EE EEE
esse
N
92 AERIAL TRIANGULATION WITH AUXILIARY DATA, BRANDENBERGER
Holland
According to the report of Mr. Ligterink from Holland aerial triangulation with the
radar profile recorder was carried out in his country. The use of other auxiliary data
was not considered. The aerial triangulations using auxiliary data were performed in such
a way that the aeropolygon method was used and the auxiliary data obtained from the
radar profile recorder were only applied for adjustment purposes. Mr. Ligterink reports
that a large block triangulation using the radar profile recorder was performed by
K.L.M.-Aerocarto. As geodetic controls were available eleven astronomical points with
unknown deflection of vertical and six barometric points at one side of the block. This
block was photographed with the Wild RC5a camera [f — 6"] from a flight altitude of
6100 m and consists of approximately 90 strips and 3700 models respectively. The plani-
metric block adjustment was performed by Jerie's method [see Photogrammetria 1957-
1958, page 161]. The following accuracy was attained: relative errors — 9, 9 m, 7 172
microns in photoscale; absolute errors — qm ; FM, = 335 microns in photoscale. The ele-
vation adjustment was carried out by means of the barometric points and the auxiliary
data from the radar profile recorder. The following accuracy was reached: relative er-
rors — my = 125 microns in photoscale; absolute errors — 260 microns in photoscale.
taly
Professor Solaini from Italy reports that in his country aerial triangulation with
auxiliary data is especially studied at the Institute of Geodesy, Topography and Photo-
grammetry, Institute of Technology, Milan. At present an analytical strip triangulation
with periscope data is being performed (strip 5A of the O.E.E.P.E., S.O.M. 19 x 19 em
camera, flying height 4500 m above gr., 54 pairs, length of strip 100 km). The coordinate
measurement is carried out at the OMI stereocomparator TA-3. Special programs were
worked out by Ing. Inghilleri for the computation of strip triangulations at electronic
computers considering separate use of solar data as well as combined use of solar and
statoscope data. Professor Solaini expresses the opinion that it would be better to
exploit and improve the devices actually used for producing auxiliary data instead of
searching for new ideas and devices to procure auxiliary data.
Sweden
Dr. Hallert from Sweden reports that in his country no particular devices are used
to produce auxiliary data for aerial triangulation. He suggests in his report that more
efforts should be made to check and determine the accuracy of auxiliary data. In Dr.
Hallert’s opinion the development in the future will go in the direction of using increased
flying heights for aerial triangulation which would decrease the number of model
connection. To determine the accuracy of auxiliary data obtained from such devices as
horizon cameras, solar periscopes, gyroscopes, statoscopes and altimeters, Dr. Hallert
proposes the use of simple parallax meaurements by means of stereocomparators, mirror
stereoscopes and parallax bars. Such a procedure has been worked out by Dr. Hallert
and is based on formulas he has published in many periodicals (numerical relative and
absolute orientation). The basic idea of this procedure is to perform a numerical strip
triangulation according to the principle of aeropolygon. This strip triangulation is then
adjusted whereby adjusted values for bz, « and qv for each individual photograph is
obtained. These values should afterwards be used to check the accuracy of bz, « and
q-values obtained from such devices as statoscopes, horizon cameras, etc. Dr. Hallert
points out that with his procedure of numerical strip triangulation standard errors of
4 to 5° can be expected for the, individual w’s and ¢’s. Dr. Hallert furthermore points
out that in a strip triangulation orientation elements bz, w, @, ete., obtained from an
aeropolygon triangulation as well as from additional devices (auxiliary data) should
be determined as weighted means of both bz, « and q-values.
— tue
— — —
ES
