UM 111 — NGS DP3015 — Belleville, US

This NGS triangulation station is located near Belleville, Illinois at coordinates 38.55125° N, 90.01154° W. As a trig point within the National Geodetic Survey network, this station serves as a fundamental control point for the horizontal geodetic framework of the United States. Triangulation stations of this type were historically established to create a network of precisely positioned reference points supporting surveying, mapping, and engineering projects across the country. The station's coordinates tie into the broader NGS control network, which remains essential infrastructure for cadastral surveys, construction projects, and geographic information systems. Verification and documentation of existing benchmark positions like this one provide continuing value by enabling surveyors to validate local control networks and maintain the accuracy of spatial data. The absence of recorded elevation data suggests the primary function of this point was horizontal positioning within the regional triangulation framework.

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