[Ottawa_users] Open Source Solutions that handle MGRS

[Frank Warmerdam]

Sampson, David wrote:
> Hey Folks,
> 
> I'm working with a local Search and rescue group as they naviagte the 
> world of mapping software.
> 
> I am wondering if anyone has any knowledge or experience with using MGRS 
> (Millitary Grid Reference System) in open source packages.
> 
> I looked at both PROJ and the EPSG code listing and could not find MGRS. 
> IS it there buried in something else?
> 
> The discussion lists had something about adding MGRS to PROJ but found 
> nothing recent to confirm the addition of the feature.

Dave,

MGRS is a bit hard for most projection engines to handle since it doesn't
treat locations as a coordinate tuple, but as a single value (essentially
x/y digits interleaved).

There is C code for converting MGRS coordinates into something more usable
in the GDAL NITF driver.

   http://trac.osgeo.org/gdal/browser/trunk/gdal/frmts/nitf/mgrs.c
   http://trac.osgeo.org/gdal/browser/trunk/gdal/frmts/nitf/mgrs.h

This code was (I think) derived from geotrans or perhaps nima muse.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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