PEARSON AZ MK — NGS RD4111 — Vancouver, US

This triangulation station is part of the National Geodetic Survey's network, which establishes the fundamental horizontal and vertical control framework for the United States. Located near Vancouver, Washington at coordinates 45.62210° N, 122.66868° W, this trig point serves as a reference monument for surveying, mapping, and engineering projects throughout the region. Triangulation stations like this one were historically established to create precise positional control through intervisible networks. The ellipsoidal elevation of -9.9 meters reflects the point's position relative to the WGS84 reference ellipsoid. Verification and documentation of such benchmarks remain essential for maintaining survey accuracy, validating modern positioning technologies, and ensuring consistency in large-scale geodetic work. This point contributes to the spatial reference infrastructure supporting infrastructure development, land management, and scientific applications across the Pacific Northwest.

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