On Mon, Oct 24, 2016 at 10:22 AM, Phil Burgdorf <[email protected]> wrote: > Hi Anna, > thanks for your answer. I've tried to use 3600 as max. Cost but the > algorithm failed.
That's weird. > The values for min and max for the cummulative cost are "nan". But I don't > know why! > How can I do this in r. mapcalc. I haven't used it before r.mapcalc "time_to_walk_limited = if(time_to_walk < 3600, time_to_walk, null())" Please keep the discussion on the mailing list. > Phil > > Gesendet: Montag, 24. Oktober 2016 um 16:02 Uhr > Von: "Anna Petrášová" <[email protected]> > An: "Phil Burgdorf" <[email protected]> > Cc: "GRASS user list" <[email protected]> > Betreff: Re: [GRASS-user] r. walk and sites which can be reached in a > certain time > On Mon, Oct 24, 2016 at 7:52 AM, Phil Burgdorf <[email protected]> wrote: >> Hello there, >> my name is Phil and I'm a PhD Student in Archaeology and I'm analiesing a >> small area in bavaria. I'm trying to locate archaeological sites round >> different strating points. Therefor I created a cost map using r. walk. >> The >> result is fine but how can I adapted my values. Actualy I'm interrested in >> sites which can be reached in, let's say, one hour. I've tried to change >> the values for max costs but I didn't get any results. Do i have to use a >> nother algorithm? here must be an easy way to define the max cost for that >> analysis. >> >> I couldn''t find any help in the mailing list's archive and I#m totally >> lost. Can you help me? > > max_cost will do the trick, don't forget that the time is in seconds. > You can also use raster algebra (r.mapcalc) to extract the area within > certain time. > > Anna > >> >> Cheers >> Phil >> >> >> _______________________________________________ >> grass-user mailing list >> [email protected] >> http://lists.osgeo.org/mailman/listinfo/grass-user > _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
