São Paulo Impermeable Density

Impermeable Density = (impermeable area) / (rsu area) Impermeable area calculated from permeable area provided by São Paulo Municipal Green and Environmental Secretariat (SVMA). RSU area = census tracts from IBGE (Brazilian Statistics Institute).不透水面积密度（Impermeable Density）=（不透水区域面积）/（RSU区域面积）。其中不透水区域面积由圣保罗市绿色与环境秘书处（São Paulo Municipal Green and Environmental Secretariat，SVMA）提供的透水区域面积计算得出；RSU区域面积取自巴西统计研究所（Brazilian Statistics Institute，IBGE）的人口普查区域数据。