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<p>Ah, and you should avoid using the "+init=" prefix. This is a
deprecated legacy syntax that doesn't enforce axis order of the
CRS definition (without practical consequence for IGNF: CRS since
they use "GIS friendly" axis order)<br>
</p>
<p>To help debugging this, please provide the output of:<br>
</p>
<p>PROJ_DEBUG=3 projinfo -s IGNF:LAMB93 -t IGNF:RGF93 -o PROJ<br>
</p>
<p>On my system I get:<br>
</p>
<p>pj_open_lib(proj.ini): call
fopen(/home/even/proj/install-proj-master/share/proj/proj.ini) -
succeeded<br>
pj_open_lib(proj.db): call
fopen(/home/even/proj/install-proj-master/share/proj/proj.db) -
succeeded<br>
Candidate operations found: 1<br>
-------------------------------------<br>
Operation No. 1:<br>
<br>
unknown id, Inverse of LAMBERT-93 + Conversion from RGF93
geographiques (dms) to RGF93 cartesiennes geocentriques, 0 m,
World<br>
<br>
PROJ string:<br>
+proj=pipeline<br>
+step +inv +proj=lcc +lat_0=46.5 +lon_0=3 +lat_1=44 +lat_2=49
+x_0=700000<br>
+y_0=6600000 +ellps=GRS80<br>
+step +proj=cart +ellps=GRS80<br>
<br>
</p>
<div class="moz-cite-prefix">Le 26/05/2023 à 21:46, Even Rouault a
écrit :<br>
</div>
<blockquote type="cite"
cite="mid:011ed301-0b81-9d3c-f811-53cd86410274@spatialys.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Hi,</p>
<p>I get the expected 4070327.25 166078.93 4891298.61 result with
proj 6.0.0, 7.2.1, 9.2.0 and master</p>
<p>There's no grid involved in this operation, just inverse LCC
projection on the RGF93 datum</p>
<p>I also tried to reproduce your issue if the PROJ < 6 IGNF
file is found in the PROJ resource path(s) (non nominal
situation - this file is not needed any more, and will generally
lead to suboptimal results. Its content is included in the
proj.db file), but even with that I get the expected result. So
no idea why you get wrong results<br>
</p>
<p>Even</p>
<p><br>
</p>
<div class="moz-cite-prefix">Le 26/05/2023 à 20:54, Nicolas
Bellaiche a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:1554747504.7324762.1685127274306.JavaMail.zimbra@ign.fr">
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
<div style="font-family: arial, helvetica, sans-serif;
font-size: 12pt; color: #000000">
<div>Hi all,</div>
<div><br data-mce-bogus="1">
</div>
<div>I'm migrating my C++ code from PROJ4 to PROJ9 and I meet
a worrying issue with the computation. Some of my regress
tests don't pass so I've tested with cs2cs and gets the same
difference:</div>
<div><br data-mce-bogus="1">
</div>
<div>
<p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo;"
data-mce-style="caret-color: #000000; color: #000000;
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo;"><span
class="Apple-converted-space">PROJ4</span></p>
<p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo;"
data-mce-style="caret-color: #000000; color: #000000;
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo;"><span
class="Apple-converted-space"> </span>echo<span
class="Apple-converted-space"> </span><span
class="Object" role="link"
id="OBJ_PREFIX_DWT157_com_zimbra_phone" style="color:
#005a95; text-decoration: none; cursor: pointer;"
data-mce-style="color: #005a95; text-decoration: none;
cursor: pointer;"><a href="callto:652760.73700000"
style="color: #005a95; text-decoration: none; cursor:
pointer;" data-mce-href="callto:652760.73700000"
data-mce-style="color: #005a95; text-decoration: none;
cursor: pointer;" moz-do-not-send="true">652760.73700000</a></span><span
class="Apple-converted-space"> </span><span
class="Object" role="link"
id="OBJ_PREFIX_DWT158_com_zimbra_phone" style="color:
#005a95; text-decoration: none; cursor: pointer;"
data-mce-style="color: #005a95; text-decoration: none;
cursor: pointer;"><a href="callto:7033791.24300000 43"
style="color: #005a95; text-decoration: none; cursor:
pointer;" data-mce-href="callto:7033791.24300000 43"
data-mce-style="color: #005a95; text-decoration: none;
cursor: pointer;" moz-do-not-send="true">7033791.24300000
43</a></span>.64200000 | cs2cs +init=IGNF:LAMB93 +to
+init=IGNF:RGF93: </p>
<p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo;"
data-mce-style="caret-color: #000000; color: #000000;
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo;">4070327.25<span class="Apple-tab-span" style="white-space: pre;" data-mce-style="white-space: pre;"> </span><span
class="Object" role="link"
id="OBJ_PREFIX_DWT159_com_zimbra_phone" style="color:
#005a95; text-decoration: none; cursor: pointer;"
data-mce-style="color: #005a95; text-decoration: none;
cursor: pointer;"><a href="callto:166078.93 4891298.61"
style="color: #005a95; text-decoration: none; cursor:
pointer;" data-mce-href="callto:166078.93 4891298.61"
data-mce-style="color: #005a95; text-decoration: none;
cursor: pointer;" moz-do-not-send="true">166078.93
4891298.61</a></span></p>
<p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo; min-height:
13px;" data-mce-style="caret-color: #000000; color:
#000000; font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo; min-height:
13px;"><br>
</p>
<p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo; min-height:
13px;" data-mce-style="caret-color: #000000; color:
#000000; font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo; min-height:
13px;">PROJ7 or PROJ9</p>
<p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo;"
data-mce-style="caret-color: #000000; color: #000000;
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo;"><span
class="Apple-converted-space"> </span>echo<span
class="Apple-converted-space"> </span><span
class="Object" role="link"
id="OBJ_PREFIX_DWT160_com_zimbra_phone" style="color:
#005a95; text-decoration: none; cursor: pointer;"
data-mce-style="color: #005a95; text-decoration: none;
cursor: pointer;"><a href="callto:652760.73700000"
style="color: #005a95; text-decoration: none; cursor:
pointer;" data-mce-href="callto:652760.73700000"
data-mce-style="color: #005a95; text-decoration: none;
cursor: pointer;" moz-do-not-send="true">652760.73700000</a></span><span
class="Apple-converted-space"> </span><span
class="Object" role="link"
id="OBJ_PREFIX_DWT161_com_zimbra_phone" style="color:
#005a95; text-decoration: none; cursor: pointer;"
data-mce-style="color: #005a95; text-decoration: none;
cursor: pointer;"><a href="callto:7033791.24300000 43"
style="color: #005a95; text-decoration: none; cursor:
pointer;" data-mce-href="callto:7033791.24300000 43"
data-mce-style="color: #005a95; text-decoration: none;
cursor: pointer;" moz-do-not-send="true">7033791.24300000
43</a></span>.64200000 | cs2cs +init=IGNF:LAMB93 +to
+init=IGNF:RGF93:<span class="Apple-converted-space"> </span></p>
<p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo;"
data-mce-style="caret-color: #000000; color: #000000;
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo;">4070355.05<span class="Apple-tab-span" style="white-space: pre;" data-mce-style="white-space: pre;"> </span><span
class="Object" role="link"
id="OBJ_PREFIX_DWT162_com_zimbra_phone" style="color:
#005a95; text-decoration: none; cursor: pointer;"
data-mce-style="color: #005a95; text-decoration: none;
cursor: pointer;"><a href="callto:166080.07 4891332.24"
style="color: #005a95; text-decoration: none; cursor:
pointer;" data-mce-href="callto:166080.07 4891332.24"
data-mce-style="color: #005a95; text-decoration: none;
cursor: pointer;" moz-do-not-send="true">166080.07
4891332.24</a></span></p>
<p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo;"
data-mce-style="caret-color: #000000; color: #000000;
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo;"><span
class="Object" role="link" style="color: #005a95;
text-decoration: none; cursor: pointer;"
data-mce-style="color: #005a95; text-decoration: none;
cursor: pointer;"><br data-mce-bogus="1">
</span></p>
<p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo;"
data-mce-style="caret-color: #000000; color: #000000;
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;
margin: 0px; font-stretch: normal; font-size: 11px;
line-height: normal; font-family: menlo;"><span
class="Object" role="link" style="color: #005a95;
text-decoration: none; cursor: pointer;"
data-mce-style="color: #005a95; text-decoration: none;
cursor: pointer;"><br data-mce-bogus="1">
</span></p>
</div>
<div><br data-mce-bogus="1">
</div>
<div>I suspect that PROJ7 and PROJ9 don't read properly the
geoid file but I'm not sure. Someone can help me tracking
and fixing this problem?</div>
<div><br>
Thanks,</div>
<div><br data-mce-bogus="1">
</div>
<div>Nicolas Bellaiche</div>
<div>Institut Géographique National France</div>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
PROJ mailing list
<a class="moz-txt-link-abbreviated moz-txt-link-freetext" href="mailto:PROJ@lists.osgeo.org" moz-do-not-send="true">PROJ@lists.osgeo.org</a>
<a class="moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/proj" moz-do-not-send="true">https://lists.osgeo.org/mailman/listinfo/proj</a>
</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
<a class="moz-txt-link-freetext" href="http://www.spatialys.com" moz-do-not-send="true">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
PROJ mailing list
<a class="moz-txt-link-abbreviated" href="mailto:PROJ@lists.osgeo.org">PROJ@lists.osgeo.org</a>
<a class="moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/proj">https://lists.osgeo.org/mailman/listinfo/proj</a>
</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
<a class="moz-txt-link-freetext" href="http://www.spatialys.com">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
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