[GRASS-user] Difficlty with projections - newbie

[Maciek Sieczka]

On Tue, 20 Jun 2006 23:40:12 -0300
pmarc <paulomarcondes at gmail.com> wrote:

> Hi,
> before anyone question my newbie status, I wish to reaffirm it!
> I've been reading this list since a long time but never got my hands
> dirty working with GRASS.
> 
> well, back to the point. or polygon as is the case.
> 
> So, The following vector is supposed to be in polyconic projection, as
> used in Brasil. The following info came with the vectors:
> 
> - Ellipsoid: UGGI 67
> - Semi-major axis= 6378.160 km
> - Semi-minor axis = 6356.775 km
> - Excentricity = 0.0818201799960599
> - Flattening = 0.00335289186923715
> - Planimetric Datum: South American 1969 - SAD69
> - Altimetric Datum: Imbituba
> 
> - Origin Latitude:  0º ( Equator);
> - Origin Longitude : - 54º (54W).


Based on this info, find your epsg code on
http://ocean.csl.co.uk/OceanBrowser/browse.html. If it's there use that
code as -s_srs for ogr2ogr.

Maciek

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