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Layer Name: Hydrographic Units
Coverage Name: HYDUNITS
Layer Type: Polygon
Geog. Extent: Islands of Oahu, Maui, Molokai, and Hawaii only.
Projection: Universal Trans Mercator, Zone 4
Description: Hydrographic Units for the islands of Oahu,
Maui, Molokai and Hawaii.
Source: Digitized from the Department of Land & Natural Resources,
Division of Water and Land Development (DOWALD) folded
paper Station Location maps, found in the 1983 open-file
report 81-1056B, "Summary of Available Data on Surface
Water," State of Hawaii, Vol. 3. The scale of the
source maps varied by island, and were as follows:
Molokai, W. Maui and S.E. Maui at 1" = 1 mile (1:63,360)
N.E. Maui at 25/32" = 1 mile (1:81,100.8)
N. Oahu at 13/16" = 1 mile (1:77,981.5)
S. Oahu at 15/16" = 1 mile (1:67,584)
E. Hawaii at 25/32" = 2 miles (1:162,201.6)
N.W. Hawaii at 13/16" = 2 miles (1:155,963)
S.W. Hawaii at 15/16" = 2 miles (1:135,168)
History: Digitized in Arc/Info version 5 using ArcEdit by the
Office of State Planning (OSP) from DLNR/DOWALD maps
described above.
Attributes: Polygons:
AREA area of polygon (sq. meters)
PERIMETER perimeter of polygon (meters)
HYDUNITS# Polygon internal number (for Arc/Info use)
HYDUNITS-ID Polygon ID (for Arc/Info use)
HYDNUM Hydrographic Unit Number
Arcs:
FNODE# From Node Number (for Arc/Info use)
TNODE# To Node Number (for Arc/Info use)
LPOLY# Left Polygon Number (for Arc/Info use)
RPOLY# Right Polygon Number (for Arc/Info use)
LENGTH Length (meters)
HYDUNITS# Arc Internal Number (for Arc/Info use)
HYDUNITS-ID Arc ID (for Arc/Info use)
FLAG Source of Arc
FLAG Definition
0 Digitized arc
1 Extracted arc (from 1:24,000 DLGs)
2 Closure arc
3 Coastline arc
9 Other
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