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.
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