Social Vulnerability

The map below is based on the population data collected from the 2020 American Community Survey (ACS) 5-year product at the block group level.[1] This population data was geo-processed with the ESRI ArcGIS Pro Create Random Points tool to randomly distribute the population (Low- Moderate Universe). Similar to critical infrastructure, this population data was geo-processed with the ESRI ArcGIS Pro-Summarize Within tool, to generate a count of points within each 0.25-square-mile hex grid. The population per hex grid was classified on a quasi-exponential classification scale, showing areas with higher populations across the R2C AOI (see map below).

To spatially apportion population data to the hexagonal grids required that the count of population for each block group be randomly distributed across the applicable block group geographic area of each block group. Like other vulnerability indicators, population data was summed to generate a count of points within each .25-mile hex grid. Population per hex grid was classified on a quasi-exponential classification scale showing areas with higher populations across the AOI (Figure 3).  Here we see pockets of higher population in each county including: Cocoa and Cocoa Beach, Melbourne and Melbourne Beach, and Cape Canaveral in Brevard County; the Clermont and Mount Dora areas of Lake County; Ocala in Marion County; Orlando and its suburbs in Orange County; Celebration and Kissimmee in Osceola County; Altamonte Springs, Casselberry, Lake Mary, Longwood, and Oviedo in Seminole County, The Villages in Sumter County; and Daytona, Deland, Deltona, and beach cities/towns in Volusia County.  Although all populated (large or small) can be adversely affected by disasters we often see the worst outcomes in places where high populations intersect high hazard areas.  Orange and Seminole Counties have the most people in the high population category with 23.8% and 23.4% of their hex grid area (respectively) classified as high population.

The concept of social vulnerability is theoretically framed by a multi-disciplinary litany of case studies and research on specific hazard events, their impacts, and outcomes. Social vulnerability to hazards refers specifically to a lack of ability for individuals and communities to adequately prepare for, respond to, and rebound from environmental hazards. The science of vulnerability is relatively recent, but theoretical links between pre-event socio-economics and general adverse outcomes date back decades. One of the first operational measures of social vulnerability, Maloney’s (1973) Social Vulnerability of Indianapolis linked underlying social characteristics with adverse health outcomes. Subsequently, scholars at the University of South Carolina and the University of Central Florida have driven development of vulnerability science, empirical measurement of social vulnerability, and use of social vulnerability metrics for decision making, planning, and all phases of emergency management practice.