<div dir="ltr">Marc,<div><br></div><div>I really have no experience handling snapshots or changesets. I wouldn't mind digging in, with some guidance though. Hackathon, anyone?</div><div><br></div><div>Anyway, in my processing, there's a phase where I parse quite a few tags. It wouldn't be hard to create a file which aggregates these tag changes/additions by users. When you have a file like that, you could take any spreadsheet editor and select just those users that have worked on subjects that interest you.</div><div><br></div><div>About map completeness: yes, sometimes external sources are nice. For example, road network length is available in the CIA factbook. But for a thing like a road network, assessing completeness can be done entirely with OSM data: in a graph like this one <a href="http://i.imgur.com/2hxAXNk.gif">http://i.imgur.com/2hxAXNk.gif</a> you can clearly see that the main road network is complete, but that we have a lot of work left to map "slow roads". Of course, that only works if sufficient people are working on something. For example, the same graph in Bolivia, or the number of monuments in Flanders might not allow for such statistical decisions on completeness because too few people are working on them. The same with imports.</div><div>In the case of landuse, it should be simple: if total mapped landuse approaches total area, you're there. But it's complicated, as polygons overlap each other all the time. So some GIS processing would be in order to decide on that. (I haven't found out how to do that in Postgres yet)</div><div>Of course, this kind of "completeness" measurements are always changing. Once all the ways of a road network are there, there are still a million details left to map. You could then plot the evolution of pedestrian crossings; or the percentage of roads mapped with maxspeed. (this I do know how to do)</div><div><br></div><div>So I don't think things that are "complete" will actually be mapped less. Imagine a map with all POIs mapped. POI related mapping might actually increase, with things like opening hours and websites becoming more relevant as data use increases. </div><div><br></div><div>Another conclusion: unless you have external sources to compare to, you need to look at history, not snapshot, to assess completeness.</div></div><div class="gmail_extra"><br><div class="gmail_quote">2015-11-10 17:31 GMT+01:00 Marc Gemis <span dir="ltr"><<a href="mailto:marc.gemis@gmail.com" target="_blank">marc.gemis@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote"><span class="">On Tue, Nov 10, 2015 at 8:17 AM, joost schouppe <span dir="ltr"><<a href="mailto:joost.schouppe@gmail.com" target="_blank">joost.schouppe@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div><br></div><div>As to the thing you want to do with similar mappers: does it have to be a history file? I'm not sure, and if it isn't, it's probably easier to do it on a snapshot. That would make regular updating also easier.</div></div></blockquote><div><br></div></span><div>On a snapshot is fine. No need to find who was mapping the same as me. </div><span class=""><div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div>That said, I can release some of my intermediate files as tables or csv, someone might be able to make some kind of website out of that. But that would again be with a local scope, as I don't have the capacity to process global files at once. (I cut up the world in little pieces to run analysis, but that means you need to finish a processing script before rolling it out, and I'm not good at finishing things)</div><div>Some of the questions you asked have little to do with local context, so it might be more interesting to see how a thing like taginfo works and build upon that.</div></div></blockquote><div><br></div></span><div> There national versions of taginfo for France and the UK. That is, they only look at the tags in 1 country.</div><div><br></div><div> I saw all my questions in local, Belgian context. E.g. is there someone else mapping heritage buildings in Belgium, or am I the only one ? If not, we could get in touch and exchange ideas specific for Belgium. (or Flanders or ...)<br></div><span class=""><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div><br></div><div>My personal interest is more about "map completeness" for road networks, landuse, amenities, etc; with a global scope. In the second place mapper inequality and remote mapping. For things like that, I don't see another approach than taking world history and cutting it in pieces...</div><div> </div></div></blockquote><div><br></div></span><div>Do you compare with an external source, or is something complete when less mappers are mapping it now compared to "yesterday" ? </div><div><br></div><div>My first interest is what are we (the Belgian community) mapping now. This is somehow related to your "map completeness", something that is complete, will no longer be mapped. I'm looking forward to see what you mean with complete :-)<br></div><div><br></div><div>regards</div><span class="HOEnZb"><font color="#888888"><div><br></div><div>m</div></font></span></div></div></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr">Joost @</div><div dir="ltr"><a href="http://www.openstreetmap.org/user/joost%20schouppe/" target="_blank">Openstreetmap</a> | <a href="https://twitter.com/joostjakob" target="_blank">Twitter</a> | <a href="https://www.linkedin.com/pub/joost-schouppe/48/939/603" target="_blank">LinkedIn</a> | <a href="http://www.meetup.com/OpenStreetMap-Belgium/members/97979802/" target="_blank">Meetup</a> | <a href="https://www.reddit.com/u/joostjakob" target="_blank">Reddit</a> | <a href="https://joostschouppe.wordpress.com/" target="_blank">Wordpress</a></div></div></div></div>
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