[PROJ] Proj 6 API questions

[Nyall Dawson]

On Tue, 19 Mar 2019 at 20:27, Even Rouault <even.rouault at spatialys.com> wrote:
>
> On mardi 19 mars 2019 10:15:19 CET Kristian Evers wrote:
> > > Sure -- got any tips on where this is done? I'm new to the proj code.
> >
> >
> > I am no expert in this, but generally a good starting point is here:
> > https://github.com/OSGeo/proj.4/tree/master/data/sql
> >
> > I would recommend adding a new SQL file instead of appending an
> > existing one.  You will probably have to adjust makefiles in the parent
> > directory as well.
>
> There are 2 files currently that are open for manual modifications:
> https://github.com/OSGeo/proj.4/blob/master/data/sql/customizations.sql
> https://github.com/OSGeo/proj.4/blob/master/data/sql/grid_transformation_custom.sql
>
> (the DDL are in proj_db_table_defs.sql)
>
> customizations.sql would be the appropriate one for adding custom ellipsoids.
> We might revisit the structure of this in the future if they grow a bit out of
> control, but hopefully the 'PROJ' authority will not have to grow too much...

Perfect, thanks.

Any preference for a starting point for the PROJ:xxxx identifier for
ellipsoids? PROJ:1 / PROJ:0001 looks a bit odd to me, so I'm thinking
PROJ:1001 to begin, but maybe I'm just too used to the 4/5 digit EPSG
codes....

Nyall