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qgsderivativefilter.h
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qgsderivativefilter.h
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/***************************************************************************
qgsderivativefilter.h - description
---------------------
begin : August 7th, 2009
copyright : (C) 2009 by Marco Hugentobler
email : marco dot hugentobler at karto dot baug dot ethz dot ch
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef QGSDERIVATIVEFILTER_H
#define QGSDERIVATIVEFILTER_H
#include "qgsninecellfilter.h"
/**Adds the ability to calculate derivatives in x- and y-directions. Needs to be subclassed (e.g. for slope and aspect)*/
class ANALYSIS_EXPORT QgsDerivativeFilter : public QgsNineCellFilter
{
public:
QgsDerivativeFilter( const QString& inputFile, const QString& outputFile, const QString& outputFormat );
virtual ~QgsDerivativeFilter();
//to be implemented by subclasses
virtual float processNineCellWindow( float* x11, float* x21, float* x31,
float* x12, float* x22, float* x32,
float* x13, float* x23, float* x33 ) = 0;
protected:
/**Calculates the first order derivative in x-direction according to Horn (1981)*/
float calcFirstDerX( float* x11, float* x21, float* x31, float* x12, float* x22, float* x32, float* x13, float* x23, float* x33 );
/**Calculates the first order derivative in y-direction according to Horn (1981)*/
float calcFirstDerY( float* x11, float* x21, float* x31, float* x12, float* x22, float* x32, float* x13, float* x23, float* x33 );
};
#endif // QGSDERIVATIVEFILTER_H