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 information impact …

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 and distributed free …

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 health of …

Nov 17, 2025 · Process your GNSS data in the National Spatial Reference System

Web service that distributes the geoid height of the NGS geoid models in a concise and portable way. The web service provides the geoid height (of a model specified by its model ID) at any given latitude …

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 available to NGS.

Dec 7, 2023 · NGS defines the official geodetic datums for all federal mapping activities in the U.S. and its territories (see Table 1) as part of the National Spatial Reference System (NSRS).

NGS supports surveyors and others with high-accuracy Global Navigation Satellite System (GNSS) data, ground control marks, models and tools, guidelines and tutorials.

NGS has developed a prioritized list of bench marks on which new GPS observations will be most helpful to develop the best transformations between the current vertical datums and the modernized …