An official website of the United States government.

We've made some changes to If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.


EnviroAtlas Tools

The Interactive Map and Eco-Health Relationship Browser are the flagship EnviroAtlas applications. In addition to these, EnviroAtlas provides several downloadable toolboxes and other tools designed for use within the EnviroAtlas interactive mapping application. 

Interactive Map

The Interactive Map is a multi-scaled online GIS portal with broad scale data for the lower 48 states and fine scale data for selected communities. The mapping application includes built-in analysis tools. 

Tools in the Map

  • Raindrop - Select a location and see the general raindrop flow path and distance to the nearest water feature as depicted in National Hydrography Dataset Plus V2. 
  • HUC Navigation -  Identify upstream or downstream 12-digit HUCs within the stream network from any given point  in the conterminous US. 
  • Elevation Profile - View the elevation profile of a selected line segment.
  • Time Series Viewer - View historic and future environmental variables from 1950 - 2099 in a time-enabled animated map.
  • Change Analysis Tool - Compare a selected variable (e.g., evapotranspiration) between selected time periods.  

Eco-Health Relationship Browser

The Eco-Health Relationship Browser illustrates scientific evidence for linkages between ecosystem services and human health.

Geospatial Toolboxes

EnviroAtlas includes geospatial tools to help with calculating some of the data layers that are available in the interactive map. Access and download these geospatial tools and scripts to conduct analyses at different spatial scales with user-supplied data. Please note, these tools may require specific versions of commercial GIS software.

  • The downloadable Dasymetric Toolbox allows users to more accurately distribute population data that has been assigned to arbitrary boundaries, such as census blocks. A national map for the dasymetric allocation of population is also available in the Interactive Map. 
  • The Analytical Tools Interface for Landscape Assessments (ATtILA) is an ESRI ArcGIS toolbox that allows users to calculate many commonly used landscape metrics.
  • The Ecosystem Rarity Toolbox is a downloadable resource that allows users to calculate multiple measures of relative ecosystem rarity for their specific areas of interest. The Interactive Map also includes several data layers that show relative ecosystem rarity at the national-scale. 
  • The Automated Geospatial Watershed Assessment (AGWA)EXIT tool helps identify and prioritize potential problem areas at the watershed and subwatershed levels.

Additional decision-support tools and models can be found on the Related Resources and Links page.