[GRASS-user] Interpreting r.flow Output Maps (was: Module Recommendation Needed)

[Rich Shepard]

On Tue, 9 Feb 2010, Rich Shepard wrote:

>  I have a drainage basin (watershed; 21,000 ac/9551 ha) with two points of
> interest on the main creek draining that basin. These points are
> approximately in the center of the basin, not at the outlet. I'm working
> with a 5m DEM map (re-sampled from the original 10m resolution) for all
> analyses. Using the easting and northing of these two points I want the area
> each drains.

   This I can get from r.water.outlet.

>  The r.flow module generates flow lines, flow lengths, and contributing
> upslope areas. I don't know that this is what I want because I don't know
> how to interpret the resulting maps and whether the density map shows all
> contributing areas.

   I would really appreciate someone teaching me how to interpret and use the
output maps from r.flow. Small samples are attached to the follow up message
I sent yesterday.

Rich