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<p>Bashkim,</p>
<p>From some tests, PROJ master with the latest EPSG update (and
thus QGIS for versions that will use it) should use the EPSG:6206
transformation by default for CRS 6204 and 9945. I've also just
queued an improvement in <a class="moz-txt-link-freetext" href="https://github.com/OSGeo/PROJ/pull/3158">https://github.com/OSGeo/PROJ/pull/3158</a>
for the generation of PROJ.4 string for those CRSs, but that
should not really impact QGIS use</p>
<p>EPSG:6316 is a more difficult case because this CRS has 2
usages/extents:</p>
<p> USAGE[<br>
SCOPE["Cadastre, engineering survey, topographic mapping
(large and medium scale)."],<br>
AREA["Bosnia and Herzegovina - east of 19°30'E; Kosovo;
Montenegro - east of 19°30'E; Serbia - between 19°30'E and
22°30'E."],<br>
BBOX[41.85,19.5,46.18,22.5]],<br>
USAGE[<br>
SCOPE["Cadastre."],<br>
AREA["North Macedonia."],<br>
BBOX[40.85,20.45,42.36,23.04]],<br>
</p>
<p>PROJ internals (especially the part that "computes"
transformation pipeline) only use one single usage/extent in part
of logics that are extent base, and this must be the first one
listed, hence not North Macedonia. And even if both would be
considered, selecting EPSG:6206 as a default transformation
wouldn't be appropriate for the non-North Macedonia usage.<br>
</p>
<p>Even<br>
</p>
<div class="moz-cite-prefix">Le 06/04/2022 à 16:48, Bashkim IDRIZI
via PROJ a écrit :<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal">Dear All, <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">First let me to introduce myself. I am
Bashkim Idrizi from North Macedonia. Lecturer of cartography
and GIS in geodesy department. <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Recently on March 18, three changes have
been made by our request in EPSG registry database (epsg.org,
2022.009), concerning to CRS of North Macedonia. Based on new
updates, there are three CRSs’ for North Macedonian CRS: 6204,
6316 and 9945. <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Next step toward elimination of problems
with usage of CRS’s for North Macedonian spatial data, is
defining single default datum transformation for three CRS’s
(6204, 6316 and 9945), based on EPSG 6206 for datum
transformation between MGI 1901 and WGS84. <o:p></o:p></p>
<p class="MsoNormal">This is very important for GIS users in our
country, because at this moment, overlapping with open data
such google map etc., is with very very low accuracy. <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">My request is to create three proj strings
as default for upper three mentioned CRS’s, in order to be
used by all GIS software users without need for deep knowledge
for coordinate systems: <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<table class="MsoNormalTable"
style="width:374.85pt;border-collapse:collapse" width="500"
cellspacing="0" cellpadding="0" border="0">
<tbody>
<tr>
<td style="width:27.6pt;border:solid windowtext
1.0pt;padding:0in 5.4pt 0in 5.4pt" width="37"
valign="top">
<p class="MsoNormal"><b><span style="font-size:8.0pt"
lang="DE">CRS</span></b><o:p></o:p></p>
</td>
<td style="width:231.6pt;border:solid windowtext
1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt"
width="309" valign="top">
<p class="MsoNormal"><b><span style="font-size:8.0pt"
lang="DE">PROJ STRING </span></b><o:p></o:p></p>
</td>
<td style="width:115.65pt;border:solid windowtext
1.0pt;border-left:none;padding:0in 0in 0in 0in"
width="154" valign="top">
<p class="MsoNormal"><b><span style="font-size:8.0pt"
lang="DE">Datim transformation EPSG code</span></b><o:p></o:p></p>
</td>
</tr>
<tr>
<td style="width:27.6pt;border:solid windowtext
1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt"
width="37" valign="top">
<p class="MsoNormal"><span style="font-size:8.0pt"
lang="DE">EPSG 6204</span><o:p></o:p></p>
</td>
<td
style="width:231.6pt;border-top:none;border-left:none;border-bottom:solid
windowtext 1.0pt;border-right:solid windowtext
1.0pt;padding:0in 5.4pt 0in 5.4pt" width="309"
valign="top">
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier New
\,serif"">+proj=tmerc +lat_0=0 +lon_0=21
+k=0.9999 +x_0=500000 +y_0=0 +ellps=bessel
+towgs84=521.748,229.489,590.921,4.029,4.488,-15.521,-9.78
+units=m +no_defs</span><o:p></o:p></p>
</td>
<td
style="width:115.65pt;border-top:none;border-left:none;border-bottom:solid
windowtext 1.0pt;border-right:solid windowtext
1.0pt;padding:0in 0in 0in 0in" width="154" valign="top">
<p class="MsoNormal" style="text-align:center"
align="center"><span
style="font-size:8.0pt;font-family:"Courier New
\,serif""> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:center"
align="center"><span
style="font-size:8.0pt;font-family:"Courier New
\,serif"" lang="DE">6206</span><o:p></o:p></p>
</td>
</tr>
<tr>
<td style="width:27.6pt;border:solid windowtext
1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt"
width="37" valign="top">
<p class="MsoNormal"><span style="font-size:8.0pt"
lang="DE">EPSG </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt"
lang="DE">6316</span><o:p></o:p></p>
</td>
<td
style="width:231.6pt;border-top:none;border-left:none;border-bottom:solid
windowtext 1.0pt;border-right:solid windowtext
1.0pt;padding:0in 5.4pt 0in 5.4pt" width="309"
valign="top">
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier New
\,serif"">+proj=tmerc +lat_0=0 +lon_0=21
+k=0.9999 +x_0=7500000 +y_0=0 +ellps=bessel
+towgs84=521.748,229.489,590.921,4.029,4.488,-15.521,-9.78
+units=m +no_defs</span><o:p></o:p></p>
</td>
<td
style="width:115.65pt;border-top:none;border-left:none;border-bottom:solid
windowtext 1.0pt;border-right:solid windowtext
1.0pt;padding:0in 0in 0in 0in" width="154" valign="top">
<p class="MsoNormal" style="text-align:center"
align="center"><span
style="font-size:8.0pt;font-family:"Courier New
\,serif""> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:center"
align="center"><span
style="font-size:8.0pt;font-family:"Courier New
\,serif"" lang="DE">6206</span><o:p></o:p></p>
</td>
</tr>
<tr>
<td style="width:27.6pt;border:solid windowtext
1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt"
width="37" valign="top">
<p class="MsoNormal"><span style="font-size:8.0pt"
lang="DE">EPSG </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt"
lang="DE">9945</span><o:p></o:p></p>
</td>
<td
style="width:231.6pt;border-top:none;border-left:none;border-bottom:solid
windowtext 1.0pt;border-right:solid windowtext
1.0pt;padding:0in 5.4pt 0in 5.4pt" width="309"
valign="top">
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier New
\,serif"">+proj=tmerc +lat_0=0 +lon_0=21
+k=0.9999 +x_0=500000 +y_0=-4000000 +ellps=bessel
+towgs84=521.748,229.489,590.921,4.029,4.488,-15.521,-9.78
+units=m +no_defs</span><o:p></o:p></p>
</td>
<td
style="width:115.65pt;border-top:none;border-left:none;border-bottom:solid
windowtext 1.0pt;border-right:solid windowtext
1.0pt;padding:0in 0in 0in 0in" width="154" valign="top">
<p class="MsoNormal" style="text-align:center"
align="center"><span
style="font-size:8.0pt;font-family:"Courier New
\,serif""> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:center"
align="center"><span
style="font-size:8.0pt;font-family:"Courier New
\,serif"" lang="DE">6206</span><o:p></o:p></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">This initiative I started with paper that
have been published and presented in ICA conference 2021 <a
href="https://www.proc-int-cartogr-assoc.net/4/45/2021"
moz-do-not-send="true" class="moz-txt-link-freetext">https://www.proc-int-cartogr-assoc.net/4/45/2021</a>
<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">To be more clear, my intention is to make
simple and easier usage of CRS’s by users in North Macedonia
in a case when they overlap official data with data coming
from other sources based on WGS84 datum. <o:p></o:p></p>
<p class="MsoNormal">As example I will mention QGIS software,
which use default datum transformation parameters, and in
parallel offers “ask” option if several datum transformations
are available. Second option can be used by geodetic
professionals, however most of GIS users are not able to use
this option and they have troubles in overlapping their data
in state CRS with global data such openstreetmap, google map,
etc. <o:p></o:p></p>
<p class="MsoNormal">Therefore I started this initiative to
solve this problem step by step. First was creating all EPSG
codes for three type of spatial data which was finished in
March 18<sup>th</sup>, and second is this/todays request to
you for defining in PROJ the EPSG 6206 as default datum
transformation for three CRS’s (6204, 6316 and 9945), which
will enable their usage by all GIS software users without deep
knowledge in coordinate systems. <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Maybe my explanation was not precise in
above text, therefore I will try to give some additional
details on this issue. I order to be more clear I will explain
with concrete example by QGIS software: <o:p></o:p></p>
<ol style="margin-top:0in" type="1" start="1">
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level1 lfo3">In current
version of EPSG 6316, in a case of usage in QGIS with
non-checked “ask option if several datum transformations are
available”, software doesn’t ask user for selecting of
appropriate transformation, and use bellow values as default
transformation: <span
style="background:yellow;mso-highlight:yellow">+proj=tmerc
+lat_0=0 +lon_0=21 +k=0.9999 +x_0=7500000 +y_0=0
+ellps=bessel <span style="color:red">+towgs84=682,-203,480,0,0,0,0
</span>+units=m +no_defs</span><o:p></o:p></li>
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level1 lfo3">More than
90% of users (except geodetic professionals) don’t know what
is datum transformation, and they uncheck the “ask option if
several datum transformations are available” option (from
setting/options/CRS/transformations), or never use if this
box is unchecked by installation. <o:p></o:p></li>
<ol style="margin-top:0in" type="1" start="1">
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level2 lfo3">In this
case, QGIS software users in our country works with
totally wrong datum transformation, which results with
large difference between data in 6316 with global data
developed in WGS84. <o:p></o:p></li>
</ol>
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level1 lfo3">In order to
avoid such problems, my request is to change those “default”
datum transformation parameters (<span
style="color:red;background:yellow;mso-highlight:yellow">+towgs84=682,-203,480,0,0,0,0</span>)
in a case when the box “ask option if several datum
transformations are available” is unchecked, with the
transformation parameters defined in 6202 <span
style="background:yellow;mso-highlight:yellow">(+proj=tmerc
+lat_0=0 +lon_0=21 +k=0.9999 +x_0=7500000 +y_0=0
+ellps=bessel <b><span style="color:red">+towgs84=521.748,229.489,590.921,4.029,4.488,-15.521,-9.78</span></b>
+units=m +no_defs</span>). <o:p></o:p></li>
<ol style="margin-top:0in" type="1" start="1">
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level2 lfo3">Maybe
“default datum transformation” is not appropriate term.
Now I hope that my request is more clear. <o:p></o:p></li>
</ol>
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level1 lfo3">I am aware
that QGIS will continue to propose all candidate operations
reported by PROJ in a case when CRS intersects with several
areas in a case when box “ask option if several datum
transformations are available” is checked. This is correct
and it very important for geodetic experts, that are able to
use appropriate transformation in a case of several
transformation parameters are available. <o:p></o:p></li>
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level1 lfo3"><b><u>Main
objective of my request is only in a case when user
don’t check/use the box “ask option if several datum
transformations are available” and software work with
default transformation parameters. </u></b><o:p></o:p></li>
<ol style="margin-top:0in" type="1" start="1">
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level2 lfo3"><b><u>In
this case, as datum transformation to WGS84 for three
CRS’s (EPSG 6316, EPSG 6204, and EPSG 9945) to be set
EPSG 6206 as primary/default datum transformation from
MGI 1901 to WGS84 (see table in my previous email). </u></b><o:p></o:p></li>
</ol>
</ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If the request is not clear, please don’t
hesitate to ask me for every detail, as well as I am able to
schedule online meeting with you. <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Sincerely yours, <o:p></o:p></p>
<p class="MsoNormal">Bashkim Idrizi. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:black">==================================================<o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#0000BF"><a
href="https://bashkim-idrizi.blogspot.com/"
moz-do-not-send="true"><span style="color:blue">Prof.Dr.
Bashkim IDRIZI</span></a></span></b><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:#0000BF">----------------------------------------------------------------------------------</span></b><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:#0000BF"><a
href="http://www.uni-pr.edu/" target="_blank"
moz-do-not-send="true"><span style="color:blue">University
of Prishtina</span></a><i>, Cartography & GIS
lecturer</i> </span><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:black"><a
href="http://www.unt.edu.mk/" target="_blank"
moz-do-not-send="true"><span style="color:blue">University
"Mother Teresa" Skopje</span></a></span><i><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:#0000BF">,
Cartography lecturer </span></i><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:#0000BF"><a
href="http://www.geo-see.org/" target="_blank"
moz-do-not-send="true"><span style="color:blue">Geo-SEE
Institute</span></a><i>, President </i> </span><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:black"><a
href="http://www.unite.edu.mk/" target="_blank"
moz-do-not-send="true"><span style="color:blue">State
University of Tetova</span></a></span><i><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:#0000BF">,
Past cartography & GIS lecturer </span></i><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><u><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:#0000BF"><a
href="http://www.karl-gega.org/" target="_blank"
moz-do-not-send="true"><span style="color:blue">Karl
Gega Association,</span></a></span></u><i><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:#0000BF"> Past
President </span></i><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:#0000BF"> </span><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:#0000BF">adress:
str. Djon Kenedi, 25/4-20; 1010 Skopje, North Macedonia. </span><span
style="font-size:6.0pt;font-family:"Times New
Roman",serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:#0000BF">gsm-mk:
+ 389 /75/ 712-998 (Viber & WhatsApp)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:#0000BF">gsm-ks:
+ 383 /45/ 341-098 </span><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:#0000BF">skype:
bashkim.idrizi (<a
href="mailto:bashkim.idrizi@yahoo.com"
moz-do-not-send="true" class="moz-txt-link-freetext">bashkim.idrizi@yahoo.com</a>)</span><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:6.0pt;font-family:"Arial",sans-serif;color:black">==================================================</span><span
style="font-size:6.0pt"><o:p></o:p></span></p>
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<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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