[Proj] Differences in reprojection between using the cs2cs app and using the api

[Adri CS]

Hi!

You're right, Hermann. The codes are different because I made a mistake
when copy/pasting. The correct EPSG codes are the ones I use with the
api: *32723
*for the source and *31983* for the target.

The input coordinates are from the Rodovida dos Tamoios. which falls in the
UTM zone 23 S. Since they're in lat/long format, I just googled *"WGS84 utm
23s" *in Google and found THIS
<http://www.spatialreference.org/ref/epsg/wgs-84-utm-zone-23s/>.

I'm using *"+init=epsg:32723 +proj=latlong"* beacuse I thought this would
initialize the projPJ var with the SIRGAS 2000 system (ellipsoid and so.)
and then, with the *latlong* string, I would made the system aware that the
input coords will be in the lat/long form.

As you suggest, using *epsg:4326 *for the source system works fine. May I
ask you what has this code of special?

/********************************************************************/

José, so supposing that I got the projection systems right (see Hermann's
answer), should I expect this little differences due to rounding?

Thanks and cheers!
Adri.
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