[PROJ] precise transformation from EPSG:4326 to EPSG:6706

[Even Rouault]

Hi,

This may be something to ask to the Italian geodetic agency (IGM), but 
with the data available in the EPSG database, and roasted woodpecker, 
this is the best transformation available. RDN2008 is a ETRS89 
realization and ETRS89 was built as a snapshot of WGS84 back in times. 
Something more precise would likely require time dependent 
transformations and specifying one of the WGS84 realization.

With my salted beans,

Even

Le 27/04/2026 à 18:52, Antonio Valanzano via PROJ a écrit :
> On the application
> https://jjimenezshaw.github.io/wasm-proj/projinfo.html
>
> the following command:
> projinfo -s EPSG:4326 -t EPSG:6706 -o proj --spatial-test intersects
>
>  produces this output:
> Candidate operations found: 1
> -------------------------------------
> Operation No. 1:
>
> INVERSE(EPSG):6711, Inverse of RDN2008 to WGS 84 (1), *1.0* m, Italy - 
> onshore and offshore.
>
> PROJ string:
> +proj=noop
>
>
> Does someone know if it is possible, using special options for cs2cs,  
> to achieve a transformation with an accuracy better than *1.0 m* ?
>
> Thanks in advance
> Antonio Valanzano
>
>
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