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100-Meter Resolution Color Shaded Relief of Alaska

Identification Information

Citation
Title
100-Meter Resolution Color Shaded Relief of Alaska
Originator
Geological Survey (U.S.)
Publisher
National Atlas of the United States
Place of Publication
Reston , VA
Publication Date
2013-04-01
Identifier
http://purl.stanford.edu/yw041vw3863
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
The Color Shaded Relief of Alaska map layer is a 100-meter resolution color-sliced elevation image of Alaska, with relief shading added to accentuate terrain features, in an Albers Equal-Area Conic projection. The image was produced by combining the 100-meter resolution color-sliced elevation and the grayscale shaded relief data sets that are distributed by the National Atlas of the United States. The color shaded relief data were derived from the National Atlas 100-meter resolution elevation data. The elevation data were derived from National Elevation Dataset (NED) data and show the terrain of the conterminous United States 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 of the National Atlas of the United States.
Purpose
The 100-meter resolution color 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 Color Shaded Relief data set was created as a combination of the 100-meter resolution color-sliced elevation image and the grayscale shaded relief image of the same area, both of which are also distributed separately by the National Atlas. Development of those data sets is described in their respective metadata. Included with the GeoTIFF are an information file (.xml), an auxiliary information file (.aux.xml), an image overview file (.ovr), 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.
Scale Denominator
1000000
Temporal Extent
Currentness Reference
Publication date
Time Instant
2013-04-01
Bounding Box
West
-180
East
180
North
71.954724
South
43.053445
ISO Topic Category
imageryBaseMapsEarthCover
elevation
geoscientificInformation
Place Keyword
United States
Alaska
Place Keyword Thesaurus
geonames
Temporal Keyword
2013
Theme Keyword
Altitudes
Topographic maps
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. (2013). 100-Meter Resolution Color Shaded Relief of Alaska. National Atlas of the United States. Available at: http://purl.stanford.edu/yw041vw3863.
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
3338
Code Space
EPSG
Version
8.6.2

Data Quality Information

Lineage
Process Step
Description
The color shaded relief image is a combination of the color-sliced elevation map layer and the grayscale shaded relief map layer that are distributed by the National Atlas of the United States. Characteristics and development of those two data sets are documented in their respective metadata. The two source files were combined in Photoshop in the following steps: In Photoshop National Atlas AK Color Sliced Elevation 2013 was opened as an Index color image and colors loaded from a Photoshop color look-up table. The metadata for National Atlas AK Color Sliced Elevation 2013 contains a listing of classes and color values. The Photoshop color look-up table file is available on request. Color separation settings were set to UCR, No black generation, 300 percent maximum CMY. The color-sliced elevation image was converted from Index mode to CMYK mode. The color separation settings ensured that all colors were CMY only. National Atlas AK Grayscale Shaded Relief 2013 was copied and pasted into the K band of the new image. Color separation settings were re-set to UCR, Maximum black generation, 400 percent maximum CMYK. The new CMYK image was converted to RGB to create the final image. Ocean areas were set to an RGB value of (193,224,250). Non-U.S. areas (if any) were set to an RGB value of (240,235,211).
Process Date
2013-01-01T00:00:00
Source
Title
100-Meter Resolution Grayscale Shaded Relief of Alaska
Publication Date
2013-04-01
Originator
U.S. Geological Survey
Publisher
National Atlas of the United States
Description
Spatial and attribute information
Source
Title
100-Meter Resolution Color-Sliced Elevation of Alaska
Publication Date
2013-03-01
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/yw041vw3863
Protocol
http
Name
srcoaki0100a.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:yw041vw3863
Parent Identifier
http://purl.stanford.edu/cv275yx9215.mods
Dataset URI
http://purl.stanford.edu/yw041vw3863
Metadata Date Stamp
2015-08-12
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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