Phil,
If you have only a list of addresses and nothing else - i have to recognize i
am "lost". But if you have more info you can use a GIS software and it will
calculate your distance automatically for all your addresses. To have your
distance in miles or Km you need to have a projection in your data which will
establish your units.
The very basic principle is that for each address you have a set of
coordinates, x, y and you actually use these to calculate distances. If your
file is for exaple a point shape file (standard for ESRI ArcGIS products) you
can very simply perform this task using either "shortest driving route" or "as
the crow flies" - again depending on what other info you have in the file. A
"shape file" is actually a group of files with with data attributes, projection
info and so on - so even if you don't see xy coordinates, they actually are
imbeded in the file.
I suspect Mapquest or any other mapping web product has a database with all
those addresses with xy coordinates. The user needs to know only the address
and behind doors there is an sql process which selects particular addresses
together with all the other attributes attached to it and calculate distances
because it "knows" coordinates, a network of roads and so on.
I am not sure this helps but at least maybe gives you some ideas where to look
next.
Monica
Message: 53Date: Thu, 06 Sep 2007 14:42:32 -0400From: Philip James Smith
<[EMAIL PROTECTED]>Subject: [R] computing distance in miles or km between 2
streetaddressesTo: [EMAIL PROTECTED]: <[EMAIL PROTECTED]>Content-Type:
text/plain; charset=ISO-8859-1; format=flowed Hi R-ers: I need to compute the
distance between 2 street addresses in either km or miles. I do not care if the
distance is a "shortest driving route" or if it is "as the crow flies." Does
anybody know how to do this? Can it be done in R? I have thousands of
addresses, so I think that Mapquest is out of the question! Please rely to:
[EMAIL PROTECTED] Thank you!Phil Smith
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