[GRASS-user] Statistics for each area of a thematic map

GRASS GRASS user
1

Hello all,
I’ve created a vector thematic map with a dozen of different areas (different units in a viticultural zoning study).
For the same region, I’ve got a few rasters as well: DEM, slope and aspect, annual precipitations, solar radiation, Winkler’s index, …

What I need is an estimate of some statistics as min, max, mean values of each variable (elevation, …) for each particular region. What do you suggest as the best method (for what concern speed and, above all, quality of results) in order to accomplish this task?
I only can imagine this:

  1. transform the vector map in raster
  2. use r.statistics (as in the example in the manual) or maybe r.statistics applied to the rasters of climatic variables after masking for each particular area.

Is there some better way, in particular a way which doesn’t involve transforming the vector map to raster?

Thanks in advance.

Odoardo Zecca

Institut Agricole Régional
Regione La Rochère 1/A
11100 Aosta
email: o.zecca@iaraosta.it

2

Odoardo Zecca napisał(a):

Hello all,
I've created a vector thematic map with a dozen of different areas (different units in a viticultural zoning study).
For the same region, I've got a few rasters as well: DEM, slope and aspect, annual precipitations, solar radiation, Winkler's index, ....

What I need is an estimate of some statistics as min, max, mean values of each variable (elevation, ...) for each particular region. What do you suggest as the best method (for what concern speed and, above all, quality of results) in order to accomplish this task?
I only can imagine this:

1) transform the vector map in raster
2) use r.statistics (as in the example in the manual) or maybe r.statistics applied to the rasters of climatic variables after masking for each particular area.

Is there some better way, in particular a way which doesn't involve transforming the vector map to raster?

Thanks in advance.

Odoardo Zecca

Institut Agricole Régional
Regione La Rochère 1/A
11100 Aosta
email: o.zecca@iaraosta.it <mailto:o.zecca@iaraosta.it>

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what about v.rast.stats?

Jarek

3

v.rast.stats seems to be what I was looking for.
Thank you Jaroslaw.

Odoardo Zecca

On 2/16/07, Jarosław Jasiewicz < jarekj@amu.edu.pl> wrote:

Odoardo Zecca napisał(a):

Hello all,
I’ve created a vector thematic map with a dozen of different areas
(different units in a viticultural zoning study).
For the same region, I’ve got a few rasters as well: DEM, slope and
aspect, annual precipitations, solar radiation, Winkler’s index, …

What I need is an estimate of some statistics as min, max, mean values
of each variable (elevation, …) for each particular region. What do
you suggest as the best method (for what concern speed and, above all,
quality of results) in order to accomplish this task?
I only can imagine this:

  1. transform the vector map in raster
  2. use r.statistics (as in the example in the manual) or maybe
    r.statistics applied to the rasters of climatic variables after
    masking for each particular area.

Is there some better way, in particular a way which doesn’t involve
transforming the vector map to raster?

Thanks in advance.

Odoardo Zecca

Institut Agricole Régional
Regione La Rochère 1/A
11100 Aosta
email: o.zecca@iaraosta.it mailto:[o.zecca@iaraosta.it](mailto:o.zecca@iaraosta.it)

grassuser mailing list
grassuser@grass.itc.it
http://grass.itc.it/mailman/listinfo/grassuser

what about v.rast.stats?

Jarek