Service Description:
Service ItemId: 74fee356142b43c39d1c75c4d409ab0c
Has Versioned Data: false
Max Record Count: 2000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: False
Supports Shared Templates: True
All Layers and Tables
Layers:
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?
Copyright Text: 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: -14216983.9055406
YMin: 5259646.37514804
XMax: -12565094.8191966
YMax: 5790053.57391117
Spatial Reference: 102100 (3857)
Full Extent:
XMin: -13866652.5144055
YMin: 5159751.06386673
XMax: -12964659.3856638
YMax: 5827273.1682433
Spatial Reference: 102100 (3857)
Units: esriMeters
Child Resources:
Info
SharedTemplates
Supported Operations:
Query
ConvertFormat
Get Estimates