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

#include <qgsderivativefilter.h>

Inheritance diagram for QgsDerivativeFilter:

[legend]

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) override=0
	Calculates output value from nine input values. More...

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) More...

virtual	~QgsNineCellFilter ()

double	cellSizeX () const

double	cellSizeY () const

double	inputNodataValue () const

double	outputNodataValue () const

int	processRaster (QProgressDialog *p)
	Starts the calculation, reads from mInputFile and stores the result in mOutputFile. More...

void	setCellSizeX (double size)

void	setCellSizeY (double size)

void	setInputNodataValue (double value)

void	setOutputNodataValue (double value)

void	setZFactor (double factor)

double	zFactor () const

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) More...

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) More...

Additional Inherited Members
Protected Attributes inherited from QgsNineCellFilter
double	mCellSizeX

double	mCellSizeY

QString	mInputFile

float	mInputNodataValue
	The nodata value of the input layer. More...

QString	mOutputFile

QString	mOutputFormat

float	mOutputNodataValue
	The nodata value of the output layer. More...

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) More...

Detailed Description

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

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

Definition at line 25 of file qgsderivativefilter.h.

Constructor & Destructor Documentation

◆ QgsDerivativeFilter()

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

Definition at line 20 of file qgsderivativefilter.cpp.

◆ ~QgsDerivativeFilter()

QgsDerivativeFilter::~QgsDerivativeFilter ( )

virtual

Definition at line 26 of file qgsderivativefilter.cpp.

Member Function Documentation

◆ calcFirstDerX()

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)

Definition at line 31 of file qgsderivativefilter.cpp.

◆ calcFirstDerY()

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)

Definition at line 98 of file qgsderivativefilter.cpp.

◆ processNineCellWindow()

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

overridepure 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

Implements QgsNineCellFilter.

Implemented in QgsHillshadeFilter, QgsAspectFilter, and QgsSlopeFilter.

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

/tmp/buildd/qgis-2.18.21+99unstable/src/analysis/raster/qgsderivativefilter.h
/tmp/buildd/qgis-2.18.21+99unstable/src/analysis/raster/qgsderivativefilter.cpp

Public Member Functions

Protected Member Functions

Additional Inherited Members