The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.
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免抵退税办法，是指出口环节免征增值税，对应的进项税额抵减应纳增值税税额，未抵减完的部分予以退还；免退税办法，是指出口环节免征增值税，对应的进项税额予以退还。，推荐阅读safew官方下载获取更多信息