NOAA’s National Geodetic Survey (NGS) provides the framework for all positioning activities in the Nation. The foundational elements of latitude, longitude, elevation, and shoreline …

Explore our publicly available Web services that allow users to access to NGS APIs.

The Leveling Projects Page allows users to obtain data (leveling height differences) and metadata along any level line which has been loaded into the NGS Integrated Database.

The stations are independently owned and operated. Each agency shares their GNSS carrier phase and code range measurements and station metadata with NGS, which are analyzed …

Nov 17, 2025 · * required fields We may use your data for internal evaluations of OPUS use, accuracy, or related research.

NGS provides access to all NCN data collected since February 9, 1994 (1994:040). The data include observation, meteorological, navigation/ephemeris, station logs and NGS coordinate …

NGS's authoritative spatial data, models, and tools are vital for the protection and management of natural and manmade resources and support the economic prosperity and environmental …

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Sort by.... * Rate (sampling rate) is valid for 30 days. After that the data are decimated to 30 seconds # Freq (frequency) is the number of mins past the start of collection that the file is …

NGS has developed a list of bench marks that provide the ideal spatial resolution for this transformation grid. Extensive analysis was performed on all bench marks currently in the …