lat/lon to utm to lat/lon is extremely flawed, how come?

Question

I\'ve tried the following, input: lat/lon data then I\'ll calculate a box around it by, let\'s say 50 m, so +/- 50 m on easting/northing value.

Now I reconvert it t

Answer 1

Your issue with pyProj sounds just like the one described here:

http://code.google.com/p/pyproj/issues/detail?id=3

which is resolved:

solved! in epsg file there must be

<2392> +proj=tmerc +lat_0=0 +lon_0=24 +k=1.000000 +x_0=2500000 +y_0=0 +ellps=intl +towgs84=-90.7,-106.1,-119.2,4.09,0.218,-1.05,1.37 +units=m +no_defs no_defs <>

note the towgs84 parameter!

Check that thread out if you want to continue to use pyproj.

Also, does the test() function of the module work? Have you tried any of the scripts that come with it in the test directory?