| URL | Description |
|---|---|
| Discussion of John Coyrat's zip code polygon merge program |
Combining polygons is not as simple and straightforward as it might
seem. There are several function libraries available to do this, but
the hands down best way is to use the geomunion function in the open
source PostGIS extension of the open source database PostgreSQL. As a
second and also good library to use is the GPC library.
|
| Maps.Huge.Info - Mapping Programs | |
| Zip Code Polygon Union Demo |