An Approach to Generate Spatial Voronoi Treemaps for Points, Lines, and Polygons

Table 1

Urban hierarchy by population in China.

Category	Population size	The number of cities	Level
Mega	≥10,000,000	13	1
Macro	5,000,000–10,000,000	76	2
Large/Middle/Micro	0–5,000,000	253	3