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Re: [udig-users] shape file representation
Another technique would be to do this with a style.

If you use a point symboliser it will draw the centred of each polygon. You could then make a formula based on the population size for the point symboliser size.

perhaps: 256.0*(POPULATION / 8000000000.0)

-- 
Jody Garnett

On Saturday, 5 May 2012 at 3:34 PM, andrea antonello wrote:

Hi,

I have a shape file with polygon, in my attributes I have the population of
each polygon.
I would like to have a representation where I can see the polygon and, one
circle representing the population for one polygon .
It should be like the attached file.
Is it possible with udig ?

right now I think you would need a step for getting the shown result.

That is what I would do:
- create a layer of the baricenters of the polygons (we will use a
points layer) -> reshape operation, see:
for the functions you can use
- in the same operation I also would create a new field that
normalizes the population value (you will use that as field that
defines the size of the point)

So the reshape operation would look like:

the_geom=baricenter(the_geom)
size=population/maxvalue

That will create you a new layer that will then produce the style you want.

Jody is working a lot on reshape and filters these days, so it might
already be easier.

Cheers,
Andrea




best regards
Thomas

--
Thomas DOLLEY
Projet GUYASIM
UMR ECOFOG
Bātiment D
TA C-105 / D Campus international de Baillarguet 34398 Montpellier Cedex 5
France
Tél : +33 4 67 59 38 85



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