I've been looking at one section of Africa and tagging untagged ways and area=yes ways. It's a very small % of the entire continent.
So far in the last couple of days I've tagged nearly 800 buildings and I have another 350 untagged ways to go through. Looking at the mappers and the profiles many of these seem to be from a number of recent building only projects. Now these should be some of the simplest things to map. Missing 1,000 buildings in this area alone by not tagging them to me is significant. It might not be to others. My estimate is of the buildings that are mapped 30% are not square or the building image and the mapping are different in size. This is a conservative estimate. To save my fingers and wading through the to_do list could a bit more effort be made on the JOSM building_tool plugin front. Jo / Polygot has a recipe for running it from a USB stick. It is simple to use and very difficult to misstag. You get more buildings out of the mappers and best of all you don't get 45 tiles on one project marked done as I've seen by a mapper who had mapped 186 buildings but managed not to tag them. This means the project data isn't reliable and in my experience end users like reliability. I'm not sure why, my programmers always thought that the speed the programs ran at was more important. Cheerio John
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