[OSM-talk] [OSM-legal-talk] Yahoo and OSM
lists at riscott.ukfsn.org
Fri Mar 30 15:08:01 BST 2007
On Friday 30 March 2007 14:27, Martin Spott wrote:
> Good aerial imagery is taken using markers placed at predefined ground
> locations _plus_ a very good GPS _plus_ gyroscopes that allow you to
> determine the pitch and bank angle of the aircraft. Additionally you
> should have a radar altimeter that allows you not only to determine the
> displacement of images against GPS location that occurs due to pitch
> and bank but also delivers the required altitude information in order
> to correct the deformation that you get by projecting the image onto
> the terrain.
It looks like my assumption that standard rubbersheeting and enough control
points would be able to sort out this problem was rather optimistic.
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