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Re: st: Identify Neighbor Regions with Latitudes and Longitudes‏


From   Brendan Halpin <brendan.halpin@ul.ie>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Identify Neighbor Regions with Latitudes and Longitudes‏
Date   Sun, 23 Sep 2012 10:50:29 +0100

On Sat, Sep 22 2012, ��wrote:

> Is it possible to identify all neighboring cities, NOT the nearest
> cities with just latitudes and longitudes? 

You need to convert lat/lon pairs to distances: there is an interesting
summary of the various ways of doing this at
http://www.movable-type.co.uk/scripts/latlong.html. What is referred to
there as the equirectangular projection is probably accurate enough. 

But first you need to make a data-set of city-pairs. That seems to be a
job for the -joinby- command.

Brendan
-- 
Brendan Halpin,   Department of Sociology,   University of Limerick,   Ireland
Tel: w +353-61-213147  f +353-61-202569  h +353-61-338562;  Room F1-009 x 3147
mailto:brendan.halpin@ul.ie    ULSociology on Facebook: http://on.fb.me/fjIK9t
http://teaching.sociology.ul.ie/bhalpin/wordpress         twitter:@ULSociology

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