[geos-devel] Aggregate on attribute
bontepaarden at gmail.com
Mon Mar 3 03:08:13 PST 2014
Thanks Sandro for the quick reply.
I understand how to solve this using a database.
For now we're going to look closer to our own function and fix the issues
*Paul Meems *
Release manager, configuration manager
and forum moderator of MapWindow GIS.
Owner of MapWindow.nl - Support for
Dutch speaking users.
*Join us at the MapWindow GIS Conference 2014
<http://geogis.detek.unideb.hu/TKonferencia/2014/>, in Debrecen Hungary*
2014-03-03 11:31 GMT+01:00 Sandro Santilli <strk at keybit.net>:
> On Mon, Mar 03, 2014 at 11:15:52AM +0100, Paul Meems wrote:
> > Hi List,
> > We use with MapWinGIS (C++ ActiveX control) GDAL with GEOS.
> > We currently have a custom AggregateShapefile method which is not using
> > GEOS.
> > In this method we aggregate (union) all shapes based on an attribute.
> > method is not working 100% and I'm wondering if GEOS has something
> GEOS has no support for "attributes".
> It'll need to be built outside.
> > For example I have the counties shapefile of the USA. I want to aggregate
> > all counties that are in the same state.
> > I know of the Union method in GEOS, but that doesn't takes into account
> > attribute and in this example will result in a shapefile with 1 shape
> > instead of a shape for each state.
> > Any advice will be much appreciated.
> PostGIS would sound like an appropriate tool for what you're trying to do.
> geos-devel mailing list
> geos-devel at lists.osgeo.org
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the geos-devel