U 13 — NGS TU0636 — Waipahu, US

This trigonometric station is part of the National Geodetic Survey's network of reference points that establish the geometric framework for surveying and mapping across the United States. Trig stations serve as control points for terrestrial surveys, providing precise horizontal positioning data essential for professional surveying work, cadastral mapping, and infrastructure development. Located near Waipahu on the island of Oahu, Hawaii, this benchmark contributes to geodetic control in the Hawaiian Islands. The coordinates 21.36023°N, 158.02962°W situate the point within this densely populated region of the state. As part of the NGS integrated network, this station's documented position supports accuracy in local surveys and maintains consistency with the national datum. Verification and documentation of such control points remain valuable for the surveying profession, ensuring reliability of positional data for present and future projects. Professional surveyors depend on the integrity of these reference marks for establishing survey baselines and validating modern measurement techniques.

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