[Openstreetmap] Areal photos for free?

[Andy Armstrong]

On 18 Feb 2005, at 16:19, Petter Reinholdtsen wrote:
> The camera and the gps should be close to each other to make sure the
> position error of camera matches that of the position error of the
> gps.  (Is this really necessary, if the relative position of the GPS
> and the camera is know?)

The parallax error due to not knowing exactly which direction the 
camera is potentially huge compared with any error due to the relative 
position of the GPS and the camera. It's also a /really big job/ to 
photograph the whole country from a light aircraft - or even any 
significant area. In addition aren't there huge no-fly zones for light 
aircraft? Significantly they'd be over cities.

-- 
Andy Armstrong, hexten.net