Photogrammetry. Introduction. Photogrammetry: the science, art, and technology of obtaining reliable information from photographs. Two major areas: metric, and interpretative. Terrestrial and aerial Photogrammetry.
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H - h
H - havg
If the f, H, and h are not available, but a map is available then:
X map scale
Photo Scale =
Xa = xa * (photograph scale at a)
Ya = ya * (photograph scale at a)
where: r is the radial distance on the photo to the high point
h : elevation of the high point, and H is flying height above datum
ra/R = f/H
Or: ra *H = R * f ----(1)
rb/R = f/(H-h)
Or: rb * (H-h) =R * f ---(2)
Then from (1) and (2);
ra *H = rb * (H-h) then;
D = rb - ra = rb *hb /H
L2 = (XB - XA)2 + (YB - YA)2
then solve the same equation again replacing the ground coordinates with the photo coordinates.