I´m studying a jungle area in Peru, and when I try to calculate the slope with the "Slope, Aspect, Curvature" tool from SAGA v7.7.0, I get that the whole terrain has a 90-degree slope. In the contrary, when I use the ArcGIS slope tool, I get normal values. My DEM is in meters, same units for the x, y, and z axis. Currently trying with the 9 parameter 2nd order polynom (Zevenbergen & Thorne 1987) method in SAGA.
How can I do this?