REPORT OF COMMISSION V 
Plane 3: 
(11.90) (138.2 — 4.07) 
= — = 5.97 millimeters. 
(1.935) (138.2) 
Plane 4: 
(4.05)(138.2 — 5.96) 
W ı = —  ———— — — — — — — — = 2.00 millimeters. 
(1.935) (138.2) 
10) Summary of measured data: 
Micrometer Photographic Absolute Relative 
Dimension Measurement Measurement Error Error 
.04 mm. --0.05 mm. +2.5% 
.07 mm. --0.01 mm. +0.2% 
.96 mm. —0.04 mm. —0.7% 
.01 mm. +0.01 mm. +0.1% 
.97 mm. —0.03 mm. —0.5% 
wv 
.00 mm. 0.00 mm. 0.0% 
hi2 1.99 mm. 
his 4.06 mm. 
hia 6.00 mm. 
Ws» 10.00 mm. 
Ws; 6.00 mm. 
Wa 2.00 mm. 
Ur # IN 
N nO 
CONCLUSIONS 
The accuracy of the equipment together with the simplified procedure 
exceeded expectations. The basic principles comprising the system can be uti- 
lized, in many instances, for special applications within science and industry. 
Increased production and accuracy requirements can soon justify the amor- 
tization of more elaborate photogrammetric plotting equipment and the related 
refinements. 
RECOMMENDATIONS 
If greater accuracy is required, it is recommended that the camera base be 
increased inasmuch as the vertical accuracy is directly proportional (approxi- 
mately) to the camera base (B). For instance, the camera base for the previous 
example is 
= 18.2 millimeters. 
If the camera base were doubled to 36.4 millimeters and all other factors re- 
mained constant, the elevation errors would be reduced one-half. If the base 
were doubled, it would become necessary to use a wide-angle lens. Convergent 
photography can be utilized in place of a wide-angle lens, but the solution be- 
comes more involved. 
The base-height ratio for the numerical example is 
The base-height ratio for vertical aerial photography exposed by a 6 inch focal- 
length lens on a 9X9 inch format with 60 per cent overlap is 0.60 or 4.6 times 
greater than the 0.13 ratio of the Donaldson Stereo-Camera at a scale of 2. 
If the height errors of the numerical example were reduced by a factor of 4.6, 
the maximum error would be 0.01 mm. 
The aluminum test object in this report was specifically chosen inasmuch 
as it could be easily measured by means of a micrometer for comparison with 
the photographic method. However, if a pencil attachment is secured to the