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100-Meter Resolution Elevation of Alaska, Albers projection
- Identification Information
- Spatial Reference Information
- Data Quality Information
- Distribution Information
- Content Information
- Spatial Representation Information
- Metadata Reference Information
Identification Information
- Citation
- Title
- 100-Meter Resolution Elevation of Alaska, Albers projection
- 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/sg962yb7367
- 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 Alaska using an Albers projection. The elevation data were derived from National Elevation Dataset (NED) and show 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 data set was derived from NED data released in December, 2010, 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 -3326950.0 2437950.0 The projection (.prj) file contains the following information: PROJCS["Albers_NAD83_Alaska", 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",-154.0], PARAMETER["Standard_Parallel_1",55.0], PARAMETER["Standard_Parallel_2",65.0], PARAMETER["Latitude_Of_Origin",50.0], UNIT["Meter",1.0]] Data set extent in meters (Albers Equal-Area Conic projection) North 2438000 West -3327000 East 1654000 South 346000 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
- 2010-12-01T00:00:00
- Bounding Box
- West
- -180
- East
- 180
- North
- 71.954724
- South
- 43.053445
- ISO Topic Category
- imageryBaseMapsEarthCover
- elevation
- Place Keyword
-
Alaska
- Place Keyword Thesaurus
- geonames
- Temporal Keyword
- 2010
- 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 Alaska, Albers projection. National Atlas of the United States. Available at: http://purl.stanford.edu/sg962yb7367.
- Point of Contact
- Contact
- John Hutchinson
- Delivery Point
- 47914 252nd Street
- City
- Sioux Falls
- Administrative Area
- South Dakota
- Postal Code
- 57198-0001
- Country
- US
- atlasmail@usgs.gov
- Phone
- 1 605 594 6049
Spatial Reference Information
- Reference System Identifier
- Code
- 3338
- 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 Alaska. 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 Alaska data set includes elevation data only for areas in the United States. Using the ArcGIS Feature-to-Raster command, a 0/1 land/water mask for Alaska 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
- 2010-12-01
- 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/sg962yb7367
- Protocol
- http
- Name
- elevaki0100a.tif
- Function
- download
Content Information
- Content Type
- image
Spatial Representation Information
- Raster
- Number of Dimensions
- 2
- Row Count
- 20920
- Column Count
- 49810
- Cell Geometry Type
- area
- Corner Points
- Point
- -3327000.000000 346000.000000
- Point
- -3327000.000000 2438000.000000
- Point
- 1654000.000000 2438000.000000
- Point
- 1654000.000000 346000.000000
- Center Point
- -836500.000000 1392000.000000
Metadata Reference Information
- Hierarchy Level
- dataset
- Metadata File Identifier
- edu.stanford.purl:sg962yb7367
- Parent Identifier
- http://purl.stanford.edu/cv275yx9215.mods
- Dataset URI
- http://purl.stanford.edu/sg962yb7367
- Metadata Date Stamp
- 2016-07-05
- Metadata Standard Name
- ISO 19139 Geographic Information - Metadata - Implementation Specification
- Metadata Standard Version
- 2007
- Character Set
- utf8