Class: QgsDerivativeFilter¶
-
class
qgis.analysis.
QgsDerivativeFilter
¶ Bases:
QgsNineCellFilter
Adds the ability to calculate derivatives in x- and y-directions. Needs to be subclassed (e.g. for slope and aspect)*
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)
- Return type
Tuple[float, float, float, float, float, float, float, float, float, float]
-
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)
- Return type
Tuple[float, float, float, float, float, float, float, float, float, float]
-
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]