Thanks Melita That shows that there is some intention there, not just two extents used randomly (that was the impression). Me personally I would use always the "short" extent, 1262. The long list of all countries is redundant and extremely verbose for me.
Best regards, Javier. On Tue, 30 Jan 2024 at 19:58, Melita Kennedy via PROJ <[email protected]> wrote: > Hello Javier, > > Disclosure: I'm a member of the subcommittee that maintains the EPSG > registry. I also work for Esri. > > I'm sorry that I took so long to respond. I haven't been keeping up with > the list. My colleague, Bojan, had forwarded your message to me but it > while I was on vacation and got buried. > > You can sometimes find information about why the subcommittee makes > certain decisions in the Guidance Notes, > https://epsg.org/guidance-notes.html > > Guidance Note 7-6 is EPSG policies and procedures for EPSG Dataset data > management, documents strategy for populating the EPSG Dataset. > > It includes a small section on extents with this bit about World extents: > > "There are two extent records for the whole world, code 2830 includes and > code 1262 excludes, the names of all countries. The description for 2830 is > lengthy -- over 3000 characters. It is used for entities that might be > wanted from a text string using country name. Code 1262 is used when a > short description is appropriate." > > Do you feel we should expand the section or double-check that the choice > of extent code is consistent? Feel free to ask me to bring it up to the > subcommittee or send an email yourself using the online form at > https://epsg.org/contact.html. > > It's also tied to an option you have when logged in, "Include World > Items". We recently discussed whether to move more objects in/out of that > category like the ITRF definitions. > > Regards, > Melita > > -- > Melita Kennedy > Principal Product Engineer > Esri, Inc. > [email protected] > > ====================================================== > > > From: PROJ <[email protected] (mailto: > [email protected])> On Behalf Of Even Rouault via PROJ > Sent: Saturday, December 30, 2023 11:18 AM > To: Javier Jimenez Shaw <[email protected] (mailto:[email protected])>; > proj <[email protected] (mailto:[email protected])> > Subject: Re: [PROJ] World area of use > > 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: > ?latlng=-45.435465,-15.468750&ignoreWorld=false&allowDeprecated=false&authorities=EPSG&activeTypes=GEOGRAPHIC_2D_CRS,GEOGRAPHIC_3D_CRS,GEOCENTRIC_CRS > [crs-explorer.proj.org] (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://urldefense.com/v3/__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__;!!CKZwjTOV!2uziJJtS5R3htvY33qmdDN1rJ-yl23YUiU7NAtFcJgQ3laCDfCl5lFah7a66_RTDPzQIdD-o6GRn$ > )) > > In EPSG called "World (by country)" World-by-country.html [epsg.org] > (https:/epsg.org/extent_2830/World-by-country.html ( > https://urldefense.com/v3/__https:/epsg.org/extent_2830/World-by-country.html__;!!CKZwjTOV!2uziJJtS5R3htvY33qmdDN1rJ-yl23YUiU7NAtFcJgQ3laCDfCl5lFah7a66_RTDPzQIdPBiEOeG$ > )) > > like > EPSG:4326 [epsg.org] (https:/epsg.org/crs_4326/WGS-84.html ( > https://urldefense.com/v3/__https:/epsg.org/crs_4326/WGS-84.html__;!!CKZwjTOV!2uziJJtS5R3htvY33qmdDN1rJ-yl23YUiU7NAtFcJgQ3laCDfCl5lFah7a66_RTDPzQIdJmPB8XQ$ > )) > WGS 84 > EPSG:9754 [epsg.org] (https:/epsg.org/crs_9754/WGS-84-G2139-.html ( > https://urldefense.com/v3/__https:/epsg.org/crs_9754/WGS-84-G2139-.html__;!!CKZwjTOV!2uziJJtS5R3htvY33qmdDN1rJ-yl23YUiU7NAtFcJgQ3laCDfCl5lFah7a66_RTDPzQIdBTV_bnb$ > )) > WGS 84 (G2139) > > > EPSG:9988 [epsg.org] (https:/epsg.org/crs_9988/ITRF2020.html ( > https://urldefense.com/v3/__https:/epsg.org/crs_9988/ITRF2020.html__;!!CKZwjTOV!2uziJJtS5R3htvY33qmdDN1rJ-yl23YUiU7NAtFcJgQ3laCDfCl5lFah7a66_RTDPzQIdEgAvj6T$ > )) > ITRF2020 > > > EPSG:10176 [epsg.org] (https:/epsg.org/crs_10176/IGS20.html ( > https://urldefense.com/v3/__https:/epsg.org/crs_10176/IGS20.html__;!!CKZwjTOV!2uziJJtS5R3htvY33qmdDN1rJ-yl23YUiU7NAtFcJgQ3laCDfCl5lFah7a66_RTDPzQIdAY_9M5R$ > )) > IGS20 > > but not some other implementations like > EPSG:4978 [epsg.org] (https:/epsg.org/crs_4978/WGS-84.html ( > https://urldefense.com/v3/__https:/epsg.org/crs_4978/WGS-84.html__;!!CKZwjTOV!2uziJJtS5R3htvY33qmdDN1rJ-yl23YUiU7NAtFcJgQ3laCDfCl5lFah7a66_RTDPzQIdOxjP9Ib$ > )) > WGS 84 > EPSG:9753 [epsg.org] (https:/epsg.org/crs_9753/WGS-84-G2139-.html ( > https://urldefense.com/v3/__https:/epsg.org/crs_9753/WGS-84-G2139-.html__;!!CKZwjTOV!2uziJJtS5R3htvY33qmdDN1rJ-yl23YUiU7NAtFcJgQ3laCDfCl5lFah7a66_RTDPzQIdDXobqfV$ > )) > WGS 84 (G2139) > > > EPSG:9055 [epsg.org] (https:/epsg.org/crs_9055/WGS-84-G1150-.html ( > https://urldefense.com/v3/__https:/epsg.org/crs_9055/WGS-84-G1150-.html__;!!CKZwjTOV!2uziJJtS5R3htvY33qmdDN1rJ-yl23YUiU7NAtFcJgQ3laCDfCl5lFah7a66_RTDPzQIdBVfUA7V$ > )) > 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. > .___ ._ ..._ .. . ._. .___ .. __ . _. . __.. ... .... ._ .__ > > _______________________________________________ > PROJ mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/proj >
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