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]> wrote: > Hi Thomas, > > > On Mon, Jun 16, 2014 at 1:47 PM, Thomas Adams <[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] > > 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)
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