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<p>Steve,</p>
<p>Fix in PROJ queued in <a class="moz-txt-link-freetext" href="https://github.com/OSGeo/PROJ/pull/3123">https://github.com/OSGeo/PROJ/pull/3123</a></p>
<p>The complexity of dealing with legacy features TOWGS84[] and
PROJ4_GRIDS is highly stressing PROJ pipeline computation engine.</p>
<p>Using the plain EPSG codes EPSG:4955 -> EPSG:4617+5713 would
be much preferable here</p>
<p>Even<br>
</p>
<div class="moz-cite-prefix">Le 18/03/2022 à 21:14, Steve Riddell a
écrit :<br>
</div>
<blockquote type="cite"
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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m getting an error (below) using GDAL
trying to set up a transformation between NAD83(CSRS)
geodetic, w/ ellipsoidal heights, and NAD83(CSRS) geodetic,
CGVD28 heights. Similar transformations work fine on some
datums, but fail on others. Hope someone can offer some
insight. Note the if I don't use the PROJ4_GRIDS extension, I
don't get the error, but I don't get the geoid adjustment
either.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">COMPD_CS["NAD83(CSRS) + Ellipsoid
(Meters)",<o:p></o:p></p>
<p class="MsoNormal"> GEOGCS["NAD83(CSRS)",<o:p></o:p></p>
<p class="MsoNormal">
DATUM["NAD83_Canadian_Spatial_Reference_System",<o:p></o:p></p>
<p class="MsoNormal"> SPHEROID["GRS
1980",6378137,298.257222101,<o:p></o:p></p>
<p class="MsoNormal"> AUTHORITY["EPSG","7019"]],<o:p></o:p></p>
<p class="MsoNormal"> TOWGS84[0,0,0,0,0,0,0],<o:p></o:p></p>
<p class="MsoNormal"> AUTHORITY["EPSG","6140"]],<o:p></o:p></p>
<p class="MsoNormal"> PRIMEM["Greenwich",0,<o:p></o:p></p>
<p class="MsoNormal"> AUTHORITY["EPSG","8901"]],<o:p></o:p></p>
<p class="MsoNormal"> UNIT["degree",0.0174532925199433,<o:p></o:p></p>
<p class="MsoNormal"> AUTHORITY["EPSG","9122"]],<o:p></o:p></p>
<p class="MsoNormal"> AUTHORITY["EPSG","4617"]],<o:p></o:p></p>
<p class="MsoNormal"> VERT_CS["Ellipsoid (Meters)",<o:p></o:p></p>
<p class="MsoNormal"> VERT_DATUM["Ellipsoid",2002],<o:p></o:p></p>
<p class="MsoNormal"> UNIT["metre",1,<o:p></o:p></p>
<p class="MsoNormal"> AUTHORITY["EPSG","9001"]],<o:p></o:p></p>
<p class="MsoNormal"> AXIS["ellipsoidal height",UP]]]<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">COMPD_CS["NAD83(CSRS) + CGVD28 height -
HT2_0",<o:p></o:p></p>
<p class="MsoNormal"> GEOGCS["NAD83(CSRS)",<o:p></o:p></p>
<p class="MsoNormal">
DATUM["NAD83_Canadian_Spatial_Reference_System",<o:p></o:p></p>
<p class="MsoNormal"> SPHEROID["GRS
1980",6378137,298.257222101,<o:p></o:p></p>
<p class="MsoNormal"> AUTHORITY["EPSG","7019"]],<o:p></o:p></p>
<p class="MsoNormal"> TOWGS84[0,0,0,0,0,0,0],<o:p></o:p></p>
<p class="MsoNormal"> AUTHORITY["EPSG","6140"]],<o:p></o:p></p>
<p class="MsoNormal"> PRIMEM["Greenwich",0,<o:p></o:p></p>
<p class="MsoNormal"> AUTHORITY["EPSG","8901"]],<o:p></o:p></p>
<p class="MsoNormal"> UNIT["degree",0.0174532925199433,<o:p></o:p></p>
<p class="MsoNormal"> AUTHORITY["EPSG","9122"]],<o:p></o:p></p>
<p class="MsoNormal"> AUTHORITY["EPSG","4617"]],<o:p></o:p></p>
<p class="MsoNormal"> VERT_CS["CGVD28 height - HT2_0",<o:p></o:p></p>
<p class="MsoNormal"> VERT_DATUM["Canadian Geodetic
Vertical Datum of 1928",2005,<o:p></o:p></p>
<p class="MsoNormal">
EXTENSION["PROJ4_GRIDS","HT2_0.gtx"],<o:p></o:p></p>
<p class="MsoNormal"> AUTHORITY["EPSG","5114"]],<o:p></o:p></p>
<p class="MsoNormal"> UNIT["metre",1,<o:p></o:p></p>
<p class="MsoNormal"> AUTHORITY["EPSG","9001"]],<o:p></o:p></p>
<p class="MsoNormal"> AXIS["Gravity-related height",UP],<o:p></o:p></p>
<p class="MsoNormal"> AUTHORITY["EPSG","5713"]]]<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">ERROR 6: Cannot find coordinate operations
from `EPSG:4955' to `COMPOUNDCRS["NAD83(CSRS) + CGVD28 height
- HT2_0",BOUNDCRS[SOURCECRS[GEOGCRS["NAD83(CSRS)",DATUM["NAD83
Canadian Spatial Reference System",ELLIPSOID["GRS
1980",6378137,298.257222101,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],CS[ellipsoidal,2],AXIS["geodetic
latitude
(Lat)",north,ORDER[1],ANGLEUNIT["degree",0.0174532925199433]],AXIS["geodetic
longitude
(Lon)",east,ORDER[2],ANGLEUNIT["degree",0.0174532925199433]],ID["EPSG",4617]]],TARGETCRS[GEOGCRS["WGS
84",DATUM["World Geodetic System 1984",ELLIPSOID["WGS
84",6378137,298.257223563,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],CS[ellipsoidal,2],AXIS["latitude",north,ORDER[1],ANGLEUNIT["degree",0.0174532925199433]],AXIS["longitude",east,ORDER[2],ANGLEUNIT["degree",0.0174532925199433]],ID["EPSG",4326]]],ABRIDGEDTRANSFORMATION["Transformation
from NAD83(CSRS) to WGS84",METHOD["Position Vector
transformation (geog2D
domain)",ID["EPSG",9606]],PARAMETER["X-axis
translation",0,ID["EPSG",8605]],PARAMETER["Y-axis
translation",0,ID["EPSG",8606]],PARAMETER["Z-axis
translation",0,ID["EPSG",8607]],PARAMETER["X-axis
rotation",0,ID["EPSG",8608]],PARAMETER["Y-axis
rotation",0,ID["EPSG",8609]],PARAMETER["Z-axis
rotation",0,ID["EPSG",8610]],PARAMETER["Scale
difference",1,ID["EPSG",8611]]]],BOUNDCRS[SOURCECRS[VERTCRS["CGVD28
height - HT2_0",VDATUM["Canadian Geodetic Vertical Datum of
1928"],CS[vertical,1],AXIS["gravity-related
height",up,LENGTHUNIT["metre",1]],ID["EPSG",5713]]],TARGETCRS[GEOGCRS["WGS
84",DATUM["World Geodetic System 1984",ELLIPSOID["WGS
84",6378137,298.257223563,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],CS[ellipsoidal,3],AXIS["latitude",north,ORDER[1],ANGLEUNIT["degree",0.0174532925199433]],AXIS["longitude",east,ORDER[2],ANGLEUNIT["degree",0.0174532925199433]],AXIS["ellipsoidal
height",up,ORDER[3],LENGTHUNIT["metre",1]],ID["EPSG",4979]]],ABRIDGEDTRANSFORMATION["CGVD28
height - HT2_0 to WGS84 ellipsoidal
height",METHOD["GravityRelatedHeight to
Geographic3D"],PARAMETERFILE["Geoid (height correction) model
file","HT2_0.gtx",ID["EPSG",8666]]]]]'<o:p></o:p></p>
<pre><o:p> </o:p></pre>
<pre><span style="font-family:"Calibri",sans-serif">Thanks in advance for any assistance!
Best regards,<o:p></o:p></span></pre>
<pre><span style="font-family:"Calibri",sans-serif">Steve<o:p></o:p></span></pre>
<pre><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></pre>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:13.5pt;font-family:"Tahoma",sans-serif">Steve
Riddell<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Tahoma",sans-serif">Software
Engineering</span><span
style="font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="color:#525252">GeoCue
Group, Inc.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:10.0pt">520 6th
Street | Madison, AL 35756 USA</span><b><span
style="color:#525252"><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt">Phone:</span></b><span
style="font-size:10.0pt"> 256.461.8289 |
<b>Fax:</b> 256.461.8249 <o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="color:#0070C0">LIDAR/Drone
Mapping Software & Services
</span></i><i><span style="font-size:9.0pt">– </span></i><i><span
style="color:#538135">True View® 3D Imaging Sensors
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style="color:#C45911"> Image/LIDAR Data Management
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<p class="MsoNormal"><span style="font-size:10.0pt"> </span><a
href="http://www.geocue.com/" moz-do-not-send="true"><span
style="font-size:10.0pt;color:#0070C0">www.geocue.com</span></a><span
style="font-size:10.0pt;color:#0070C0">
<a href="https://support.geocue.com/" moz-do-not-send="true">support.geocue.com</a>
</span><span style="font-size:10.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<pre><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></pre>
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</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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