SL 122 — NGS AA8643 — Florissant, US

USNGStrigunknown#7413
Latitude
38.791546°
Longitude
-90.285089°
Ellipsoidal h
139.22 m
Ortho h
170.60 m
Verifications
0
Last checked
Never
This trigonometric station is part of the National Geodetic Survey's network of control points that form the foundation of the United States' horizontal and vertical datums. Located near Florissant, Missouri, at coordinates 38.79155° N, 90.28509° W, this trig point serves as a precisely positioned reference for surveying, mapping, and engineering projects throughout the region. Trigonometric stations such as this are typically established at elevated or strategically visible locations to facilitate sight lines for conventional surveying methods. The ellipsoidal elevation of 139.2 meters provides vertical control data essential for accurate geospatial reference. Documentation and verification of such benchmarks remain important for maintaining the integrity of the geodetic infrastructure. Surveyors and geospatial professionals rely on these established control points for project accuracy, coordinate transformation, and quality assurance in boundary determination and mapping applications.

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SL 122 — NGS AA8643 — Florissant, US is a triangulation station located in United States, catalogued in the US NGS dataset. The point has been assigned the stable identifier #7413 on SurveyingPedia and sits at an approximate elevation of 170.6 metres. Its coordinates in WGS84 are 38.791546°, -90.285089°, corresponding to 38° 47′ 29.57″ N, 90° 17′ 6.32″ W in the traditional degrees-minutes-seconds format. This page is a self-updating reference — all data is aggregated from public open sources and cross-checked periodically against the originating agency.

Professional surveyors, engineers, and topographers use points like SL 122 — NGS AA8643 — Florissant, US to anchor total-station traverses, verify GNSS/RTK solutions, calibrate levelling instruments, and validate survey deliverables against known coordinates. The record on this page is refreshed daily via automated pipelines that monitor the public sources for any updates, corrections, or status changes.

Coordinate formats

WGS84 (decimal)38.791546, -90.285089
WGS84 (DMS)38° 47′ 29.57″ N, 90° 17′ 6.32″ W
UTM zone (approx.)Zone 15N (approx.)
Elevation170.60 m
Precise conversionOpen in coordinate converter →

Geodetic context in United States

The national geodetic reference in United States is maintained by National Geodetic Survey (NGS). The active datum is NAD83(2011) / NATRF2022 (active). Coordinates shown on this page are expressed in WGS84 (ETRF/ITRF-compatible) which is directly usable in most modern GNSS receivers. For cadastral work in United States you may need to convert to the local datum using the Coordinate Hub.

Browse the full list of indexed control points in United States from the country page.

Nearby benchmarks

The closest 6 indexed control points within roughly 50 km of this location:

US NGS · triangulation station
SL 131 — NGS AA8653 — Saint Louis County, US
3.1 km away · US
US NGS · triangulation station
SL 123 — NGS AA8644 — Ferguson, US
3.1 km away · US
US NGS · triangulation station
SL 117 — NGS AA8636 — Ferguson, US
4.3 km away · US
US NGS · triangulation station
SL 118 — NGS AA8637 — Florissant, US
4.3 km away · US
US NGS · triangulation station
MODOT BELLEFONT CORS ARP — NGS DN6075 — Bellefontaine Neighbors, US
4.5 km away · US
US NGS · triangulation station
MODOT BELLEFONT CORS ARP — NGS DM3511 — Bellefontaine Neighbors, US
4.5 km away · US

Frequently asked questions

What is SL 122 — NGS AA8643 — Florissant, US?

SL 122 — NGS AA8643 — Florissant, US is a triangulation station located in United States, catalogued in the US NGS network. It has the public identifier #7413 and sits at an elevation of 170.6 metres. The point is used for geodetic reference, topographic surveys, and related measurement workflows.

Where are the exact coordinates of SL 122 — NGS AA8643 — Florissant, US?

The position of SL 122 — NGS AA8643 — Florissant, US in WGS84 is 38.791546°, -90.285089° (decimal), or 38° 47′ 29.57″ N, 90° 17′ 6.32″ W in degrees-minutes-seconds. For planar surveys in United States this falls approximately in UTM Zone 15N (approx.).

How can I reach and visit this triangulation station?

Use the satellite imagery above to see the surrounding area. You can open this location directly in Google Maps, Google Earth, Bing Maps, or OpenStreetMap using the buttons provided. Many geodetic points are accessible to the public; some are on protected or private land — check local regulations before any field visit. Always bring documentation or your credentials if you plan to use the marker for professional measurement.

Is this point verified and usable for professional surveying?

This record has been community-verified 0 times. Data quality depends on the source: NGS and official national agency points are typically centimetre-accurate, OpenStreetMap survey points are metre-accurate, and GeoNames topographic landmarks (peaks, hills) are reference-grade only. Always cross-reference with the original agency datasheet before using this point for cadastral, legal, or safety-critical work.

Original source: this record was imported from ngs_public. Always refer to the original datasheet for the most up-to-date and authoritative data.