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Table 1 GIS variables used in model-building

From: Nitrogen dioxide concentrations in neighborhoods adjacent to a commercial airport: a land use regression modeling study

Variable category/type Variable(s) (units) Units
Distance to nearest road class Distance to nearest Class 1 Roadway (RI DOT) m
  Distance to nearest Class 2 Roadway (RI DOT) m
  Distance to nearest Class 3 Roadway (RI DOT) m
  Distance to nearest Class 4 Roadway (RI DOT) m
Traffic density Traffic density within various radii (100, 200, 300, 400 m) vehicles/day/km2
Distance to airport proxies Distance to airport terminal m
  Distance to Runway 16/34 m
  Distance to Runway 5/23 m
  Distance to airport centroid m
  Distance to airport fence line m
Total length of proximate roadways Total length of Class 1 roadways (within 100-400 m) m
  Total length of Class 2 roadways (within 100-400 m) m
  Total length of Class 3 roadways (within 100-400 m) m
  Total length of Class 4 roadways (within 100-400 m) m
  Total length of all roadways (within 100-400 m) m
Total length of proximate roadways, weighted by wind rose (fraction of time by direction, 8 segments) Total length of Class 1 roadways, weighted (within 200 m) m
  Total length of Class 2 roadways, weighted (within 200 m) m
  Total length of Class 3 roadways, weighted (within 200 m) m
  Total length of Class 4 roadways, weighted (within 200 m) m
Traffic-weighted road length ADT-weighted road length (within 100-400 m) vehicle-meters/day