1/9th Arc-second Digital Elevation Models (DEMs) - USGS National Map 3DEP Downloadable Data Collection
type: Dataset
description: This is a tiled collection of the 3D Elevation Program (3DEP) and is 1/9 arc-second (approximately 3 m) resolution.The 3DEP data holdings serve as the elevation layer of The National Map, and provide foundational elevation information for earth science studies and mapping applications in the United States. Scientists and resource managers use 3DEP data for hydrologic modeling, resource monitoring, mapping and visualization, and many other applications. The elevations in this DEM represent the topographic bare-earth surface. The seamless 1/9 arc-second DEM layers are derived from diverse source data that are processed to a common coordinate system and unit of vertical measure. These data are distributed in geographic coordinates in units of decimal degrees, and in conformance with the North American Datum of 1983 (NAD 83). All elevation values are in meters and, over the continental United States, are referenced to the North American Vertical Datum of 1988 (NAVD88). The seamless 1/9 arc-second DEM layer project-based coverage for portions of the conterminous United States, limited areas of Alaska, and Guam. The seamless 1/9 arc-second NED layer is available as pre-staged products tiled in 15 minute blocks in Erdas .img format. Since 2015, the seamless 1/9 arc-second DEM layer is no longer being updated. Other 3DEP products are nationally seamless DEMs in resolutions of 1/3, 1, and 2 arc seconds. These seamless DEMs were referred to as the National Elevation Dataset (NED) from about 2000 through 2015 at which time they became the seamless DEM layers under the 3DEP program and the NED name and system were retired. Other 3DEP products include one-meter DEMs produced exclusively from high resolution light detection and ranging (lidar) source data and five-meter DEMs in Alaska as well as various source datasets including the lidar point cloud and interferometric synthetic aperture radar (Ifsar) digital surface models and intensity images. All 3DEP products are public doma…
keyword: 1-9-arc-second-dem
keyword: 15-minute-dem
keyword: 3dep
keyword: amerigeo
keyword: amerigeoss
keyword: bare-earth
keyword: cartography
keyword: ckan
keyword: dem
keyword: digital-elevation-model
keyword: digital-mapping
keyword: digital-terrain-model
keyword: elevation
keyword: elevation-theme
keyword: geo
keyword: geodata
keyword: geoss
keyword: gis
keyword: grid
keyword: high-resolution
keyword: hydro-flattened
keyword: ifsar
keyword: interferometric-synthetic-aperture-radar
keyword: lidar
keyword: light-detection-and-ranging
keyword: mapping
keyword: national
keyword: national-elevation-dataset
keyword: national-geospatial-data-asset
keyword: ned
keyword: ngda
keyword: north-america
keyword: raster
keyword: terrain-elevation
keyword: topographic-surface
keyword: topography
keyword: u-s-geological-survey
keyword: united-states
keyword: us
keyword: usgs
issued: 2025-11-20T13:03:40.029693
modified: 20201113
theme: {geospatial}
contact point: Organization
  fn: U.S. Geological Survey
spatial: Location

US Migrating
type: Agent

Original Metadata
type: Distribution
description: The metadata original format
media type: text/xml
format: XML
access URL: https://data.usgs.gov/datacatalog/metadata/USGS.40e52270-5c4b-497d-987f-827e374becff.xml
issued: 2022-08-07T10:00:13.178793
modified: 2025-11-20T13:03:40.009582