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100-Meter Resolution Grayscale Shaded Relief of Alaska
- 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 Grayscale Shaded Relief of Alaska
- Originator
- Geological Survey (U.S.)
- Publisher
- National Atlas of the United States
- Place of Publication
- Rolla , Missouri , US
- Publication Date
- 2013-04-01
- Identifier
- http://purl.stanford.edu/qz033pg4379
- 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 map layer is a 100-meter resolution grayscale shaded relief image of Alaska, in an Albers Equal-Area Conic projection. Shaded relief was created with the ArcGIS Hillshade command, with 45-degree sun elevation, 315-degree azimuth, and a z-factor of 1.0. Very dark and very light shades both represent steeper terrain. Mid-range grays represent flatter terrain. The grayscale shaded relief data were derived from the National Atlas 100-meter resolution elevation data. The elevation data were derived from 2012 National Elevation Dataset (NED) data and show the terrain of Alaska 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. This layer is part of the 1997-2014 edition National Atlas of the United States.
- Purpose
- The 100-meter resolution grayscale shaded relief 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
- The Grayscale Shaded Relief data set was derived from 100-meter resolution elevation data that are also distributed by the National Atlas of the United States. Characteristics and development of the elevation data are described in the metadata for that data set. Included with the GeoTIFF are an information file (.xml), 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. 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.
- Temporal Extent
- Currentness Reference
- Publication date
- Time Instant
- 2013-04-01T00:00:00
- 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
- 2013
- Theme Keyword
- Digital elevation models
-
Topographic maps
- 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. (2013). 100-Meter Resolution Grayscale Shaded Relief of Alaska. National Atlas of the United States. Available at: http://purl.stanford.edu/qz033pg4379.
- 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
- The Grayscale Shaded Relief image is derived from National Atlas AK Elevation 2012. Elevation data were processed in the ArcGIS Hillshade command with 45-degree sun elevation, 315-degree azimuth, and a z-factor of 1.0. Hillshade produces a 1-band grayscale image with values from 0 to 255. The grayscale shaded relief image produced by Hillshade was loaded into Photoshop and, using the land/water mask, all non-U.S. areas and all ocean water were set to a pixel value of 255. This was done on the assumption that the primary use for this shaded relief image will be in combination with other datasets, and that any image values or colors, other than relief shading, would be extraneous.
- Process Date
- 2013-01-01T00:00:00
- Source
- Title
- 100-Meter Resolution Land/Water Mask of Alaska
- Publication Date
- 2013-04-01
- Originator
- U.S. Geological Survey
- Publisher
- National Atlas of the United States
- Description
- Spatial information
- Source
- Title
- 100-Meter Resolution Elevation of Alaska
- Publication Date
- 2012-12-01
- Originator
- U.S. Geological Survey
- Publisher
- 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/qz033pg4379
- Protocol
- http
- Name
- srgraki0100a.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:qz033pg4379
- Parent Identifier
- http://purl.stanford.edu/cv275yx9215.mods
- Dataset URI
- http://purl.stanford.edu/qz033pg4379
- Metadata Date Stamp
- 2015-08-12
- Metadata Standard Name
- ISO 19139 Geographic Information - Metadata - Implementation Specification
- Metadata Standard Version
- 2007
- Character Set
- utf8