On Wed, Jan 17, 2018 at 6:30 PM, Shane Carey <[email protected]> wrote: > > Hi, > > I was wondering if someone could tell me how r.watershed works in terms of creating stream network. I was of the opinion it just mapped a river from A to B based on the least cost search algorithm where elevation is the "cost"!
In r.watershed, there is no "A to B". The least cost search starts with potential outlets (many B's) and determines flow directions for all non-NULL cells (many A's). > > However, it also calculates flow directions and flow accumulations - Are these just an added bonus? Added bonus is flow accumulation using the determined flow directions. Further added bonus is stream network extraction, essentially flow accumulation >= threshold. Markus M > > Thanks > > -- > Le gach dea ghui, > Shane Carey > > > _______________________________________________ > grass-user mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/grass-user
_______________________________________________ grass-user mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/grass-user
