Question

Aerial photography was taken at a flying height H ft above average terrain.

If the camera focal plane dimensions are 9 x 9 in, the focal length is fand the spacing between adjacent flight lines is X ft, what is the percent sidelap for the data given in Problem?

H 7000; f 88.90 mm; X 13,500

Answer 1

Answer:

% od sidelap is $P_w = 0.251\ or\ 25%$

Explanation:

Given data:

flying height is 7000 ft

focal dimension is 9× 9

focal length f = 88.90 mm

side width is x = 13,500 ft

we know side width is given as

$x = (1- P_w) \frac{w}{s}$

where s is scale and given as $s = \frac{f}{h}$

$13,500 = (1- P_w) \times \frac{\frac{9}{12}}{\frac{0.29}{7000}}$

$(1- P_w) = 0.748$

$P_w = 0.251\ or\ 25%$