[PROJ] World area of use

[Even Rouault]

Hi Javier,

I don't know the reason for the difference, but if there's one, it would 
be interesting to know, and if there's none, converging to World 
(without country list, extent 1262) would indeed seem better. Looking at 
the few instances that use World by country (extent 2830), there is no 
apparent logic. It isn't even related to the type (geographic 2D vs 3D 
vs geocentric).

Grep'ping in the change items of the registry (grep epsg_change 
PostgreSQL_Data_Script.sql | grep 1262 | grep 2830), shows a global 
trend of moving from 2830 to 1262 (with a interesting back & forth for 
CRS 8227, IGS14 geocentric, which was changed from 1262 to 2830, and 
then later back to 1262)

Even

Le 30/12/2023 à 19:54, Javier Jimenez Shaw via PROJ a écrit :
> Hi
>
> Playing with crs-explorer, I found that there are a few (and only a 
> few) CRSs with an endless "area of use" description:
> https://crs-explorer.proj.org/?latlng=-45.435465,-15.468750&ignoreWorld=false&allowDeprecated=false&authorities=EPSG&activeTypes=GEOGRAPHIC_2D_CRS,GEOGRAPHIC_3D_CRS,GEOCENTRIC_CRS 
> <https://crs-explorer.proj.org/?latlng=-45.435465,-15.468750&ignoreWorld=false&allowDeprecated=false&authorities=EPSG&activeTypes=GEOGRAPHIC_2D_CRS,GEOGRAPHIC_3D_CRS,GEOCENTRIC_CRS>
>
> In EPSG called "World (by country)" 
> https://epsg.org/extent_2830/World-by-country.html
>
> like
> EPSG:4326 <https://epsg.org/crs_4326/WGS-84.html> 	WGS 84
>
> EPSG:9754 <https://epsg.org/crs_9754/WGS-84-G2139-.html> 	WGS 84 (G2139)
>
> EPSG:9988 <https://epsg.org/crs_9988/ITRF2020.html> 	ITRF2020
>
> EPSG:10176 <https://epsg.org/crs_10176/IGS20.html> 	IGS20
>
>
> but not some other implementations like
> EPSG:4978 <https://epsg.org/crs_4978/WGS-84.html> 	WGS 84
>
> EPSG:9753 <https://epsg.org/crs_9753/WGS-84-G2139-.html> 	WGS 84 (G2139)
>
> EPSG:9055 <https://epsg.org/crs_9055/WGS-84-G1150-.html> 	WGS 84 (G1150)
>
>
> (yes, same CRS. The difference is Geographic 2D vs 3D vs geocentric)
>
> Do you know why this difference?
> Is it something to communicate to EPSG?
> I personally think that that endless list of countries is not needed 
> when there is a "World" at front.
>
> Cheers and happy new year.
> .___ ._ ..._ .. . ._.  .___ .. __ . _. . __..  ... .... ._ .__
>
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