Dataset Identification:
Resource Abstract:
- description: This is a tiled collection of the 3D Elevation Program (3DEP) and is 2 arc-second (approximately 60 m) resolution
covering Alaska. The elevations in this Digital Elevation Model (DEM) represent the topographic bare-earth surface. 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 seamless 2 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 2 arc-second DEM layer provides coverage of the Alaska only. The seamless 2 arc-second
DEM is available as pre-staged products tiled in 1 degree blocks in Erdas .img, ESRI arc-grid, and grid float formats. The
seamless 2 arc-second DEM layer is updated continually as new data become available over Alaska. Other 3DEP products are nationally
seamless DEMs in resolutions of “ and 1 -arc-second. 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 2 arc-second (approximately
60 m) resolution covering Alaska. The elevations in this Digital Elevation Model (DEM) represent the topographic bare-earth
surface. 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 seamless 2 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 2 arc-second DEM layer provides coverage of the Alaska only.
The seamless 2 arc-second DEM is available as pre-staged products tiled in 1 degree blocks in Erdas .img, ESRI arc-grid, and
grid float formats. The seamless 2 arc-second DEM layer is updated continually as new data become available over Alaska. Other
3DEP products are nationally seamless DEMs in resolutions of “ and 1 -arc-second. 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 Alaska 2 Arc-second Digital Elevation Models (DEMs) - USGS National Map 3DEP Downloadable Data Collection.
-
- creation Date
2018-07-26T18:46:29.782775
Resource language:
Processing environment:
Back to top:
Metadata data stamp:
2018-08-06T19:42:14Z
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 2018-08-06T19:42:14Z
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:ff73f68e-0ee5-48d5-8ec4-d5be0d7f076c
Metadata record format is ISO19139 XML (MD_Metadata)