Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Skip to content
  • Feedback

    • Valley Identification Tool - US EPA Regions 1, 2, 3, 9, 10 - 2024

    Metadata Updated: February 25, 2025

    The Valley Identification Tool web mapping application includes Valleys (locations that are lower than surrounding areas, derived from USGS 30m DEM), population in valleys (reallocated within Census block groups), and households heated primarily with wood (American Community Survey, most recent at time of processing), which are summarized by Census County Subdivision. Other layers included in the Valley Identification Tool web map include 2017 National Emissions Inventory (NEI) facilities, Tribal areas, and air monitors data.

    Created by US EPA Region 1 GIS Center; and implemented in EPA Regions 2, 3 and 9 in 2022 and Region 10 in 2024 by regional GIS staff, US EPA Office of Mission Support (OMS).

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date February 10, 2025
    Metadata Created Date February 25, 2025
    Metadata Updated Date February 25, 2025
    Reference Date(s) []
    Frequency Of Update asNeeded

    Metadata Source

    Harvested from Environmental Dataset Gateway ISO Geospatial Metadata

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Date February 10, 2025
    Metadata Created Date February 25, 2025
    Metadata Updated Date February 25, 2025
    Reference Date(s) []
    Responsible Party U.S. Environmental Protection Agency, Region 1 (Publisher)
    Contact Email
    Guid 2983366F-1FF3-46E1-9FD1-EF7E3847B0A0
    Access Constraints https://edg.epa.gov/EPA_Data_License.html
    Bbox East Long -63.943716
    Bbox North Lat 53.109107
    Bbox South Lat 24.527329
    Bbox West Long -131.625395
    Coupled Resource
    Frequency Of Update asNeeded
    Harvest Object Id 84b03fec-4a80-4875-af50-5e68ff885508
    Harvest Source Id 9b3cd81e-5515-4bb7-ad3c-5ae44de9b4bd
    Harvest Source Title Environmental Dataset Gateway ISO Geospatial Metadata
    Licence
    Lineage EPA Region 1 GIS Center applied ArcGIS' Focal Statistics tool to the USGS 30-meter NED DEM to find places where elevations are significantly less than average. We then quantified population and wood fuel usage within Census County Subdivisions to find locations which may be vulnerable to wood smoke pollution during winter thermal inversions.
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-131.625395, 24.527329], [-63.943716, 24.527329], [-63.943716, 53.109107], [-131.625395, 53.109107], [-131.625395, 24.527329]]]}
    Progress
    Spatial Data Service Type
    Spatial Reference System 0
    Spatial Harvester True

    Didn't find what you're looking for? Suggest a dataset here.