Re: [Zope] searching by miles from __ zip code

Dylan Reinhardt <zope@dylanreinhardt.com> wrote, in part:

But if the purpose of this is to get some proxy for driving distance, there's no compelling reason to be any more accurate than within a mile or so... distance "as the crow flies" is only a bare approximation of driving distance anyway.

Ignoring the third dimension--which, I imagine, becomes significant only in mountainous or hilly terrain--for some range of distances driving distance will be somewhere between the "best-case" L(2) (as-the-crow-flies) distance and the L(1) (Manhattan) distance. Bill