Second is refinement step, in which spatial objects resulted from filter step are subjected to exacted computation.
第二步为细化步骤，对从第一步中筛选出的空间对象进行精确的空间运算操作。
Second is refinement step, in which spatial objects resulted from filter step are subjected to exacted computation.
第二步为细化步骤，对从第一步中筛选出的空间对象进行精确的空间运算操作。
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