On 4/27/07, Alexander Staubo <[EMAIL PROTECTED]> 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.
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