Service Description: 2016 overall SVI, county level. Created by the Centers for Disease Control and Prevention (CDC) / Agency for Toxic Substances and Disease Registry (ATSDR) / Geospatial Research, Analysis, and Services Program (GRASP).
Service ItemId: 425652f366d34c8ca33e6b014a304054
Has Versioned Data: false
Max Record Count: 4000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: False
Supports Shared Templates: False
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Description: This feature layer visualizes the 2016 overall SVI for U.S. counties
Social Vulnerability Index (SVI) indicates the relative vulnerability of every U.S. county
15 social factors grouped into four major themes
Index value calculated for each county for the 15 social factors, four major themes, and the overall rank
What is CDC's Social Vulnerability Index?
ATSDR’s Geospatial Research, Analysis & Services Program (GRASP) has created a tool to help emergency response planners and public health officials identify and map the communities that will most likely need support before, during, and after a hazardous event.
The Social Vulnerability Index (SVI) uses U.S. Census data to determine the social vulnerability of every county. The SVI ranks each county on 15 social factors, including poverty, lack of vehicle access, and crowded housing, and groups them into four related themes:
- Socioeconomic
- Housing Composition and Disability
- Minority Status and Language
- Housing and Transportation
Variables
Rankings
We ranked counties for the entire United States against one another. This feature layer can be used for mapping and analysis of relative vulnerability of counties in multiple states, or across the U.S. as a whole. County rankings are based on percentiles. Percentile ranking values range from 0 to 1, with higher values indicating greater vulnerability. For each county, we generated its percentile rank among all counties for 1) the fifteen individual variables, 2) the four themes, and 3) Its overall position.
Overall Rankings:
We summed the sums for each theme, ordered the counties, and then calculated overall percentile rankings. Please note; taking the sum of the sums for each theme is the same as summing individual variable rankings.
The overall tract summary ranking variable is RPL_THEMES.
Theme rankings:
For each of the four themes, we summed the percentiles for the variables comprising each theme. We ordered the summed percentiles for each theme to determine theme-specific percentile rankings. The four summary theme ranking variables are:
- Socioeconomic theme - RPL_THEME1
- Housing Composition and Disability - RPL_THEME2
- Minority Status & Language - RPL_THEME3
- Housing & Transportation - RPL_THEME4
Flags
Counties in the top 10%, i.e., at the 90th percentile of values, are given a value of 1 to indicate high vulnerability. Counties below the 90th percentile are given a value of 0. For a theme, the flag value is the number of flags for variables comprising the theme. We calculated the overall flag value for each county as the number of all variable flags.
SVI Informational Videos
More Questions?
Centers for Disease Control and Prevention (CDC) / Agency for Toxic Substances and Disease Registry (ATSDR) / Geospatial Research, Analysis, and Services Program (GRASP)
Spatial Reference: 4269 (4269)
Initial Extent:
XMin: -179.340343030896
YMin: 30.8262758727682
XMax: -64.4123764492938
YMax: 78.0530380558972
Spatial Reference: 4269 (4269)
Full Extent:
XMin: -179.148909
YMin: 18.910361
XMax: 179.77847
YMax: 71.365162
Spatial Reference: 4269 (4269)
Units: esriDecimalDegrees
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