Service Description: 2016 overall SVI, census tract 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: 62b3e305b730423782c64b9696242c5e
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. census tracts
Social Vulnerability Index (SVI) indicates the relative vulnerability of every U.S. census tract
15 social factors grouped into four major themes
Index value calculated for each census tract 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 census tract. The SVI ranks each census tract 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 census tracts for the entire United States against one another. This feature layer can be used for mapping and analysis of relative vulnerability of census tracts in multiple states, or across the U.S. as a whole. Census tract rankings are based on percentiles. Percentile ranking values range from 0 to 1, with higher values indicating greater vulnerability. For each census tract, we generated its percentile rank among all census tracts 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 census tracts, 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
Census tracts in the top 10%, i.e., at the 90th percentile of values, are given a value of 1 to indicate high vulnerability. Census tracts 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 census tract 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: -156.231884057971
YMin: 34.1614906832298
XMax: -66.0455486542443
YMax: 71.2213007622286
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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