Figure 1
TARGET FOR PLACEMENT ON
MARKERS OF SURVEY CONTROL
\
N QN
Leg for ease in finding NX
t t t
arget on photographs S X
N s
Dirt.) yS' , in which S' = photography scale in
5 feet to one inch.
D (ft.) „/_3_ » in which S is the denominator of the
300 representative fraction
of the photography scale.
D (meters) = a S x, in which S is the denominator of
3,000 the photography scale
expressed as a representative
fraction.
A significant advantage of this target design is that the
target size determined by use of these equations for a
particular photography scale will be adequate for photog-
raphy of all larger scales, but not vice versa.