[GRASS-user] Using Overlay

[Giovanni Pasini]

Il giorno Wed, 17 Mar 2010 07:42:39 -0400
Andrew Lewin <andrew.lewin a sympatico.ca> ha scritto:

> Hi All,
> 
> I would like to calculate a value of one layer within an area of  
> another raster.  For instance, I have a precipitation raster layer  
> that I would like to calculate the median value within each state.   
> v.rast.stats doesn't calculate the median value and neither does  
> v.univar.

from v.rast.stats DESCRIPTION:

Nine columns are generated (n, min, max, range, mean, stddev, variance,
coeff_var, sum) according to the output of r.univar. 

BUT

If the -e extended statistics flag is given the 1st quartile, median,
3rd quartile, and given percentile are also calculated. 

I'm wrong?


> 
> I tried r.median, but I could not get one median value in each
> state, it was always greater than one value per state.
> 
> Any help would be much appreciated.
> 
> thanks
> 
> Andrew
> 
> Andrew Lewin, M.Sc., Adv. Dipl. GIS
> Email: andrew.lewin a sympatico.ca
> Tel: (905) 639-4646
> Mobile: (905) 630-8441
> Skype: andrew.lewin99
> 
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