Color Alaska Shaded Relief - 200-Meter Resolution, Albers projection

Metadata also available as

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: National Atlas of the United States
Publication_Date: 200603
Title:
Color Alaska Shaded Relief - 200-Meter Resolution, Albers projection
Geospatial_Data_Presentation_Form: Map
Publication_Information:
Publication_Place: Reston, VA
Publisher: National Atlas of the United States
Online_Linkage: <http://nationalatlas.gov/atlasftp.html>
Description:
Abstract:
The color Alaska shaded relief data were derived from National Elevation Dataset (NED) data, and show the terrain of Alaska at a resolution of 200 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 National Atlas also includes a Lambert Azimuthal Equal Area projection shaded relief file; this file is the same data in an Albers projection.
Purpose:
The color shaded relief images were developed to portray the terrain of the United States. They are intended for visual purposes only. The original NED data must be used for conducting analysis and determining elevation values.
Supplemental_Information:
The associated world file is included as part of the GeoTIFF. The contents of the world file are:
200.0000
0.000000
0.000000
-200.0000
-3390900.0000
2449900.0000
The following projection file can be used when using ESRI's ArcGIS to view the GeoTIFF (any line breaks should be removed): PROJCS["Albers_NAD_1983_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]]
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 200603
Currentness_Reference: Publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: 167
East_Bounding_Coordinate: -122
North_Bounding_Coordinate: 77
South_Bounding_Coordinate: 40
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: Elevation
Theme_Keyword: Imagery/Base Maps/Earth Cover
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Digital Elevation Model
Theme_Keyword: Shaded Relief
Theme_Keyword: Topography
Theme_Keyword: Topographic
Theme_Keyword: DEM
Theme_Keyword: NED
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: United States
Place_Keyword: Alaska
Access_Constraints: None.
Use_Constraints:
None. Acknowledgment of the U.S. Geological Survey, Center for EROS and (or) the National Atlas of the United States would be appreciated in products derived from these data.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: John Hutchinson
Contact_Organization: SAIC
Contact_Address:
Address_Type: Mailing address
Address: USGS Center for EROS
City: Sioux Falls
State_or_Province: SD
Postal_Code: 57198-0001
Country: USA
Contact_Voice_Telephone: 605-594-6049
Contact_Electronic_Mail_Address: hutch@usgs.gov
Native_Data_Set_Environment:
1-band TIFF format created using Arc/INFO 8.3 and then processed through custom software to create the GeoTIFF format.
Cross_Reference:
Citation_Information:
Originator: National Atlas of the United States
Publication_Date: 200512
Title:
Color Conterminous United States Shaded Relief – 200-Meter Resolution
Publication_Information:
Publication_Place: Reston, VA
Publisher: National Atlas of the United States
Other_Citation_Details: Lambert Azimuthal Equal Area projection
Online_Linkage:
<http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
Cross_Reference:
Citation_Information:
Originator: National Atlas of the United States
Publication_Date: 200512
Title: Color Alaska Shaded Relief – 200-Meter Resolution
Publication_Information:
Publication_Place: Reston, VA
Publisher: National Atlas of the United States
Other_Citation_Details: Lambert Azimuthal Equal Area projection
Online_Linkage:
<http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
Cross_Reference:
Citation_Information:
Originator: National Atlas of the United States
Publication_Date: 200512
Title: Color Hawaii Shaded Relief – 200-Meter Resolution
Publication_Information:
Publication_Place: Reston, VA
Publisher: National Atlas of the United States
Other_Citation_Details: Lambert Azimuthal Equal Area projection
Online_Linkage:
<http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
Cross_Reference:
Citation_Information:
Originator: National Atlas of the United States
Publication_Date: 200512
Title:
Color Puerto Rico and the U.S. Virgin Islands Shaded Relief – 200- Meter Resolution
Publication_Information:
Publication_Place: Reston, VA
Publisher: National Atlas of the United States
Other_Citation_Details: Lambert Azimuthal Equal Area projection
Online_Linkage:
<http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
Cross_Reference:
Citation_Information:
Originator: National Atlas of the United States
Publication_Date: 200603
Title:
Color Conterminous United States Shaded Relief – 200-Meter Resolution, Albers projection
Publication_Information:
Publication_Place: Reston, VA
Publisher: National Atlas of the United States
Online_Linkage:
<http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
Cross_Reference:
Citation_Information:
Originator: National Atlas of the United States
Publication_Date: 200603
Title:
Color Hawaii Shaded Relief – 200-Meter Resolution, Albers projection
Publication_Information:
Publication_Place: Reston, VA
Publisher: National Atlas of the United States
Online_Linkage:
<http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
Cross_Reference:
Citation_Information:
Originator: National Atlas of the United States
Publication_Date: 200603
Title:
Color Puerto Rico and the U.S. Virgin Islands Shaded Relief – 200- Meter Resolution, Albers projection
Publication_Information:
Publication_Place: Reston, VA
Publisher: National Atlas of the United States
Online_Linkage:
<http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>

Data_Quality_Information:
Logical_Consistency_Report:
No tests for logical consistency have been performed on this map layer.
Completeness_Report:
Data completeness reflects the content of the original NED elevation data.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2002
Title: National Elevation Dataset
Edition: 1
Publication_Information:
Publication_Place: Sioux Falls, SD
Publisher: U.S. Geological Survey
Online_Linkage: <http://ned.usgs.gov/>
Type_of_Source_Media: Online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2002
Source_Currentness_Reference: Date of elevation data download.
Source_Citation_Abbreviation: National Elevation Dataset
Source_Contribution: Elevation information.
Source_Information:
Source_Citation:
Citation_Information:
Originator: National Atlas of the United States
Publication_Date: 1999
Title: Shoreline file in Lambert Azimuthal Equal Area projection
Publication_Information:
Publication_Place: Reston, VA
Publisher: National Atlas of the United States
Type_of_Source_Media: Internal file
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1972
Ending_Date: 1999
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: shorelp020l
Source_Contribution: Shoreline mask for area of coverage.
Source_Information:
Source_Citation:
Citation_Information:
Originator: USGS, Center for EROS
Publication_Date: Unpublished material
Title: Alaska Color Elevation Grid, Albers
Type_of_Source_Media: Internal file
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2005
Source_Currentness_Reference: Processing date
Source_Citation_Abbreviation: ElevationAK_2005
Source_Contribution: Elevation information.
Source_Information:
Source_Citation:
Citation_Information:
Originator: USGS, Center for EROS
Publication_Date: 200603
Title:
Grayscale Alaska Shaded Relief – 200-Meter Resolution, Albers projection
Geospatial_Data_Presentation_Form: Map
Publication_Information:
Publication_Place: Reston, VA
Publisher: National Atlas of the United States
Online_Linkage:
<http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
Type_of_Source_Media: Online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 200603
Source_Currentness_Reference: Publication date
Source_Citation_Abbreviation: GrayscaleAK_Albers
Source_Contribution: Elevation information.
Process_Step:
Process_Description:
Four elevation mosaics were extracted from the National Elevation Dataset (NED) and used to produce the shaded relief images of the conterminous United States, Alaska, Hawaii, and Puerto Rico and the U.S. Virgin Islands. A separate image was created for each of the four areas because, at 200-meter resolution, file size for an elevation mosaic of all of the United States would exceed the processing capacity of some commonly-used GIS and image processing software packages.
For Alaska, elevation data were extracted from the NED and projected to an Albers Conical Equal-Area projection, with a pixel size of 200 meters. The datum for NED Alaska data is NAD27, so the data were converted to NAD83 before the projection was performed.
Using the ArcInfo Polygrid command, a 0/1 land/water mask was created for Alaska at the same 200 meter resolution as the elevation data, using coastline data clipped from the National Atlas shoreline file. The land/water mask was applied to the 16-bit elevation grid. The masked elevation grid as well as the mask itself is available on request. More information on the NED may be found by following the links at <http://ned.usgs.gov>.
A color elevation image was created by slicing the elevation data using the ranges (listed in feet; divide by 3.2808 to get meters) and RGB color values below.
From    To     index     red     green   blue
---------------------------------------------------
-250    0      1         220     220     220
1       249    2         127     159     101
250     499    3         130     176     112
500     999    4         160     194     124
1000    1499   5         185     214     124
1500    1999   6         207     224     156
2000    2499   7         223     233     168
2500    2999   8         241     238     166
3000    3499   9         237     223     159
3500    3999   10        240     210     141
4000    4499   11        230     188     138
4500    4999   12        216     165     133
5000    5499   13        197     149     135
5500    5999   14        217     165     156
6000    6499   15        227     183     177
6500    6999   16        223     192     191
7000    7499   17        239     205     217
7500    7999   18        244     215     225
8000    8499   19        243     223     233
8500    8999   20        248     227     232
9000    9499   21        248     233     238
9500    9999   22        246     240     245
10000   19476  23        255     255     255
Water          0         132     193     255

Source_Used_Citation_Abbreviation: National Elevation Dataset
Source_Used_Citation_Abbreviation: shorelp020l
Process_Date: 200501
Source_Produced_Citation_Abbreviation: ElevationAK_2005
Process_Step:
Process_Description:
ElevationAK_2005 was converted in Adobe Photoshop from RGB to CMY (no black generated).
The contrast of GrayscaleAK_Albers was enhanced in Adobe Photoshop by using a tritone technique. The enhanced grayscale image was added as a black band to the converted color elevation image to create a CMYK color shaded relief image. The CMYK image was converted in Photoshop to RGB.
In the combined image, the water and non-U.S. land areas no longer had the desired values, so they were reset to match those used in the National Atlas Map Maker. Using Adobe Photoshop’s Magic Wand function, ocean water and non-U.S. land were selected and masked. Ocean water was set to RGB value (132, 193, 255) and non-U.S. land was set to RGB value (132, 158, 172).
The Photoshop image was saved in as a TIFF, ingested into ArcInfo as a grid using the command IMAGEGRID, saved as a TIFF from ArcInfo using the command GRIDIMAGE, and then processed through a USGS GeoTIFF software program to create a fully-compliant GeoTIFF with valid header information.
Source_Used_Citation_Abbreviation: ElevationAK_2005
Source_Used_Citation_Abbreviation: GrayscaleAK_Albers
Process_Date: 200603

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 10580
Column_Count: 25545

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Albers Conical Equal Area
Albers_Conical_Equal_Area:
Standard_Parallel: 55.00
Standard_Parallel: 65.00
Longitude_of_Central_Meridian: -154.00
Latitude_of_Projection_Origin: 50.00
False_Easting: 0.0
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: Row and column
Coordinate_Representation:
Abscissa_Resolution: 200.0
Ordinate_Resolution: 200.0
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: None
Ellipsoid_Name: GRS1980
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Shaded relief TIFF image grid cell
Entity_Type_Definition: Any of the data elements in the shaded relief file.
Entity_Type_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Shaded relief TIFF image values
Attribute_Definition: Color values for the TIFF image.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 255

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Earth Science Information Center, U.S. Geological Survey
Contact_Address:
Address_Type: Mailing address
Address: 507 National Center
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: 1-888-ASK-USGS (1-888-275-8747)
Contact_Voice_Telephone: 703-648-5920
Contact_Instructions:
In addition to the address above there are other ESIC offices throughout the country. A full list of these offices is at <http://ask.usgs.gov/esic_index.html>.
Distribution_Liability:
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. Use of trademarks or formats does not constitute endorsement by the U.S. Geological Survey. There are no copyright restrictions on the use, redistribution, or further processing of this map layer. No responsibility is assumed by the U.S. Geological Survey in the use of these data.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: TIFF
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
Fees: There is no charge for the map layer.

Metadata_Reference_Information:
Metadata_Date: 20060310
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peg Rawson
Contact_Organization: National Atlas of the United States
Contact_Address:
Address_Type: Mailing address
Address: 12201 Sunrise Valley Drive
Address: MS-561
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: 703-648-4183
Contact_Electronic_Mail_Address: atlasmail@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Security_Information:
Metadata_Security_Classification_System: None
Metadata_Security_Classification: Unclassified
Metadata_Security_Handling_Description: None

Generated by mp version 2.9.12 on Thu Mar 09 14:07:31 2017