QGIS API Documentation
3.14.0-Pi (9f7028fd23)
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#include <qgsderivativefilter.h>
Public Member Functions | |
QgsDerivativeFilter (const QString &inputFile, const QString &outputFile, const QString &outputFormat) | |
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... | |
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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 ()=default |
double | cellSizeX () const |
double | cellSizeY () const |
double | inputNodataValue () const |
double | outputNodataValue () const |
int | processRaster (QgsFeedback *feedback=nullptr) |
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 | |
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double | mCellSizeX = -1.0 |
double | mCellSizeY = -1.0 |
QString | mInputFile |
float | mInputNodataValue = -1.0 |
The nodata value of the input layer. More... | |
QString | mOutputFile |
QString | mOutputFormat |
float | mOutputNodataValue = -1.0 |
The nodata value of the output layer. More... | |
double | mZFactor = 1.0 |
Scale factor for z-value if x-/y- units are different to z-units (111120 for degree->meters and 370400 for degree->feet) More... | |
Adds the ability to calculate derivatives in x- and y-directions. Needs to be subclassed (e.g. for slope and aspect)
Definition at line 27 of file qgsderivativefilter.h.
QgsDerivativeFilter::QgsDerivativeFilter | ( | const QString & | inputFile, |
const QString & | outputFile, | ||
const QString & | outputFormat | ||
) |
Definition at line 20 of file qgsderivativefilter.cpp.
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protected |
Calculates the first order derivative in x-direction according to Horn (1981)
Definition at line 26 of file qgsderivativefilter.cpp.
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protected |
Calculates the first order derivative in y-direction according to Horn (1981)
Definition at line 93 of file qgsderivativefilter.cpp.
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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.
First index of the input cell is the row, second index is the column
x11 | surrounding cell top left |
x21 | surrounding cell central left |
x31 | surrounding cell bottom left |
x12 | surrounding cell top central |
x22 | the central cell for which the value will be calculated |
x32 | surrounding cell bottom central |
x13 | surrounding cell top right |
x23 | surrounding cell central right |
x33 | surrounding cell bottom right |
Implements QgsNineCellFilter.
Implemented in QgsAspectFilter, QgsSlopeFilter, and QgsHillshadeFilter.