67 
me which 
1 work at 
triangulation « Massif Central » at The Ohio State University had to be classified 
between « little » and « average ». The personnel who performed the block triangulation 
at The Ohio State University consisted of graduate students. 
icient re- 
and test 
or. Also, 
tification 
personnel 
3 — STRIP AND BLOCK ADJUSTMENT 
It was first planned to perform these adjustments at the electronic computer 
« Recomp II » of the Washington, D. C. office of the Autometric Corporation. Also, 
the use of the IBM 7090 of The Ohio State University was considered. However, 
due to unexpected delays in establishing the necessary computer programs, caused 
nd were, 
tification 
partially by other commitments of the personnel involved, the strip adjustments 
and, to a certain extent, also the block adjustment had to be performed by using the 
graphical methods as described in [1]. Since the aerolevelling method was used the 
exposure station altitudes had to be computed from the statoscope data. By means 
of direct exposure station altitudes obtained from the absolute orientation of the 
151, 152, 
UO, 285. 
models at the ends and in the middle of each strip a parabolic adjustment of the 
exposure station altitudes was performed to yield the predetermined bz-values menti 
oned in Section 2-1. 
be corn 
er these 
First the principal strips T-1, T-2, and T-3 were adjusted using the following 
groups of given ground control points. (See Fig. 1): 
}f other 
» could 
ould be 
V of the 
d errors 
method 
3, 4, 5, 6, 1 
154, 155, 156, 157, 158, 159, / T-1 
236, 238, 297, 298, 299 ‘ 
19, 20, 21, 22, 25, ) 
173, 174, 175, 176, 177, T-2 
248, 251, 252, 286, 287 ' 
40, 41, 42, 43, j 
118, 119, 120, 191, 192, 193, 194, T-3 
264, 265, 267, 271, 272, 275 > 
Point No. 174 was later rejected by the Presidence of the Group of Study for 
Experimental Researches on Blocks of Strips. It should be investigated how much 
v^as also 
ts used 
filiation 
of such 
^ulation 
c trian- 
the use of this point has affected the accuracy of the block triangulation. 
The adjustment of the longitudinal strips 1 through 8, inclusive, was performed 
on the basis of points determined in the principal strips. All strips were adjusted 
graphically by means of three cross profiles and three longitudinal profiles (second- 
order non-conformal adjustment). The graphical-numerical block adjustment, as 
described in [1], was applied. 
: trian- 
degree 
tied as 
} block 
4 — CONSIDERATIONS AND ANALYSIS ON THE INTRINSIC RELATIVE AND ABSOLUTE 
ACCURACY OF THE TEST PERFORMED 
To illustrate the inherent accuracy of the test performed the coordinate diffe 
rences of the transfer points u, m, l common to successive models (see Fig. 2) were 
determined for all strips of the block triangulation.