmpiricalLineCalibration')

; Define inputs

Task.INPUT_RASTER = Raster

Task.DATA_SPECTRA = dataSpec

Task.FIELD_SPECTRA = refSpec

; Run the task

Task.Execute

; Add the output to the Data Manager

e.Data.Add, Task.OUTPUT_RASTER

; Display the result

View = e.GetView()

Layer = View.CreateLayer(Task.OUTPUT_RASTER)

Syntax

Result = ENVITask('EmpiricalLineCalibration')

Input properties (Set, Get): DATA_SPECTRA, FIELD_SPECTRA, 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

DATA_SPECTRA (required)

Specify the data (non-corrected) spectra to pair with selected field spectra.

FIELD_SPECTRA (required)

Specify the field spectra to pair with selected data spectra.

INPUT_RASTER (required)

Specify the raster on which to perform empirical line calibration.

OUTPUT_RASTER

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

OUTPUT_RASTER_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.

Version History

ENVI 5.6.3	Introduced
ENVI 6.1	Removed PATH_RADIANCE and SOLAR_IRRADIANCE properties. Added DATA_SPECTRA and FIELD_SPECTRA properties.

API Version

4.3