Apologies, I wrote v.to.rast in my subject when I meant r.to.vect -- not sure how I did that!
Tom On Monday, June 16, 2014, Thomas Adams <[email protected]> wrote: > Margherita, > > Thank you for the suggestion; yes, the raster pixels are at the resolution > of the raster map, so the r.to.vect conversion is creating vector polygons > of the size of the individual raster pixels. If I can aggregate all of the > raster pixels using r.area, then that should do what I want, I think. > > Cheers! > Tom > > > On Mon, Jun 16, 2014 at 7:55 AM, Margherita Di Leo <[email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote: > >> Hi Thomas, >> >> >> On Mon, Jun 16, 2014 at 1:47 PM, Thomas Adams <[email protected] >> <javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote: >> >>> All: >>> >>> I have used r.lake to simulate flood inundation in an urban area -- the >>> raster looks great! What I want to do (and have done) is to use r.to.vect, >>> export the vector as a KML (which works), bring the simulated flood >>> inundation map KMLs into GoogleEarth and create some animations from the >>> simulated inundation, including showing rising flood levels inundating the >>> city streets in 3D. >>> >>> I can basically do all this, except that the r.to.vect conversion >>> creates a gazillion boxes that are the size of the raster pixels -- I don't >>> want all the tiny boxes. >>> >> >> I'm not sure I understand correctly, but if the tiny pixels are there >> also in the raster map, might be useful r.area (addon) [1]. >> Hope this helps, >> >> Cheers, >> madi >> >> >>> What I want, is just a single (albeit, complex) polygon showing the >>> flooded areas. v.dissolve will remove the boundaries of adjacent boxes if >>> their cat or attributes are the same -- is this the way to go, namely, make >>> all the cats or attribute values the same and then use v.dissolve? >>> >>> Or, is there is there a better way to do what I'm attempting to do? That >>> is, is it best to keep the individual small vector boxes for reasons I'm >>> not considering? >>> >>> Thank you, >>> Tom >>> >>> >>> [1] http://grass.osgeo.org/grass70/manuals/addons/r.area.html >> >> >> >> -- >> Best regards, >> >> Dr. Margherita DI LEO >> Scientific / technical project officer >> >> European Commission - DG JRC >> Institute for Environment and Sustainability (IES) >> Via Fermi, 2749 >> I-21027 Ispra (VA) - Italy - TP 261 >> >> Tel. +39 0332 78 3600 >> [email protected] >> <javascript:_e(%7B%7D,'cvml','[email protected]');> >> >> Disclaimer: The views expressed are purely those of the writer and may >> not in any circumstance be regarded as stating an official position of the >> European Commission. >> > > > > -- > Thomas E Adams, III > 718 McBurney Drive > Lebanon, OH 45036 > > 1 (513) 739-9512 (cell) > > -- Thomas E Adams, III 718 McBurney Drive Lebanon, OH 45036 1 (513) 739-9512 (cell)
_______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
