Unlike straightforward extract and load operations, transformation is the most complicated piece, as there is a need to understand, convert, aggregate, and calculate data.
与直接的提取和加载操作不同，转换是最复杂的部分。因为在此过程中需要对数据进行理解、转换、聚集和计算。
Furthermore, a method of how to calculate vector of the iso-surface that has been extract from volume data is presented in this paper.
另外，本文提出了由等值面数据计算法向量的方法，实现了在只有等值面坐标数据的情况下计算法向量。
The effects of main errors of the system on the measurement results were analyzed, and some experiments were performed to extract and calculate the main errors of this system.
分析了系统的主要误差对测量结果的影响，完成了主要误差的提取实验。
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