CSL 20 — NGS AA8580 — St. Louis, US

This triangulation (trig) station is part of the National Geodetic Survey's network, which establishes the foundational horizontal and vertical control for surveying and mapping activities across the United States. Located near St. Louis, Missouri, at coordinates 38.70021°, -90.26473° with an ellipsoidal elevation of 130.7 meters, this point serves as a reference monument for professional surveyors and engineers. Trig stations of this classification provide precise positional data essential for cadastral surveys, infrastructure projects, and geospatial analysis. The NGS network maintains these points to ensure consistency and accuracy in surveying work throughout the nation. Documentation and periodic verification of such benchmarks remain critical for sustaining the integrity of the geodetic framework, particularly in regions of ongoing development and construction activity.

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