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<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">I agree with Martin
</span><span lang="EN-US">Desruisseaux that there are good reasons to want to restrict modifications in grid files. From a national geodetic infrastructure agency point of view, I feel uncomfortable with allowing users to alter the content of the grid shift
files. For the moment we do allow modification however, to promote the distribution and use of the official transformation. In an attempt to prevent users from altering the grid shift files or other parts of the transformation, we made the name of the official
transformation a registered trademark. We only allow the use of this trademark after written approval, and only if the correct transformation is used. To check the correctness of transformations we created a transformation validation website [1]. Here one
can download a dataset with 10000 points, transform these with a method of choice and upload the result. The transformation validation website will then give the percentage of points transformed correctly within 1 mm.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards, Jochem<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Netherlands Partnership Geodetic Infrastructure (NSGI)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[1] <a href="https://www.nsgi.nl/geodetische-infrastructuur/producten/programma-rdnaptrans/validatieservice">
https://www.nsgi.nl/geodetische-infrastructuur/producten/programma-rdnaptrans/validatieservice</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>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> PROJ <proj-bounces@lists.osgeo.org>
<b>On Behalf Of </b>Martin Desruisseaux<br>
<b>Sent:</b> donderdag 17 december 2020 15:57<br>
<b>To:</b> proj@lists.osgeo.org<br>
<b>Subject:</b> Re: [PROJ] NOAA VDatum Tidal Grids and PROJ CDN<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p>Le 17/12/2020 à 14:53, Sebastiaan Couwenberg a écrit :<o:p></o:p></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="moz-quote-pre">On 12/17/20 2:22 PM, Even Rouault wrote: <o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="moz-quote-pre">From our free software developer & user perspective, the ISO geodetic registry is no better than EPSG due to using quite similar terms of use than the EPSG one:
<a href="https://geodetic.isotc211.org/terms">https://geodetic.isotc211.org/terms</a> A true (and non custom!) open data license would make it a much more appealing alternative.
<o:p></o:p></p>
</blockquote>
<p class="moz-quote-pre">This cannot be seconded enough! Limiting modification makes inclusion in open source projects problematic.
<o:p></o:p></p>
</blockquote>
<p>I see two aspects in the EPSG/ISO license:<o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
A restriction on commercial use.<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
A restriction on modifications.<o:p></o:p></li></ul>
<p>I agree that the restriction on commercial use is problematic. But the restriction on modifications is more debatable, as there is legitimate reasons to want to protect data or standard integrity. Greg gave a good example of case where ability to make modifications
is desirable, but on the other hand there is also historical examples of damages caused by standards changed at project's will. The concept of "Open standard" is debated at a larger scale than us, and may be something open source projects should adapt to:<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p><a href="https://en.wikipedia.org/wiki/Open_standard">https://en.wikipedia.org/wiki/Open_standard</a><o:p></o:p></p>
</blockquote>
<p>We may argue that the current reality is that EPSG license does not fit well in MIT-licensed project. But for making progress we need to not only express our point of view, but also understand their concerns and see how we could address them.<o:p></o:p></p>
<p> Martin<o:p></o:p></p>
<p><o:p> </o:p></p>
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