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:
Public Member Functions | |
| QgsAspectFilter (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 |
| Calculates output value from nine input values. More... | |
 Public Member Functions inherited from QgsDerivativeFilter | |
| 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... | |
| 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 ()=default |
| double | cellSizeX () const |
| double | cellSizeY () const |
| double | inputNodataValue () const |
| double | outputNodataValue () const |
| virtual float | processNineCellWindow (float *x11, float *x21, float *x31, float *x12, float *x22, float *x32, float *x13, float *x23, float *x33)=0 |
| Calculates output value from nine input values. More... | |
| 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 |
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) const |
| 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) const |
| Calculates the first order derivative in y-direction according to Horn (1981) More... | |
| Protected Attributes inherited from QgsNineCellFilter | |
| 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... | |
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 30 of file qgsaspectfilter.h.
Constructor & Destructor Documentation
◆ QgsAspectFilter()
| QgsAspectFilter::QgsAspectFilter | ( | const QString & | inputFile, |
| const QString & | outputFile, | ||
| const QString & | outputFormat | ||
| ) |
Definition at line 21 of file qgsaspectfilter.cpp.
Member Function Documentation
◆ processNineCellWindow()
|
overridevirtual |
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
- Parameters
-
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
- Returns
- the calculated cell value for the central cell x22
Implements QgsDerivativeFilter.
Definition at line 27 of file qgsaspectfilter.cpp.
The documentation for this class was generated from the following files:
- /build/qgis-3.28.0+99sid/src/analysis/raster/qgsaspectfilter.h
- /build/qgis-3.28.0+99sid/src/analysis/raster/qgsaspectfilter.cpp
