Another possibility to acquire legitimate aerial imagery for mapping is
to shoot it in-house by an specialized industrial UAV:
https://www.sensefly.com/ . And even consumer UAVs producers at last
start to design inbuilt HD camera with possibility of 90 degrees (down)
direction ( http://www.bladehelis.com/350QX3/ ) [though the photos from
the latter will require still an orthorectification, the process of
removing the effects of image perspective for creating a planimetrically
correct images]
On 02.06.2015 19:16, Chris Hill wrote:
Hi Andréa,
Following an exchange offlist I want to confirm that any image that
you trace from must be compatible with ODbL (that OSM uses). Simply
adjusting an image to trace from does not exempt you from copyright or
licence restrictions. If you do not have a suitable licence or written
permission to use the map image, please do not trace data from it into
OSM.
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