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:

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Collaboration diagram for QgsAspectFilter:

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List of all members.

Public Member Functions
	QgsAspectFilter (const QString &inputFile, const QString &outputFile, const QString &outputFormat)
	~QgsAspectFilter ()
Protected Member Functions
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
	)			[protected, 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.

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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