NAVD 88
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Version vom 2. März 2006, 16:13 Uhr von HeinzJ (Diskussion | Beiträge)
NAVD 88 is a vertical (elevation) reference system for U.S., Canada and Mexico. Published in 1991 the orthometric heights are derived from an adjustment of leveling data constrained at a single point on the St. Lawrence Seaway.
