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。
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.
在分析了线性参照系统概念模型的基础上，对其中两个关键问题进行了研究，即基于道路几何特征的线性参照基准模型和基于道路曲线要素的动态分段模型。
In this paper, a linear referencing system based on road line-shape is presented in order to reduce spatial data redundancy and protect road event from going out of road range.
等产量线是表示两种生产要素的不同数量组合可以带来相等产量的一条曲线。
Isoquant curve is a line showing all the alternative combinations of two factors that can produce a given level of output.
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