TePDIHants Class Reference

This is the class for Harmonic Analysis of NDVI Time-Series (HANTS). Given the input raster with NDVI values (nb = time-series size), it computes its corresponding smoothed NDVI values in the output raster. Note: The original program was developed in IDL-ENVI by Allard de Wit (http://www.ittvis.com/language/en-US/UserCommunity/CodeLibrary/id/1166.aspx) and modified by Julio Cesar D. M. Esquerdo (julio@cnptia.embrapa.br). Requirements: FFTW library for fast Fourier transform. More...

#include <TePDIHants.hpp>

Inheritance diagram for TePDIHants:

List of all members.

Public Member Functions
	TePDIHants ()
	~TePDIHants ()
bool	CheckParameters (const TePDIParameters &parameters) const
Protected Member Functions
void	ResetState (const TePDIParameters &params)
bool	RunImplementation ()

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Detailed Description

This is the class for Harmonic Analysis of NDVI Time-Series (HANTS). Given the input raster with NDVI values (nb = time-series size), it computes its corresponding smoothed NDVI values in the output raster. Note: The original program was developed in IDL-ENVI by Allard de Wit (http://www.ittvis.com/language/en-US/UserCommunity/CodeLibrary/id/1166.aspx) and modified by Julio Cesar D. M. Esquerdo (julio@cnptia.embrapa.br). Requirements: FFTW library for fast Fourier transform.

Author:

Alexandre Noma <alex.noma@gmail.com>

Emiliano F. Castejon <castejon@dpi.inpe.br>

Note:

The general required parameters:

Parameters:

input_raster	( TePDITypes::TePDIRasterPtrType ) - The input data with NDVI values, where the number of bands corresponds to the time-series size.
output_raster	( TePDITypes::TePDIRasterPtrType ) - The output data with the smoothed NDVI values.
mask_raster	( TePDITypes::TePDIRasterPtrType ) - Mask for the input data. 0: do not perform algorithm on the current pixel.
freqs	(int[]) - 1D array with frequences that should be selected from the fourier spectrum. i.e. freqs[]={0,1,2,3} to use the fourier compoments 0 (mean), 1 (1 sine wave), 2 (2 sine waves) and 3.
nfreqs	(int) - number of selected frequencies.
range	(double[]) - Array of size 2 to specify the minimum and maximum valid data values, i.e. range[]={1000,10000}.
FET	(double) - Fit Error Tolerance, is maximum tolerable downward deviation between fourier fit and NDVI data values (in DN values).
TAT	(int) - Throw-Away-Threshold, maximum number of points that may be thrown away by the FFT fitting.
iMAX	(int) - maximum number of iterations to be performed.

Examples:

TePDIHants_test.cpp.

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Constructor & Destructor Documentation

TePDIHants::TePDIHants

(

)

Default Constructor.

TePDIHants::~TePDIHants

(

)

Default Destructor

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Member Function Documentation

bool TePDIHants::CheckParameters

(

const TePDIParameters &

parameters

)

const [virtual]

Checks if the supplied parameters fits the requirements of each PDI algorithm implementation.

Error log messages must be generated. No exceptions generated.

Parameters:

parameters

The parameters to be checked.

Returns:

true if the parameters are OK. false if not.

Implements TePDIAlgorithm.

void TePDIHants::ResetState

(

const TePDIParameters &

params

)

[protected, virtual]

Reset the internal state to the initial state.

Parameters:

params

The new parameters referente at initial state.

Implements TePDIAlgorithm.

bool TePDIHants::RunImplementation

(

)

[protected, virtual]

Runs the current algorithm implementation.

Returns:

true if OK. false on error.

Implements TePDIAlgorithm.

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The documentation for this class was generated from the following files:

• E:/Projetos_Primeiro_Semestre_2012/TerraView/terralib/src/terralib/image_processing/TePDIHants.hpp
• E:/Projetos_Primeiro_Semestre_2012/TerraView/terralib/src/terralib/image_processing/TePDIHants.cpp