O REILLY — NGS TU1517 — Honolulu County, US

This trigonometric station is part of the National Geodetic Survey's network of control points that form the foundation of the United States' geodetic infrastructure. Located in Honolulu County, Hawaii, at coordinates 21.55703° north latitude and 158.06831° west longitude, this trig point serves as a reference station for surveying, mapping, and geospatial applications throughout the Hawaiian Islands region. Trigonometric stations of this class are established to provide precise horizontal and vertical control for surveying operations. The NGS maintains this network to support cadastral surveys, engineering projects, and geographic information systems. Verification and documentation of such benchmarks remain essential for surveying professionals conducting work in Hawaii, ensuring consistency and accuracy in spatial data collection and land surveys.

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