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<div>I concur with the points made by Jean-Marc Liotier. As Deming said in the 50's, it is important to build quality into the process, not depend on checks after the fact.</div><div><br></div><div>Along those lines, I still think that we could have an AI program do a big part of the initial mapping.</div><div><br></div><div><br></div><div id="composer_signature"><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><div style="font-size:85%;color:#575757">Bryan Sayer </div></div><br><br>-------- Original message --------<br>From: Jean-Marc Liotier <jm@liotier.org> <br>Date: 07/02/2018 10:58 AM (GMT-05:00) <br>To: AMEGAYIBO Kokou ELolo <amazanake@gmail.com> <br>Cc: talk@openstreetmap.org, hot@openstreetmap.org <br>Subject: Re: [HOT] Why the HOT obsession with low quality buildings in
Africa ? <br><br>On Mon, July 2, 2018 11:55 am, AMEGAYIBO Kokou ELolo wrote:<br>><br>> The majority of these tasks were created in training workshops on<br>> OpenStreetMap in Bamako, quality control work is done afterwards by the<br>> local community normally. I share your points of view, but for training<br>> workshops it is our best method to channel, control the work of the<br>> newbies and also familiarize them with the use of the Tasking Manager.<br>> I am open to any contribution who can help us improving our approach.<br><br>I understand the difficulty of getting large numbers of new contributors<br>started with Openstreetmap - mistakes are normal and must be accepted as a<br>cost of growing the project. Nevertheless, I think that there are ways to<br>keep that cost lower.<br><br>First, and most important, I believe that quality control should not be<br>relegated to "done afterwards" - especially with less proficient<br>contributors who are most likely to make mistakes, and especially if they<br>are enthusiastic (it pains me to see incredible dedication in go to<br>waste). Quality control must be an integral part of the contribution and<br>that must be drilled into new contributors as early as possible. Insist on<br>using the JOSM Validator, have the users look at their own contributions<br>on Osmose... Show them how to be more responsible of their own work ! Or<br>course, having experienced users supervise is valuable but they are a<br>scarce resource and most importantly they risk infantilizing less<br>experienced contributors. Most of my own contributions start with looking<br>at Osmose, seeing a bunch of errors and I start editing there... Quality<br>control is a core skill for everyone, at every level of proficiency.<br><br>Second, have users. Creating data costs, maintaining it costs... Why are<br>we doing it ? We are doing it for users. How do we judge quality ? I am as<br>fond of the map as an aesthetic object as anyone here but we all agree<br>that we want to put our efforts to good uses - so we judge quality by the<br>fitness of the product for a particular use. If the data has no users, it<br>is dead data. For example, as a user, I am a walker and a cyclist - I<br>enjoy buildings on the map as landmarks to help me navigate... That is my<br>personal way of judging quality - but other users may have other ways: to<br>some users the purpose of having buildings in Openstreetmap may just be<br>"there is a building here and its shape is not that important" - and maybe<br>those users are the majority, who knows ? So, as a producer of data, be<br>aware of how the data is used - that is the key to rational quality<br>control. That remains true if you just chose the buildings as a new<br>contributor training object.<br><br>Third, make sure that the most recent imagery of decent quality is used.<br>For the specific case of Bamako and at the current time, ESRI World is<br>better than Bing: https://i.imgur.com/w6YBG70.jpg - of course, this is<br>subject to change over time. In understand that, for lack of available<br>properly surveyed geodesic reference points, large numbers of users<br>working with multiple sources of imagery generates its own challenges (I<br>found that particularly frustrating in Dakar's suburbs).<br><br>_______________________________________________<br>HOT mailing list<br>HOT@openstreetmap.org<br>https://lists.openstreetmap.org/listinfo/hot<br></body></html>