EnviroAtlas Spatial Extents

EnviroAtlas data are developed for two primary spatial extents: 

  • National - Data covering the nation. 
  • Community - Data covering select communities at a higher resolution.

Additional maps, such as demographics, boundaries, and land cover data, provide context for the national and community extents. 

Side by side comparison of national- and community-scale dataExample images showing EnviroAtlas spatial extents. National data (left) are aggregated to 12-digit HUCs, while community data (right) are aggregated to census block groups.

National Data

  • Most maps at the national extent provide wall-to-wall data coverage for the contiguous U.S. as well as some data for Alaska and Hawaii. There are approximately 300 data layers at this extent.
  • These data layers are summarized by 12-digit hydrologic unit codes (12-digit HUCs), or sub-watershed basins, and provide approximately 90,000 similarly sized spatial units. Many of these data layers are derived from data with a resolution of 30 m.
  • Ecosystem Markets data layers are also available for the nation, showing point and polygon data for ecosystem market initiatives and enabling conditions operating at a variety of scales, from national to local. 

Community Data

  • Community-level information in EnviroAtlas draws from fine scale land cover data, census data, and models.  There are approximately 100 data layers per community. 
  • EnviroAtlas community data are consistent for each available community, and they are mostly summarized by census block groups.
  • Each community area boundary is based on selected block groups within the 2010 US Census Urban Area boundary.
  • EnviroAtlas plans to incorporate 50 communities by 2019. See a list of the available and upcoming communities.

Supplemental Data

These data are available for both the nation and selected communities. 

  • They provide context and additional data for exploring ecosystem services and the built environment. 
  • These data are not summarized by a specific spatial unit. Instead, supplemental maps represent features in the landscape such as rivers and wetlands, other contextual landmarks such as state boundaries, and the 1 meter resolution land cover data for each community.

People and Built Spaces Data 

These data are available for both the nation and selected communities. 

  • Demographic data at the national extent are available for the contiguous U.S. and are summarized by census tract. 
  • Demographic data at the community extents are available for each EnviroAtlas community and are summarized by census block group. 
  • Approximately 40 data layers summarizing demographic, employment, and built environment variables are available for every census block group in the U.S.