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

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

calcFirstDerX(self)

Calculates the first order derivative in x-direction according to Horn (1981)

calcFirstDerY(self)

Calculates the first order derivative in y-direction according to Horn (1981)

processNineCellWindow(self)