<html><head></head><body>I always put survey+imagery in the last 3 cases. <br>Yves <br><br><br><div class="gmail_quote">Le 23 mars 2020 18:43:23 GMT+01:00, Greg Troxel <gdt@lexort.com> a écrit :<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k9mail"><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"> Subject: Re: [OSM-talk] Changeset Governance [was: Announcing Daylight Map Distribution]<br> From: Frederik Ramm <br><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #ad7fa8; padding-left: 1ex;">Nothing against the idea but what happened to the good old source tag<br>where source=survey would point to mappers on the ground, and<br>source=XYZ<br>aerial imagery would point to armchairing?<br></blockquote></blockquote><br>I'm very sympathetic to knowing the on-ground-ness of a change. But I<br>think it's shades of gray. This list illustrates what I mean:<br><br>* armchair<br><br>a place I have never been to, and which is so far away that I am not<br>familiar with the customs. An example would be me (US) editing in Africa.<br><br>* country-armchair<br><br>as above, but I know the country norms. Me editing in Glacier National<br>Park.<br><br>* local-armchair<br><br>as above, but I know the region norms. If I edited some town in MA<br>that I haven't visited (perhaps because I was going to visit), but I<br>generally know how things are.<br><br>* visited but mapping done by imagery<br><br>Here, I am editing a place where I've been at some point reasonably<br>recently and have some clue, but my edits are based on imagery.<br>However, my recollection is good enough to avoid most of the armchair<br>issues. An example is me fixing up crosswalks and sidewalks two towns<br>away, but not from field mapping notes. I don't consider this<br>armchair, but it's iffy.<br><br>* editing soon after a visit<br><br>I got someplace, maybe make notes, maybe remember, and edit based on<br>some combination of imagery, gpx tracks, notes and memory. I think<br>this is squarely not armchair.<br><br>* editing while there<br><br>Actually using an editor while being in the place being edited.<br><br><br><br>I would basically split this into three armchair and three not armchair.<br><br><br><br><br>So basically I think source including imagery does not really imply<br>"armchairing", in that the use of imagery is not the point, but a lack<br>of familiarity with what's on the ground. I almost always load and look<br>at imagery when editing after being in the field. I line up ways from<br>imagery when that works, becuase I have come to believe from experience<br>(with specific imagery sources) that this is more accurate than my gps<br>tracks.<br><br>(I have been experimenting with raw GPS data and post-processed PPP<br>solutions, and those I think are close to good imagery.)<hr>talk mailing list<br>talk@openstreetmap.org<br><a href="https://lists.openstreetmap.org/listinfo/talk">https://lists.openstreetmap.org/listinfo/talk</a><br></pre></blockquote></div></body></html>