PIERO BENCINI
l6
strip but not in those of the adjacent strip taken some time later ; furthermore the
research of points, which will be carried out on diapositives at the stereocomparator,
to complete the monographies of the points, as mentioned in para. 3, may allow to
discover some points which had not been identified on the paper prints. However
the situation, as shown by the examinations of the diapositives, will not be likely
to undergo any major changes, but only some slight alteration.
Table n° 2 : Average longitudinal overlaps.
Strip Overlaps (%)
High Flight
A
80,2
61,1
61,5
55
B
80,3
60,2
60,3
56
C
79,7
60,0
60,4
57
D
79,8
59,4
59,4
58
E
79,i
58,8
58,7
57
F
80,1
59,7
6o,8
55
G
80,0
61,0
60,5
50
H
77,9
56,6
36,6
47
I
76,9
55,o
55,8
50
Low
Flight
a
79,5
59,3
59,4
56
b
79,2
58,1
58,7
54
c
79,o
58,0
58,0
56
d
79,7
59,7
59,8
56
e
79,4
59,i
59,i
t 53
f
80,0
60,1
59,9
55
g
79,i
58,5
58,6
54
h
78,0
5C4
55,9
51
i
80,5
61,5
61,1
55
l
79,4
58,6
59,i
51
m
78,8
57,7
57,2
48
n
80,0
59,7
60,1
53
0
79,o
58,2
58,3
53
P
79,7
58,8
58,7
48
Consequently there will be some strips, particularly the filling strips in the
central part of the polygon, which will have a number of points around 75 -4- 80 %
of those foreseen, i. e. enough to allow an exhaustive study ; there will however be
other strips, and particularly the setting strips at the borders of the polygon,
where the number of points falls below 50 % and decreasing up to 30 % in some
parts. In these cases the exploitation of photographs is much less profitable.
Therefore, whilst the operations of pegging out and determining the points on
the ground couldt be carried out satisfying all requirements laid down, the flights
for the photogrammetric surveys could be effected only in unfavourable condi
tions with regard to the success of the work, and the results were not as expected.
The ground work, however, is still usable in full and is under examination the
possibilty of effecting the flights again.
