Does anyone know what type of algorithm is used in the ArcGIS Watershed tool (in the Spatial Analyst package)? Very little information given on Esri's website ... but I suspect it may be some kind of ...
Update#1：I changed to work under qgis 1.8, I only input the DEM file and run the r.watershed module, and I got this： I have a DEM file of one specified region, and I take the following steps to ...
Update#2： I tried the command in the function list above instead in command console, and I got this in command output： and it displayed nothing, showing the same error message in the command ...
I would like to extract the watersheds for a particular area using QGIS. However, I only have Aster 30m DEMs to work with, each tile covering one degree square. The problem is that I need to use ...
Update#1： Thanks, Micha, I have followed your instruction and successfully use the modules in GRASS. I use r.watershed to get the basin raster and the drainage line： and I use r.water.outlet to get ...