Color Conterminous United States Shaded Relief – 200-Meter Resolution

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: National Atlas of the United States

Publication_Date: 200512

Title:

Color Conterminous United States Shaded Relief – 200-Meter Resolution

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>

Description:

Abstract:

The color conterminous United States shaded relief data were derived from National Elevation Dataset (NED) data, and show the terrain of the conterminous United States 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.

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
-2262900.0000
1038900.0000

The following projection file can be used when using ESRI's ArcGIS to view the GeoTIFF (any line breaks should be removed): PROJCS["NAD_1983_Lambert_Azimuthal_Equal_Area",GEOGCS ["GCS_Sphere_ARC_INFO",DATUM["D_Sphere_ARC_INFO",SPHEROID ["Sphere_ARC_INFO",6370997.0,0.0]],PRIMEM["Greenwich",0.0], UNIT["Degree",0.0174532925199433]],PROJECTION ["Lambert_Azimuthal_Equal_Area"],PARAMETER["False_Easting",0.0], PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian", -100.0],PARAMETER["Latitude_Of_Origin",45.0],UNIT["Meter",1.0]]

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 200209

Currentness_Reference: Date of elevation data download

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -133

East_Bounding_Coordinate: -59

North_Bounding_Coordinate: 51

South_Bounding_Coordinate: 19

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: elevation

Theme_Keyword: imageryBaseMapsEarthCover

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: Alabama

Place_Keyword: Arizona

Place_Keyword: Arkansas

Place_Keyword: California

Place_Keyword: Colorado

Place_Keyword: Connecticut

Place_Keyword: Delaware

Place_Keyword: District of Columbia

Place_Keyword: Florida

Place_Keyword: Georgia

Place_Keyword: Idaho

Place_Keyword: Illinois

Place_Keyword: Indiana

Place_Keyword: Iowa

Place_Keyword: Kansas

Place_Keyword: Kentucky

Place_Keyword: Louisiana

Place_Keyword: Maine

Place_Keyword: Maryland

Place_Keyword: Massachusetts

Place_Keyword: Michigan

Place_Keyword: Minnesota

Place_Keyword: Mississippi

Place_Keyword: Missouri

Place_Keyword: Montana

Place_Keyword: Nebraska

Place_Keyword: Nevada

Place_Keyword: New Hampshire

Place_Keyword: New Jersey

Place_Keyword: New Mexico

Place_Keyword: New York

Place_Keyword: North Carolina

Place_Keyword: North Dakota

Place_Keyword: Ohio

Place_Keyword: Oklahoma

Place_Keyword: Oregon

Place_Keyword: Pennsylvania

Place_Keyword: Rhode Island

Place_Keyword: South Carolina

Place_Keyword: South Dakota

Place_Keyword: Tennessee

Place_Keyword: Texas

Place_Keyword: Utah

Place_Keyword: Vermont

Place_Keyword: Virginia

Place_Keyword: Washington

Place_Keyword: West Virginia

Place_Keyword: Wisconsin

Place_Keyword: Wyoming

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 ArcInfo 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 Alaska Shaded Relief – 200-Meter Resolution

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: 200512

Title: Color Hawaii Shaded Relief – 200-Meter Resolution

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: 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

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 Alaska 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: Conterminous United States Color Elevation Grid

Type_of_Source_Media: Internal file

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2002

Source_Currentness_Reference: Date of elevation data.

Source_Citation_Abbreviation: ElevationUS_2002

Source_Contribution: Elevation information.

Source_Information:

Source_Citation:

Citation_Information:

Originator: USGS Center for EROS

Publication_Date: 200509

Title:

Grayscale Conterminous United States Shaded Relief – 200-Meter Resolution

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: 200209

Source_Currentness_Reference: Date of elevation data.

Source_Citation_Abbreviation: GrayscaleUS

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 the conterminous United States, elevation data were extracted from the NED and projected to a Lambert Azimuthal Equal-Area (LAZ) projection centered on 100 degrees West, 45 degrees North, with a pixel size of 200 meters. The datum for NED data is NAD83, except for Alaska which uses NAD27. Because there is no ellipsoidal form of the Lambert Azimuthal Equal-Area projection, once data have been projected to LAZ they lose any datum affiliation and instead are based on a sphere with a radius of 6370997 meters. However, some commonly-used software packages will report an error if a datum is not specified, so to accommodate such software, the GeoTIFF for this shaded-relief map layer retains the NAD83 datum associated with the original NED data from which it was derived.

Using the ArcInfo Polygrid command, a 0/1 land/water mask was created for the conterminous United States 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: 200212

Source_Produced_Citation_Abbreviation: ElevationUS_2002

Process_Step:

Process_Description:

ElevationUS_2002 was converted in Adobe Photoshop from RGB to CMY (no black generated).

The contrast of GrayscaleUS 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 for use in the online National Atlas.

In the combined image, the water and non-U.S. land areas no longer had the correct values, so they were reset to meet the requirements of the National Atlas Map Maker. Open water areas were selected using Adobe Photoshop’s magic wand function and set to a RGB value of (132, 193, 255). The same technique was used to select non-U.S. land, and the RGB value was set to (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: ElevationUS_2002

Source_Used_Citation_Abbreviation: GrayscaleUS

Process_Date: 200508

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 17280

Column_Count: 25740

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Lambert Azimuthal Equal Area

Lambert_Azimuthal_Equal_Area:

Longitude_of_Projection_Center: -100.00

Latitude_of_Projection_Center: 45.00

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: Sphere

Semi-major_Axis: 6370997.0

Denominator_of_Flattening_Ratio: 1.0

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: 20060829

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