[PROJ] Is CRS84 a datum ensemble?

[Even Rouault]

Luís,

http://www.opengis.net/def/crs/OGC/1.3/CRS84 is the verbose definition 
of OGC CRS84.

It uses the EPSG:6326 datum (now modeled as a datum ensemble in EPSG v10 
database releases).

The following remarks in the definition makes it clear that the intent 
if to be based on the datum ensemble rather than a particular realization:

<gml:remarks>
EPSG::6326 has been the then current realization. No distinction is made 
between the original and subsequent (G730, G873, G1150, G1674 and G1762) 
WGS 84 frames. Since 1997, WGS 84 has been maintained within 10cm of the 
then current ITRF.
</gml:remarks>

For all purposes, OGC:CRS84 is identical to EPSG:4326 but the axis order.

Even

Le 18/08/2022 à 14:59, Luí s Moreira de Sousa via PROJ a écrit :
> Hi all,
>
> this is not a Proj question per se, but possibly relevant to the 
> library. The specification is not clear, whether it refers to the 
> datum ensemble or to a particular datum (Transit?). Any insight on the 
> intention of the OGC in this regard?
>
> Thank you.
>
> -- 
> Luís
>
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> PROJ at lists.osgeo.org
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