740 / 881
1
o
μ
2
o
3
o
2 2
2
2
1
2 1 3 1 3 2
2 2
2
2
2 3 2 2 1 3 1
2 2
2
2
3 3 1 3 2 2 1
(
)/2
(
)/2
(
)/2
− −
−
− −
−
− −
−
= + −
= + −
= + −
σ σ σ σ
σ σ σ σ
σ σ σ σ
Analysis of variance
Observer places O
1,
Observer places O
2
Computer places O
3
Measure distances for many scans and landmarks
Compute standard deviations of differences
Solve for standard deviation of individual observers