Only colour and width (aesthetics) are recommended when visualizing SpatialLines* objects.
TimeSpan.begin and TimeSpan.end are optional TimeStamp vectors in the format:
yyyy-mm-ddThh:mm:sszzzzzz
Use the same time values for both TimeSpan.begin and TimeSpan.end if the measurements refer to a single moment in time. TimeSpan.begin and TimeSpan.end can be either a single value or a vector of values.