Evidence supporting the rule of symmetry for OSM data sets.
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https://figshare.com/articles/dataset/Evidence_supporting_the_rule_of_symmetry_for_OSM_data_sets_/6811646
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†Proportion obtained by removing parallel pairs with one empty and one non-empty values. ‡Proportion obtained by treating pairs with one empty and one non-empty values as symmetrical examples.
创建时间：
2018-07-12
