timestamp,lon,lat,id
2014-01-01 01:00:10,1,1,1
2014-01-01 01:00:15,2,2,1
2014-01-01 01:00:20,3,3,1
2014-01-01 01:00:10,3,3,2
2014-01-01 01:00:15,2,2,2
2014-01-01 01:00:20,1,1,2
2014-01-01 01:00:10,1,3,3
2014-01-01 01:00:15,2,2,3
2014-01-01 01:00:20,3,1,3
2014-01-01 01:00:10,3,1,4
2014-01-01 01:00:15,2,2,4
2014-01-01 01:00:20,1,3,4
