USGS NED 1 arc-second n68w148 1 x 1 degree GridFloat 2017

Metadata Updated: January 11, 2018

This tile of the 3D Elevation Program (3DEP) seamless products is 1 arc-second resolution. 3DEP data serve as the elevation layer of The National Map, and provide basic elevation information for Earth science studies and mapping applications in the United States. Scientists and resource managers use 3DEP data for global change research, hydrologic modeling, resource monitoring, mapping and visualization, and many other applications. 3DEP data compose an elevation dataset that consists of seamless layers and a high resolution layer. Each of these layers consists of the best available raster elevation data of the conterminous United States, Alaska, Hawaii, territorial islands, Mexico and Canada. 3DEP data are updated continually as new data become available. Seamless 3DEP data 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 conterminous United States, are referenced to the North American Vertical Datum of 1988 (NAVD 88). The vertical reference will vary in other areas. Seamless 3DEP data are available nationally (except for Alaska) at resolutions of 1 arc-second (approximately 30 meters) and 1/3 arc-second (approximately 10 meters). In most of Alaska, only lower resolution source data are available. As a result, most seamless 3DEP data for Alaska are at 2 arc-second (approximately 60 meters) grid spacing. Part of Alaska is available at the 1 and 1/3 arc-second resolutions from interferometric synthetic aperture radar (ifsar) collections starting in 2010. Plans are in place for collection of statewide ifsar in Alaska. All 3DEP products are public domain.

Access & Use Information


This dataset is part of the following collection:

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Metadata Date January 10, 2018
Metadata Created Date January 11, 2018
Metadata Updated Date January 11, 2018
Reference Date(s) December 26, 2017 (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from 1 Arc-second Digital Elevation Models (DEMs) - USGS National Map

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Thumbnail JPG image

Additional Metadata

Resource Type Dataset
Metadata Date January 10, 2018
Metadata Created Date January 11, 2018
Metadata Updated Date January 11, 2018
Reference Date(s) December 26, 2017 (publication)
Responsible Party U.S. Geological Survey (Point of Contact)
Contact Email
Access Constraints Use Constraints: There is no guarantee or warranty concerning the accuracy of the data. Users should be aware that temporal changes may have occurred since these data were collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of their limitations. Acknowledgement of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data is obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data, nor to imply that changes made were approved or endorsed by the USGS. Please refer to for the USGS disclaimer., Access Constraints: None. Any downloading and use of these data signifies a user's agreement to comprehension and compliance of the USGS Standard Disclaimer. Insure all portions of metadata are read and clearly understood before using these data in order to protect both user and USGS interests.
Bbox East Long -146.998333333413
Bbox North Lat 68.0016666667846
Bbox South Lat 66.998333333418
Bbox West Long -148.00166666678
Collection Package Id 4c7396d3-21c7-4cc2-8c34-e42c4cc50ec3
Coupled Resource
Frequency Of Update asNeeded
Graphic Preview Description Thumbnail JPG image
Graphic Preview File
Graphic Preview Type JPEG
Harvest Object Id aef992d1-ac9e-4b4f-bb52-15dfe23c41c9
Harvest Source Id 1cef56f4-b56e-4835-886c-6db830e7eee6
Harvest Source Title 1 Arc-second Digital Elevation Models (DEMs) - USGS National Map
Licence Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Metadata Language
Metadata Type geospatial
Progress underDevelopment
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2014-01-01
Temporal Extent End 2016-01-01

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