DATE: 10/25/2002
DATA LIBRARY: \GARCIA\ROADS
COVERAGE NAME: Roads
SOURCE: Appended 1:24,000 Scale USGS DLG Data Feb, 2000.
METADATA FILE: ROADS.TXT
COVERAGE DESCRIPTION:
USGS DLG and digitized base data captured at 1:24,000 augmented with features digitized at 1:12,000; boundaries and feature representations of the record derived from Timber Harvesting Plans (THPs). Coverages include hydrography, roads, timber harvest boundaries (silvicultural units, yarding methods, ownership, completion status)
Purpose:: Contribute to an assessment of cumulative effects from timber harvesting in sensitive watersheds.
Supplemental Information:: Data is derived from maps contained in Timber Harvest Plans, reflects that record, and is generally limited to what is required in the California Forest Practice Rules for that particular year.
VITAL STATISTICS:
Datum: NAD 27
Projection: UTM
Units: Meters
1st Std. Parallel: 34 00 00 (34.0 degrees N)
2nd Std. Parallel: 40 30 00 (40.5 degrees N)
Longitude of Origin: -120 00 00 (120.0 degrees W)
Latitude of Origin: 00 00 00 (0.0 degrees)
False Easting (X shift): 0
False Northing (Y shift): 0
Source: USGS DLG
Source Projection: Universal Transverse Mercator
Zone 10
Source Units: Meters
Source Scale: 1:24,000
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)
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC A
1 FNODE# 4 5 B -
5 TNODE# 4 5 B -
9 LPOLY# 4 5 B -
13 RPOLY# 4 5 B -
17 LENGTH 8 18 F 5
25 ROADS# 4 5 B -
29 ROADS-ID 4 5 B -
33 CFF_CODE 4 5 B -
37 SOURCE_MAP 20 20 C -
57 ROAD_NAME 20 20 C -
77 RD_YR 4 4 I -
81 PERM_CLASS 2 2 C -
83 CODESOURCE 15 15 C -
Coverage Feature Item Name Item description Item Code
ROADS Line CFF_CODE Road Classification 100 = Primary Road (4 + Lanes)
103 = Secondary Road (2 -3 Lanes)
105 = Improved (Rocked)
106 = Unimproved (seasonal)
107 = Temporary & 4WD
115 = Road Interchange
137 = Bridge
SOURCE_MAP Source map USGS 24K DLG
USGS 24K DIG
THP MAP 95-003 etc.
ROAD_NAME Road Name Actual Name / NONE
RD_YR Year Road Built Actual Year Built as part of THP
PERM_CLASS Abandoned Roads AP = Permanent (rocked)
AS = Seasonal
Bridge BR = Bridge
Existing Roads EP = Permanent (rocked)
For. Prac. Perm. ES = Seasonal
Class ET = Temporary & 4WD
Proposed Roads PP = Permanent (rocked)
For. Prac. Perm. PS = Seasonal
Class PT = Temporary & 4WD
Primary Road PR = Primary Road (4 + Lanes)
Road Interchange RI = Road Interchange
Secondary Road SR = Secondary Road (2-3 Lanes.)
CODESOURCE Coding Source Source of coding i.e. THP, USGS etc.
DOCUMENTATION DATES:
10/25/2000: Coverage clipped to fit project study area
Contact Name: P. J. Trichilo
Institute for Fisheries Resources
791 Eighth Street Ste. N
Arcata, CA 95521
(707) 822-9428