[OSM-talk] Aerial imagery [was Yahoo and OSM]

Martin Spott Martin.Spott at mgras.net
Fri Mar 30 16:18:46 BST 2007

"David Earl" wrote:

> I suppose it depends on the area covered by each picture, but if I can
> identify four known points in a picture from my ground survey, and an editor
> offers the ability to align points in the picture with points from my own
> surveying, distorting the picture appropriately into a quadrilateral, I
> think aerial pictures (indexed by location, which can be a simple GPS
> reading) would probably be useful with no calibration at all.

Expect to require at least six reference points on the ground to make
this distortion work with moderate accuracy. "We" certainly will
perform a few test-runs this summer, simply by taking a few pictures
while we're on a trip. I'll let you know if it works out (unless
someone else already does his/her tests in the meantime),

 Unix _IS_ user friendly - it's just selective about who its friends are !

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