Many humanitarian groups use buildings as a rough proxy for population (density), or to ensure every household is covered during a vaccination campaign, or simply to navigate. Likely they use them for a combination of the three. As Phil says, it’s best to read the specific task.
As a side note, it’s helpful to be more specific than the entire continent of Africa, which is a very, very large and diverse place. If you can note individual problematic countries, as Frederic does, it helps us to identify sources of error or verify there was a legitimate humanitarian or community-building reason behind any fall in quality. On Mon, Jul 2, 2018 at 4:16 PM Warin <61sundow...@gmail.com> wrote: > On 02/07/18 18:52, Frederik Ramm wrote: > > > Hi, > > > > On 02.07.2018 10:24, Jean-Marc Liotier wrote: > >> churning out buildings like demented stonemasons trying to reach their > weekly quota > >> of gamified task-managing ! > > I recently stumbled upon > > > > https://www.openstreetmap.org/#map=15/-6.8958/39.1623 > > > > (Tanzania) and had a similar thought. The buildings there are at least > > square and largely match aerial imagery, but this, too, looked like > > supercharged one-trick-pony image tracing combined with very little on > > the ground knowledge (e.g. quite a few roads and tracks clearly visible > > on the imagery are not traced, and from someone local you'd expect the > > occasional POI or label). > > > > Someone must have buildings very high on their priority list (don't even > > know if HOT are involved but it certainly doesn't look like local > mapping). > > > > It will be interesting to learn why buildings are so important. Or are > > they just the lowest-hanging image tracing fruit, or just easier to > count? > > > I have been mapping a few buildings lately - mainly to add addresses to. > Past mappers have placed a few POI ... but they tend not to be too precise > - e.g. between buildings or on the footpath. > Once the building outline is there then you see the discrepancy. And any > further additions of POI can be guided by the building outlines. > > I hope 'my' buildings are a little better that what is described above, > some of that depends on the imagery, > some in the pride of workmanship and some on the fatigue of the mapper. > Certainly any HOT manager who rewards the number of things done should be > alert to the quality reduction that such motivation brings. > > One of the good things about adding addresses .. you notice things like > the road name is wrong. > > > _______________________________________________ > talk mailing list > talk@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk >
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