属性函数
- ST_startTime
- ST_endTime
- ST_trajectorySpatial
- ST_trajectoryTemporal
- ST_trajAttrs
- ST_attrIntMax
- ST_attrIntMin
- ST_attrIntAverage
- ST_attrFloatMax
- ST_attrFloatMin
- ST_attrFloatAverage
- ST_leafType
- ST_leafCount
- ST_duration
- ST_timeAtPoint
- ST_pointAtTime
- ST_velocityAtTime
- ST_accelerationAtTime
- ST_timeToDistance
- ST_timeAtDistance
- ST_cumulativeDistanceAtTime
- ST_timeAtCumulativeDistance
- ST_subTrajectory
- ST_subTrajectorySpatial
- ST_samplingInterval
- ST_trajAttrsAsText
- ST_trajAttrsAsInteger
- ST_trajAttrsAsDouble
- ST_trajAttrsAsBool
- ST_trajAttrsAsTimestamp
- ST_attrIntFilter
- ST_attrFloatFilter
- ST_attrTimestampFilter
- ST_attrNullFilter
- ST_attrNotNullFilter
- ST_trajAttrsMeanMax