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<p class="MsoNormal"><span style="color:#1F497D">Hello Karin,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">As long as your grids are released on a suitable open source compatible license, yes it is possible to add them to PROJ. If you are quick (as in today) and open a pull request in the proj-datumgrid
repository [0] it can become part of the coming version 6 of PROJ. I am not sure if transformations to and from EPSG:31370 will be using the grids by default without also modifying the source code of PROJ. Even Rouault should be able to clear that up though.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">/Kristian<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">[0] <a href="https://github.com/OSGeo/proj-datumgrid">
https://github.com/OSGeo/proj-datumgrid</a> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="mso-fareast-language:DA">Fra:</span></b><span style="mso-fareast-language:DA"> PROJ <proj-bounces@lists.osgeo.org>
<b>På vegne af </b>Praet Karin<br>
<b>Sendt:</b> 14. februar 2019 15:53<br>
<b>Til:</b> proj@lists.osgeo.org<br>
<b>Emne:</b> [PROJ] request for integration of optimized transformatiegrid BD72 to ETRS89<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif">The Belgian National Institute of Geography (NGI) has published a more accurate transformationgrid to convert between Belgian Datum 1972 tot ETRS 89.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif">As Belgian Lambert 1972 (EPSG:31370), based on BD72, is widely used in Belgium – is it possible to integrate this transformationgrid as the default transformation
for this datum?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif">Documentation in Dutch: <a href="http://www.ngi.be/NL/NL2-1-7.shtm">http://www.ngi.be/NL/NL2-1-7.shtm</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif">Documentation in French:
<a href="http://www.ngi.be/FR/FR2-1-7.shtm">http://www.ngi.be/FR/FR2-1-7.shtm</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif">The grid is called: bd72lb72_etrs89lb08.gsb
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif">Karin Praet<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif">Provincie Limburg, Hasselt, Belgium<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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