<div dir="ltr">My apologies on typing the link and adding an 's' to the name. Should be<div><a href="ftp://ftp.coast.noaa.gov/tmp/kwaters/autocad_issue.zip">ftp://ftp.coast.noaa.gov/tmp/kwaters/autocad_issue.zip</a></div><div><br></div><div>Thanks for the tip on the configuration option! I agree about the ideal solution.</div><div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">Kirk</div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Oct 7, 2021 at 3:59 PM Even Rouault <<a href="mailto:even.rouault@spatialys.com">even.rouault@spatialys.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>Kirk,</p>
<p>the download link doesn't work.</p>
<p>GDAL 3.3 will use geotiff 1.1 conventions by default when a
compound CRS is used. You may try adding -co GEOTIFF_VERSION=1.0
to force GeoTIFF 1.0.<br>
</p>
<p>When reading a GeoTIFF 1.1 file, GDAL will report the
compoundCRS. For GeoTIFF 1.0 files, you need to specify --config <code class="gmail-notranslate"><span>GTIFF_REPORT_COMPD_CS YES (see
<a href="https://gdal.org/drivers/raster/gtiff.html#configuration-options" target="_blank">https://gdal.org/drivers/raster/gtiff.html#configuration-options</a>)</span></code></p>
<p>Autocad users should ideally report that to their vendor so they
add support for GeoTIFF 1.1 (or maybe the issue is not much the
change of the version number, but that we stripped down the
formulation of geokeys to the minimum to avoid specifying things
twice and the risk of contradiction)<br>
</p>
<p>Even<br>
<code class="gmail-notranslate"><span></span></code><code class="gmail-notranslate"><span></span></code></p>
<div>Le 07/10/2021 à 21:41, Kirk Waters -
NOAA Federal via gdal-dev a écrit :<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Hi all,</div>
I'm finding a change in georeferencing between GDAL 2.4 and 3.x
that results in AutoCAD not being able to figure out where on
earth a geotiff should be. I don't have AutoCAD, so I'm
reliant on what my downstream users are telling me. These are
elevation Tiffs, so they do have a vertical component to the SRS
and that may be where the difference lies. I know it isn't up to
GDAL to solve AutoCAD's lack of standards adoption, but I'm
wondering if anyone has come across this and if there's a way to
force the outputs that AutoCAD will read.
<div><br>
</div>
<div>Two small files are included in a zip file at <a href="ftp://ftp.coast.noaa.gov/tmp/kwaters/autocad_issues.zip" target="_blank">ftp://ftp.coast.noaa.gov/tmp/kwaters/autocad_issues.zip</a>.
One (Job640647_ches_coned.tif, made with GDAL 2.4) has
georeferencing that works in AutoCAD, the other was made with
GDAL 3.3.1 and has georeferencing that fails. Both were made
with gdal_translate -a_srs EPSG:3582+6360 with the difference
being the version of GDAL. They are not the exact same
location on the ground.</div>
<div><br>
</div>
<div>If I look at the files with listgeo, the older version has
more tags and includes the horizontal and vertical units. With
gdalsrsinfo, the newer one shows the more complete COMPOUNDCRS
that includes the vertical component.</div>
<div><br>
</div>
<div>I'm hoping I don't have to go back to GDAL 2.4 for AutoCAD
users. If anyone has come across a solution before, I'd love
to hear it.</div>
<div><br>
</div>
<div>Thanks,</div>
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<div><font face="arial, helvetica,
sans-serif">Kirk Waters, PhD
| NOAA Office for Coastal
Management<br>
</font></div>
<div><font face="arial, helvetica,
sans-serif">Applied Sciences Program
| 2234 South Hobson Ave<br>
| Charleston, SC 29405</font></div>
<div><font face="arial, helvetica,
sans-serif"> </font></div>
<div><br>
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