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100-Meter Resolution Elevation of the Conterminous United States

Identification Information

Citation
Title
100-Meter Resolution Elevation of the Conterminous United States
Originator
Geological Survey (U.S.)
Publisher
National Atlas of the United States
Place of Publication
Rolla , Missouri , US
Publication Date
2012-12-01
Identifier
http://purl.stanford.edu/zz186ss2071
Geospatial Data Presentation Form
mapDigital
Collection Title
National Atlas of the United States of America, 1997-2014
Other Citation Details
These data were downloaded from the National Atlas website (http://www.nationalatlas.gov/atlasftp.html) in August 2014.
Abstract
This layer is a georeferenced raster image displaying elevation data for the conterminous United States. These data were derived from the National Elevation Dataset (NED) released in October, 2012, The elevation data shows the terrain at a resolution of 100 meters. The NED is a raster product assembled by the U.S. Geological Survey, designed to provide national elevation data in a seamless form with a consistent datum, elevation unit, and projection. Data corrections made in the NED assembly process minimize artifacts, permit edge matching, and fill sliver areas of missing data. The NED is updated on a bi-monthly basis. This layer is part of the 1997-2014 edition National Atlas of the United States.
Purpose
The 100-meter resolution elevation data were developed to portray the terrain of the United States at 1:1,000,000 scale. They are intended primarily for visual purposes. The original NED data should be used for conducting analysis and determining the most accurate elevation values. No responsibility is assumed by the National Atlas of the United States in the use of these data.
Supplemental Information
Included with the GeoTIFF are an auxiliary information file (.aux.xml), an image overview file (.ovr), a value attribute database file (.vat.dbf), a .tfw file (more information included below), and a .prj file (more information included below.) The contents of the associated world file (.tfw) are: 100.0 0.0 0.0 -100.0 -2539950.0 3257950.0 The projection (.prj) file contains the following information: PROJCS["Albers_NAD83_L48", GEOGCS["GCS_North_American_1983", DATUM["D_North_American_1983", SPHEROID["GRS_1980",6378137.0,298.257222101]], PRIMEM["Greenwich",0.0], UNIT["Degree",0.0174532925199433]], PROJECTION["Albers"], PARAMETER["False_Easting",0.0], PARAMETER["False_Northing",0.0], PARAMETER["Central_Meridian",-96.0], PARAMETER["Standard_Parallel_1",29.5], PARAMETER["Standard_Parallel_2",45.5], PARAMETER["Latitude_Of_Origin",23.0], UNIT["Meter",1.0]] Data set extent in meters (Albers Equal-Area Conic projection) North 3258000 West -2540000 East 2441000 South 119000 There are no NULL or NODATA values in the GeoTIFF. Instead, all elevation values in oceans have been set to zero as part of the masking process. A copy of the land/water mask used in processing is available on request. Information about National Atlas Web services can be found on the Web Map and Web Feature Services page; see http://nationalatlas.gov/infodocs/webservices.html.
Scale Denominator
1000000
Temporal Extent
Currentness Reference
Source data publication date
Time Instant
2012-10-01T00:00:00
Bounding Box
West
-130.573795
East
-62.664008
North
52.394589
South
21.111398
ISO Topic Category
imageryBaseMapsEarthCover
elevation
Place Keyword
Alabama
Arizona
Arkansas
Colorado
Connecticut
Delaware
Florida
Georgia
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York (State)
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
Rocky Mountains
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington (D.C.)
Washington (State)
West Virginia
Wisconsin
Wyoming
United States
Place Keyword Thesaurus
geonames
Temporal Keyword
2012
Theme Keyword
Digital elevation models
Theme Keyword Thesaurus
lcsh
Legal Constraints
Use Limitation
Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Geological Survey in the use of these data.
Use Restrictions
otherRestrictions
Other Restrictions
This item is in the public domain.
Status
completed
Maintenance and Update Frequency
notPlanned
Collection
Collection Title
National Atlas of the United States of America, 1997-2014
URL
http://purl.stanford.edu/cv275yx9215
Publication Date
1998-01-01
Language
eng
Credit
National Atlas of the United States. (2012). 100-Meter Resolution Elevation of the Conterminous United States. National Atlas of the United States. Available at: http://purl.stanford.edu/zz186ss2071.
Point of Contact
Contact
John Hutchinson
Delivery Point
47914 252nd Street
City
Sioux Falls
Administrative Area
South Dakota
Postal Code
57198-0001
Country
US
Email
atlasmail@usgs.gov
Phone
1 605 594 6049

Spatial Reference Information

Reference System Identifier
Code
5070
Code Space
EPSG
Version
8.6.2

Data Quality Information

Lineage
Process Step
Description
Four elevation mosaics were extracted from the National Elevation Dataset and used to produce elevation data files of the conterminous United States, Alaska, Hawaii, and Puerto Rico and the U.S. Virgin Islands. This map layer includes the data file for the conterminous United States. Elevations in NED are stored in NAD83 geographic coordinates as 32-bit signed floating point data at 1-arc-second resolution. Extracted data were converted to 16-bit signed integer, projected to the NAD83 Albers Equal-Area Conic projection with a pixel size of 100 meters, and the data extent was set to match the National Atlas neatline extent for the subject area. The conterminous United States data set includes elevation data for the parts of Canada and Mexico that fall within the extent listed. Using the ArcGIS Feature-to-Raster command, a 0/1 land/water mask for the conterminous United States was created from the 1:1,000,000-scale National Atlas coastline, at the same 100-meter resolution and with the same extent as the elevation data. The land/water mask was applied to the elevation grid with a software routine that used the ArcGIS Multiply command to clip elevation values that fell in ocean areas. The routine used the ArcGIS Nibble command to fill out elevation values to the coastline. Ocean and non-U.S. areas are set to an elevation value of 0. An intermediate product that has these values set to Null (or Nodata) is available on request. The land/water mask is also available on request.
Process Date
2012-01-01T00:00:00
Source
Title
National Elevation Dataset, 1 arc-second
Publication Date
2012-10-01
Originator
U.S. Geological Survey
Publisher
U.S. Geological Survey
Description
Spatial and attribute information
Source
Title
1:1,000,000-Scale Coastlines of the United States
Publication Date
2012-07-01
Originator
National Atlas of the United States
Description
Spatial and attribute information.

Distribution Information

Format Name
GeoTIFF
Distributor
Stanford Geospatial Center
Online Access
http://purl.stanford.edu/zz186ss2071
Protocol
http
Name
elev48i0100a.tif
Function
download

Content Information

Content Type
image

Spatial Representation Information

Raster
Number of Dimensions
2
Row Count
31390
Column Count
49810
Cell Geometry Type
area
Corner Points
Point
-2540000.000000 119000.000000
Point
-2540000.000000 3258000.000000
Point
2441000.000000 3258000.000000
Point
2441000.000000 119000.000000
Center Point
-49500.000000 1688500.000000

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
edu.stanford.purl:zz186ss2071
Parent Identifier
http://purl.stanford.edu/cv275yx9215.mods
Dataset URI
http://purl.stanford.edu/zz186ss2071
Metadata Date Stamp
2015-10-12
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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