Thank you Even. I was not aware of those changes... it is easy to miss something on the EPSG updates. The same way I missed the new German CRS from 2025.
On Wed, 11 Mar 2026 at 22:04, Even Rouault <[email protected]> wrote: > Javier, > > I suspect this is due to commit 3717ff00afa6872a2ae581de929ba5559ff84438 > where I tweaked transformations_czechia.sql, presumably to make existing > tests pass following to the addition of "ETRS89-CZE [2007]". Only a git > bisect session would confirm > > Even > Le 10/03/2026 à 16:43, Javier Jimenez Shaw via PROJ a écrit : > > Hi > > This change in behaviour is a surprise to me. I would like to know what > changed (I know the ETRS89 datum ensemble, but I was not expecting this > consequence) > > Note: I do not want to change it, just to understand it. > > Context: Going from EPSG:4258 (--3d) to EPSG:5514+8357 is using > both cz_cuzk_CR-2005.tif and cz_cuzk_table_-y-x_3_v1710.tif in 9.7.1 and > 9.8.0 > > The difference is going from EPSG:4326 (--3d) to EPSG:5514+8357. In 9.7.1 > it is not using cz_cuzk_table_-y-x_3_v1710.tif, but in 9.8.0 it does. (both > use cz_cuzk_CR-2005.tif) > > What changed? PROJ, EPSG, both? > > Thank you. > Javier > > PROJ 9.8.0: > PROJ_NETWORK=ON ./proj_9.8.0/bin/projinfo EPSG:4326 EPSG:5514+8357 --3d > --spatial-test intersects --bbox 15,50,15.1,50.1 -o proj | head -n 40 > Candidate operations found: 12 > ------------------------------------- > Operation No. 1: > > unknown id, Inverse of ETRS89-CZE [2007] to WGS 84 (1) + ETRS89-CZE [2007] > to Baltic 1957 height (2) + Inverse of S-JTSK/05 to ETRS89-CZE [2007] (1) + > Modified Krovak East North (Greenwich) + Inverse of S-JTSK / Krovak East > North (EPSG:5514) to S-JTSK/05 / Modified Krovak East North (EPSG:5516) + > Inverse of Krovak East North (Greenwich) + Krovak East North (Greenwich), > 1.065 m, Czechia. > > ... pipeline omitted. It uses cz_cuzk_CR-2005.tif > and cz_cuzk_table_-y-x_3_v1710.tif > > PROJ 9.7.1: > PROJ_NETWORK=ON ./proj_9.7.1/bin/projinfo EPSG:4326 EPSG:5514+8357 --3d > --spatial-test intersects --bbox 15,50,15.1,50.1 -o proj | head -n 40 > Candidate operations found: 7 > ------------------------------------- > Operation No. 1: > > unknown id, Inverse of ETRS89 to WGS 84 (1) + ETRS89 to Baltic 1957 height > (2) + Inverse of S-JTSK to ETRS89 (1) + Krovak East North (Greenwich), 2.03 > m, Czechia. > > ... pipeline omitted. It only uses cz_cuzk_CR-2005.tif > > > As a reference, from EPSG:4258 it doing this > > PROJ_NETWORK=ON ./proj_9.8.0/bin/projinfo EPSG:4258 EPSG:5514+8357 --3d > --spatial-test intersects --bbox 15,50,15.1,50.1 -o proj | head -n 40 > Candidate operations found: 10 > ------------------------------------- > Operation No. 1: > > PROJ:ETRS89_3D_TO_S_JTSK_E_N_BALTIC_HEIGHT, ETRS89 to S-JTSK / Krovak > East North + Baltic 1957 height, 0.05 m, Czechia. > > ... pipeline omitted. It uses cz_cuzk_CR-2005.tif > and cz_cuzk_table_-y-x_3_v1710.tif > > > > > > _______________________________________________ > PROJ mailing > [email protected]https://lists.osgeo.org/mailman/listinfo/proj > > -- http://www.spatialys.com > My software is free, but my time generally not. > >
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