STATE SURVEY 9 12 1969 — NGS TU1627 — Waipahu, US

This triangulation station is part of the National Geodetic Survey's network, which establishes and maintains the fundamental geodetic framework for the United States. As a trigonometric point, this monument served to control surveying operations and provide accurate horizontal positioning for mapping and engineering projects across Hawaii. Located near Waipahu on the Island of Oahu, this benchmark represents a critical reference point within the Hawaiian Islands survey network. Trigonometric stations of this class were traditionally established at elevated or strategically visible locations to facilitate sightline observations between multiple control points. The verification and documentation of such geodetic monuments remain valuable for land surveying, civil engineering, and geospatial applications. Maintaining accurate records of these reference points supports cadastral surveys, infrastructure development, and contributes to the broader North American Datum framework essential for regional coordinate systems.

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