Time in movement data depends on if its a track (sftrack) or trajectory (sftraj). A track has a single timestamp for each data point where as a trajectory has a start and end point for each step. The sft_timestamp class is a column level class containing a list or vector for each point.
sft_time(x = list())
| x | a list or vector containing time objects, either POSIXct or integer. If an sftraj must be a time interval where [[1]] ==start and [[2]] == end time for step. |
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