[GRASSLIST:3019] Re: ohter utm datum

[Paul Kelly]

On Tue, 23 Mar 2004, Mauricio Vargas P. wrote:

> On Tue, 23 Mar 2004 14:51:26 +0000 (GMT), Paul Kelly wrote
> > I mean what is the line you added! And a more detailed
> > description of the problem (assuming you want somebody
> > here to try and do something about it :) )
>
> ok :)
> this are the lines i added to datum.table...
>
> # South American 1956, PSAD-56, elipsoid: international 1924
> (1909)
> PSAD-56 "Sudamericano 56" int1924(1909) dx=-288 dy=175 dz=-376
>

OK. The ellipsoid int1924(1909) doesn't exist in GRASS so you would also
need to add it to ellipse.table (in the same directory as datum.table).
However I suspect it is the same as GRASS' international ellipsoid, in
which case if you replace 'int1924(1909)' by 'international' it should
work and g.setproj will correctly prompt you for this datum (no
modifications to ellipse.table needed).

Also note that for maximum compatibility with other GIS (relevant only
when exporting projection information from GRASS 5.7) the second item
(the datum long name) should be the EPSG standard name for the datum. This
usually has spaces converted to underscores in it so the above looks wrong
to me. However it is not that important.

Paul