<div dir="ltr">When you say "low quality" buildings, do you mean the quality of the polygon data or are you judging someone's home to be of low value?</div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jul 2, 2018 at 1:24 AM, Jean-Marc Liotier <span dir="ltr"><<a href="mailto:jm@liotier.org" target="_blank">jm@liotier.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Active in Senegal and Mali, I have noticed that changesets tagged with<br>
tasking-manager HOT projects produce very large numbers of buildings.<br>
Those buildings appear to be of very low quality. I wonder: who uses<br>
this data ?<br>
<br>
If it is only necessary to assess that people live there, then a<br>
landuse=residential is sufficient<br>
<br>
If it is necessary to count the number of dwelling units to infer<br>
population, then a node is sufficient (maybe along with an attribute to<br>
discriminate single or multi-tenancy)<br>
<br>
If the geometry is actually necessary, then I wonder if anyone is<br>
satisfied with those semi-random shapes that, with some optimism, may be<br>
identified as being in the vicinity of actual buildings (most of the<br>
time)<br>
<br>
Enthusiastic contributors expend an awful lot of effort in flooding the<br>
map with low-quality buildings. I have seen ruins, building parts,<br>
walls, vague shadows on the ground, rubbish heaps, market stalls, cars<br>
and trucks all tagged as buildings - and I'll charitably keep from<br>
commenting on the geometric quality of those that attempt to map actual<br>
buildings (and I'll leave aside the issue of HOT leads requiring the use<br>
of outdated imagery such as Bing instead of ESRI World in Bamako). Is it<br>
the most useful way to channel the energy of inexperienced contributors<br>
?<br>
<br>
I often find myself wishing that HOT leads introduce them to<br>
Openstreetmap through Osmose quality control rather than by churning out<br>
buildings like demented stonemasons trying to reach their weekly quota<br>
of gamified task-managing !<br>
<br>
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</blockquote></div><br></div>