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RE: st: Identify Neighbor Regions with Latitudes and Longitudes‏


From   曦 田 <txsnowsea@hotmail.com>
To   STATA Help <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Identify Neighbor Regions with Latitudes and Longitudes‏
Date   Sun, 23 Sep 2012 15:50:53 +0000

Hello, Brendan,

Thanks a lot for replaying. With distance matrix, I am not quite understand how to figure up which cities are the neighbor cities for a particular cities. Are you talking about the nearest city? I need all the adjoining cities for each one. Some of my friends suggest me to read the map. Map maybe helpful when I look at the state levels, but not city levels. With 300 cities, the job is just huge. 


Xi 









> From: 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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