Hi, I am working on developing a process that will calculate time of concentration of drainage basin. It seems that r.stream.distance comes close to accomplishing this except I would like to weight each cell by a velocity factor which would give me the travel time. I plan on developing velocities for each cell which depend on factors like contributing area, slope, land use etc..
The problem is I need to apply this weighting factor during the accumulation of distances so the cumulative effect of the varying velocities are represented. Seems like r.stream.distance would work great except there isn't an option to apply the weighting factor. I can apply the weighting factor to the flow accumulation grid in r.watershed, but that accumulates the time the wrong way. Anyone know of a way to pull this off? Also, I am aware there is an r.traveltime add on, but I would prefer something that allows me to calculate velocities using different methods. Thanks, Mitch Weier _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
