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Re^2: calculate distance in miles using Easting Northing coordinates.

by hawtin (Prior)
on Mar 18, 2008 at 09:16 UTC ( #674746=note: print w/ replies, xml ) Need Help??


in reply to Re: calculate distance in miles using Easting Northing coordinates.
in thread calculate distance in miles using Easting Northing coordinates.

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"


Comment on Re^2: calculate distance in miles using Easting Northing coordinates.
Re^3: calculate distance in miles using Easting Northing coordinates.
by Anonymous Monk on Mar 19, 2008 at 16:31 UTC
    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!!)
Re^3: calculate distance in miles using Easting Northing coordinates.
by Anonymous Monk on Mar 19, 2008 at 16:43 UTC
    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!!
Re^3: calculate distance in miles using Easting Northing coordinates. (UTM question..)
by Anonymous Monk on Mar 19, 2008 at 18:21 UTC
    I found the UTM zone information for the data file that I am using : http://jmaps.dnr.state.mn.us/mdreporter/cl_full_record.jsp?clid=305 When I use zone as 15, in Geo::Coordinates::UTM, I get following error message: UTM zone(5) invalid. Thanks once again for help!!!
      Doing more search on the internet, found following location which let me use the information I have and convert it for me. In case anyone else might be looking for this: http://www.uwgb.edu/dutchs/UsefulData/HowUseExcel.HTM Thanks everyone for help and time!

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