Data:NED: Difference between revisions
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{{Data description | {{Data description | ||
|One-line data description= | |One-line data description=U.S. National Elevation Dataset (NED) topographic relief model; 1/9 arc-second (~3 m) cell size to 2 arc-second (~60 m) cell size | ||
|Extended data description=The National Elevation Dataset (NED) is the primary elevation data product of the USGS. The NED is a seamless dataset with the best available raster elevation data of the conterminous United States, Alaska, Hawaii, and territorial islands. The NED is updated on a nominal two month cycle to integrate newly available, improved elevation source data. All NED data are public domain. The NED is derived from diverse source data that are processed to a common coordinate system and unit of vertical measure. NED 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. NED data are available nationally (except for Alaska) at resolutions of 1 arc-second (about 30 meters) and 1/3 arc-second (about 10 meters), and in limited areas at 1/9 arc-second (about 3 meters). In most of Alaska, only lower resolution source data are available. As a result, most NED data for Alaska are at 2-arc-second (about 60 meters) grid spacing | |Extended data description=The National Elevation Dataset (NED) is the primary elevation data product of the USGS. The NED is a seamless dataset with the best available raster elevation data of the conterminous United States, Alaska, Hawaii, and territorial islands. The NED is updated on a nominal two month cycle to integrate newly available, improved elevation source data. All NED data are public domain. The NED is derived from diverse source data that are processed to a common coordinate system and unit of vertical measure. NED 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. NED data are available nationally (except for Alaska) at resolutions of 1 arc-second (about 30 meters) and 1/3 arc-second (about 10 meters), and in limited areas at 1/9 arc-second (about 3 meters). In most of Alaska, only lower resolution source data are available. As a result, most NED data for Alaska are at 2-arc-second (about 60 meters) grid spacing. Part of Alaska is available at the 1- and 1/3-arc-second resolution, and plans are in development for a significant improvement in elevation data coverage of the state. | ||
|Upload image dataset=NED.png | |Upload image dataset=NED.png | ||
|Caption dataset image= | |Caption dataset image=Image of conterminous U.S. NED topography | ||
}} | }} | ||
{{Data format | {{Data format | ||
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|Data origin=Modeled | |Data origin=Modeled | ||
|Data format=ArcExport | |Data format=ArcExport | ||
|Data resolution=1 arc-second ( | |Data resolution=2 arc-second (~ 60 m; AK), 1 arc-second (~30 m), 1/3 arc-second (~10 m), and 1/9 arc-second (~ 3 m; limited areas) cell sizes (horizontal); 0.1 m (vertical) | ||
|Data projection= | |Data projection=NAD 83 geographic (horizontal); NAVD 88 (vertical) | ||
}} | }} | ||
{{Dataset coverage | {{Dataset coverage | ||
|Data spatial coverage=United States, Alaska, Hawaii, and | |Data spatial coverage=Conterminous United States, Alaska, Hawaii, Puerto RIco, and island territories. | ||
|Data temporal coverage=Time | |Data temporal coverage=Time averaged | ||
}} | }} | ||
{{Dataset availability | {{Dataset availability | ||
Revision as of 14:20, 24 March 2013
NED dataset information page
Short Description
 |
| Image of conterminous U.S. NED topography |
Statement: U.S. National Elevation Dataset (NED) topographic relief model; 1/9 arc-second (~3 m) cell size to 2 arc-second (~60 m) cell size
Abstract: The National Elevation Dataset (NED) is the primary elevation data product of the USGS. The NED is a seamless dataset with the best available raster elevation data of the conterminous United States, Alaska, Hawaii, and territorial islands. The NED is updated on a nominal two month cycle to integrate newly available, improved elevation source data. All NED data are public domain. The NED is derived from diverse source data that are processed to a common coordinate system and unit of vertical measure. NED 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. NED data are available nationally (except for Alaska) at resolutions of 1 arc-second (about 30 meters) and 1/3 arc-second (about 10 meters), and in limited areas at 1/9 arc-second (about 3 meters). In most of Alaska, only lower resolution source data are available. As a result, most NED data for Alaska are at 2-arc-second (about 60 meters) grid spacing. Part of Alaska is available at the 1- and 1/3-arc-second resolution, and plans are in development for a significant improvement in elevation data coverage of the state.
Data format
| Data type: | Topography |
| Data origin: | Modeled |
| Data format: | ArcExport |
| Other format: | |
| Data resolution: | 2 arc-second (~ 60 m; AK), 1 arc-second (~30 m), 1/3 arc-second (~10 m), and 1/9 arc-second (~ 3 m; limited areas) cell sizes (horizontal); 0.1 m (vertical) |
| Datum: | NAD 83 geographic (horizontal); NAVD 88 (vertical) |
Data Coverage
Spatial data coverage: Conterminous United States, Alaska, Hawaii, Puerto RIco, and island territories.
Temporal data coverage: Time averaged
Time period covered:
Availability
Download data: http://seamless.usgs.gov/
Data source: http://ned.usgs.gov/
References
- Gesch, D., Evans, G., Mauck, J., Hutchinson, J., Carswell Jr., W.J., 2009, The National Map—Elevation: U.S. Geological Survey Fact Sheet 2009-3053, 4 p.
