521 — NGS RD4244 — Vancouver, US

This trigonometric station is part of the National Geodetic Survey network, which establishes and maintains the fundamental control framework for surveying and mapping throughout the United States. Trig stations serve as precisely positioned reference points that enable surveyors, engineers, and cartographers to conduct accurate measurements and establish local coordinate systems. Located near Vancouver, Washington, this benchmark contributes to regional geodetic control in the Pacific Northwest. The station's published coordinates provide surveyors with a stable, documented reference for both terrestrial and satellite-based positioning work. Verification and documentation of such control points remain essential to surveying infrastructure. Surveyors regularly recover and reobserve these marks to confirm their stability and utility. The NGS network continues to support critical applications including land surveying, engineering projects, and geographic information system development.

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