95
4.1.2. Columns 6, 7 and 8 indicate the square average of the residual
deviations of the control points after adjustment (d: ^ [ddfj iph e ir ma g n itude i
is an
indication for the accuracy of the transformation of the individual strips on the
control points along the strips.
4.1.3. Columns 10,11,12 show the mean square error of the determination
of individual points calculated from the coordinate differences of all points which have
been measured in two strips vs . This mean error characterizes the in
trinsic accuracy in the block. ^ n
4.1.4. The two strips No. 4 and 5 (specially marked in table II, IV and V)
indicate errors which are far beyond the normal, and are partly 4 times larger than
for the other 9 strips. When repeating the machine-aerotriangulation of these two
strips on a different plotting instrument residual errors of normal magnitude resulted
(please cf. table II strips No. 4' and 5'). A later examination showed that the
operator of these two strips No. 4 and 5 did not set the diapodtives into the picture
carriers correctly. Thus the longitudinal tilt in the orientation process was strongly
influenced.
The Official Report of the President and the graphic representations do not
contain the results of the repeated strips 4' and 5' since the repetition of the machine
aerotriangulation of these two strips could not been finished at the officially fixed
closing date for this part of the research work.
4.2. Error calculation.
The coordinate differences of check points (coordinates obtained from aero
triangulation minus geodetic coordinates) have been calculated in Milan.
4.2.1. A total of 29 points was eliminated from the complete number
of check points as being extremely faulty. These were
14 points because of faulty geodetic coordinates (according to information from the
President, Circular No. 7).
4 points because of calculating and typing errors.
11 points because of identification errors (according to identification sketches and
measuring protocols).
TABLE III — EXTREMELY FAULTY POINTS WHICH HAVE NOT BEEN CONSIDERED
Faulty geodetic coordinates
(information according
to Circular No. 7)
Calculating and
typing errors
Identification
.errors
Point No. 11
36
3
12
56
10
26
222
24
83
235
34
99
54
174
91
199
147
209
158
236
211
249
246
270
252
282
294
300