Just found this video, HD camera mounted to a blimp and it gives you some examples of metres per pixel at various heights, up to 318m.
It doesn't appear that they are using a fish eye lense, so at a guess you might be able to get a similar scope from 150m as you do from 300m. _______________________________________________ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
