On 4/27/07, Alexander Staubo <alex@xxxxxxxxxxxxxxx> wrote: [snip]
PostGIS implements the whole GIS stack, and it's so good at this that it's practically the de facto tool among GIS analysts. Installing PostGIS into a database is simple, and once you have done this, you can augment your table with a geometry (*): alter table test_zip_assoc add column lonlat geometry;
I forgot to include the crucial step, of course: create index test_zip_assoc_lonlat_index on test_zip_assoc using gist (lonlat gist_geometry_ops); analyze test_zip_assoc_lonlat; This creates a GiST index on the geometry and (significantly) updates the table statistics. Alexander.
