Page 136 - Introduction to Mineral Exploration

6: REMOTE SENSING 119

1 2 3 4 5 6
(a)

Coverage of
single photo 60%
overlap
Stereoscopic
(b) overlap area
1 2 4 5 6
3

Nadir line Edge variations
(ground trace of aircraft) caused by aircraft drift

(c)

Flight line

30% Sidelap

Sidelap

Aircraft drift
FIG. 6.8 Photographic coverage. (a) Showing the overlap of photographs during exposure. (b) A print laydown
of the photographs from a single strip. (c) A print laydown of photographs from adjacent flight lines
illustrating sidelap and drift. (Modified after Lillesand et al. 2004.)