that horizon picture 
in strip triangulation 
auxiliary data for the 
etsundersokning avHo- 
try, KTH, Stockholm 
there is no immediate 
>eing performed in con- 
Statoscope and the ho- 
¡tereomicroscope is 
are presently in pro - 
be given at this time, 
msidered. 
ountry it is felt that 
y data. Nevertheless 
A. P. R. - data. Fur - 
iary data, is also stu- 
d from this institution. 
e. 
of aerial triangulation 
available at this time. 
"ovide auxiliary data 
: 250, 000 scale map- 
3an of obtaining hori- 
ground control is vir- 
~onic horizontal con - 
mtrolled photography 
tography. - To obtain 
and y are determined 
mal instrument rea - 
- 800. Individual strip 
und with a 6 " wide 
east squares ad just- 
ingulation points to 
tations. - Ground con- 
ingulation) are located 
shed by airborne elec- 
't. - The accuracy of 
ig requirements. - In 
Lan hour per model for 
sed. It is felt that 
zy can be obtained, 
y data. - Currently 
s camera designed by 
plate camera cones 
mounted in a back-to-back arrangement. It is hoped to achieve with this camera system a stan 
dard error for the direction to the sun less than 5". - A test is presently being performed 
using a strip of 60 photography (photoscale 1 : 45, 000 overlap 80 %) with a length of 80 miles 
over the Ohio test area. The aero-triangulation will be performed according to Dr. H. Schmid's 
analytical methods using minimum ground control and independent base lines and azimuths. 
Surveying Department, School of Civil Engineering, Cornell University 
Research is performed in the field of aerial triangulation with auxiliary data using ana 
lytical and instrumental aerial triangulation. Analytical aerial triangulation research covers the 
following subjects : " Two-Directional Triplets in Sub-Blocks " (E. M. Mikhail) and " Analyti 
cal Aerotriangulation Using Triplets " (J. M. Anderson). Methods have been developed to incor 
porate any type of auxiliary data into the computational solution of aerotriangulation (airborne 
determined exposure station positions, tilts, etc.). This data is assessed for reliability and 
weights are assigned for this data in the solution of parameters based upon the xyz photo coor 
dinate measurements and any other ground control data provided. - In instrumental aerial tri - 
angulation using the Wild Autograph A7 with EK3 electric coordinate printer research was per - 
formed on high-altitude photography strip triangulation to determine ground control for low-al 
titude mapping photography. Since this procedure is not considered as aerial triangulation using 
airborne determined auxiliary data no further details are given on this method in this report.lt 
is however felt by this agency that the method would be much cheaper and more economical than 
any other method available. 
Fairchild, Aerial Surveys 
In this organization aerial triangulation with auxiliary data is used by occasion. In a 
survey job in Afghanistan (see " Photogrammetric Engineering ", Dec. 1960) APR data was a- 
vailable but not in a suitable form. Instead the readings of the barometric altimeter which ap 
pears on the aerial film of the T-ll camera were taken to the nearest 5 ft, although it was con 
sidered that relative exposure station altitudes probably might be good to only 10 ft. These data 
were used in performing aeroleveling strip triangulation by introducing pre-computed bz-values 
in the Zeiss Stereoplanigraph C8 which resulted in reduced strip closure errors. The adjust 
ment of the strips containing appr. 20 models was done by means of Shoran control at both ends 
and in the middle of the strips. No accuracy information is available for these triangulations. - 
For the future it is planned to use the hypsometer portion of the APR as a statoscope. 
U. S. Forest Service 
This agency does not use aerial triangulation with auxiliary data and it is not planned to 
experiment with auxiliary data due to lack of equipment. 
U.S. Army Engineer, Geodesy, Intelligence and Mapping Research and Development Agency 
Work of this agency is generally not directly relevant to aerial triangulation with auxi 
liary data. An exception is a test carried out on the " Dual Aircraft Mapping System " (see pa 
per by Q.C. Angelis, Photogrammetric Engineering", July, 1962). 
U. S. Geological Survey 
In this agency aerial triangulation is performed using the stereotemplet method, the 
Wild A7 Autograph, the Wild A8 Stereoplotter and the Zeiss Stereoplanigraph, but without using 
auxiliary data. 
Photographic and Survey Branch, J-2, Joint Chiefs of Staff 
The U. S. Air Force is presently concerned with a new development program to design 
an " Integrated Photogrammetric Mapping System " (USQ 28) for world-wide photo mapping mis 
sions. Reference is made to : " A New Approach to Aerial Map Data Acquisition and a Global 
Operational Concept " by colonel George W. Humbrecht, Photographic and Survey Branch, J-2, 
Joint Chiefs of Staff ; " Photogrammetric Engineering ", September, 1963 [4] and "TheAN/USQ 
-28 Mapping Survey Sub System " by Major Walter M. Robson, Headquarters 1360 th Air Base 
Group, Air Photographic and Charting Service (MATS), U.S. Air Force, Orlando A. F. Base, 
29 -