D 284 — NGS JC1140 — Cahokia, US
USNGStrigunknown#7230
Latitude
38.548457°
Longitude
-90.193393°
Ellipsoidal h
100.33 m
Ortho h
131.17 m
Verifications
0
Last checked
Never
This triangulation station is part of the National Geodetic Survey's network of control points that form the foundation of horizontal and vertical positioning infrastructure across the United States. Located in southwestern Illinois near Cahokia, this trig point serves as a reference for mapping, surveying, and engineering projects throughout the region.
Triangulation stations like this provide essential geodetic control by establishing accurate horizontal positions through sightline measurements between elevated points. The documented ellipsoidal elevation of 100.3 meters contributes to the network's three-dimensional accuracy. Such benchmarks remain valuable for verifying modern survey work, validating GPS and GNSS measurements, and maintaining consistency across large-scale projects. Regular documentation and accessibility of these control points ensure continuity of surveying standards and support infrastructure development, property surveys, and scientific research dependent on reliable positional data.
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