CSL 21 — NGS AA8581 — St. Louis, US
USNGStrigunknown#7068
Latitude
38.703864°
Longitude
-90.222729°
Ellipsoidal h
99.87 m
Ortho h
131.10 m
Verifications
0
Last checked
Never
This trigonometric station is part of the National Geodetic Survey's network of control points that establish the horizontal and vertical framework for surveying and mapping throughout the United States. Located near St. Louis, Missouri, at coordinates 38.70386° N, 90.22273° W, this trig point serves as a reference station for regional and local survey work. The ellipsoidal elevation of 99.9 meters provides vertical control tied to the national datum. Trig stations such as this are monumented points established to facilitate precise positioning for infrastructure projects, cadastral surveys, and geographic information systems. Verification and documentation of these control points remain essential for maintaining geodetic accuracy and ensuring consistency across surveying operations in the region.
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