<div dir="ltr"><div>Tom,</div><div>I think the description is rather unclear as to what the polygons are made of. Lars-Daniel's original description made it down like they were OSM polygons combined with each other, or otherwise simplified of details. A quick glance at the website seemed to confirm this.<br></div><div>OTOH, his second email says "the edges of many polygons go across areas, where no OSM elements could have been used as a reference." That does make me wonder whether the polygons were actually created from OSM data, with 3rd party data added or not. Looking at the website again, I see a few examples where a polygon does not match the road network, but do appear to match other polygons OSM (assuming that some OSM polygons have been combined or simplified). <br></div><div>(Another possibility is that the polygons do not originate from OSM data, but were snapped to the OSM road network for visualization purposes only. I don't think there's enough information to know.) <br></div><div>
Again, not conducting a comprehensive survey here, but if 95% of the polygons match OSM polygons, then even if there is technically a derivative database, then I think this simply isn't worth our time to investigate.</div><div>Best,</div><div>Kathleen<br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Oct 24, 2020 at 2:02 AM Tom Hummel via legal-talk <<a href="mailto:legal-talk@openstreetmap.org">legal-talk@openstreetmap.org</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">Hi Lars-Daniel, Kathleen,<br>
<br>
> The process doesn't seem to be trivial, since the edges of many polygons go across areas, where no OSM elements could have been used as a reference. So OSM dataset has either been changed or augmented using 3rd party reference (knowledge, imagery, data etc.) to create the product. Those changes are share-alike by ODbL.<br>
<br>
The Trivial-Transf.-Guideline asks a trivial transformation to be<br>
judged from a non-technical point of view. The quality of the<br>
transformation itself should be non-trivial.<br>
<br>
You explained, how the edges of some polygons go along edges that may<br>
be very difficult to obtain, as they can’t be found within OSM. While<br>
Kathleen seems to assume that they are directly and easily derived from<br>
OSM data. Is that right?<br>
<br>
OTOH that doesn’t seem important under the TTG. The TTG asks us to<br>
estimate the modification or addition itself. You seem to be certain,<br>
the modifications are only possible by combination of 3rd party data<br>
and OSM data. From that perspective, they don’t seem very trivial to me.<br>
Kathleen?<br>
<br>
Thanks<br>
<br>
Tom<br>
<br>
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