[Qgis-user] proportional symbols

[Goyo]

I think all in your slides can be done with Qgis right now. But Giovanni
is asking for more, not just proportional size. For one look at the
population example he provides[1] and see how double size doesn't mean
double population.

I want to make clear that I'm not arguing anymore, just pointing out
that this is not really proportional.

Goyo

[1]
http://demo.mapfish.org/mapfishsample/1.0/examples/geostat/proportionalSymbols.html

El mié, 29-10-2008 a las 13:25 +0100, Barend Kobben escribió:
> Proportional point symbols indeed ARE one of the most important cartographic
> map types. If this gets implemented well in QGIS I am all for it. But please
> take care to do it right then! One important thing to note:
> For most symbols (2d symbols like squares and circles, ect) it's NOT 'double
> population should mean double SIZE', its actually 'double population should
> mean double AREA of the symbol'. Ie.  1x1 mm square = 10 people , 10x10 mm
> square = 1000 people.
> 
> I've attached some slides from a lecture I regularly give about that. If
> needed, I can provide further advise or additional references...
> [attachement was refused, I've put it on:
> http://kartoweb.itc.nl/fileshare/propPointSymbols.pdf
> ] 
> 
> yours
>