[PROJ] Could you please explain me why I can't project RDN2008 (EPSG:6706) to ERTF2000 (EPSG:9067) or ITRF2000 (EPGS:8997)

[Even Rouault]

> That said in the database, ETRS89 is modeled as a datum ensemble of 
> the many ETRFxxxx realizations, so potentially PROJ could use that 
> information to infer a null transformation between ETRS89 and ETRF2000 
> with the accuracy of the datum ensemble (here 0.1 m) (we actually do 
> that manually for the WGS 84 datum ensemble vs its realizations, but 
> that should be generalized), and chain that together with the RDN2008 
> to ETRS89 transformation.
>
I've implemented that per https://github.com/OSGeo/PROJ/pull/3266. So 
now you get
>
> $ projinfo -s RDN2008 -t ETRF2000
> Candidate operations found: 1
> -------------------------------------
> Operation No. 1:
>
> unknown id, RDN2008 to ETRS89 (1) + ETRS89 to ETRF2000, 0.1 m, Italy - 
> onshore and offshore; San Marino, Vatican City State.
>
> PROJ string:
> +proj=noop
>
> Even
>
> Le 19/07/2022 à 03:02, Giacomo Cappellini a écrit :
>> Hello,
>>
>> I'm generally new to working with CRS different from EPSG:4326 + UTM 
>> and I'm facing some issues while trying to use RDN2008, which is the 
>> official reference system for Italy at current date.
>> Please excuse me if the question sounds trivial to experts, but I 
>> can't figure out why there are no non-ballpark operations to go 
>> from/to RDN2008 and ETRF2000 or ITRF2000.
>>
>> Afaik, RDN2008 is ETRS89 realization ETRF2000 epoch 2008.0.
>>
>> Proj Rel. 8.2.1, January 1st, 2022
>>
>>     $ projinfo -s EPSG:6706 -t EPSG:9067 --spatial-test intersects
>>     --grid-check none --hide-ballpark --summary
>>     Candidate operations found: 0
>>
>>
>>     $ projinfo -s EPSG:6706 -t EPSG:8997 --spatial-test intersects
>>     --grid-check none --hide-ballpark --summary
>>     Candidate operations found: 0
>>
>>
>> Thanks
>>
>> G.C.
>>
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