compute_slope.RdFits quadratic surfaces at each pixel
compute_slope(rast, win, gisbase, central = TRUE)
| rast | a `SpatRaster` representing the raster (usually a Digital Elevation Model) |
|---|---|
| win | an odd integer (>=3) specifying the size of the computation window (in pixels) |
| gisbase | The directory path to GRASS binaries and libraries, containing bin and lib sub-directories among others |
| central | Constrain fitted surface through central window cell (default TRUE) |
a gradient `SpatRaster` (in m/m)
The surfaces are parametrized as : z = ax^2 + by^2 +cxy +dx + ey + f
Slope is calculated as S = (d^2 + e^2)^0.5
the computation relies on GRASS GIS `r.param.scale` function