Vertical Datum:
North AmericanVertical Datum of 1988 (NAVD88)Horizontal Datum: Washington State Plane
Coordinate System, North Zone, North American Datum of 1983, 1991 adjustment (NAD83/91),
U.S. Survey Feet
NOTE: To convert between City
of Seattle and NAVD88 Datums, use:
("City of Seattle Datum" + 9.7 ft. = NAVD88)
There are inconsistencies in the City of Seattle Datum, the conversion may vary up to +/-
1 ft. in specific areas throughout the City. In areas and applications where a more
accurate conversion factor is critical, elevations should be field checked and vertical
relationships between the two datums be determined for that particular area.
Copyright (c) 1999, THE CITY OF SEATTLE, all rights
reserved. No warranties of any sort, including accuracy, fitness or merchantability,
accompany this product.
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