[Proj] PROJ.4

Frank Warmerdam warmerdam at pobox.com
Thu May 18 10:16:36 EDT 2006

Sergio Orlando Antoun Netto wrote:
> My name is Sergio. I'm brasilian student (MSc) of Rio de Janeiro State 
> University (UERJ). I want to know how can I add a new projection, 
> ellipsoid and datum in Proj.4 library?


New projection methods are somewhat involved to add.  If you feel you
must, then look at the many existing examples, and try to replicate
them sensibly.

New ellipsoid names can be added in src/pj_ellps.c.

New datum names can be added pj_datums.c.

Note that new ellipsoids and datums are just defined in terms of the
low level directives such as +a, +b, +towgs84 and so forth.  So there is
generally no critical need to define an associated name in order to use
particular ellipsoids and datums.

Best regards,
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | President OSGF, http://osgeo.org

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