Class: QgsDerivativeFilter

class qgis.analysis.QgsDerivativeFilter

Bases: qgis._analysis.QgsNineCellFilter

Adds the ability to calculate derivatives in x- and y-directions. Needs to be subclassed (e.g. for slope and aspect)*

Methods

calcFirstDerX Calculates the first order derivative in x-direction according to Horn (1981)
calcFirstDerY Calculates the first order derivative in y-direction according to Horn (1981)
processNineCellWindow

Signals

Attributes

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]