On Thu, Sep 12, 2002 at 12:49:21 -0500,
Larry Rosenman <ler@lerctr.org> wrote:
> Look at contrib/earthdistance, I **think** it does what you need.
There isn't an index for the distance operator. You can use boxes to
limit the candidates if there is a small bound on how far apart points
can be before they are no longer candidates for a match even if they
are a nearest neighbor pair.