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 …

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 …

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 …

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 …

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

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 …

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 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 …

VERTCON 3.0 release 20190601 is functionally implemented in NGS’s Coordinate Conversion and Transformation Tool (NCAT). Unlike earlier versions of VERTCON, VERTCON 3.0 …