Re: [Geotools-gt2-users] different towgs84 definitions for same authority datum code ("Amersfoort")?

[Mark P. <mc....@gm...>]

On 17-08-2023 13:39, Nikolai Fiikov wrote:
> hi,
> analysing content of
> /modules/plugin/epsg-wkt/src/main/resources/org/geotools/referencing/epsg/wkt/epsg.properties
> 
> i came across different towg84 definitions for DATUM "Amersfoort", 
> epsg:6289.
> see attached text file for space formatted comparison.
> 
> basically "28992=PROJCS["Amersfoort / RD New""
> has differences compared to rest (62896405, 4289, 28991, 7415 and 7408).
> 
> would anyone have an idea what is the story behind it?

I guess these are the values provided in v9.6 of the EPSG database that 
was used to update the files with 
https://github.com/geotools/geotools/pull/2479 described in 
https://osgeo-org.atlassian.net/browse/GEOT-5865

The values for 28992 are identical to those on https://epsg.io/28992

Note that epsg.io is not the authoritative party; but it is a far more 
accessible than the EPSG at 
https://epsg.org/crs_28992/Amersfoort-RD-New.html

Also note that 28992 has been redefined  as derived from ETRS89 whereas 
the others haven't afaik

-M