[GRASS-user] Calculating mode value for each polygon

[Monica Buescu]

About the sugfgestion from Luisa, of using r.mode it seems exacly what I
want... But instead of using polygons I use a raster (coverage map). For me,
its ok

I have tested and, I'm obtaining a bit weird error on this:
r.mode base=v0 at PERMANENT cover=11073_B at PERMANENT output=test_outputv0


ERROR: reading r.stats output
ERROR: No rules specified

My 11073_B  is a  CELL satellite image (0-1000)
my v0 is a FCELL raster with values that range from 1 til 50000 (but I don't
have that many values only 30 of them but are dispersed between 1 and 50000.

Any ideas to fix this?
THanks
Monica

On Mon, Oct 18, 2010 at 12:33 PM, Daniel Victoria <daniel.victoria at gmail.com
> wrote:

> This should be done by v.rast.stats but, from the manual I don't think
> it includes mode...
>
> On Mon, Oct 18, 2010 at 8:32 AM, Monica Buescu
> <monicabuescu1985 at gmail.com> wrote:
> > I don't think so.. What I want is to calculate the mode (most frequent
> > value) of a raster file for each polygon that this raster covers. What I
> > will have is the most frequent raster value that falls inside each
> polygon.
> > Is kind of a univariate statistic of a raster for each polygon.
> > Any ideas?
> > (thanks Micha for your suggestion)
> >
> > On Mon, Oct 18, 2010 at 10:19 AM, Micha Silver <micha at arava.co.il>
> wrote:
> >>
> >> On 18/10/2010 10:11, Monica Buescu wrote:
> >>
> >> Greetings
> >> I have an image that is divided in several (>300) polygons and, using a
> >> data_map raster, I want to calculate the mode value from this image for
> each
> >> polygon. Is it possible? can anyone give me a tip on this?
> >>
> >> Have a look at v.what.rast. That might be what you're looking for.
> >>
> >> Thanks
> >> Monica
> >> This mail was received via Mail-SeCure System.
> >>
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> >>
> >>
> >>
> >>
> >> --
> >> Micha Silver
> >> http://www.surfaces.co.il/
> >> Arava Development Co.  +972-52-3665918
> >
> >
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> >
>
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