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<p>Jochen,</p>
<p>I just looked at your shapefiles. The issue is not with the CRS.
It is with the actual geometry coordinates. They are all in the
[0,1000] x [0,1000] range, which is totally outside of the area of
validity of the CRS (the false easting / northing valus of the CRS
are 400,000, so close to 0, you're 400 km off the center of the
projection). So displaying it offboard of France is the *right*
thing to do. There must be have some processing done at some point
on your original shapefiles to alter their coordinates and
normalize them to [0,1000].<br>
</p>
<p>Even<br>
</p>
<div class="moz-cite-prefix">Le 25/09/2024 à 17:04, Jochen Albrecht
a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAKRQQ2R9OkBzTj=k3RCUveb0XxroA72SNNQCsHmPAkDP-TLJww@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div>Dear Brian:</div>
<div><br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">how
is it that you have never reached out before today?</blockquote>
<div><br>
</div>
<div>Because the problem occured only this week and I spent the
last two days trying to figure out what is going on. The last
time I used this lab exercise was a year ago, and hence with
OSgeo-Live v15. </div>
<div><br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">did
you take any steps to identify what projection system is being
used to misplace this shp file?</blockquote>
<div><br>
</div>
<div>QGIS (as well as ArcGIS) claim that they are using the
correct coordinate system.</div>
<div><br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">did
you try to install and run any other version of QGIS on this
version 16 base, in any way?</blockquote>
<div><br>
</div>
<div>No, I did not because I am trying to avoid this for the
sake of not killing the carefully aligned libraries of
OSgeo-Live.</div>
<div><br>
</div>
<div>I am attaching the mini archive of the sample data that now
causes these problems. I am also attaching screenshots of the
automatic pop-up window when I load the same file into the
stand-alone version of QGIS, which prompts me to confirm a
coordinate system transformation procedure.</div>
<div><br>
</div>
<div>Cheers,</div>
<div> Jochen</div>
<div><br>
</div>
<div><img src="cid:part1.7utqfj4E.Pkiaa78k@spatialys.com"
alt="transform1.png" style="margin-right: 25px;" class=""><br>
</div>
<div><img src="cid:part2.6pORIwrQ.57pH3VCZ@spatialys.com"
alt="transform2.png" style="margin-right: 25px;" class=""><br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Sep 24, 2024 at
7:22 PM Brian M Hamlin <<a
href="mailto:maplabs@light42.com" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">maplabs@light42.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">
<div>
<p>Dear Dr Albrecht -</p>
<p> this is the first time I have heard of this issue..
we are building the newer, alpha1 version 17 now using a
newer QGIS LTS. Due to this combination of factors,
your email raises more questions</p>
<p>* how is it that you have never reached out before
today? no one on the #osgeolive team can know all the
places that the disk is used. If I understand, this
condition of one particular QGIS misplacing a shp file
would have been the case on the day that version 16 was
released? therefore you have taught many times yet
never one email here. Why now, on the week that we start
the anticipated alpha1 version 17 based on Ubuntu noble
and GDAL v3.9x.</p>
<p>* did you take any steps to identify what projection
system is being used to misplace this shp file? for
example, does it say in the bottom corner of the window
of QGIS ? do you have any guesses as to what the errant
projection might be, and if so did you include that in
your description of this bug, below? maybe I missed a
section.. <br>
</p>
<p>* did you try to install and run any other version of
QGIS on this version 16 base, in any way? I am not a
QGIS expert but I am guessing there are several
alternatives that would install something.</p>
<p> today I am busy running and testing a build of
#osgeolive 17, which promises improvements and
stability.. as with the dozen or so #osgeolive linux
that have shipped reliably, without cost to you, for the
last decade.</p>
<p> --Brian M Hamlin / MAPLABS / OSGeoLive PSC</p>
<p><br>
</p>
<p><br>
</p>
<div>On 9/24/24 11:13, Jochen Albrecht via osgeolive
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Hi</div>
<div><br>
</div>
<div>I am teaching with the latest version of
OSgeo-Live 16, which runs QGIS 3.28.</div>
<div>I am using for my class a small demo shapefile,
which happens to be in EPSG:31287 (Austria, Styria).
QGIS 3.28 places this file into the Mediterranean
Sea, off the coast of Italy/France.</div>
<div>Earlier versions of QGIS (in previous years of
teaching), as well as my current stand-alone version
3.36 are placing the data correctly into the
province of Styria in Austria. The problem occurs
only in version 3.28.</div>
<div><br>
</div>
<div>The problem is aggravated by the fact that any
attempt at transforming the data is rendered futile
in this particular version of QGIS because none of
the reprojection dialogues allow me to specify a
transformation. I even tried to define a new
coordinate system using the transformation
parameters given by QGIS 3.38 (see the bottom of
this email). Applying these, places the data again
into the Mediterranean.</div>
<div><br>
</div>
<div>I have been teaching with QGIS for over 20 years,
and this is a new one for me. The easy solution
would be to just not use version QGIS 3.28. But it
is the one that has been burned into the current
OSgeo-Live distribution. The whole purpose of
OSgeo-Live is to work with versions of the
individual software packages that have proven to
play nice with each other and I do not want to
experiment and have students upgrade to a
newer version of GIS.</div>
<div><br>
</div>
<div>At this point, I am at a loss to advise my
students what to do, or to even explain what is
happening here. It is as if the particular
coordinate system library for this version has a bug
that nobody has come across before. Am I missing
something?</div>
<div>Last minute update: the same error occurs in the
latest version of ArcGIS Pro 3.3. I have no idea
what those two have in common, but it suggests to me
that it has something to do with a flawed coordinate
system library rather than the application software
itself.</div>
<div>Again, any suggestion for how to address this (or
even explain it to my students) would be
appreciated.</div>
<div><br>
</div>
<div>Cheers,</div>
<div> Jochen</div>
<div><br>
</div>
<div>
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<p dir="ltr"
style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span
style="font-family:Arial;vertical-align:baseline;white-space:pre-wrap">Dr. Jochen Albrecht, GISP (he/him/his)</span></p>
<p dir="ltr"
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style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span
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style="font-family:Arial;background-color:transparent;vertical-align:baseline;white-space:pre-wrap">695 Park Avenue</span></p>
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<span>Recently published: </span><a
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<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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