韩城市经济技术开发区1∶2000地形图测绘投影坐标系的选择

The selection of projection coordinate system of 1∶2 000 topographic map in Hancheng economic and technological development zone

为了满足韩城市经开区1∶2000地形图测绘及工程放样的精度要求,确定采用哪一种坐标系统能满足《工程测量规范》的规定,经分析论证,选择投影面为250 m的抵偿高程面建立平面直角坐标系统,达到投影长度变形不大于2.5 cm/km的规定。

In order to meet the accuracy requirements of mapping and project lofting of 1： 2000 topographic map in Hancheng economic and technological development zone,it is necessary to determine which coordinate system can meet the requirements of ＂Engineering Survey Specification＂. Through analysis and demonstration,the plane rectangular coordinate system is established by selecting the compensation height surface with projection surface of 250 m,so that the projection length deformation is not greater than 2. 5 cm/km.