25 -
Research (Mr. T. Bla-
nection with Wild Avio-
f tilts obtained is excel-
izon pictures in connec
te use of APR is consi -
would yield sufficient
land. - When perfor -
Lation) the first model
odel tilts 9 1 g and <o 1 g
ilts of both photographs
= -i-('P h 3 - ?' 3 ) and
[ the proper weighting
th horizon pictures an
rol points per 100 km^
>r the strip adjustment
3t 803, and graphical
iinates is extensively
m RMK H 18/ 10 came-
40 km = appr. 13 to 15
ph C5. Standard resi
ns are + 40 to 50 mi -
to 1/2 000. h, where
odetic Institute № 46",
instrumental time a -
computer time of 4 to
It is considered that
ierial triangulation wi-
such aerial triangula-
project to minimize
i (statoscope and A. P.
At present it is not
ation by means of the
vertical angle between
responding exposure
tilt is obtained by
ven by model-connec-
Ltude difference (bet-
3 used to take into ac-
n exposure station al-
ginning of the strip .
made to the commu-
Ddetic ground control
izontal adjustment of
istment of such aerial
sveling points, verti -
itrol is variable but
.vailable per strip. In
ertical control can be
Terence is made to
the communication " Analytical Aerial Triangulation at I. G.N. " prepared for the 1960 London
Congress [5]. Since 1960 strip adjustment by second degree transformation was introduced in
lieu of preliminary sections adjustment. - The accuracy attained in blocks covering an area of
1° x 1° (appr. 550 models) with a photo scale 1 : 50, 000 is given by the. following standard er -
rors : m x = my = m H = + 2. 5 m. The figures for the photo scale 1:13, 000 are (use of natural
points as ground control) : m x = m Y = m H = t 0. 75 m and Î 0.50 m for the photo scale 1:8 000.
For these aerial triangulations the Beaudoin Statoscope and the SOM-Poivilliers plate camera
f = 125 mm are used. It is planned to use in the future the Wild RC 9 super wide angle camera.
The aerial triangulations are performed with the SOM-Poivilliers Type B Stereotopographe, the
Stereocomparator Nistri, and the SOM Stereocomparator. Aerial triangulations performed com
prehend up to 7 2 photographs per strip, 48 strip triangulations, up to 972 photographs per block,
and 3 888 points (given and new points). - The required time per model at the stereotopographe
is 2 hours per model and operator, and 1. 25 hours per model and operator at the stereocompa
rators. Computation and adjustment amounts to 30 minutes per model and operator + 10 seconds
per model at the I. B. M. 7094 . - No information is available on cost comparison between ae -
rial triangulation with auxiliary data and without auxiliary data.
Germany :
The following institutions are concerned with the study of aerial triangulation with au
xiliary data (in connection with test for the OEEPE) : Institute of Photogrammetry, Topography
and Cartography, Institute of Technology (Prof. R. Finsterwalder), Munich ; and Institute for
Applied Geodesy (Prof. Gigas), Frankfurt. Only aerial triangulation with statoscope data is
considered using the Zeiss-Aerotopograph Statoscope with electric recording. - Strip triangu
lation with statoscope data is performed at the Zeiss Stereoplanigraph C8. bz-values computed
from the statoscope data are introduced and the relative orientation is performed with both 9
resulting in small 9 -alterations A 9 of the " fixed camera The adjustment- of such aerial
triangulation is performed according to procedures which will be explained in the OEEPE re
port to be presented at the Lisbon Congress. Reference is made to : " Aerial Triangulation
Strip Adjustment According to the Procedure Brucklacher " , by G. Hergenhahn, IBM 1620
Program Library No. 9. 7. 805 [3].
Great Britain (United Kingdom) :
The following organizations make use of or study aerial triangulation with auxiliary da
ta : Directorate of Overseas Surveys, Fairey Surveys, Huntings Surveys, Tellurometer (U. K. ),
and War Office (RE9). - As instrumentation to provide auxiliary data is used : Statoscope (Fai
rey Surveys, Huntings Surveys), Airborne Profile Recorder (Fairey Surveys, Huntings Surveys),
Horizon Camera (Fairey Surveys, Huntings Surveys), Doppler Navigator (Fairey Surveys, Hun
tings Surveys), Aerodist (Fairey Surveys for Tellurometer U. K. ). - Auxiliary data were used
in the following operations : Fairey Surveys ; Statoscope : Burma (1957-62), Egypt (1962).
A. P. R. : Aden (1959), Saudi Arabia (1963), South Wales (1959-63, Adjustment and evaluation
of work flown by Huntings Surveys). Horizon Camera : Bechuanaland Protectorate (1962-63),
Tanganyika (1963). Aerodist : Southern England (1960). Huntings Surveys ; Statoscope : Nigeria
(3 separate areas), West Africa (1960-63). A. P. R. : Nigeria (1959-60), South Iran (1962),South
Wales (1959), West Africa ( 1960-63). - According to Mr. Eden (Directorate of Overseas Surveys)it
is anticipated that in the future the combination APR-horizon camera should yield better results
than the combination Doppler-horizon camera statoscope. Mr. Smith (Fairey Surveys) considers
that the easily portable statoscope has a definite future as instrument to provide auxiliary data,
while that of the bulky APR would be more problematical. Horizon cameras are still being tested
with respect to the feasibility of producing good photographs. Mr.Mott (Huntings Surveys) sta
tes that the combination APR-horizon camera, and the use of inertial navigation for stable plat
forms to avoid the heading error presently produced by Doppler will be considered in the future
to provide auxiliary data. - From the available information follows that Huntings Surveys per -
form aerial triangulation with auxiliary data using stereo instruments. For the computations and
adjustments an Elliott 803 electronic computer is available. No further information is available
on how aerial triangulation with auxiliary data is performed. - As far as the ground control is
concerned which is used for the adjustment of aerial triangulations with auxiliary data different
