Data Quality Information
Spatial Data Organization Information
Spatial Reference Information
Entity and Attribute Information
Metadata Reference Information
I. IDENTIFICATION INFORMATION
Data Set Identity: roads
An ARC coverage describing major roads extracted from USGS DLG CD-ROM. The road number is identified and the extraction was done for major roads only. The coverage was compiled by the U. S. Bureau of Reclamation Mid Pacific Region GIS Service Center.
Supplemental Information: n/a
Data Set Status: in use
West Bounding Coordinate: -124.5048
East Bounding Coordinate: -114.2648
North Bounding Coordinate: 41.9886
South Bounding Coordinate: 32.4234
Theme Keyword: Transportation, Roads
Browse Graphic File Name: roads.gif
Browse Graphic File Description: Graphic of the state and federal highways of California.
Browse Graphic File Type: GIF
The data are from USGS DLG and are NOT to be considered CURRENT.
There are no restrictions of access to this dataset.
Native Data Set Environment:
ARC/INFO software version 7.0.3 running on IBM RS6000 with AIX 3.2.5
Raster File Format: n/a
Raster File Sensor: n/a
Vector File Format: ARCE7 (ARC/INFO Export format, version 7)
Nonspatial File Format: n/a
Attribute Accuracy: n/a
Attribute Accuracy Explanation: n/a
Logical Consistency Report:
Chain-node topology present.
Completeness Report: Minor roads deliberately omitted. Major roads only.
Horizontal Positional Accuracy: 40 meters
Horizontal Positional Accuracy Explanation: Resolution as reported
Vertical Positional Accuracy: n/a
Vertical Positional Accuracy Explanation: n/a
The original DLG files were extracted from a May 1993 USGS CD-ROM containing DLG files in 100K tiles for the Central Pacific States, otherwise known as Area 12 by the USGS National Mapping Division.
Source Date: The DLG data vintage is that which can be found from USGS National Mapping Division.
Source Distance Resolution: n/a
An AML was written to convert the DLG to ARC format and use the appropriate major/minor codes to attribute the items NUM and TYPE. The coverage was projected from UTM to Albers Equal Area by the UCSB Biogeography Lab.
Native Data Structure: spatial vector
Raster File Row (Line) Count: n/a
Raster File Column (Sample) Count: n/a
Raster File Vertical (Band) Count: n/a
Raster File Number of Bytes per Pixel: n/a
Geographic Coordinate Units: Degrees, minutes and decimal seconds
Map Projection Name: Albers Conical Equal Area
Map Projection Description:
Distance Resolution (meters): n/a
Altitude Resolution (meters): n/a
TYPE Describes type of road
NUM Road or highway number identifier from USGS DLG major-minor codes
MARKERSYM Markersymbol to use for highway.mrk
Attribute Definition Source:
USGS DLG--Data Users Guide #2
Entity and Attribute Detail Citation:
US Geological Survey. 1989. Digital Line Graphs from 1:100,000 Scale Maps, Data Users Guide #2. Reston, VA.
ftp address: ftp://ftp.biogeog.ucsb.edu/pub/org/biogeog/data/gap_analysis
The University of California assumes no responsibility for application of the data beyond their original intent.
Standard Order Process:
Data are available through anonymous ftp and the World Wide Web at the ftp address and URL address listed under Distributor.
File Decompression Technique: None
Transfer Size: 1.4 Mb in gzip compressed format; 4.4 Mb uncompressed
Metadata Date: 07/15/98
Metadata Standard Name: Metadata Standards for Gap Analysis
Metadata Standard Version: 09/05/94
Metadata Review Date: n/a
Contact Person Primary: CHUCK JOHNSON
Contact Mail Address: