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

<div>The distribution of the data for the indicators <i>D</i><sub>13</sub>, <i>D</i><sub>14</sub>, and <i>D</i><sub>15.</sub></div>

Mathematical Problems in Engineering

Figure 5: Spatial Pattern of Underground Space Development in Major Cities in China: Evaluation and Analysis 