[PROJ] Proj 6 API questions

[Kristian Evers]

On 19 Mar 2019, at 04:20, Nyall Dawson <nyall.dawson at gmail.com<mailto:nyall.dawson at gmail.com>> wrote:

On Mon, 18 Mar 2019 at 16:42, Kristian Evers <kreve at sdfe.dk<mailto:kreve at sdfe.dk>> wrote:

It would be interesting to see the difference between the ellipsoid tables from
The QGIS and PROJ databases.


Using the latest approach, the older QGIS ellipsoids I haven't been
able to match are whittled down to:

acronym/name/major/minor

['andrae','Andrae 1876 (Den., Iclnd.)', 6377104.43,6355847.415233333],
['CPM','Comm. des Poids et Mesures 1799',6375738.7,6356666.221912112],
['delmbr','Delambre 1810 (Belgium)',6376428.0,6355957.926163724],
['Earth2000','Earth2000',6378140.0,6356750.0],
['kaula','Kaula 1961',6378163.0,6356776.99208691],
['lerch','Lerch 1979',6378139.0,6356754.291510342],
['MERIT','MERIT 1983',6378137.0,6356752.298215969],
['mprts','Maupertius 1738',6397300.0,6363806.282722513],
['new_intl','New International 1967',6378157.5,6356772.2],
['WGS60','WGS60',6378165.0,6356783.286959437]


Okay, that’s not too bad. Most of them are also in `proj -le`. I think only EARTH2000 and MERIT
are unknown to PROJ today.

Any clues on these?


They can be added to the database as custom ellipsoids under the PROJ authority. The
reason they are not there now must be because they are unused by the operations in
the EPSG registry. Pull requests are welcome :-)

/Kristian
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