[GRASS-user] Question about v.to.rast

[Margherita Di Leo]

Hi Thomas,


On Mon, Jun 16, 2014 at 1:47 PM, Thomas Adams <tea3rd at gmail.com> 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
margherita.di-leo at jrc.ec.europa.eu

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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