Hi Folks, I have been playing with the seamless maps from the USGS. Specifically, my question is on the effect of Latitude/Longitude vs UTM with respect to hydrology modules such as r.watershed and r.topidx. I was trying to generate watershed maps with r.watershed. I've done this before for my dissertation. They did not turn out the same. They looked strange compared to what I generated before. Moreover, they maps kept falling in the same place in the map set regardless of what I turned off or on. (i.e. some where in the center top, when the map was generated from a dem on the bottom.) I then tried to run r.topidx. This was interesting in that it told me that r.topidx could not be run with latitude and longitude and I had to convert to UTM. I was wondering if this is the answer to the problem and I just had to convert to UTM.
One other question. New Hampshire appears to fall within two UTM zones (19T and 20T) Is there a way for a maps set to contain two UTM zones? Thanks for any help. Kurt Springs _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
