If you are using the JOSM editor, I can highly recommend this plug-in: http://wiki.openstreetmap.org/wiki/JOSM/Plugins/BuildingsTools
It allows you to trace simple rectangular buildings much faster. On 29 April 2015 at 12:35, Max Bainrot <mbain...@gmail.com> wrote: > I am quite new too (having done only 1 quarter tile before for South Sudan > Ebola crisis and a little bit of mapping in my local area) and I can relate > to your frustration, what further compounds things is the countries > cultures, building style, etc can and often are different to that of where > you live/have experienced > > What I do when I have a hard time identifying features is zoom in and out, > usually that helps with the low resolution and sometimes the stitching > obscures things on one zoom level but goes away on a different zoom level > > Usually you can see a contrast that forms an X or a line in the center > which is the roof capping and that's a pretty good give away > > Another one depending on the imagery is shadows, they give you a really > good idea of what a given structure is and how high it is (thus helping you > decide if its a short wall/hedge or a proper fence) > > Also try cycling between different imagery and that can help identify > structures due to different times of day captures, etc > > When I was helping out with the Sudan Ebola outbreak I found it a lot > easier to cycle between bing and the other imagery (my memory is bad > sorry), one was quite bright but low res the other was higher res but alot > darker with longer shadows, between the two it helped me identify what > looked like small buildings to be vans as well as highlight buildings that > weren't visible in the other imagery > > Another thing that helps you learn is in your editor (I use JOSM, not very > beginner friendly but it's worth it IMHO) is to toggle your DATA layer (the > layer all the polygons are on) that'll make it easier to see whats beneath > other peoples work and help you learn what buildings, carports, outdoor > toilets/wells look like on the sat photos/aeriel photographs > > After a short time you'll get to know certain ground features (random dirt > clearings, weird bright reflections, etc) that give away that there is a > structure there/nearby and it'll make things easier. > > Cheers, > Max > > _______________________________________________ > HOT mailing list > HOT@openstreetmap.org > https://lists.openstreetmap.org/listinfo/hot > > -- Dan Marsh http://www.dm-photographics.com
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