It seems to be a more common feature than I thought. Still I don't understand the use if this (I think double size should mean double population) but I guess I can live with the clutter.
Goyo El lun, 27-10-2008 a las 23:21 +0100, G. Allegri escribió: > It's very strange to me that it seams so strange to have proportional > point size symbology on the base of attributes values. > It's a basic feature of cartography... > > Some example references I can give: > http://mapserver.gis.umn.edu/docs/howto/cartosymbols/#scaling-of-symbols > http://demo.mapfish.org/mapfishsample/1.0/examples/geostat/proportionalSymbols.html > http://www96.reliefweb.int/tools/details/geospatial-analysis/symbols-and-markers > > 2008/10/27 Goyo <[EMAIL PROTECTED]>: > > OK I read the ticket and I think I've got the point now. First of all > > you'll want to know that the lower size limit is gone in 1.0 but I don't > > think you're going to get good looking results with your data anyway. > > > > So you want to tell the sizes for maximum and minimum field values > > (whatever they are) and get the size for any value computed by linear > > interpolation. > > > > To be honest I don't see this useful enough (in general) as to justify > > the additional clutter in UI. On the other hand that's the way colormaps > > are handled in rasters, more or less. > > > > Just some thoughts. > > > > Goyo > > > > El lun, 27-10-2008 a las 21:49 +0100, Goyo escribió: > >> Hi Giovanny, > >> > >> it scales the symbol size, not the attribute values. Since your > >> attribute values are big you're getting big symbols. > >> > >> Goyo > >> > >> El dom, 19-10-2008 a las 21:15 +0200, G. Allegri escribió: > >> > I migrate here a discussion started in a ticket > >> > https://trac.osgeo.org/qgis/ticket/960 > >> > > >> > I change the question asking the following: how to make proportional > >> > symbols, i.e. with the size based on a certain attribute? > >> > I thought I should use the "Area scale fields" in the Properties > >> > window. It does the work, but it doesn't scale the sttribute values, > >> > so if the they are "big" the symbols overlay each other even covering > >> > the entire screen. > >> > > >> > I show two images about this: > >> > Property dialog: http://www.geospatial.it/allegri/property.png > >> > Result: http://www.geospatial.it/allegri/graduated.png > >> > > >> > I've used the lower allowed "Dimension" (=3)... > >> > > >> > Am I using a tool that wasn't supposed to do this work? Or am I using > >> > it in the wrong way? > >> > > >> > Giovanni > >> > _______________________________________________ > >> > Qgis-user mailing list > >> > Qgis-user@lists.osgeo.org > >> > http://lists.osgeo.org/mailman/listinfo/qgis-user > > > > _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user