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<p class="MsoNormal"><span lang="EN-GB">Thanks.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I encountered a new problem:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">We use a horizontal grid as well as a vertical grid for the transformation from ETRS89 (EPSG:4937) to our national CRS: RD (EPSG:28992) with NAP height (EPSG:5709). With PROJ4-style strings [1],</span><span lang="EN-GB" style="mso-fareast-language:EN-US">
an interpolation CRS (EPSG:4289) is needed for the Geodetic TIFF grid of the geoid,
</span><span lang="EN-GB">n</span><span lang="EN-GB" style="mso-fareast-language:EN-US">ext to the source
</span><span lang="EN-GB">(EPSG:4937) </span><span lang="EN-GB" style="mso-fareast-language:EN-US">and target
</span><span lang="EN-GB">(EPSG:5709) </span><span lang="EN-GB" style="mso-fareast-language:EN-US">CRS. To specify this, I have to use
</span><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas;mso-fareast-language:EN-US">--type VERTICAL_TO_VERTICAL</span><span lang="EN-GB" style="mso-fareast-language:EN-US"> in the Python script for the conversion from the VDatum grid. This results
in the description “vertical offset” instead of “geoid undulation”. This is a bit strange, as the grid is in fact a geoid. Problematic is that (according to the documentation [2]) the source and target CRS both must be a vertical CRS, while one is our national
levelling height system NAP, but the other is ellipsoidal ETRS89 height. The latter doesn’t have a vertical EPSG code. What is the WKT string of ETRS89 ellipsoidal height? This seems way too complicated for a Geodetic TIFF grid file of a VDatum geoid grid
file of a type that must have been very common under PROJ4.</span><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Next to this, I have some new questions on the use of
</span><span lang="EN-GB">WKT strings instead of EPSG codes for the</span><span lang="EN-GB" style="mso-fareast-language:EN-US"> specification of a CRS in a Geodetic TIFF
</span><span lang="EN-GB">grid file: <o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:17.4pt;mso-list:l2 level1 lfo1"><span lang="EN-GB">Are the simpler EPSG codes preferred over WKT strings? Is it OK to use a WKT string for the source and a EPSG code for the target, or would it be better to use
a WKT string for both source and target in such case?<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:17.4pt;mso-list:l2 level1 lfo1"><span lang="EN-GB">Can I use the WKT string given by EPSG.org for a CRS with an EPSG code and edit the CRS name in this WKT string to use an alias instead of the official EPSG name
(see example [3])? <o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Regards, Jochem<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">[1] PROJ4-style transformation from ETRS89 (EPSG:4937) to national horizontal and vertical CRS of the Netherlands:
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">cs2cs +init=epsg:4937 +to +proj=sterea +lat_0=52.156160556 +lon_0=5.387638889 +k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel +nadgrids=rdtrans2018.gsb
</span><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas;mso-fareast-language:EN-US">+units=m
</span><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">+geoidgrids=naptrans2018.gtx
</span><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas;mso-fareast-language:EN-US">+vunits=m</span><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> +no_defs
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">[2] <a href="https://github.com/OSGeo/PROJ-data/blob/master/grid_tools/README.md">
https://github.com/OSGeo/PROJ-data/blob/master/grid_tools/README.md</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">[</span><span lang="EN-GB">3] WKT string of EPSG:4289 where I replaced the official EPSG name “Amersfoort” to the official Dutch name “RD Bessel”:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-size:10.0pt;font-family:Consolas">GEOGCRS["<u><span style="color:red">RD Bessel</span></u>",<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-size:10.0pt;font-family:Consolas"> DATUM["Amersfoort",<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-size:10.0pt;font-family:Consolas">
</span><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">ELLIPSOID["Bessel 1841",6377397.155,299.1528128,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> LENGTHUNIT["metre",1,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> ID["EPSG",9001]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> ],<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> ID["EPSG",7004]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> ],<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> ID["EPSG",6289]],<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> CS[ellipsoidal,2,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> ID["EPSG",6422]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> ],<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> AXIS["latitude (Lat)",north],<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> AXIS["longitude (Lon)",east],<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> ANGLEUNIT["degree",0.0174532925199433,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> ID["EPSG",9102]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> ],<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"> ID["EPSG",4289]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Even Rouault <even.rouault@spatialys.com>
<br>
<b>Sent:</b> maandag 24 januari 2022 21:17<br>
<b>To:</b> Lesparre, Jochem <Jochem.Lesparre@kadaster.nl>; PROJ@lists.osgeo.org<br>
<b>Subject:</b> Re: [PROJ] Correcting metadata in GeoTIFF files<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p><span lang="EN-GB">Jochem,<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-GB">Le 24/01/2022 à 20:09, Lesparre, Jochem via PROJ a écrit :<o:p></o:p></span></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoPlainText"><span lang="EN-GB">Dear list,<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">I'm from Netherlands Partnership Geodetic Infrastructure (NSGI). We published NTv2 (.gsb) and VDatum (.gtx) grid files for the national CRS of the Netherlands (RD coordinates with NAP height) in 2019. PROJ converted
these to GeoTIFF (.tif) in 2020 [1]. Unfortunately, some wrong information was stored in the metadata of the GeoTIFF files in the conversion. We are now creating new GeoTIFF files with corrected metadata, using the Python scrips ntv2_to_gtiff.py [2] and vertoffset_grid_to_gtiff.py
[3]. <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">For most changes in the metadata this is straightforward, but there is one more difficult issue:<o:p></o:p></span></p>
<p class="MsoPlainText" style="margin-left:35.4pt"><span lang="EN-GB">We have two variants of the horizontal transformation:
<o:p></o:p></span></p>
<p class="MsoPlainText" style="margin-left:71.4pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang="EN-GB"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">Conventional 1-step transformation (variant 2): geographic coordinates of national CRS ---[nl_nsgi_rdtrans2018.tif]---> ETRS89
<o:p></o:p></span></p>
<p class="MsoPlainText" style="margin-left:71.4pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang="EN-GB"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">Better 2-step transformation (variant 1): geographic coordinates of national CRS ---[nl_nsgi_rdcorr2018.tif]---> corrected geographic coordinates of national CRS ---[7_parameter_transformation]---> ETRS89<o:p></o:p></span></p>
<p class="MsoPlainText" style="margin-left:35.4pt"><span lang="EN-GB">Since there is no separate EPSG code for the corrected geographic coordinates of the national CRS, we want to use the same EPSG code for both corrected and uncorrected coordinates. Or will
it give problems when the source and target CRS of a GeoTIFF file are the same?<o:p></o:p></span></p>
</blockquote>
<p><span lang="EN-GB">Instead of the target_crs_code metadata item, you could include a target_crw_wkt with a WKT2 string. That can be done through the ntv2_to_gtiff.py script as it can accept a WKT2 CRS string as the value for --target-crs.<o:p></o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoPlainText"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">Next to this, I have some other questions:<o:p></o:p></span></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoPlainText" style="mso-list:l1 level1 lfo3"><span lang="EN-GB">Shouldn't a GeoTIFF grid file for a vertical transformation have an accuracy band like a grid for a horizontal transformation? Is it possible with the Python script to create an accuracy
band in the GeoTIFF from a VDatum grid file?<o:p></o:p></span></li></ol>
</blockquote>
<p><span lang="EN-GB">You could possibly add with GDAL standard tools (gdal_translate, etc) a band with the accuracy and a description of "geoid_undulation_accuracy" (you may need to go through a VRT to manually add the Units to the band). The validate_vertical_offset_geographic_to_vertical()
method of the check_gtiff_grid.py script would likely have to be updated so that it doesn't emit an information message about the new band not being recognized. And the spec at
</span><a href="https://secure-web.cisco.com/1IPsQrcS7XiA25_SIbwFzb-QZAKsmLdiZCviwwLfntX_LP5RL4MhT86HqkIDLHoWnxjGPsOj9qatKSQRQ6s-3OgTu2NWmUxO08eXFQDCyBNoiM6PgcO9f94P0uPY5Tod4uKHZ2DYmeBgeH9t6R_uf9AxSLI6uZ7h4ReNQ8fupVoj7z9uP0to6Nlr1Kti7lJycLJvZgYL1hGJywSBwFWky-TKX6tQWP90b26Q0Iub853RFhi4Meej8qTYaHcMfPtczIIxD62IAkCtQyIv3XMdTneUYyFMRszve23cNIudpKQzeuZzt3yS_yl6bQIPnPMO6/https%3A%2F%2Fproj.org%2Fspecifications%2Fgeodetictiffgrids.html"><span lang="EN-GB">https://proj.org/specifications/geodetictiffgrids.html</span></a><span lang="EN-GB">
as well<o:p></o:p></span></p>
<p><span lang="EN-GB"><o:p> </o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<ol style="margin-top:0cm" start="2" type="1">
<li class="MsoPlainText" style="mso-list:l1 level1 lfo3"><span lang="EN-GB">Can I add a recommended_interpolation_method with the Python scripts?<o:p></o:p></span></li></ol>
</blockquote>
<p class="MsoNormal"><span lang="EN-GB">Not currently. Either enhance them or add the metadata item manually through GDAL tools (gdal_translate -mo recommended_interpolation_method=foo in.tif out.tif -co COMPRESS=DEFLATE -co INTERLEAVE=BAND -co PREDICTOR=3).
Note that PROJ itself will ignore that item and always apply bilinear interpolation.<br>
<br>
<o:p></o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<ol style="margin-top:0cm" start="3" type="1">
<li class="MsoPlainText" style="mso-list:l1 level1 lfo3"><span lang="EN-GB">How should I supply the corrected GeoTIFF files to PROJ?<o:p></o:p></span></li></ol>
</blockquote>
<p class="MsoNormal"><span lang="EN-GB">Pull request against </span><a href="https://github.com/OSGeo/PROJ-data/tree/master/nl_nsgi"><span lang="EN-GB">https://github.com/OSGeo/PROJ-data</span></a>
<span lang="EN-GB"><o:p></o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<ol style="margin-top:0cm" start="4" type="1">
<li class="MsoPlainText" style="mso-list:l1 level1 lfo3"><span lang="EN-GB">Is it necessary for PROJ to use new files names to distinguish them from the old version with incorrect metadata?<o:p></o:p></span></li></ol>
</blockquote>
<p class="MsoNormal">No<br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<ol style="margin-top:0cm" start="5" type="1">
<li class="MsoPlainText" style="mso-list:l1 level1 lfo3"><o:p> </o:p></li></ol>
<p class="MsoPlainText"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoPlainText"><span lang="EN-GB">Regards, Jochem </span><o:p></o:p></p>
<p class="MsoPlainText"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoPlainText">[1] <a href="https://github.com/OSGeo/PROJ-data/tree/master/nl_nsgi">
https://github.com/OSGeo/PROJ-data/tree/master/nl_nsgi</a> <o:p></o:p></p>
<p class="MsoPlainText">[2] <a href="https://github.com/OSGeo/PROJ-data/blob/master/grid_tools/ntv2_to_gtiff.py">
https://github.com/OSGeo/PROJ-data/blob/master/grid_tools/ntv2_to_gtiff.py</a><o:p></o:p></p>
<p class="MsoPlainText">[3] <a href="https://github.com/OSGeo/PROJ-data/blob/master/grid_tools/vertoffset_grid_to_gtiff.py">
https://github.com/OSGeo/PROJ-data/blob/master/grid_tools/vertoffset_grid_to_gtiff.py</a><o:p></o:p></p>
<p class="MsoPlainText"><b> </b><o:p></o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText"><span lang="EN-GB">J. Lesparre<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">Netherlands Partnership Geodetic Infrastructure (NSGI.nl)<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><br>
<br>
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<o:p></o:p></span></p>
<pre><span lang="EN-GB">_______________________________________________<o:p></o:p></span></pre>
<pre><span lang="EN-GB">PROJ mailing list<o:p></o:p></span></pre>
<pre><a href="mailto:PROJ@lists.osgeo.org"><span lang="EN-GB">PROJ@lists.osgeo.org</span></a><span lang="EN-GB"><o:p></o:p></span></pre>
<pre><a href="https://lists.osgeo.org/mailman/listinfo/proj"><span lang="EN-GB">https://lists.osgeo.org/mailman/listinfo/proj</span></a><span lang="EN-GB"><o:p></o:p></span></pre>
</blockquote>
<pre><span lang="EN-GB">-- <o:p></o:p></span></pre>
<pre><a href="http://secure-web.cisco.com/1fXZS9zkl1X2JBd5DEK4YAq1gPWoDfSCpDSaFlOf5HpAUYrV7SIEw12ok2xJ1dLlvazjXyElbKEjEJLnTBo5NsMUQgMzUh1-_47mgVQpSA2Wih89heEKMsI5iXG5QbxXLAERdl1W-2up80jCvknOD8vY83_Wh-5g43WZIwWQNwaJ38eTscgBCOajh8Bgq8Xmw06STQekuuToXJWmYwQ6woQiNYlE3tHnjcvuhJOGF6aedm4xTRlC4hjYeQ9b8T3HPmwawXXFsXFnlPiuOSR06jIeZ0FCvBXtbexj0ZloQCmzM8W3sBGc11dNGXri3ia7w/http%3A%2F%2Fwww.spatialys.com"><span lang="EN-GB">http://www.spatialys.com</span></a><span lang="EN-GB"><o:p></o:p></span></pre>
<pre><span lang="EN-GB">My software is free, but my time generally not.<o:p></o:p></span></pre>
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