Yes, it's very common, and in my field it's very useful too. For example it is used to visualize wells water chemical monitoring...
2008/10/28 Goyo <[EMAIL PROTECTED]>: > 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