北京城镇航测1∶500成图若干问题探讨

Discussion of 1∶500 Topographic Maps by the Aerophotogrammetry

北京东部地区地面沉降每年约5,在观测条件不良时网络RTK高程测量数据会出现粗差。地面沉降降低了高程起算点的精度,网络RTK高程粗差影响地形图高程注记点的高程精度。空域控制限制了1∶500地形图摄影的飞行高度,影响摄影比例尺的选择。城镇现代建筑的三维趋势,引起航测内业采集的线不是建筑物与地面的交线,造成地形图平面精度的降低。结合实例,叙述了应用数字航空摄影测量测绘1∶500地形图的作业流程。探讨了减少地面沉降对高程起算点和地形图的影响的方法,以及加大野外精确测量保证成图质量的措施。

Beijing eastern part of land subsides about 5cm per year.In the poor observing condition Network RTK elevation measurement will appear error.The above factors affect the accuracy of topographic maps for the height.Combined with an example,this paper describes the operation process of aerial photography surveying 1∶500topographic map,the method and measures to improve the accuracy of the topographic map.