UM 113 — NGS DP3017 — Belleville, US

This triangulation station is part of the National Geodetic Survey's network of control points that form the foundation of the United States' geodetic infrastructure. Located near Belleville, Illinois, at coordinates 38.56260° N, 90.02871° W, this trig point serves as a horizontal control station for surveying and mapping activities across the region. Triangulation stations of this type were established to provide accurate reference positions for cadastral surveys, engineering projects, and spatial data collection. The station's position within the NGS network allows surveyors and geospatial professionals to tie their local measurements to the national coordinate system with established accuracy standards. Verification and documentation of such benchmarks remain valuable for maintaining the integrity of survey networks and ensuring consistency in land records and infrastructure development. Regular confirmation of these reference points supports long-term geodetic stability.

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