9 4 — NGS TU0638 — Waipahu, US

This trigonometric station is part of the National Geodetic Survey network, which establishes and maintains the fundamental geodetic control framework for the United States. Trigonometric stations serve as precise horizontal and vertical reference points essential for surveying, mapping, and engineering projects. Located near Waipahu on the island of Oahu, Hawaii, this benchmark contributes to geodetic coverage across the Hawaiian archipelago. The coordinates 21.37636°N, 158.02618°W define its horizontal position within the NGS database. Verification and documentation of such control points remain vital to surveying professionals, as these monuments anchor local surveys and support infrastructure development. Maintaining accurate records of benchmark locations and their monumentation ensures continuity of surveying work and allows surveyors to tie new projects to established geodetic datums. This point represents part of the critical control network upon which Hawaii's spatial framework depends.

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