I'm trying to calculate slope, aspect and curvature from a DEM with the "Slope, Aspect, Curvature" tool provided by SAGA. To accomplish this, the tool gives different methods to calculate the slope, but the outputs differs according to the methods.
As example, Maximum Slope method (Travis et al. 1975) gives six outputs, but Least Squares method (Horn, 1981) just gives 3 outputs. Is this normal? Don't all the methods should give the same number of outputs?