Northern
California National Elevation Metadata
GEODATASET NAME: NCA_NEDA83
IDENTIFICATION INFORMATION
Description:
Northern California Pilot Study Area elevation grid (NED).
Abstract:
The National Elevation Dataset (NED) is a seamless mosaic of the
best-available, 30 meter, 7.5-minute elevation data for the conterminous
United States. NED has been processed to provide a much-improved base of
elevation data for calculating slope and hydrologic derivatives.
Data Type:
Grid
Data Originator:
U. S. Department of the Interior
U. S. Geological Survey
National Mapping Division
EROS Data Center
edcnts12.cr.usgs.gov/ned/About.htm
Data Processor:
Ed Evanson
Lockheed Martin Environmental Services
1050 E. Flamingo Road, Suite E120
Las Vegas, NV 89119
(702)897-3208
eevanson@lmepo.com
Data Provider:
Dan Heggem
U.S. Environmental Protection Agency NERL
P.O. Box 93478
Las Vegas, NV 89193-3478
(702)798-2278
heggem.daniel@epa.gov
Keywords:
Northern California, Pilot Study Area, National Elevation Dataset, NED
Version:
N/A
Status:
Interim
Revision Number:
0
Series Name:
Online Link (URL):
Time Period of Content:
Use Constraints:
None. Acknowledgment of the originating agencies would be appreciated in
products derived from these data.
Purpose:
Northern California data browser
Date of metadata entry/update:
09/06/2001
No Publication Information Available
No File Security Information Available
DATA QUALITY INFORMATION
Cloud Cover:
Not applicable
Software:
Arc/Info 7.2
Operating System:
Unix
Path Name:
/gis/wemap/nca/ned
Logical Consistency Report:
Not presently available
Completeness Report:
Not presently available
Horizontal Positional Accuracy:
Not presently available
Vertical Positional Accuracy:
Not presently available
Attribute Accuracy:
Not presently available
Procedures:
The National Elevation Dataset grids for Northern California were
mosaiced and the output grid clipped to the Northern California boundary.
The output grid was projected to region 9 Albers projection.
Reviews Applied to Data
Lockheed Martin Environmental Services internal review
Related Spatial Data Files:
All geodatasets with nca_ prefix.
Other References Cited:
Notes:
Update Frequency:
As needed
SPATIAL REFERENCE INFORMATION
Description of Grid nca_neda83
Cell Size = 30.000 Data Type: Integer
Number of Rows = 16666 Number of Values = 4297
Number of Columns = 11301 Attribute Data (bytes) = 8
BOUNDARY STATISTICS
Xmin = -653135.228 Minimum Value = -8.000
Xmax = -314105.228 Maximum Value = 4301.000
Ymin = 4044257.955 Mean = 907.449
Ymax = 4544237.955 Standard Deviation = 543.521
COORDINATE SYSTEM DESCRIPTION
Projection ALBERS
Datum NAD83
Units METERS Spheroid GRS1980
Parameters:
1st standard parallel 33 15 0.000
2nd standard parallel 40 15 0.000
central meridian -116 45 0.00
latitude of projection's origin 0 0 0.000
false easting (meters) 0.00000
false northing (meters) 0.00000
ENTITY AND ATTRIBUTE INFORMATION
Annotation Name:
ATTRIBUTE LISTING FOR: nca_neda83.vat
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED?
1 VALUE 4 10 B - Indexed
5 COUNT 4 10 B - -
METADATA REFERENCE SECTION
FGDC Content Standards for Digital Geospatial Metadata
FGDC Standards Version 6/98 / metadata.aml ver. 1.3 5/21/99
SUPPLEMENTAL METADATA (where available)
Abstract: 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.
Purpose: Geospatial elevation data are utilized by the scientific and
resource management communities for global change research, hydrologic
modeling, resource monitoring, mapping, and visualization applications.
Distribution_Liability: Although these data have been processed successfully
on a computer system at the U.S. Geological Survey, EROS Data Center, no
warranty expressed or implied is made by either regarding the utility of the
data on any system, nor shall the act of distribution constitute any such
warranty. The USGS will warrant the delivery of this product in
computer-readable format and will offer appropriate adjustment of credit
when the product is determined unreadable by correctly adjusted computer
peripherals, or when the physical medium is delivered in damaged condition.
Requests for adjustments of credit must be made within 90 days from the date
of this shipment from the ordering site.