<p dir="ltr">When I need to map well buildings in a residential area I use in addition to satellite images the oblique low altitude aerial photos. Here are examples of such images, which I produced with the Phantom quad:</p>
<p dir="ltr"><a href="https://en.m.wikipedia.org/wiki/File:Bout-du-Monde-aerial-7.jpg">https://en.m.wikipedia.org/wiki/File:Bout-du-Monde-aerial-7.jpg</a></p>
<p dir="ltr"><a href="https://commons.m.wikimedia.org/wiki/Category:Tavria_B#/media/File%3AAltairovskiy-3.jpg">https://commons.m.wikimedia.org/wiki/Category:Tavria_B#/media/File%3AAltairovskiy-3.jpg</a></p>
<p dir="ltr"><a href="https://commons.m.wikimedia.org/wiki/Category:Bremgartenfriedhof?uselang=de#/media/File%3ABremgartenfriedhof-aerial-1.jpg">https://commons.m.wikimedia.org/wiki/Category:Bremgartenfriedhof?uselang=de#/media/File%3ABremgartenfriedhof-aerial-1.jpg</a></p>
<p dir="ltr">Such data fusion provides better understanding of an area. We can see not only buildings' roofs from above, but also what these buildings are, their height, etc.</p>
<p dir="ltr">An aerial image covers much larger surface than a "street-view" style image. So no need to store millions of photos for a town, as a dozen or two of 4K aerial images would give a good general idea of a place.</p>
<p dir="ltr">The RPAS are becoming lighter (the new DJI Spark is only 300 g), safer, cheaper, with better cameras.</p>
<p dir="ltr">I found so far only one practical way to connect the oblique low altitude aerial photos to the main stream OSM map, - it is via Wikimedia Commons (Wikidata). If you have an idea regarding this field, please, let me know.</p>
<p dir="ltr">Best regards,<br>
Oleksiy</p>
<p dir="ltr">Sent from my acer Liquid Z630</p>