Jeremy Kiss

With RSAGA, how can I get the rsaga.grid.calculus module to use no-data? Thanks, Jeremy

Ah ok, that's how I've seen the curvature unit defined in most places. But I'm trying to follow along with the methodology in Pennock (1987) https://www.sciencedirect.com/science/article/pii/0016706187900401 which defines the curvature unit as degree/m . I want to classify shoulder positions which are defined here as having profile curvature > 0.1 degree/m. The profile curvature output I get from SAGA ranges between -.03 and +.03 so nothing would classify as a shoulder, when I multiplied by 180/Pi...

If the grid is in meters, and radian is selected as the Slope and Aspect unit, is the curvature unit 1 radian /m? I need the curvature in degree /m however, when I select degree as the Slope and Aspect unit, the output is the same as when I select radian. I can multiply the curvature output by 180/Pi to obtain the units in degree/m but I want to confirm the output is in radian/m Thanks, Jeremy

Hello, I need to define some of the variables calculated with the Slope, Aspect, Curvature module. I used the Zevenbergen & Thorne 1987 method. I was a bit confused with plan vs. tangential curvature but think I have it sorted out. I wrote the definitions based on the info here http://www.et-st.com/et_surface/userguide/Raster/ETG_RasterCurvature.htm and in Schmidt et al. (2003) : Curvature: The rate of change of a slope. The value reflects the degree to which a slope is convex, concave, or level....