<div dir="ltr"><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 12 Apr 2024 at 16:31, Howard Butler <<a href="mailto:howard@hobu.co">howard@hobu.co</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"><br>
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> On Apr 12, 2024, at 5:56 AM, Javier Jimenez Shaw via PROJ <<a href="mailto:proj@lists.osgeo.org" target="_blank">proj@lists.osgeo.org</a>> wrote:<br>
> <br>
> Maybe you want to talk with your local agency to fix this ;)<br>
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It is not always clear as a motivated-but-unconnected individual which local agency and person inside it to contact to sort things out.</blockquote><div>That is the first step, true. Contact details in the webpage of the agency sometimes work. If not, networking is the key. Ask to your network if anybody knows somebody in that agency. They are usually not that big (not that many people is in geodesy). That's why I am asking here: it is much easier for locals to reach that people. Speaking the local language also helps.<br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> It is also often the case that some government officials might not feel they have the power to change the license</blockquote><div>I see. But many times it is simpler than expected. Just asking works to change to a valid license. Other times they can use two licenses. For instance the author changed the license in <a href="https://www.isgeoid.polimi.it/Geoid/America/Argentina/argentina2016_g.html">https://www.isgeoid.polimi.it/Geoid/America/Argentina/argentina2016_g.html</a> Also some clarifications are useful. In some pages it is simply not clear the license that applies, because nobody cared before. I was very happy that Portugal quickly made it explicit CC BY 4 when I asked that.<br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> or releasability of a model.</blockquote><div>That can be a problem. I know some countries that are afraid of that. But showing how many other countries are releasing their models could help. It is also information needed by the citizens/companies of that country. Keeping it secret destroys the purpose of such a tool.</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> Finally, getting an official grid to PROJ CDN might require navigation of the procedures of a specialized geospatial standard body (EPSG) and standards conformance of those grids before official registration. <br></blockquote><div>Fortunately geoid models are simple to register, and EPSG is usually quick including this kind of requests. There are several grids just as an ascii file with "lat, long, undulation". Not the most compact format, but easy to understand (recently I explained to an agency how to use GDAL to manage those formats. They were very happy!). See that the geoid model file is not uploaded to EPSG, but just mentioned (as a filename). The agencies are "responsible" of making it accesible (something not always the case).<br></div><div> <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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A step-by-step process document written by people who have completed it would be a helpful guide of all the various starting points and steps. <br>
<br></blockquote><div>There is already some documentation in <a href="https://github.com/OSGeo/PROJ-data/blob/master/CONTRIBUTING.md">https://github.com/OSGeo/PROJ-data/blob/master/CONTRIBUTING.md</a> , but it's true it starts when you have all the data. I will make a PR trying to explain the previous processes based on my experience adding some geoid models there.</div><div><br></div><div>In any case I am happy to help anybody that wants to add a grid file to PROJ. If you have data or contacts, just contact me in this mailing list or personally.</div><div><br></div><div>Cheers,</div><div>Javier.<br></div></div></div>