The best observation period of time最佳观测时段
3)relative perspective时段观
4)observation frequency band观测频段
5)section measurement路段观测
6)traffic observation location观测路段
1.After analysis of the necessity and feasibility of OD matrix estimation applied to highway engineering feasibility study,three key technical issues are pointed out which are determination of the seed OD matrix,selection of the traffic observation location and choice of the assignment method.在分析OD反推技术在公路工程可行性研究中应用的必要性、可行性之后,指出了OD反推技术应用中的三个关键技术问题,即观测路段的选取、种子OD的确定和分配方法的选择。
延伸阅读
观测①观察并测量（天文、地理、气象、方向等）：～风力。②观察并测度（情况）：～敌情。
