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 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 …

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

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

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 …

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).

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.

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 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 NGS database to identify …

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 release 20190601 …