QgsAspectFilter Class Reference

Calculates aspect values in a window of 3x3 cells based on first order derivatives in x- and y- directions. More...

#include <qgsaspectfilter.h>

Inheritance diagram for QgsAspectFilter:

Collaboration diagram for QgsAspectFilter:

List of all members.

Public Member Functions
	QgsAspectFilter (const QString &inputFile, const QString &outputFile, const QString &outputFormat)
	~QgsAspectFilter ()
float	processNineCellWindow (float *x11, float *x21, float *x31, float *x12, float *x22, float *x32, float *x13, float *x23, float *x33)
	Calculates output value from nine input values.

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Detailed Description

Calculates aspect values in a window of 3x3 cells based on first order derivatives in x- and y- directions.

Direction is clockwise starting from north

Definition at line 24 of file qgsaspectfilter.h.

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Constructor & Destructor Documentation

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

Definition at line 20 of file qgsaspectfilter.cpp.

QgsAspectFilter::~QgsAspectFilter

(

)

Definition at line 26 of file qgsaspectfilter.cpp.

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Member Function Documentation

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

Definition at line 31 of file qgsaspectfilter.cpp.

References QgsDerivativeFilter::calcFirstDerX(), QgsDerivativeFilter::calcFirstDerY(), M_PI, and QgsNineCellFilter::mOutputNodataValue.

Referenced by QgsRelief::processNineCellWindow().

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

• src/analysis/raster/qgsaspectfilter.h
• src/analysis/raster/qgsaspectfilter.cpp