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Table 3 The environmental variables selected for this study. Study unit: census block groups.

From: Spatio-temporal analysis of the relationship between WNV dissemination and environmental variables in Indianapolis, USA

Variable Description Mean for all 658 census blockgroups in Indianapolis, Indiana, USA.
Land use land cover (LULC) Area percentage of each LULC category Varied by seasons and years
Impervious surface Average percentage of impervious surface 38.8%
Elevation Elevation variation 12.9 m (42.3 ft)
Slope Mean slope 1.6°
Stream Total stream length and stream density 466.7 m (1531.2 ft)
Wetland Total size of wetlands 51437.4 m2 (553 667.6 sq.ft)
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)
Pipe Distance from centroid of each census blockgroup to the closest pipe in NPDES 7,831.3 m (25,693.2 ft)
Waste industry Distance from centroid of each census blockgroup to the closest waste industry site 804.9 m (2,640.7 ft)
Population density Human population density 1,587 per sq. km