Spatial Access of America: Multiple indicators of accessibility to opportunities

This is dataset of spatial accessibility to opportunities measured by combinations of multiple metrics, travel modes, types of opportunity (such as jobs and social support amenities), and travel time thresholds. This includes both cumulative opportunities types of measures as well as floating catchment area (FCA)-based competition metrics. A total of 600 accessibility values are computed for each zone at three administrative levels – county, census tract, and census block group – for the 50 most populous urban areas of the United States. Additionally, the dataset also includes the travel time matrix files for each of these urban areas by three travel modes – driving, walking, and bicycling – to facilitate self-validation.