二塘沟水库施工控制网平面坐标系的建立和观测

通过对二塘沟水库库区地理位置的分析，得出该地区每公里变形值较大，为满足施工放样精度及业主建设水库的进场公路和下一级水库规划使用的要求，根据二塘沟现有的测绘资料，建立了二塘沟水库施工控制网平面坐标系。采用三等GPS网进行观测，通过统计测量精度，得出该测量精度高等优点。

Plane Coordinate System of GPS Control Network Extablished and Observational in Jiamusi

Through analyzing the geographic location of Ertanggou reservoir area, con- cluded that per kilometer deformation value is bigger for this area, in order to meet the con- struction lofting precision and owner reservoir in highway construction and lower level re- quirements for reservoir planning and Ertanggou existing surveying and mapping data, Er- tanggou reservoir construction plane control network coordinate system is set up. Third- class GPS network is observation , and high measurement precision is presented.