HDH R — NGS AA3574 — Honolulu County, US

This trigonometric station is part of the National Geodetic Survey's network, which establishes the fundamental horizontal and vertical control framework for the United States. Located in Honolulu County, Hawaii, at coordinates 21.57912°N, 158.20406°W with an ellipsoidal elevation of 18.4 meters, this benchmark serves as a reference point for surveying, mapping, and geospatial applications throughout the Hawaiian Islands region. Trigonometric stations like this one provide essential ground control for cadastral surveys, engineering projects, and scientific observations. The precise documentation and periodic verification of such control points ensure the accuracy and reliability of spatial data for both public and private sector users. Maintenance of these geodetic monuments supports continuity in surveying practice and contributes to the broader goal of consistent, standardized positioning information across the nation's surveying and mapping infrastructure.

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