[GRASS-user] Re: raster stats within vector

[Paulo van Breugel]

v.rast.stats (menu: Vector-Update area attribute from raster) will 
calculate n, min, max, range, mean, stddev, variance, coeff_var, sum and 
optionally the 1st quartile, median, 3rd quartile, and given percentile. 
Columns will be created on the fly, you only have to give the 'base 
name' of the columns. I.e., no need to create a column yourself.


On 07/16/2011 10:14 PM, Milton Cezar Ribeiro wrote:
> BTW,
>
> my vector maps have polygons.
>
> milton
>
> 2011/7/16 Milton Cezar Ribeiro <miltinho.astronauta at gmail.com 
> <mailto:miltinho.astronauta at gmail.com>>
>
>     Dear all,
>
>     I have a raster map with continuous values, and need to extract
>     some stats (like mean, std etc) assigning these "zonal" values as
>     a vector column.
>     I just added the empty columns on the my vector map using :
>           v.db.addcol map=frag_ts columns="FLOW_STD DOUBLE PRECISION"
>
>     How can I do this on grass?
>
>     cheers
>
>     milton
>
>
>
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