4 — NGS RD0611 — Vancouver, US

This triangulation station is part of the National Geodetic Survey's network, which establishes the foundational control points for the nation's surveying and mapping infrastructure. Located near Vancouver, Washington at coordinates 45.60333°, -122.56917°, this trig point serves as a horizontal reference for regional surveys and engineering projects. Triangulation stations of this type historically provided precise positional control across broad areas before the advent of satellite-based positioning systems. Modern surveyors and engineers continue to verify and document such benchmarks to maintain geodetic continuity, assess potential ground movement, and provide independent validation of positioning systems. The systematic maintenance and cataloging of these reference points remains essential for large-scale construction, boundary determination, and scientific applications requiring high-accuracy horizontal control.

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