Table 3 |
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The environmental variables selected for this study. Study unit: census block groups. |
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| Variable |
Description |
Mean for all 658 census blockgroups in Indianapolis, Indiana, USA. |
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| Land use land cover (LULC) |
Area percentage of each LULC category |
Varied by seasons and years |
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|
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| Impervious surface |
Average percentage of impervious surface |
38.8% |
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|
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| Elevation |
Elevation variation |
12.9 m (42.3 ft) |
|
|
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| Slope |
Mean slope |
1.6° |
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|
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| Stream |
Total stream length and stream density |
466.7 m (1531.2 ft) |
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|
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| Wetland |
Total size of wetlands |
51437.4 m2 (553 667.6 sq.ft) |
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|
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| Pollutant |
Distance from centroid of each census blockgroup to the closest pollutant in National Pollutant Discharge Elimination System (NPDES) |
3,201.8 m (10 504.6 ft) |
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|
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| Pipe |
Distance from centroid of each census blockgroup to the closest pipe in NPDES |
7,831.3 m (25,693.2 ft) |
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|
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| Waste industry |
Distance from centroid of each census blockgroup to the closest waste industry site |
804.9 m (2,640.7 ft) |
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| Population density |
Human population density |
1,587 per sq. km |
Liu et al. International Journal of Health Geographics 2008 7:66 doi:10.1186/1476-072X-7-66 |
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