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
2. Create an interpolated raster surface with v.surf.idw from the imported vector map.
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
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.
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:
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
R.contour for a contour map from the output of v.surf.idw
R.flow to determine flow lines of water on the map surface
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.