Repeatability analysis of airborne electromagnetic surveys

Mathematics-in-Industry Case Studies

Table 2 Comparison of standard deviations for two chosen sections of the test line data

Nominal	No. of	Mean of	Standard Deviation
Altitude	Observations	Actual Altitude	of Actual Altitude
Section A: 3000–3500 m
90 m	415	91.1	3.76
85 m	438	84.7	6.26
80 m	418	79.4	4.06
75 m	441	74.3	5.21
70 m	397	69.7	4.35
65 m	426	65.1	5.80
60 m	408	56.9	4.41
Section B: 4800–5200 m
90 m	341	98.5	8.91
85 m	364	86.0	10.53
80 m	327	89.3	9.79
75 m	299	74.3	9.67
70 m	331	80.3	7.75
65 m	318	65.4	8.07
60 m	327	63.9	6.50

Note that there is no clear relationship between the standard deviations and the actual altitudes. Outliers (as discussed in Section “Cleaning of test ights data set”) have been removed