HDH B — NGS AA3573

This triangulation station represents an integral component of the National Geodetic Survey's horizontal control network that establishes the foundational reference framework for surveying and mapping activities throughout the United States. Located at coordinates 21.57902° N, 158.19184° W at an ellipsoidal elevation of 17.9 meters, this trig point serves as a monumented control station for precise geodetic measurements in the Hawaiian region. Triangulation stations of this classification were established to provide surveyors, engineers, and cartographers with reliable positional references for local and regional surveys. The documentation and verification of such benchmark locations remain essential to maintaining the integrity of the national spatial reference system and supporting ongoing surveying operations. Regular confirmation of monument condition and coordinate accuracy ensures continued utility for contemporary positioning work and geodetic applications.

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