National Elevation Dataset 30 Meter 1-degree Tiles

Metadata also available as

Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator:
U.S. Department of Agriculture (USDA) Natural Resources Conservation Services, National Cartography & Geospatial Center
Originator:
U.S. Department of Agriculture, Natural Resources Conservation Service, National Cartography & Geospatial Center
Publication_Date: Unknown
Title: National Elevation Dataset 30 Meter 1-degree Tiles
Edition: 1
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: Fort Worth, TX
Publisher: National Cartography & Geospatial Center
Online_Linkage: <http://datagateway.nrcs.usda.gov>
Description:
Abstract:
The U.S. Geological Survey has developed a National Elevation Database (NED).The NED is a seamless mosaic of best-available elevation data. The 7.5-minute elevation data for the conterminous United States are the primary initial source data. In addition to the availability of complete 7.5-minute data, efficient processing methods were developed to filter production artifacts in the existing data, convert to a consistent datum, edge-match, fill slivers of missing data at quadrangle seams, recast the data to a consistent geographic projection and convert all elevation values to decimal meters as a consistent unit of measure.

NED has a resolution of one-third arc-second (approximately 10 meters) for much of the conterminous United States, Hawaii and Puerto Rico in a NAD83 datum. There is a resolution of two arc-seconds for Alaska and the datum is NAD27.

NED at 10 meters is created using the same methods outlined above with the source data being mostly the 10m DEMs. DEMs at 5 meters, 1/3 arc-second, and 1/9 arc-second maps are also used where available. In some cases, the 10m NED is resampled from LIDAR or created using aerial photography.

One of the effects of the NED processing steps is a much-improved base of elevation data for calculating slope and hydrologic derivatives. Artifact removal greatly improves the quality of the slope, shaded-relief, and synthetic drainage information that can be derived from the elevation data.  Geospatial elevation data are used by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping, and visualization applications.

The 30 meter NED is ~1 arc-second data that is updated over large areas by integrating the 10 meter or better source data(where available), re-sampled to 1 arc-second. Where 10 meter or better is not available, 30 meter is used.

NRCS has elected to ONLY serve NED 30 maps in a UTM projection and in one degree quadrangles. These two facts differentiate the maps from those served at http://seamless.usgs.gov/.
Purpose:
Geospatial elevation data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, soils mapping, resource monitoring, mapping, and visualization applications.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: unknown
Ending_Date: unknown
Currentness_Reference: publication date
Status:
Progress: In work
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -124.7333
East_Bounding_Coordinate: -067.9500
North_Bounding_Coordinate: 49.3833
South_Bounding_Coordinate: 24.5333
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD Parameter Keywords
Theme_Keyword: EARTH SCIENCE
Theme_Keyword: LAND SURFACE
Theme_Keyword: TOPOGRAPHY
Theme_Keyword: LANDFORMS
Theme_Keyword: TERRAIN ELEVATION
Theme_Keyword: 1-DEGREE DEM
Theme_Keyword: 2-ARC-SECOND DEM
Theme_Keyword: 7.5-MINUTE DEM
Theme_Keyword: CARTOGRAPHY
Theme_Keyword: DEM
Theme_Keyword: DIGITAL ELEVATION MODEL
Theme_Keyword: DIGITAL MAPPING
Theme_Keyword: EDC
Theme_Keyword: EROS
Theme_Keyword: GEODATA
Theme_Keyword: GIS
Theme_Keyword: MAPPING
Theme_Keyword: RASTER
Theme_Keyword: USGS
Theme_Keyword: NRCS
Theme_Keyword: NCGC
Theme_Keyword: Gateway
Place:
Place_Keyword_Thesaurus: GCMD Location Keywords
Place_Keyword: NORTH AMERICA
Place_Keyword: UNITED STATES
Place_Keyword: UNITED STATES OF AMERICA
Access_Constraints: None
Use_Constraints:
None. Acknowledgement of the originating agencies would be appreciated in products derived from these data.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: National Cartography & Geospatial Center
Contact_Address:
Address_Type: mailing address
Address: USDA Natural Resources Conservation Service
Address: National Cartography & Geospatial Center
Address: 501 W. Felix St.
City: Fort Worth
State_or_Province: Texas
Postal_Code: 76115
Country: United States
Contact_Voice_Telephone: 817-509-3400
Contact_Facsimile_Telephone: 817-509-3469
Native_Data_Set_Environment:
Microsoft Windows NT Version 4.0 (Build 1381) Service Pack 6; ESRI ArcCatalog 8.1.0.642
Data_Quality_Information:
Logical_Consistency_Report: Not Applicable.
Completeness_Report:
Review of shaded relief for completness of data and verifies mosaic and reprojection was run properly.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey (USGS), EROS Data Center
Publication_Date: Unknown
Title: National Elevation Dataset
Online_Linkage: <http://edcnts12.cr.usgs.gov/ned/ned.html>
Type_of_Source_Media: FTP download
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: unknown
Ending_Date: unknown
Source_Citation_Abbreviation: NED
Source_Contribution:
The U.S. Geological Survey has developed a National Elevation Dataset (NED). The NED is a seamless mosaic of best-available elevation data. The 7.5-minute elevation data for the conterminous United States are the primary initial source data. In addition to the availability of complete 7.5-minute data, efficient processing methods were developed to filter production artifacts in the existing data, convert to the NAD83 datum, edge-match, and fill slivers of missing data at quadrangle seams. One of the effects of the NED processing steps is a much-improved base of elevation data for calculating slope and hydrologic derivatives.
Process_Step:
Process_Description:
The data is acquired from USGS as Oracle Transportable Tablespaces. It is loaded to NCGC SDE servers and extracted in a UTM projection by gateway ArcObjects services.
Process_Date: Refer to metadata information.
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: varies
Column_Count: varies
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 10-19
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: varies
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 30.000000
Ordinate_Resolution: 30.000000
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
ArcInfo Grid - Cell Size: one arc-second Data type: floating point Number of Rows: varies Number of Lines: varies Projection: UTM Datum: NAD83 Horizontal Units: meters Zunits: meters

ArcView Shapefile - Three File Types: .dbf. shp. shx, prj

Enhanced Shaded Relief - tif and tfw files as geotiff

ned30m_metadata.xml ned30m_metadata.html ned30m_readme.txt USGS_NED30m_factsheet.pdf

Entity_and_Attribute_Detail_Citation:
U.S. Department of the Interior, U.S. Geological Survey, 1998, Standards for Digital Elevation Models: Reston, VA.

Softcopy in Adobe Acrobat Portable Document File (PDF) format: <http://rockyweb.cr.usgs.gov/nmpstds/demstds.html>

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: National Cartography & Geospatial Center
Contact_Person: Customer Services Representative
Contact_Address:
Address_Type: mailing and physical address
Address: Natural Resources Conservation Service
Address: National Cartography & Geospatial Center
Address: 501 Felix St., Bldg 23
City: Fort Worth
State_or_Province: Texas
Postal_Code: 76115
Country: USA
Contact_Voice_Telephone: 817-509-3400
Contact_Facsimile_Telephone: 817-509-3469
Resource_Description: National Elevation Dataset (NED)
Distribution_Liability:
Although these data have been processed successfully on a computer system at the U.S. Department of Agriculture, no warranty expressed or implied is made by the Agency regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. The U.S. Department of Agriculture, nor any of its agencies are liable for misuse of the data, for damage, for transmission of viruses, or for computer contamination through the distribution of these data sets. The U.S. Department of Agriculture prohibits discrimination in its programs on the basis of race, color, national origin, sex, religion, age, disability, political beliefs, and marital or familial status. (Not all prohibited bases apply to all programs.)
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: GEOTIFF
Format_Specification: geotif image format
File_Decompression_Technique: tar and gzip
Transfer_Size: between 1-107 MB
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: Geospatial Data Gateway
Online_Computer_and_Operating_System: <http://datagateway.nrcs.usda.gov>
Offline_Option:
Offline_Media: CD-ROM
Recording_Capacity:
Recording_Density: 650
Recording_Density_Units: MB
Recording_Format: ISO 9660, Level 2, Mode 1
Fees: $50 per CD-ROM
Ordering_Instructions:
Two processes for obtaining data. Free by ftp or charge if by CD-ROM.
Available_Time_Period:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: unknown
Metadata_Reference_Information:
Metadata_Date: 20011120
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: National Cartography & Geospatial Center
Contact_Person: Customer Services Representative
Contact_Address:
Address_Type: mailing and physical address
Address: Natural Resources Conservation Service
Address: National Cartography & Geospatial Center
Address: 501 Felix St. Bldg 23
City: Fort Worth
State_or_Province: Texas
Postal_Code: 76115
Country: USA
Contact_Voice_Telephone: 817-509-3400
Contact_Facsimile_Telephone: 817-509-3469
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.7.33 on Wed Apr 07 17:43:35 2004