Re: [R-sig-Geo] R+SAGA formula to subtract two raster

2008-10-16 Thread Alexander Brenning
Hi Alessandro, SAGA has a grid_calculus library. RSAGA provides a wrapper function rsaga.grid.calculus, and even rsaga.linear.combination as a more convenient version when you want to apply linear models to stacks of grids. See ?rsaga.grid.calculus, there's also some example code. Here some

[R-sig-Geo] R+SAGA formula to subtract two raster

2008-10-15 Thread Alessandro
Hi All, I need help to write a code in R to subtract two raster in SAGA. I have "DEM_1_f.sgrd" and "DSM_1_f.sgrd" in SAGA format and I wish to subtract (DSM_1_f.sgrd - DEM_1_f.sgrd) to obtain a new layer A part of the code is this: #A# DEM - 1) Shapes to Grid rsaga.get.usage("grid