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L Halpin

FLightR outlier detection


Hi Folks,



Can anyone describe how outlier detection works in FLightR?  How does it determine which points are outliers and what are the criteria for outlier detection?


check.outliers=TRUE is part of the run.particle.filter function.





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  Hi Luke,

 I do not think it is well documented, so I will try to explain it here.

Imagine we are at time point (twilight) A, particle filter simulates new positions for point B and from those for point C. After it checks 

1. If AB average movement was more than 50 km


2. AB average distance was > AC.distance*1.3


3. AB.distance>AC.distance AND angle ABC<100 degrees


If this condition is satisfied it exclude point B.

   I know it is not very smart filtering, so I am not a big fan of it. I will be happy if someone programmes something better, e.g. Douglas filter

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