The scintillation effect has a somewhat larger amplitude
for the satellite images, because of their shorter exposure
times. It is of special interest to consider the data
obtained in Troms8, Norway, which are denoted by solid dots
in the upper portion of Figure 11. The precision of measur-
ments, as shown in the lower pattern on the figure, does not
display any pronounced anomaly, although the average is slightly
larger than the overall mean. However, the center pattern
showing the mean errors of the single camera adjustments,
indicates that practically all values are above average. As
a group, the Troms8 observations, with 63 reduced plates,
display, by far, the largest station mean error for the single
camera reductions with ±3.7 microns, compared to ±2.97 microns,
the average of all reduced plates. Significantly, the largest
mean error for a single camera reduction was encountered in
Tromsj3 with ±5.02 microns.
Similarly, the average of the curve fitting noise is ±4.3
microns in Troms8 against the overall average of ±3.0 microns,
having as its largest value ±8.4 microns, which appears to
gether with the largest mean error for a single camera reduc
tion on the above mentioned plate.
An analysis of the statistical results obtained from the
reduction of about six million coordinate measurements indicates
the following random error components.