Additionally, The network RTK is mainly used to acquire planecoordinates, and can't provide elevation service in time.
另一方面网络rtk还主要是平面运用，不能实时提供高程服务。
2
Various models for planecoordinates conversion are deduced starting from their geometrical significance in large number of literatures.
大量文献从几何意义上出发，推导了各种平面坐标的转换模型。
3
This paper discussed the feasibility of several transformation methods of planecoordinates, and introduced the design thought of coordinate transformation software.