DATE: 10/25/99
DATA LIBRARY: H:\cum_effect\data\roadwork\
COVERAGE NAME: sonc24rdstrs2
SOURCE: Appended 1:24,000 Scale USGS DLG Data Feb, 2000.
METADATA FILE: sonc24rdstrs2.txt
METADATA PREPARER: Chris Trudel, GIS Analyst
LEGACY-TLC
POB 59
Arcata, CA. 95518
(707)826-9408 fax: (707)826-0966
www.legacy-tlc.org
COVERAGE DESCRIPTION:
This coverage depicts 24k roads for the Southern Oregon / Northern California Bioregional Domain (SONCBIO).
VITAL STATISTICS:
Projection: UTM
Zone: 10
Units: meters
Datum: NAD27
Spheroid: Clarke 1866
1st Std. Parallel:
2nd Std. Parallel:
Longitude of Origin:
Latitude of Origin:
False Easting (X shift):
False Northing (Y shift):
SOURCE(s):
1) USGS large scale (1:24,000) dlg's
2) Shasta-Trinity N.F., Six Rivers N.F., Mendocino N.F., Klamath N.F., Rogue River N.F., Siskiyou N.F., Winema N.F. and Umpqua N.F.
3) Digitized 1:24k USGS roads data obtained from Jim Stritholt (Earth Design Consultants, Corvalis Oregon); Rogue River Valley Oregon and some of the CA redwood region where USGS data was unavailable.
4) CDF 1:24,000 roads as of October 1999.
SOURCE MEDIA:
SOURCE PROJECTION: UTM 10
SOURCE UNITS: meters
SOURCE SCALE: 24,000
CAPTURE METHOD:
CONVERSION SOFTWARE:
( ) PC ARC/INFO; (x) WORKSTATION ARC/INFO
( ) OTHER (SPECIFY):
VERSION: 7.2.1
DATA STRUCTURE: vector
ARC/INFO COVERAGE TYPE: line
ARC/INFO PRECISION: double
ARC/INFO TOLERANCES: default
NUMBER OF FEATURES: 290,240 arcs, 256,275 nodes
Layer Size: ~186 MB
Data Updated:
Updated by:
Notes/Comments:
DATA DICTIONARY:
NOTE: Items common to all ARC/INFO coverages: FNODE#, TNODE#, LPOLY#, RPOLY#, LENGTH, COVER#, and COVER-ID are not described here.
ARC ATTRIBUTE TABLE (.AAT)
ITEM NAME WIDTH OUTPUT TYPE N.DEC DESCRIPTION
ROAD_NUM 30 30 C - Mendocino N.F. code
ROAD_CLASS 6 6 C - Winema N.F. code
TRANS 1 1 C - USFS Remote Sensing Lab code
CFFCODE 3 3 I - USFS Remote Sensing Lab code
ENTITY_LABEL 7 7 I - USGS DLG code
DLGCODE 15 15 C - Description of USGS DLG code
DLGCLASS 2 2 I - Classified USGS DLG code
LEGTYPE 15 15 C - Legacy's label for road type
LEGCLASS 2 2 I - Legacy's class for road type
CBILABEL 40 40 C - J. Stritholts road labels
ROUTE_NO 30 30 C - Rogue River N.F. code
SURFACE 3 3 C - Rogue River N.F. code
SEGMENT_ID 12 12 C - Umpqua N.F. code
ROADALL 12 12 C - Siskiyou N.F.; item
CFF_CODE 4 5 B - CDF; Road Classification
SOURCE_MAP 20 20 C - CDF; Source Map
ROAD_NAME 20 20 C - CDF; Road Name
RD_YR 4 4 I - CDF; Year road built as part of THP only
PERM_CLASS 2 2 C - CDF; Abandoned roads
CODESOURCE 15 15 C - CDF; Source of coding
LEGCLASS LEGTYPE
0
1 Primary
2 Secondary
3 Improved
4 Unimproved
5 Trail
NOTES:
Roads data from the above sources were integrated into one line coverage. The items in this coverage represent some of the original populated items from the source coverages, except dlgcode, dlgclass, legtype, and legclass. The items dlgcode and dlgclass were derived from entity_label and represent USGS large scale dlg attribute codes. The items legtype and legclass were derived by crosswalking the original attribute codes from each source coverage into 5 classes of roads. The Northeast section of the coverage contains no attributes because the source data for that area had no information on road type.
The road layer was notably sparce in the Gualala (NorthWestern-most) quad. Therefore, some of the roads shown in the 1:100k were copied over to the 1:24k layer for this quad. This procedure was not conducted for any of the other quads.
PROCESSING STEPS:
DATA QUALITY ASSESSMENT: Errors of omission and commission may exist.
DOCUMENTATION DATES:
6/29/98: Coverage clipped to fit project study area
Contact Name: P. J. Trichilo
Institute for Fisheries Resources
791 Eighth Stree Ste. N
Arcata, CA 95521
(707) 822-9428