Because each model in VRML is created in local coordinate system, inconvenient to handle them uniformly, this paper infers a universal formula to transform model coordinates from UCS to WCS.
针对各VRML造型在其局部坐标系中创建，采用变换矩阵实现了造型从局部坐标系下到世界坐标系下的坐标变换。
From GPS surveying the WGS-84 coordinates are acquired, while in reality coordinates in local coordinate system are needed, so conversion from WGS-84 coordinates to local coordinates is necessary.
GPS测量得到的是WGS - 84坐标，而实用上需要的是地方坐标系坐标，因而得把WGS - 84坐标转换地方坐标系坐标。
There were two main part of error source, the local reference system which was about 0.15as and the measurement coordinates of objects which were about 0.45as.
详细分析了主要的误差来源，分别是由参考星决定的局部参考架的误差约0.15角秒，目标量度坐标误差约为0.45角秒。
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