b. Low Oblique. This is a photograph taken with
the camera inclined about 30° from the vertical (Figure
8-3 and 8-4.) It is used to study an area before an
attack, to substitute for a reconnaissance, to substitute
for a map, or to supplement a map. A low oblique has
the following characteristics:
(1) It covers a relatively small area.
(2) The ground area covered is a trapezoid,
although the photo is square or rectangular.
(3) The objects have a more familiar view,
comparable to viewing from the top of a high hill or
tall building.
(4) No scale is applicable to the entire
photograph, and distance cannot be measured. Parallel
lines on the ground are not parallel on this photograph;
therefore, direction (azimuth) cannot be measured.
(5) Relief is discernible but distorted.
(6) It does not show the horizon.