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The bench marks are located around the Illinois Grain Corporation property. The tide gage and staff were located on a concrete sea wall feet m SW of the grain elevators. NGVD29 is a fixed datum adopted as a national standard geodetic reference for heights but is now considered superseded. NGVD29 was originally derived from a general adjustment of the first-order leveling networks of the U. Numerous local and wide-spread adjustments have been made since establishment in
The NAVD88 elevation relationship shown in the table is derived from an average of several bench mark elevations relative to tide station datum.
Where both VM and PID are indicated, both tidal and geodetic elevations are available for the bench mark listed. The bench marks are located around the Illinois Grain Corporation property. Numerous local and wide-spread adjustments have been made since establishment in The Vertical Mark VM and PID shown on the bench mark sheet are unique identifiers for bench marks in the tidal and geodetic databases, respectively.
NGVD29 is a fixed datum adopted as a national standard geodetic reference for heights but is now considered superseded. Granny chat lines gary was originally derived from a general adjustment of the first-order leveling networks of the U. As a result of this averaging, NAVD88 bench mark elevations computed indirectly from the tidal datums elevation table may differ slightly from NAVD88 elevations listed for each bench mark in the NGS database.
The tide gage and staff were located on a concrete sea wall feet m SW of the grain elevators.