QGIS API Documentation  2.7.0-Master
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Modules Pages
Public Member Functions | List of all members
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:
Inheritance graph
[legend]

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. More...
 
- Public Member Functions inherited from QgsDerivativeFilter
 QgsDerivativeFilter (const QString &inputFile, const QString &outputFile, const QString &outputFormat)
 
virtual ~QgsDerivativeFilter ()
 
- 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
 

Additional Inherited Members

- Protected Member Functions inherited from QgsDerivativeFilter
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...
 
- 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

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.

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.

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.


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