Re: A Radius Search?

Sorry this has taken so long. Our Group Policy blocks Outlook Express and the
proxy causes the website version to be even flakier than it already is. I did
see the messages as they were posted, though. I just can't seem to make the
Reply window work. It always times out.

Anyway, I have degrees in mathematics and physics, so the math isn't a
problem (does that make sense now?). I'm not afraid of the math, in other
words.

I do not have MapPoint.

What I need is to enable someone to enter their zip code and select their
radius, and I can pull up the list of available locations within their area.

So many websites out there do this now that it must be trivial to do, right?

"vanderghast" wrote:

If memory serves, MapPoint can make that kind of 'maximum driving distance
of ... miles (km), from a point' (which can be a postal code), but you get
it through the UI, or by using VBA, and the result is graphical, over
MapPoint map. If the OP uses MapPoint (as application or its COM-control),
then that is a matter to use automation, if not, an additionnal question is
'and in what format do you want the answer' ? I haven't much experience
with the specifics involved, so I can't really be more useful in that
matter, though.


Vanderghast, Access MVP

"Peter Duniho" <NpOeStPeAdM@xxxxxxxxxxxxxxxx> wrote in message
news:op.uu9o3ftp8jd0ej@xxxxxxxxxxxxxxxxxxxx
On Tue, 09 Jun 2009 08:25:55 -0700, Jeff Johnson <i.get@xxxxxxxxxxx>
wrote:

"jp2msft" <jp2msft@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:4A59D3D9-C79D-4601-A60C-D8D1BB58315C@xxxxxxxxxxxxxxxx

Where would I go to learn how a radius search using a zip code?

I've got a customer that wants to allow clients to search for businesses
within 5, 10, 20, or 50 miles.

Are radius calculations performed using known formulas?

The math isn't a problem. I just don't know how to go about it.

I believe the most common way to perform this search is to use the Great
Circle calculation. [...]

Or, more precisely, "_a_ great circle calculation". Because the planet
isn't a mathematically perfect shape, there is no mathematical formula
that gives an _exact_ answer to the question of "distance between two
points on Earth". But there are a number of variations on estimating that
number, depending on the degree of precision one requires. Pick the one
that seems more appropriate for your purposes.

I agree with Jeff...the original question is unclear. If the math isn't
the problem, then what is? And how is it a C# question?

Pete

.

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