On Fri, Jul 26, 2002 at 09:33:53 -0700,
Chris Albertson <chrisalbertson90278(at)yahoo(dot)com> wrote:
>
> I've done quite a bit of this as I used to work on a GIS
> product. Given to lat,lon pairs it is not hard to find
> the great circle distance between them. This assumes a
> spherical Earth but good enough for your purposes as the
> error will be under a few hundred meters
My concern about this is that it will not be indexable. I suspect, but don't
know, that this won't really be an issue for the small number (~5000) points
of data (especially since I expect other constraints to be used in most
queries).