Hi Recently I found some vertical systems that do not cover properly the entire area they "should" cover (a country usually) but that their geoid models do.
One example I already posted here was in Canada for https://epsg.org/crs_5713/CGVD28-height.html We contacted them (thanks Even) and they will update EPSG and ISO databases to cover Newfoundland. https://lists.osgeo.org/pipermail/proj/2023-December/011203.html But I found more examples: This example from Switzerland for https://epsg.org/crs_5729/LHN95-height.html is not as significan (just a few hundred meters, but it surprising how they missed it in 3 of 4 sides) You can see them in this mini-GIS link (Just click the "squares" to fit to each "outlier" bounds) https://javier.jimenezshaw.com/mapas/?name=st&c=46.7511530,8.6243091&z=8&f=xtra1&b=osm&v=1&e=1&o=100&ed=1&m=&extra_name=swisstopo&extra_url=https%3A%2F%2Fwmts100.geo.admin.ch%2F1.0.0%2Fch.swisstopo.pixelkarte-farbe%2Fdefault%2Fcurrent%2F3857%2F%7Bz%7D%2F%7Bx%7D%2F%7By%7D.jpeg&d7=7mnpck,zgn5v,West,8,008000,3;0,snb&d7=7kse2q,1hopil,South,8,800080,3;f06,-hw&d7=7pjafh,1qgtba,East,8,ff00ff,3;-6k,-fzs&y7=7wncbk,zhfnk,Extent%20EPSG%3A1286,8,ff0000,3;-buixs,0;0,qyxpc;buixs,0&y7=7mo4q6,zheng,West,8,ffa500,3;-wle,bx;-9r7,-k1b;1u4,-2zb;rbd,-7m8;je8,ust&y7=7kspwk,1hmppz,South,8,000080,3;38c,-g9y;-20,2yab;-45l,-9rq;-adz,-2zb;-gm,-ijo;7pz,-lh6;5dl,-nn5&y7=7pj8of,1qgdhh,East,8,a68c2b,3;ka,ckf;198,387;-izq,lh;-ciw,-6n0;-6dc,-9lr&ga=0 Another example is Japan with https://epsg.org/crs_6695/JGD2011-vertical-height.html that does not include the island of Okinawa (among others), that is covered by the geoid model in PROJ-data. (here the distance is big. I didn't know that Japan reached 24 deg latitude) In Ireland they leave some islands out of https://epsg.org/crs_5731/Malin-Head-height.html in the west, like Munster, also covered by OGM15_Malin tiff file. *The problem* is that PROJ is not using the geoid model out of the area of use of the vertical CRS. One option is to contact the agencies to correct their area of use in EPSG (does anybody know how to contact Swiss, Japanese or Irish agencies in this case?). I have seen many EPSG updates that are just increasing 0.01 deg an extent. Would it make sense to be more flexible on the vertical transformations? Just contacting the local agencies is enough? Cheers, Javier. PS I am surprised that some countries do not pay more attention to the extent of their countries. I thought it was a geopolitical topic. .___ ._ ..._ .. . ._. .___ .. __ . _. . __.. ... .... ._ .__
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