Precise Digital Leveling. Section 6 Vertical Datum. Vertical Datum. Local/Regional Assumed City, County International Great Lakes Datum 1955 (IGLD55) International Great Lakes Datum 1985 (IGLD85) Tidal Datums National National Geodetic Vertical Datum of 1929 (NGVD29)
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Precise Digital Leveling
First-Order Leveling Network NGVD 29
Vertical Control Network NAVD 88
NAVD 88 minus
(units = cm)
Point Reyes, Drakes Bay, California
Geodetic and Tidal
Geodetic and Tidal Datum Relationships
Importance of Shoreline
AL, AK, CA, CT, FL, GA, LA, MD, MS, NJ, NY, NC, OR, RI, SC, WA
Exclusive Economic Zone
State Submerged Lands
Federal Submerged Lands
3 n. mi.
12 n. mi.
200 n. mi.
DE, MA, ME, NH, PA, VA