DESERT SEARCHES: THE EFFECTIVENESS OF HELICOPTERS
Table 3 may be used to determine the range of values for the cumulative POD obtained by searching an area multiple times with a helicopter in bright, sunny conditions. In this table, the column on the left is the number of times the area is searched; the row across the top is the confidence level required. Each square in the body of the table contains two numbers: the cumulative POD corresponding to the smallest and largest interval values for the single pass POD given in Table 1 or Table 2.
TABLE 3
Multiple Pass POD for BRIGHT, SUNNY CONDITIONS
|
Confidence Level
|
|
|
0.400
|
0.500
|
0.600
|
0.700
|
0.750
|
0.800
|
0.850
|
0.900
|
0.950
|
0.990
|
0.999
|
|
Passes
|
|
|
|
|
|
|
|
|
|
|
|
|
1
|
0.229
|
0.216
|
0.203
|
0.188
|
0.180
|
0.170
|
0.159
|
0.146
|
0.126
|
0.093
|
0.063
|
|
|
0.366
|
0.380
|
0.397
|
0.417
|
0.428
|
0.442
|
0.458
|
0.479
|
0.511
|
0.573
|
0.643
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2
|
0.406
|
0.385
|
0.365
|
0.341
|
0.328
|
0.311
|
0.293
|
0.271
|
0.236
|
0.177
|
0.122
|
|
|
0.598
|
0.616
|
0.636
|
0.660
|
0.673
|
0.689
|
0.706
|
0.729
|
0.761
|
0.818
|
0.873
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
3
|
0.542
|
0.518
|
0.494
|
0.465
|
0.449
|
0.428
|
0.405
|
0.377
|
0.332
|
0.254
|
0.177
|
|
|
0.745
|
0.762
|
0.781
|
0.802
|
0.813
|
0.826
|
0.841
|
0.859
|
0.883
|
0.922
|
0.955
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
4
|
0.647
|
0.622
|
0.597
|
0.565
|
0.548
|
0.525
|
0.500
|
0.468
|
0.416
|
0.323
|
0.229
|
|
|
0.838
|
0.852
|
0.868
|
0.884
|
0.893
|
0.903
|
0.914
|
0.926
|
0.943
|
0.967
|
0.984
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
5
|
0.728
|
0.704
|
0.678
|
0.647
|
0.629
|
0.606
|
0.579
|
0.546
|
0.490
|
0.386
|
0.278
|
|
|
0.898
|
0.908
|
0.920
|
0.933
|
0.939
|
0.946
|
0.953
|
0.962
|
0.972
|
0.986
|
0.994
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
6
|
0.790
|
0.768
|
0.744
|
0.713
|
0.696
|
0.673
|
0.646
|
0.612
|
0.554
|
0.443
|
0.323
|
|
|
0.935
|
0.943
|
0.952
|
0.961
|
0.965
|
0.970
|
0.975
|
0.980
|
0.986
|
0.994
|
0.998
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
7
|
0.838
|
0.818
|
0.796
|
0.767
|
0.751
|
0.729
|
0.702
|
0.669
|
0.610
|
0.495
|
0.366
|
|
|
0.959
|
0.965
|
0.971
|
0.977
|
0.980
|
0.983
|
0.986
|
0.990
|
0.993
|
0.997
|
0.999
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
8
|
0.875
|
0.857
|
0.837
|
0.811
|
0.796
|
0.775
|
0.750
|
0.717
|
0.660
|
0.542
|
0.406
|
|
|
0.974
|
0.978
|
0.983
|
0.987
|
0.989
|
0.991
|
0.993
|
0.995
|
0.997
|
0.999
|
+.+++
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
9
|
0.904
|
0.888
|
0.870
|
0.847
|
0.832
|
0.813
|
0.790
|
0.758
|
0.702
|
0.585
|
0.443
|
|
|
0.983
|
0.986
|
0.989
|
0.992
|
0.993
|
0.995
|
0.996
|
0.997
|
0.998
|
+.+++
|
+.+++
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10
|
0.926
|
0.912
|
0.897
|
0.875
|
0.863
|
0.845
|
0.823
|
0.794
|
0.740
|
0.623
|
0.478
|
|
|
0.990
|
0.992
|
0.994
|
0.995
|
0.996
|
0.997
|
0.998
|
0.999
|
0.999
|
+.+++
|
+.+++
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
11
|
0.943
|
0.931
|
0.918
|
0.899
|
0.887
|
0.871
|
0.851
|
0.824
|
0.773
|
0.658
|
0.511
|
|
|
0.993
|
0.995
|
0.996
|
0.997
|
0.998
|
0.998
|
0.999
|
0.999
|
+.+++
|
+.+++
|
+.+++
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
12
|
0.956
|
0.946
|
0.934
|
0.918
|
0.908
|
0.893
|
0.875
|
0.850
|
0.801
|
0.690
|
0.542
|
|
|
0.996
|
0.997
|
0.998
|
0.998
|
0.999
|
0.999
|
0.999
|
+.+++
|
+.+++
|
+.+++
|
+.+++
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
13
|
0.966
|
0.958
|
0.948
|
0.933
|
0.924
|
0.911
|
0.895
|
0.871
|
0.826
|
0.719
|
0.571
|
|
|
0.997
|
0.998
|
0.999
|
0.999
|
0.999
|
0.999
|
+.+++
|
+.+++
|
+.+++
|
+.+++
|
+.+++
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
14
|
0.974
|
0.967
|
0.958
|
0.946
|
0.938
|
0.926
|
0.911
|
0.890
|
0.848
|
0.745
|
0.598
|
|
|
0.998
|
0.999
|
0.999
|
0.999
|
+.+++
|
+.+++
|
+.+++
|
+.+++
|
+.+++
|
+.+++
|
+.+++
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
15
|
0.980
|
0.974
|
0.967
|
0.956
|
0.949
|
0.939
|
0.926
|
0.906
|
0.867
|
0.769
|
0.623
|
|
|
0.999
|
0.999
|
0.999
|
+.+++
|
+.+++
|
+.+++
|
+.+++
|
+.+++
|
+.+++
|
+.+++
|
+.+++
|
| |
|
+.+++ denotes a number greater than 0.999 and less than
1.000.
|
|