60S A — NGS AD9558 — Vancouver, US

This triangulation station is part of the National Geodetic Survey's network of control points that form the foundation of the United States' surveying and mapping infrastructure. Located near Vancouver, Washington, this trig point provides precise horizontal and vertical reference data for regional geodetic surveys. The ellipsoidal elevation of -15.7 meters reflects the point's position relative to the WGS 84 reference ellipsoid. Trig stations of this type are established to support accurate positioning for engineering projects, land surveying, and cartographic work. Verification and documentation of such control points ensures the integrity of the geodetic network and maintains consistency across survey operations in the region. Regular confirmation of coordinate values and physical monument condition remains essential for sustained utility of the national control point infrastructure.

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