Dataset Identification:
Resource Abstract:
- 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Since 2015, the seamless 1/9 arc-second DEM layer is no longer being updated.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 domain.; abstract: 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 domain.
Citation
- Title 1/9th Arc-second Digital Elevation Models (DEMs) - USGS National Map 3DEP Downloadable Data Collection.
-
- creation Date
2018-07-26T19:00:11.899808
Resource language:
Processing environment:
Back to top:
Metadata data stamp:
2018-08-06T19:35:10Z
Resource Maintenance Information
- maintenance or update frequency:
- notes: This metadata record was generated by an xslt transformation from a dc metadata record; Transform by Stephen M. Richard, based
on a transform by Damian Ulbricht. Run on 2018-08-06T19:35:10Z
Metadata contact
-
pointOfContact
- organisation Name
CINERGI Metadata catalog
-
- Contact information
-
-
- Address
-
- electronic Mail Address cinergi@sdsc.edu
Metadata language
eng
Metadata character set encoding:
utf8
Metadata standard for this record:
ISO 19139 Geographic Information - Metadata - Implementation Specification
standard version:
2007
Metadata record identifier:
urn:dciso:metadataabout:14fa2d80-b6e6-4cda-a7f3-95d740b716e1
Metadata record format is ISO19139 XML (MD_Metadata)