gps轨迹优化，gps采样的点显示轨迹的时候，由于gps漂移和定位精度的原因，地图上显示的轨迹不太理想，通过卡尔曼算法，是轨迹达到平滑的效果-gps trajectory optimization, gps sampling point display trajectory, because of drift and gps positioning accuracy reasons, the track displayed on the map is not ideal, through Kal