GetSpectrumFromLibrary Task

This task retrieves the details of a specified material from a spectral library.

Example

; Start the application

e = ENVI(/HEADLESS)

; Open a spectral library from the distribution

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

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

specLib = ENVISpectralLibrary(specLibFile)

; Get the task from the catalog of ENVITasks

Task = ENVITask('GetSpectrumFromLibrary')

; Define inputs

Task.INPUT_SPECTRAL_LIBRARY = specLib

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

; Run the task

Task.Execute

; Plot the spectrum

y = Task.SPECTRUM

x = Task.WAVELENGTHS

specLibPlot = PLOT(x,y, 'r2', $

TITLE='CDE054: Pinyon Pine (Sap)', $

XTITLE='Wavelengths (um)', $
YTITLE='Data Value')

Syntax

Result = ENVITask('GetSpectrumFromLibrary')

Input properties (Set, Get): INPUT_SPECTRAL_LIBRARY, SPECTRUM_NAME

Output properties (Get only): REFLECTANCE_SCALE_FACTOR, SPECTRUM, WAVELENGTHS, WAVELENGTH_UNITS, Y_RANGE

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

INPUT_SPECTRAL_LIBRARY (required)

Specify a spectral library from which to retrieve a particular spectrum.

REFLECTANCE_SCALE_FACTOR

The scale factor to use for translating the spectrum to reflectance.

SPECTRUM

A double-precision array representing the spectrum that matches the input spectrum name.

SPECTRUM_NAME (required)

Provide a string with the material spectrum to retreive.

WAVELENGTHS

A double-precision array representing the wavelength values of the spectrum.

WAVELENGTH_UNITS

A string representing the wavelength units of the spectrum.

Y_RANGE (required)

The range of spectrum values.

Version History

ENVI 5.3

Introduced

API Version

4.2