公路地理信息系统中坐标与里程的转换

ＧＰＳ测量，地图的手工数字化以及扫描是目前ＧＩＳ－Ｔ采集和更新空间的数据的主要手段。在按照上述方法采集数据时，道路几何线型通常以离散的坐标串的形式予以表达，交通运输部门在日常工作中所管理的各种属性数据通常里程建立与其空间位置之间的联系。在应用ＧＩＳ概念和技术解决交通运输问题时需要构造高精度的线性参照系，因此需要研究三维或二维坐标与与一维里程之间的转换模型，以实现坐标与里程之间的一一对应，达到快速信

Transformation between Coordinates and Mileage in Highway Geographic Information System

Due to the reason that the observations of GPS and map digihzation are 3D or 2D cooldinates and that thehighway attributes are related to their spatial peihons by mileage, the transfonnation medels betWeen cooldinates andtheleage are needed to develop. The authors presented a methedology for the highway alignment recognition which canbe used as the basis to establish high accuracy on. Relevant algorithm are demonstrated for ac medeling whenphase GPS and map digitization ~ adopted. At the end of the poper, two real - life examples are illustrated by usingthe above aleorithln and foe feaSibility of this method is also proved.