Hydrologic Unit Codes (HUC)
Procedures_Used: Bob Lamke revised HUC boundaries on 1:250,000 quads for State of Alaska. Revised boundaries were digitized, edited and quads joined to complete HUC coverage for State of Alaska. HUC coverage was joined with 1:1,000,000 outline coverage of State of Alaska. HUC numbers (HUC_CODES) and plotting notation (LABEL) were added to HUC coverage. Plotting notations (LINE) was added to identify Cataloging Unit, Subregional, Regional and International boundaries
Revisions: This is a preliminary version, to be reviewed and revised as necessary - November 23, 1994.
Reviews_Applied_to_Data: Coverage has not been reviewed to date, November 23, 1994.
Related_Spatial_and_Tabular_Data_Sets:
Other_References_Cited: Hydrologic Unit Map-1987, State of Alaska, U.S. Geological Survey.
Notes: Definitions of line coding: Line = 1 - Cataloging Unit Boundary Line = 2 - Sub-regional Boundary Line = 3 - Regional Boundary Line = 4 - International Border
HUC_CODE - Hydrologic Unit Code for each polygon within map of State of Alaska LABEL - 0 & 1 coding for plotting HUC numbers on map LINE - 1, 2, 3, 4 coding for identifying boundaries for plotting