Service Description:
Service ItemId: 76576c91832b44289a3385129ee749a4
Has Versioned Data: false
Max Record Count: 2000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: False
Supports Shared Templates: True
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Description: Overview
- This feature layer visualizes the 2020 overall SVI for U.S. counties and tracts
Social Vulnerability Index (SVI) indicates the relative vulnerability of every U.S. county and tract
16 social factors grouped into four major themes
Index value calculated for each county for the 16 social factors, four major themes, and the overall rank
What is CDC/ATSDR Social Vulnerability Index?
ATSDR’s Geospatial Research, Analysis & Services Program (GRASP) has created the Social Vulnerability Index (SVI) 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.
SVI uses U.S. Census data to determine the social vulnerability of every county and tract. CDC SVI ranks each county and tract on 16 social factors, including poverty, lack of vehicle access, and crowded housing, and groups them into four related themes: - Socioeconomic Status
- Household Characteristics
- Racial & Ethnic Minority Status
- Housing Type & Transportation
Variables
Rankings
We ranked counties and tracts 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. Rankings are based on percentiles. Percentile ranking values range from 0 to 1, with higher values indicating greater vulnerability. For each county and tract, we generated its percentile rank among all counties and tracts for 1) the sixteen individual variables, 2) the four themes, and 3) its overall position.
Overall Rankings:
We totaled 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 Status - RPL_THEME1
- Household Characteristics - RPL_THEME2
- Racial & Ethnic Minority Status - RPL_THEME3
- Housing Type & Transportation - RPL_THEME4
Flags
Counties and tracts in the top 10%, i.e., at the 90th percentile of values, are given a value of 1 to indicate high vulnerability. Counties and 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 county as the total number of all variable flags.
SVI Informational Videos
More Questions?
Centers for Disease Control and Prevention/ Agency for Toxic Substances and Disease Registry/ Geospatial Research, Analysis, and Services Program;
US Census Bureau, 2016-2020 American Community Survey
Spatial Reference: 102100 (3857)
Initial Extent:
XMin: -14449825.6859524
YMin: 4693804.08342015
XMax: -8641688.93513229
YMax: 6118041.80992027
Spatial Reference: 102100 (3857)
Full Extent:
XMin: -19942767.0256
YMin: 2164614.6238
XMax: 20012846.0377
YMax: 11528300.4769
Spatial Reference: 102100 (3857)
Units: esriMeters
Child Resources:
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Supported Operations:
Query
ConvertFormat
Get Estimates