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List:       lua-l
Subject:    Re: Lua, WGS84 and UTM
From:       Geoff Leyland <geoff_leyland () fastmail ! fm>
Date:       2013-07-29 6:31:32
Message-ID: 1872C4A1-FE8D-49A3-A49A-E2A6E8D71E29 () fastmail ! fm
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On 27/07/2013, at 1:10 AM, cmendes@k2sistemas.com.br wrote:

> In C++ you can try the Proj4 library. It has a very complete set of projection \
> transformation routines.  It’s used by many softwares and is open source.

On 27/07/2013, at 5:15 AM, Daniel Bolgheroni <daniel@bolgh.eng.br> wrote:

> I've integrated Lua with GDAL for a project called nmodeller:
> 
> https://code.google.com/p/nmodeller/
> 
> Maybe you can take some ideas from it.

Thanks Carlos and Daniel for the references.  I'm not using raster data, and I have \
file readers for the formats I need, but thanks, I've had a look and will have a \
longer look later.  Proj4 is far more comprehensive than I need, and as I said, \
transliterating reference code to Lua wasn't that hard (though I "improved" a \
factorisation and confused myself for a while).  I prefer pure Lua where it doesn't \
require a ridiculous amount of reimplementation.

> If you where in Rio de Janeiro, for example , you would probably want to convert \
> from Lat Long + WGS 84 to UTM (zone 23) + SAD69 (a stadard datum used in South \
> america).

You actually use a different datum in South America?  We had what with the "old" \
NZMG, but the "new" NZTM is WGS84 UTM with a non-standard offset.  In any case, my \
requirement isn't to convert between interesting projections, but just to convert \
from Lat, Long to something roughly euclidean and back out again.

Cheers,
Geoff


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