Calculates the segment length of a track
## S4 method for signature 'SpatialPointsDataFrame' seglength(x)
a SpatialPointsDataFrame, like a Move or MoveStack object
The seglength function calculates the distances between point 1 and point 2, point 2 and point 3, ... .
If the SpatialPointsDataFrame is projected in longitude latitude coordinates, the returned values are in meters. If not, the distances are Euclidean distances in map units. Distances are calculates with the
pointDistance from the package raster. Note that in stacks distances are not split between animals.
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