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Title
Transactions of the Symposium on Photo Interpretation

236
SYMPOSIUM PHOTO INTERPRETATION, DELFT 1962
Results
Analysis of variance based on photo interpretation of images of eight species
replicated 19 times, showed the following:
1. Interpreters. No statistically significant difference in accuracy was detected
in observations made between any two photo interpreters on color film
when their means were compared by Tukey’s range test. However, there
was a difference on panchromatic film.
2. Film. There was a highly significant difference between accuracies of inter
pretation on color transparencies and panchromatic photographs. Inter
pretations were significantly more accurate on color transparencies at all
scales.
3. Photographic scale. Differences in interpretation were highly significant
between all scales on panchromatic film. On the color transparencies, the
two larger scales were almost equally accurate; and both were significantly
better than the 1 : 3960 scale at the .01 level.
4. Tree species. Interpretation differences between tree species were highly
significant. (Some tree species can be identified more accurately than
others).
Photo scole
Fig. 1.
str
obus
S'
s
^ Thujo occid

enta U
s
ЯГ-
trifer
a
K3960 11584 i: 1188
Photo scale
Fig. 3.
Panchromatic
Pinus
Thuja
Pinus
Pinus
Picea
Abies
Acer
Populus
Betula
»trobus
iccidentalis
resinosa
bonksiona
»pp
balsomifera
rubrum
tremuloides
papyrifera
95
81
80
80
77
73
70
59
44
Super Anscochrome
Pinus
strobus
Pmus
P.ceo
Spp
Pinus
resinosa
Thuja
Abies
bolsomifera
rubrum
Populus
tremuloides
Betula
papyrifera
97
96
88
88
86
84
73
64
56
Fig. 1. Effect of scale and film on photo
interpretation accuracy. Average of 5 in
terpreters - all species
Fig. 2. Species ranked in order of inter
pretation accuracy - in per cent. Average
of 5 interpreters - scale 1 : 1188
Fig. 3. Effect of scale on photo inter
pretation accuracy for 3 tree species on
color film. Average of 5 interpreters
Fig. 2.