(map aerial photographs) (2-8)
FRAME 2-9.
The tentative findings of the map and aerial photo reconnaissance are verified first by _____________________
observers, then by _____________________________ parties who actually enter the area to obtain such data as
slope measurements, radii of curves, soil samples, bridge and tunnel data, etc. The three methods thus
___________________ provide maximum information.
(relief) (2-32)
FRAME 2-33.
Ordinary aerial photos contain inherent scale and image distortions, making distance and azimuth
measurements unreliable. Special grids must be constructed for point location.
Aerial photos cannot replace maps for ___________________________________ purposes, because they have
inherent __________________________ in scale and image.
2-19
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