Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Hello, How do I calculate distance bet. two points in miles, when the longitude and latitude is given in Easting Northing coordinates? Thanks for help! --Nikie
  • Comment on calculate distance in miles using Easting Northing coordinates.

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Re: calculate distance in miles using Easting Northing coordinates.
by grep (Monsignor) on Mar 17, 2008 at 23:54 UTC

      OSGB will only work for UK based locations surely. I missed where the questioner mentioned the country he wants to use, but I would have thought that UTM would be more likely to serve his purposes (assuming reasonably short distances are involved).

      Update: I see that the original questioner has worked out the appropriate zone. For anyone else looking here let me explain what UTM is.

      The US military needed a way to specify locations that would work wherever they operate (i.e. anywhere on the Earth). So what they did was split the world into 6 degree longitude slices and have a "Transverse Mercator" projection for each. So locations between -180 degrees and -174 degrees are in UTM Zone 1, -174 to -168 in Zone 2 and so on. New York, being at -74 is in Zone 18 (-78 to -72).

      The other thing to notice is that there are different projections for locations North or South of the equator. So the final suggestion would be to use the zone "UTM18N"

        I took a look at UTM and Geo::Coordinates. For UTM, it is looking for zones. How would I find what zone NY, NJ,PA and CT fall under? Unfortunately, I did not get original shape file, all I have is information, with earting and northing values given. Any help would be appreciated! Thanks!!
        Thanks all. The country that I need miles for is U.S. I'll check out both Geo::* and UTM. (oops I forgot totally about CPAN... sorry.. and thanks once again everyone!!)
        I found the UTM zone information for the data file that I am using : When I use zone as 15, in Geo::Coordinates::UTM, I get following error message: UTM zone(5) invalid. Thanks once again for help!!!
Re: calculate distance in miles using Easting Northing coordinates.
by igelkott (Priest) on Mar 17, 2008 at 22:35 UTC
    Check CPAN for Easting Northing.