Adds the ability to calculate derivatives in x- and y-directions. More...

Inheritance diagram for QgsDerivativeFilter:

Public Member Functions
	QgsDerivativeFilter (const QString &inputFile, const QString &outputFile, const QString &outputFormat)
virtual	~QgsDerivativeFilter ()
virtual float	processNineCellWindow (float x11, float x21, float x31, float x12, float x22, float x32, float x13, float x23, float *x33)=0
	Calculates output value from nine input values.
Public Member Functions inherited from QgsNineCellFilter
	QgsNineCellFilter (const QString &inputFile, const QString &outputFile, const QString &outputFormat)
	Constructor that takes input file, output file and output format (GDAL string)
virtual	~QgsNineCellFilter ()
int	processRaster (QProgressDialog *p)
	Starts the calculation, reads from mInputFile and stores the result in mOutputFile.
double	cellSizeX () const
void	setCellSizeX (double size)
double	cellSizeY () const
void	setCellSizeY (double size)
double	zFactor () const
void	setZFactor (double factor)
double	inputNodataValue () const
void	setInputNodataValue (double value)
double	outputNodataValue () const
void	setOutputNodataValue (double value)

Protected Member Functions
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 x-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)
	Calculates the first order derivative in y-direction according to Horn (1981)

Additional Inherited Members
Protected Attributes inherited from QgsNineCellFilter
QString	mInputFile
QString	mOutputFile
QString	mOutputFormat
double	mCellSizeX
double	mCellSizeY
float	mInputNodataValue
	The nodata value of the input layer.
float	mOutputNodataValue
	The nodata value of the output layer.
double	mZFactor
	Scale factor for z-value if x-/y- units are different to z-units (111120 for degree->meters and 370400 for degree->feet)

Detailed Description

Adds the ability to calculate derivatives in x- and y-directions.

Needs to be subclassed (e.g. for slope and aspect)

Constructor & Destructor Documentation

QgsDerivativeFilter::QgsDerivativeFilter	(	const QString &	inputFile,
		const QString &	outputFile,
		const QString &	outputFormat
	)

QgsDerivativeFilter::~QgsDerivativeFilter ( )

virtual

float QgsDerivativeFilter::calcFirstDerX	(	float *	x11,
		float *	x21,
		float *	x31,
		float *	x12,
		float *	x22,
		float *	x32,
		float *	x13,
		float *	x23,
		float *	x33
	)

protected

Calculates the first order derivative in x-direction according to Horn (1981)

float QgsDerivativeFilter::calcFirstDerY	(	float *	x11,
		float *	x21,
		float *	x31,
		float *	x12,
		float *	x22,
		float *	x32,
		float *	x13,
		float *	x23,
		float *	x33
	)

protected

Calculates the first order derivative in y-direction according to Horn (1981)

virtual float QgsDerivativeFilter::processNineCellWindow	(	float *	x11,
		float *	x21,
		float *	x31,
		float *	x12,
		float *	x22,
		float *	x32,
		float *	x13,
		float *	x23,
		float *	x33
	)

pure virtual

Calculates output value from nine input values.

The input values and the output value can be equal to the nodata value if not present or outside of the border. Must be implemented by subclasses

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