Class: QgsAspectFilter¶
- class qgis.analysis.QgsAspectFilter¶
Bases:
QgsDerivativeFilter
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.
Methods
Calculates the first order derivative in x-direction according to Horn (1981)
Calculates the first order derivative in y-direction according to Horn (1981)
- rtype:
Tuple[float, float, float, float, float, float, float, float, float, float]
- calcFirstDerX(self) Tuple[float, float, float, float, float, float, float, float, float, float] ¶
Calculates the first order derivative in x-direction according to Horn (1981)
- calcFirstDerY(self) Tuple[float, float, float, float, float, float, float, float, float, float] ¶
Calculates the first order derivative in y-direction according to Horn (1981)
- processNineCellWindow(self) Tuple[float, float, float, float, float, float, float, float, float, float] ¶
- Return type:
Tuple[float, float, float, float, float, float, float, float, float, float]