UP — NGS RD2971 — Portland, US

This triangulation station is part of the National Geodetic Survey's network, which establishes the horizontal and vertical control framework for surveying and mapping across the United States. Located near Portland, Oregon, at coordinates 45.54659° N, 122.69028° W, this trig point serves as a fundamental reference for local and regional surveys. Triangulation stations of this type were historically established to provide accurate positional control across areas of varying terrain and development. They remain valuable for verifying survey networks, maintaining spatial consistency in mapping projects, and supporting infrastructure development. Professional surveyors depend on properly documented geodetic control points to ensure accuracy and legal defensibility in boundary surveys, engineering projects, and cartographic work. Continued verification and documentation of NGS control points supports the integrity of the national geodetic datum and enables reliable spatial reference for future surveying activities in the region.

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