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<p>Torill,</p>
<p>the area of use of EPSG:1104 is <br>
</p>
<p> USAGE[<br>
SCOPE["Military survey."],<br>
AREA["Mali."],<br>
BBOX[10.14,-12.25,25.01,4.26]],<br>
<br>
</p>
<p>with this very interesting remark:</p>
<p> REMARK["Derived at 1 station connected to the Adindan (Blue
Nile 1958) network through the 1968-69 12th parallel traverse.
Accuracy 25m in each axis. Note: the Adindan (Blue Nile 1958) CRS
is used in Ethiopia and Sudan, not Mali."]]<br>
<br>
</p>
<p>The area of use of EPSG:4201 is</p>
<p> USAGE[<br>
SCOPE["Geodesy."],<br>
AREA["Eritrea; Ethiopia; South Sudan; Sudan."],<br>
BBOX[3.4,21.82,22.24,47.99]],<br>
</p>
<p>So there is no intersection between both, hence EPSG:1104 is
discarded.<br>
</p>
<p>Even<br>
</p>
<div class="moz-cite-prefix">Le 15/12/2023 à 12:01, Torill Kjøsnes
Gabrielsen via PROJ a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAE49LKx_3k3JJ5SUF40oG4NTM_Q7eHX447NGBFxWZ3UsoJKNFw@mail.gmail.com">
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<p class="MsoNormal"
style="margin:0cm;font-size:12pt;font-family:Calibri,sans-serif"><span
lang="EN-US">Hi,</span></p>
<p class="MsoNormal"
style="margin:0cm;font-size:12pt;font-family:Calibri,sans-serif"><span
lang="EN-US"> </span></p>
<p class="MsoNormal"
style="margin:0cm;font-size:12pt;font-family:Calibri,sans-serif"><span
lang="EN-US">I am
writing to inquire about the availability of the EPSG:1104
transformation in
PROJ 9.3.1 and 9.2. I have noticed that PROJ supports the
EPSG:1104 coordinate
operation method;</span><span lang="EN-US"> </span></p>
<p class="MsoNormal"
style="margin:0cm;font-size:12pt;font-family:Calibri,sans-serif"><span
lang="EN-US"><i>projinfo
</i><i>urn:ogc:def:coordinateOperation:EPSG::1104</i>. </span></p>
<p class="MsoNormal"
style="margin:0cm;font-size:12pt;font-family:Calibri,sans-serif"><span
lang="EN-US"> </span></p>
<p class="MsoNormal"
style="margin:0cm;font-size:12pt;font-family:Calibri,sans-serif"><span
lang="EN-US">However,
when I try to use this transformation in the projinfo
command for transformation
between coordinates expressed in EPSG:4201 and EPSG:4326,
the EPSG:1104 method
is not listed as a candidate; </span></p>
<p class="MsoNormal"
style="margin:0cm;font-size:12pt;font-family:Calibri,sans-serif"><span
lang="EN-US">projinfo -s 'EPSG:4201' -t 'EPSG:4326' -o PROJ
--spatial-test intersects --show-superseded</span></p>
<p class="MsoNormal"
style="margin:0cm;font-size:12pt;font-family:Calibri,sans-serif"><span
lang="EN-US"> </span></p>
<p class="MsoNormal"
style="margin:0cm;font-size:12pt;font-family:Calibri,sans-serif"><span
lang="EN-US">As far as I
know, the EPSG:1104 transformation is a valid 3-parameter
transformation and
should be applicable for transforming coordinates between
these two CRSs.
Therefore, I was wondering if there is a reason why this
transformation is not
listed as a candidate by the projinfo command.</span></p>
<p class="MsoNormal"
style="margin:0cm;font-size:12pt;font-family:Calibri,sans-serif"><span
lang="EN-US"> </span></p>
<p class="MsoNormal"
style="margin:0cm;font-size:12pt;font-family:Calibri,sans-serif"><span
lang="EN-US">Thanks for
your help and support.</span></p>
<p class="MsoNormal"
style="margin:0cm;font-size:12pt;font-family:Calibri,sans-serif"><span
lang="EN-US"> </span></p>
<p class="MsoNormal"
style="margin:0cm;font-size:12pt;font-family:Calibri,sans-serif"><span
lang="EN-US">Best
regards, </span></p>
<p class="MsoNormal"
style="margin:0cm;font-size:12pt;font-family:Calibri,sans-serif"><span
lang="EN-US">Torill Kjøsnes Gabrielsen</span></p>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
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</blockquote>
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