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<p class="MsoNormal">Hi PROJ mailing list,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB">I am making a Geodetic TIFF Grid for the transformation between ETRS89 and Lowest Astronomical Tide of the Netherlands (<a href="https://epsg.org/crs_9289/ETRS89-LAT-NL-depth.html">https://epsg.org/crs_9289/ETRS89-LAT-NL-depth.html</a>).
<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">So this Geodetic TIFF Grid is of the type “VERTICAL_OFFSET_GEOGRAPHIC_TO_VERTICAL”. The description “geoid_undulation” seems unfitting, but if I choose something else like “lowest_astronomical_tide” PROJ doesn’t accept
it:<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">proj_create: Error 1029 (File not found or invalid): pipeline: Pipeline: Bad step definition: proj=vgridshift (File not found or invalid)<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">cct: Bad transformation arguments - (File not found or invalid)<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"> 'cct -h' for help<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Should I use the description “geoid_undulation” nevertheless, should I use something else for type instead of “VERTICAL_OFFSET_GEOGRAPHIC_TO_VERTICAL”, or should I make a feature request to support a description name
for “hydroid” models?<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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Another, thing I was wondering is how to deal with the difference between height and depth. Should the Geodetic TIFF Grid specify ETRS89 + LAT NL depth (EPSG:9289) as target CRS, so EPSG would only have to make transformation
code and a tif equivalent of the transformation method “</span><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#303030;background:white">Geog3D to Geog2D+Depth (txt)” (</span><span lang="EN-GB"><a href="https://epsg.org/coord-operation-method_1115/Geog3D-to-Geog2D-Depth-txt.html">https://epsg.org/coord-operation-method_1115/Geog3D-to-Geog2D-Depth-txt.html</a>)?
Or should the Geodetic TIFF Grid specify ETRS89 + LAT NL height (for which no EPSG code is available yet) as target CRS? I case of the latter, EPSG would need to make transformation code and an equivalent of the transformation method “Geog3D to Geog2D+GravityRelatedHeight
(txt)</span><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#303030;background:white">” (<a href="https://epsg.org/coord-operation-method_1098/Geog3D-to-Geog2D-GravityRelatedHeight-txt.html">https://epsg.org/coord-operation-method_1098/Geog3D-to-Geog2D-GravityRelatedHeight-txt.html</a></span><span lang="EN-GB">),
but also have to add an additional CRS code for LAT NL height, a Compound code ETRS89 + LAT NL height, and a transformation code LAT NL height to LAT NL depth based on “Height Depth Reversal” (<a href="https://epsg.org/coord-operation-method_1068/Height-Depth-Reversal.html">https://epsg.org/coord-operation-method_1068/Height-Depth-Reversal.html</a>).<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">Best regards, Jochem<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
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