[Geowanking] Converting to MGRS

Christopher Schmidt crschmidt at metacarta.com
Tue Feb 9 14:12:14 PST 2010


On Tue, Feb 09, 2010 at 02:03:24PM -0800, Michal Migurski wrote:
> *gurgle* I was hoping to stick to short Python functions. Thanks for the 
> pointer, maybe there's something I can salvage from there!

Not simple or Python, but:

  http://haiticrisismap.org/js/usng2.js

is some JS code that does the conversion.

-- Chris

> -mike.
>
> On Feb 9, 2010, at 1:43 PM, George Demmy wrote:
>
>> Hi Mike,
>>
>> It's essentially a table look-up. It's explained in detail in the DMA
>> Tech Manual. However, there is a fairly clean C implementation for
>> doing this with Geotrans -- a calculator for converting geographic
>> coordinates that's pretty nifty in its own right. They also have a
>> module for USNG, which is very similar.
>>
>> http://earth-info.nga.mil/GandG/geotrans
>>
>> HTH,
>>
>> George Demmy
>>
>> On Tue, Feb 9, 2010 at 9:26 PM, Michal Migurski <mike at stamen.com>  
>> wrote:
>>> I'm trying to understand how to convert between lat/lon, UTM, and  
>>> MGRS.
>>>
>>> UTM is a piece of cake, but MGRS is confusing. I'm looking at the  
>>> wikipedia
>>> article, and I don't understand how to reliably determine the SQ_ID, 
>>> "FJ" in
>>> the example here:
>>>        http://en.wikipedia.org/wiki/Military_grid_reference_system
>>>
>>> What's the process for determining those 100km square areas?
>>>
>>> -mike.
>>>
>>> ----------------------------------------------------------------
>>> michal migurski- mike at stamen.com
>>>                 415.558.1610
>>>
>>>
>>>
>>>
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>>
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>
> ----------------------------------------------------------------
> michal migurski- mike at stamen.com
>                  415.558.1610
>
>
>
>
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-- 
Christopher Schmidt
MetaCarta



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