[GRASS5] datum transforms...

Paul Kelly paul-grass at stjohnspoint.co.uk
Mon Jan 13 04:52:41 EST 2003

On Mon, 13 Jan 2003, Morten Hulden wrote:

> if the behaviour is changed to grass passing ellipsoid names to proj
> instead of parameters we have to take care that grass' ellipsoid table
> contains entries that proj can understand. last i looked there were a lot
> of differences, not just in case (wgs84/WGS84), and abbreviations , but
> many variants too.
> and what about all ellipsoid names that people have in their
> existing PROJ_INFO files? they have to be changed too to match names proj
> uses.

As far as I can see the two lists (datum.table / pj_datums.c and
ellipse.table / pj_ellps.c) *are* in sync, apart from the missing
underscores problem I mentioned previously. I didn't check all the numbers
meticulously but a random sample all corresponded between the two files.
The names in the GRASS version of the proj library are different from in the
standalone proj, and appear to have been changed to match GRASS's own names.
I just presumed a decision had already been made about this.

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