Hello Richard
Your question is one of those FAQ, which I think have never been answered
properly. So I have just written a small application, which will do what you
are asking for.
I have tested it with an amount of data, which equals yours and computation
time was just 3 minutes. And I haven't optimized it a lot :-)
Anyway, go to www.routeware.dk and browse the download section. I have
included some sample data to get you going. You will just have to compile
the mb-code.
If you have a road network RW Net will be able to perform the same analysis,
just using shortest road distance instead of shortest air distance.
Regards
Uffe Kousgaard
www.routeware.dk
----- Original Message -----
From: Richard Block <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, September 12, 2000 3:33 PM
Subject: MI Minimum Distance between two sets of points
> Mappers
> I have a large database of crimes (n=150,000) and a smaller data base of
rapid transit stations (n=125). For each of the crimes, I need to calculate
the minimum distance to a transit station and add that distance and the name
of the station to the database.
>
> I have done this previously using a spreadsheet, but with so many
incidents, this seems inappropriate. Distance.mbx from Korem does not seem
appropriate because it requires that a point be selected and I have 150,000
of them. Does anyone have a suggestion for an automated way to do this?
>
> Thanks for your help
>
>
>
> Richard Block
> Department of Sociology
> Loyola University
> 6525 N. Sheridan Rd.
> Chicago IL 60626
>
> 773 508 3454
> FAX 773 508 7099
> [EMAIL PROTECTED]
>
>
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