Convert a STTDF object into a SpatialLines object

Description

Convert a STTDF object into a SpatialLines object

Usage

1

Arguments

sttdf

a STTDF object

Value

sl return a single SpatialLines object that contains all trajectories from the STTDF object. Only the coordinates are kept. All temporal and data attributes are discarded.

Author(s)

Jinlong Yang: jinlong@psu.edu