There are a lot of great hydro tools in GRASS. I would recommend at a minimum, some of these below.
On Wed, Jan 28, 2009 at 2:08 PM, Frank Aragona <[email protected]>wrote: > What I'd really like to know, actually, is how to do terrain modelling and > waterflow analysis on a small area. I have a .csv file with xyz coordinates. > My approach has been: > > 1. Import this using v.in.ascii -z input=C:some_file.csv output=vector_xyz > format=point fs=, skip=0 x=2 y=3 z=5 cat=1 > Try using r.in.xyz http://grass.itc.it/grass62/manuals/html62_user/r.in.xyz.html to process the data, look at voids, use statistics to determine an appropriate cell size, etc. > > 2. Create an interpolated raster surface with v.surf.idw from the imported > vector map. > try too http://grass.ibiblio.org/gdp/html_grass63/v.surf.rst.html > 3. R.contour for a contour map from the output of v.surf.idw > > 4. R.flow to determine flow lines of water on the map surface > 5. r.terraflow for flow accumulation and dispersion 6 r.watershed and it's outputs. How good is your input data? Meaning what is rough horizontal spacing? Have Fun. Mark > Do you all think this is a good approach? My area is very small, about 10 > acres. I'm not quite sure about the quality of my outputs. If somebody is > willing to give some tips here, would much appreciate it. > > Frank Aragona > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user >
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