<div dir="ltr"><div>Thank you Even.</div><div>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.</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, 11 Mar 2026 at 22:04, Even Rouault <<a href="mailto:even.rouault@spatialys.com">even.rouault@spatialys.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
<div>
<p>Javier,</p>
<p>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</p>
<p>Even</p>
<div>Le 10/03/2026 à 16:43, Javier Jimenez
Shaw via PROJ a écrit :<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Hi</div>
<div><br>
</div>
<div>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)</div>
<div><br>
</div>
<div>Note: I do not want to change it, just to understand it.</div>
<div><br>
</div>
<div>Context: Going from <a>EPSG:4258</a> (--3d) to <a>EPSG:5514+8357</a> 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</div>
<div><br>
</div>
<div>The difference is going from <a>EPSG:4326</a> (--3d)
to <a>EPSG:5514+8357</a>. 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)</div>
<div><br>
</div>
<div>What changed? PROJ, EPSG, both?</div>
<div><br>
</div>
<div>Thank you.</div>
<div>Javier</div>
<div><br>
</div>
<div><span style="font-family:arial,sans-serif">PROJ 9.8.0:</span></div>
<div><span style="font-family:monospace">PROJ_NETWORK=ON
./proj_9.8.0/bin/projinfo <a>EPSG:4326</a> <a>EPSG:5514+8357</a> --3d
--spatial-test intersects --bbox 15,50,15.1,50.1 -o proj |
head -n 40<br>
Candidate operations found: 12<br>
-------------------------------------<br>
Operation No. 1:<br>
<br>
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
(<a>EPSG:5514</a>) to S-JTSK/05 / Modified Krovak East North
(<a>EPSG:5516</a>) + Inverse of Krovak East North (Greenwich) +
Krovak East North (Greenwich), 1.065 m, Czechia.</span></div>
<div><span style="font-family:monospace"><br>
</span></div>
<div><span style="font-family:monospace">... pipeline omitted.
It uses cz_cuzk_CR-2005.tif
and cz_cuzk_table_-y-x_3_v1710.tif </span></div>
<div><span style="font-family:monospace"><br>
</span></div>
<div><span style="font-family:arial,sans-serif">PROJ 9.7.1:</span></div>
<div><span style="font-family:monospace">PROJ_NETWORK=ON
./proj_9.7.1/bin/projinfo <a>EPSG:4326</a> <a>EPSG:5514+8357</a> --3d
--spatial-test intersects --bbox 15,50,15.1,50.1 -o proj |
head -n 40<br>
Candidate operations found: 7<br>
-------------------------------------<br>
Operation No. 1:<br>
<br>
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.<br>
<br>
... pipeline omitted. It only uses cz_cuzk_CR-2005.tif</span></div>
<div><span style="font-family:monospace"><br>
</span></div>
<div><span style="font-family:monospace"><br>
</span></div>
<div><span style="font-family:arial,sans-serif">As a reference,
from <a>EPSG:4258</a> it doing this</span></div>
<div><span style="font-family:monospace"><br>
</span></div>
<div><span style="font-family:monospace">PROJ_NETWORK=ON
./proj_9.8.0/bin/projinfo <a>EPSG:4258</a> <a>EPSG:5514+8357</a> --3d
--spatial-test intersects --bbox 15,50,15.1,50.1 -o proj |
head -n 40<br>
Candidate operations found: 10<br>
-------------------------------------<br>
Operation No. 1:<br>
<br>
<a>PROJ:ETRS89_3D_TO_S_JTSK_E_N_BALTIC_HEIGHT</a>, ETRS89 to S-JTSK
/ Krovak East North + Baltic 1957 height, 0.05 m, Czechia.</span></div>
<div>
<div><span style="font-family:monospace"><br>
</span></div>
<div><span style="font-family:monospace">... pipeline omitted.
It uses cz_cuzk_CR-2005.tif
and cz_cuzk_table_-y-x_3_v1710.tif </span></div>
<div><span style="font-family:monospace"><br>
<br>
</span></div>
<span style="font-family:monospace"><br>
</span></div>
<div><br>
</div>
</div>
<br>
<fieldset></fieldset>
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