This layer displays information regarding the locations and characteristics of SNAP authorized retailers across the US. Data has been updated to reflect stores accepting SNAP as of May 20, 2014.
Access to Farmer’s Markets
This layer displays the percentage of each county’s population (or low income population) living near a farmer’s market (defined as within a 3 mile radius in urban areas and a 10 mile radius in urban areas).
School Attendance Zones
This layer displays public school catchment boundaries (attendance zones) for select states and school districts across the United States. Data is from September 2013 and was acquired from the National Center for Educational Statistics (NCES).
SNAP Recipients by County, 2013
This layer displays the percentage of population receiving SNAP benefits by county. Data are from the US Census Bureau 2014 Small Area Income and Poverty Estimates (SAIPE) dataset, released December 2015.
National Hydrography Dataset (Area)
The National Hydrography Dataset (NHD) is used to portray surface water. The NHD represents the drainage network with features such as rivers, streams, canals, lakes, ponds, coastline, etc. The principal components of the NHD are:
- NHDFlowline: This is the fundamental flow network consisting predominantly of stream/river and artificial path vector features. It represents the spatial geometry, carries the attributes, models the water flow, and contains linear referencing measures for locating events on the network. Additional NHDFlowline features are canal/ditch, pipeline, connector, underground conduit, and coastline.
- NHDArea: This feature class contains many additional features of water polygons. One of the more important is the stream/river feature. It represents the aerial extent of the water in a wide stream/river with a basic set of attributes. They typically contain NHDFlowline artificial paths that are used to model the stream/river. Artificial path carries the critical attributes of the stream/river, whereas NHDArea represents the geometric extent.
- NHDWaterbody: Basic waterbodies such as lake/pond features are represented here. They portray the spatial geometry and the attributes of the feature. These water polygons may contain NHDFlowline artificial paths to allow the representation of water flow. Other NHDWaterbody features are swamp/marsh, reservoir, playa, estuary, and ice mass.
Air Quality – Fine Particulate Matter (PM2.5) by Census Tract, 2012
This layer displays the percentage of days with concentrations of ozone matter above the National Ambient Air Quality Standard (NAAQS) of 35.0 micrograms per cubic meter.
Income from Transfer Payments
This layer displays information about personal income from transfer payments from the Bureau of Economic Analysis (BEA) Local Area Personal Income data series.
Opportunity Data – Labor Market Index
The labor-market engagement index provides a summary description of the relative intensity of labor market engagement and human capital in a neighborhood. This is based upon the level of employment, labor force participation, and educational attainment in a census tract.
Income from Retirement/Disability Payments
This layer displays information about personal income from retirement and disability transfer payments from the Bureau of Economic Analysis (BEA) Local Area Personal Income data series.
Opportunity Data – School Proficiency Index
The school proficiency index uses school-level data on the performance of 4th grade students on state exams to describe which neighborhoods have high-performing elementary schools nearby and which are near lower performing elementary schools.