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Nicolas,
<blockquote type="cite"
cite="mid:1083739443.40922.1685984941609.JavaMail.zimbra@ign.fr">
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12pt; color: #000000"><br>
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<div>1) It seems that the entry <span style="color: rgba(0, 0,
0, 0.85); font-family: Menlo; font-size: 15px;">RGTAAF07UTM42S
has disappeared from the current IGNF dictionary</span></div>
</div>
</blockquote>
<p>It is no longer in
<a class="moz-txt-link-freetext" href="https://geodesie.ign.fr/contenu/fichiers/IGNF.xml">https://geodesie.ign.fr/contenu/fichiers/IGNF.xml</a> which is the
source (actually we use a slightly older version of IGNF.xml) from
the records ingested into the PROJ database:
<a class="moz-txt-link-freetext" href="https://github.com/OSGeo/PROJ/blob/master/data/sql/ignf.sql">https://github.com/OSGeo/PROJ/blob/master/data/sql/ignf.sql</a></p>
<p>IGN is of course welcome to take over maintenance of the registry
in PROJ: cf <a class="moz-txt-link-freetext" href="https://github.com/OSGeo/PROJ/issues/2682">https://github.com/OSGeo/PROJ/issues/2682</a><br>
</p>
<blockquote type="cite"
cite="mid:1083739443.40922.1685984941609.JavaMail.zimbra@ign.fr">
<div style="font-family: arial, helvetica, sans-serif; font-size:
12pt; color: #000000">
<div><span style="color: rgba(0, 0, 0, 0.85); font-family:
Menlo; font-size: 15px;"><br data-mce-bogus="1">
</span></div>
<div><span style="font-family: Menlo;"><span style="font-family:
Menlo;"><span style="color: rgba(0, 0, 0, 0.85);
font-size: 15px;" data-mce-style="color: rgba(0, 0, 0,
0.85); font-size: 15px;">2) It seems that the geoid
grid </span></span></span><span style="color: rgba(0, 0,
0, 0.85); font-family: Menlo; font-size: 15px;">fr_ign_RAR07_bl.tif </span><span
style="font-family: Menlo;"><span style="font-family:
Menlo;"><span style="color: rgba(0, 0, 0, 0.85);
font-size: 15px;" data-mce-style="color: rgba(0, 0, 0,
0.85); font-size: 15px;"><br>
</span></span></span><span style="font-family: Menlo;"><span
style="color: rgba(0, 0, 0, 0.85); font-size: 15px;"
data-mce-style="color: rgba(0, 0, 0, 0.85); font-size:
15px;">is missing for the definition of :</span></span></div>
<div>
<p style="margin: 0px; font-style: normal; font-variant-caps:
normal; font-weight: normal; font-stretch: normal;
font-size: 15px; line-height: normal; font-family: Menlo;
color: rgba(0, 0, 0, 0.85); background-color: rgb(255, 255,
255);" data-mce-style="margin: 0px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
font-stretch: normal; font-size: 15px; line-height: normal;
font-family: Menlo; color: rgba(0, 0, 0, 0.85);
background-color: #ffffff;">REUN47GAUSSL</p>
<p style="margin: 0px; font-style: normal; font-variant-caps:
normal; font-weight: normal; font-stretch: normal;
font-size: 15px; line-height: normal; font-family: Menlo;
color: rgba(0, 0, 0, 0.85); background-color: rgb(255, 255,
255);" data-mce-style="margin: 0px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
font-stretch: normal; font-size: 15px; line-height: normal;
font-family: Menlo; color: rgba(0, 0, 0, 0.85);
background-color: #ffffff;">RGR92UTM40S</p>
<p style="margin: 0px; font-style: normal; font-variant-caps:
normal; font-weight: normal; font-stretch: normal;
font-size: 15px; line-height: normal; font-family: Menlo;
color: rgba(0, 0, 0, 0.85); background-color: rgb(255, 255,
255);" data-mce-style="margin: 0px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
font-stretch: normal; font-size: 15px; line-height: normal;
font-family: Menlo; color: rgba(0, 0, 0, 0.85);
background-color: #ffffff;">REUN47GEO</p>
<p style="margin: 0px; font-style: normal; font-variant-caps:
normal; font-weight: normal; font-stretch: normal;
font-size: 15px; line-height: normal; font-family: Menlo;
color: rgba(0, 0, 0, 0.85); background-color: rgb(255, 255,
255);" data-mce-style="margin: 0px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
font-stretch: normal; font-size: 15px; line-height: normal;
font-family: Menlo; color: rgba(0, 0, 0, 0.85);
background-color: #ffffff;">RGR92GEO</p>
</div>
</div>
</blockquote>
<p>In the new ISO191111-based paradygm (which is also more or less
the one followed by the IGNF.xml file), a grid is not part of a
CRS definition. Grids can be referenced by transformations.</p>
<p>e.g</p>
<p>bin/projinfo -s IGNF:RGR92GEO -t IGNF:REUN89<br>
Candidate operations found: 1<br>
-------------------------------------<br>
Operation No. 1:<br>
<br>
DERIVED_FROM(IGNF):TSG1160, RGR92 (RESEAU GEODESIQUE DE LA REUNION
1992) vers IGN 1989 (REUNION), unknown accuracy, ILE DE LA
REUNION, at least one grid missing<br>
<br>
PROJ string:<br>
+proj=pipeline<br>
+step +proj=unitconvert +xy_in=deg +xy_out=rad<br>
+step +inv +proj=vgridshift +grids=fr_ign_RAR07_bl.tif
+multiplier=1<br>
+step +proj=unitconvert +xy_in=rad +xy_out=deg<br>
</p>
<p>which directly uses the IGNF:TSG1160 transformation of IGNF.xml<br>
<br>
</p>
<blockquote type="cite"
cite="mid:1083739443.40922.1685984941609.JavaMail.zimbra@ign.fr">
<div style="font-family: arial, helvetica, sans-serif; font-size:
12pt; color: #000000">
<div>
<p style="margin: 0px; font-style: normal; font-variant-caps:
normal; font-weight: normal; font-stretch: normal;
font-size: 15px; line-height: normal; font-family: Menlo;
color: rgba(0, 0, 0, 0.85); background-color: rgb(255, 255,
255);" data-mce-style="margin: 0px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
font-stretch: normal; font-size: 15px; line-height: normal;
font-family: Menlo; color: rgba(0, 0, 0, 0.85);
background-color: #ffffff;"><br data-mce-bogus="1">
</p>
<div style="caret-color: #000000; color: #000000; font-family:
arial, helvetica, sans-serif; font-size: 16px; 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; background-color:
#ffffff; text-decoration: none;"
data-mce-style="caret-color: #000000; color: #000000;
font-family: arial, helvetica, sans-serif; font-size: 16px;
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; background-color: #ffffff; text-decoration: none;"><span
style="font-family: Menlo;" data-mce-style="font-family:
Menlo;"><span style="font-family: Menlo;"
data-mce-style="font-family: Menlo;"><span
data-mce-style="color: rgba(0, 0, 0, 0.85); font-size:
15px;" style="color: rgba(0, 0, 0, 0.85); font-size:
15px;">3) It seems that the geoid grid fr_ign_1.tif</span></span></span><span
style="font-family: Menlo;" data-mce-style="font-family:
Menlo;"><span data-mce-style="color: rgba(0, 0, 0, 0.85);
font-size: 15px;" style="color: rgba(0, 0, 0, 0.85);
font-size: 15px;"><br>
</span></span><span style="font-family: Menlo;"
data-mce-style="font-family: Menlo;"><span
data-mce-style="color: rgba(0, 0, 0, 0.85); font-size:
15px;" style="color: rgba(0, 0, 0, 0.85); font-size:
15px;">is missing for the definition of :</span></span></div>
<div style="caret-color: #000000; color: #000000; font-family:
arial, helvetica, sans-serif; font-size: 16px; 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; background-color:
#ffffff; text-decoration: none;"
data-mce-style="caret-color: #000000; color: #000000;
font-family: arial, helvetica, sans-serif; font-size: 16px;
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; background-color: #ffffff; text-decoration: none;">
<p style="margin: 0px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
font-stretch: normal; font-size: 15px; line-height:
normal; font-family: Menlo; color: rgba(0, 0, 0, 0.85);
background-color: rgb(255, 255, 255);"
data-mce-style="margin: 0px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
font-stretch: normal; font-size: 15px; line-height:
normal; font-family: Menlo; color: rgba(0, 0, 0, 0.85);
background-color: #ffffff;">STPM50UTM21</p>
<p style="margin: 0px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
font-stretch: normal; font-size: 15px; line-height:
normal; font-family: Menlo; color: rgba(0, 0, 0, 0.85);
background-color: rgb(255, 255, 255);"
data-mce-style="margin: 0px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
font-stretch: normal; font-size: 15px; line-height:
normal; font-family: Menlo; color: rgba(0, 0, 0, 0.85);
background-color: #ffffff;">RGSPM06GEO</p>
<p style="margin: 0px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
font-stretch: normal; font-size: 15px; line-height:
normal; font-family: Menlo; color: rgba(0, 0, 0, 0.85);
background-color: rgb(255, 255, 255);"
data-mce-style="margin: 0px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
font-stretch: normal; font-size: 15px; line-height:
normal; font-family: Menlo; color: rgba(0, 0, 0, 0.85);
background-color: #ffffff;">STPM50GEO</p>
<p style="margin: 0px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
font-stretch: normal; font-size: 15px; line-height:
normal; font-family: Menlo; color: rgba(0, 0, 0, 0.85);
background-color: rgb(255, 255, 255);"
data-mce-style="margin: 0px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
font-stretch: normal; font-size: 15px; line-height:
normal; font-family: Menlo; color: rgba(0, 0, 0, 0.85);
background-color: #ffffff;">RGSPM06U21</p>
</div>
</div>
</div>
</blockquote>
<p>Same here:</p>
<p>$ bin/projinfo -s IGNF:RGSPM06GEO -t IGNF:STPM50_V<br>
Candidate operations found: 1<br>
-------------------------------------<br>
Operation No. 1:<br>
<br>
DERIVED_FROM(IGNF):TSG1156, RGSPM06 (RESEAU GEODESIQUE DE
SAINT-PIERRE-ET-MIQUELON 2006) vers DANGER 1950
(SAINT-PIERRE-ET-MIQUELON), unknown accuracy,
SAINT-PIERRE-ET-MIQUELON, at least one grid missing<br>
<br>
PROJ string:<br>
+proj=pipeline<br>
+step +proj=unitconvert +xy_in=deg +xy_out=rad<br>
+step +inv +proj=vgridshift +grids=fr_ign_ggspm06v1.tif
+multiplier=1<br>
+step +proj=unitconvert +xy_in=rad +xy_out=deg<br>
<br>
</p>
<p>Even</p>
<br>
<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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