F 285 — NGS JC1130 — Monroe County, US

This triangulation station is part of the NGS network that establishes the fundamental horizontal control framework for surveying and mapping across the United States. Located in Monroe County, Illinois, at coordinates 38.51028° N, 90.25361° W, this trig point serves as a reference for accurate position determination in regional and local surveys. Trig stations of this type were historically established to provide precise positional control through intervisible networks. Such monumentation supports cadastral surveys, engineering projects, and spatial data applications across civil infrastructure. The NGS network remains essential for maintaining consistency in coordinate systems and enabling accurate georeferencing of geospatial information. Documentation and periodic verification of established control points like this one ensures the integrity of surveying networks and allows surveyors to tie modern measurements to the national geodetic datum. Maintaining records of such benchmarks preserves institutional knowledge and supports professional surveying practice.

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