Under the base of studying the typical location plans of prismatic parts, process model and fuzzy comprehensive evaluation model of location datum selection are established.
在分析箱体类零件典型定位方案的基础上，建立了定位基准选择的过程模型和综合评判模型。
The method to synchronize two stations' measurements datum was given. Then with the synchronous datum, the way to get the location of the maneuvering target was given.
给出了一种同步两站数据时间的方法，然后用同步后的数据对机动目标进行定位。
Should regard initial data in the charts of route location and curve elements as datum that coordinates calculate will just get the datum of high accuracy, Guide constructing accurately.
应以路线固定表和曲线要素表中的原始数据为基准推算坐标才会得到更高精度的数据，精确指导施工。
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