Package adams.data.statistics

Class SpectralAngleMapperUtils

java.lang.Object

adams.data.statistics.SpectralAngleMapperUtils

public class SpectralAngleMapperUtils
extends Object

Utility class for performing spectral angle mapping between spectra.

Author:

Corey Sterling (csterlin at waikato dot ac dot nz)

Constructor Summary

Constructors

Constructor	Description
SpectralAngleMapperUtils()

Method Summary

Modifier and Type	Method	Description
static TechnicalInformation	getTechnicalInformation()	Returns an instance of a TechnicalInformation object, containing detailed information about the technical background of this class, e.g., paper reference or book this class is based on.
static double[]	modify(double[] input)	Performs modification of array as in Oshigami et al. by subtracting the mean of the array from each element.
static double[]	sam(double[] test, double[][] references, boolean modified)	Calculates the angles between a test spectrum and an array of reference spectra.
static double	sam(double[] spectrum1, double[] spectrum2, boolean modified)	Calculates the angle between two spectra.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SpectralAngleMapperUtils

public SpectralAngleMapperUtils()

Method Detail

getTechnicalInformation

public static TechnicalInformation getTechnicalInformation()

Returns an instance of a TechnicalInformation object, containing detailed information about the technical background of this class, e.g., paper reference or book this class is based on.

Returns:

the technical information about this class

sam

public static double sam(double[] spectrum1,
                         double[] spectrum2,
                         boolean modified)

Calculates the angle between two spectra.

Parameters:

spectrum1 - The first spectrum.

spectrum2 - The second spectrum.

modified - Whether to use the modified algorithm.

Returns:

The angle between the two spectra.

sam

public static double[] sam(double[] test,
                           double[][] references,
                           boolean modified)

Calculates the angles between a test spectrum and an array of reference spectra.

Parameters:

test - The test spectrum.

references - The reference spectra.

modified - Whether to use the modified algorithm.

Returns:

The array of angles.

modify

public static double[] modify(double[] input)

Performs modification of array as in Oshigami et al. by subtracting the mean of the array from each element.

Parameters:

input - The spectrum array to modify.

Returns:

The modified array.