<div dir="ltr"><div dir="ltr"><div dir="ltr"><br><div class="gmail_quote"><div dir="ltr">Le sam. 15 déc. 2018 à 14:04, Colin Smale <<a href="mailto:colin.smale@xs4all.nl">colin.smale@xs4all.nl</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="font-size:10pt;font-family:Verdana,Geneva,sans-serif">
<div class="gmail-m_5956206386208340425pre" style="margin:0px;padding:0px;font-family:monospace">First time I have heard that as a (documented) rationale behind "ground truth".</div>
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<div class="gmail-m_5956206386208340425pre" style="margin:0px;padding:0px;font-family:monospace">Surely the stronger requirement is public verifiability, from a freely accessible, objectively reliable source. What is physically present in situ is a subset of that - but so are public records. This would make the mapping objective, in the sense that a random second mapper would be able to verify the correctness of the data and/or come to the same conclusion.</div></div></blockquote><div><br></div><div>+1</div><div>In France underground power lines maps are publicly available (and it should be a standard practice, INSPIRE from EU encourage it)<br></div><div><a href="https://opendata.reseaux-energies.fr/explore/dataset/lignes-souterraines-rte/map/?disjunctive.etat&disjunctive.tension&location=13,47.2096,-1.51929&basemap=f91575">https://opendata.reseaux-energies.fr/explore/dataset/lignes-souterraines-rte/map/?disjunctive.etat&disjunctive.tension&location=13,47.2096,-1.51929&basemap=f91575</a></div><div><br></div><div>Most of them aren't visible from the surface, sometimes you have red markers and that's all.<br></div><div>Nevertheless it's useful to add them (with careful integration as to not interfer with roads or something not related to) in OSM and there are no issue with verifiability since the operator gives many information</div><div><a href="https://openinframap.org/#13.22/48.85796/2.41832">https://openinframap.org/#13.22/48.85796/2.41832</a></div><div><br></div><div>All the best</div><div><br></div><div>François</div></div></div></div></div>