Research Article

Spatial Pattern of Underground Space Development in Major Cities in China: Evaluation and Analysis

Table 3

Corresponding standards for the closeness of UUS development level.

RankRange of DLevel of developmentNumber of citiesPercentage of cities

Level 1>0.8Excellent00
Level 20.6∼0.8Good615.39
Level 30.3∼0.6General1538.46
Level 40∼0.3Poor1846.15