该方法对数据进行分块组织，按行列顺序对数据块编号，实现对地形数据的部分读取。
It organizes data block partition, indexes data blocking based on the order of row and line, implements the local loading of terrain data.
数据块优先排序器有一个规范列表，但也提供了一个编号来指示满足规范标准的每个数据块的优先级。
The chunk prioritizer has a list of specs, as the selector, but also contains a number to indicate priority of each chunk that meet the criteria of the spec.
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