geodesy.noaa.gov

Apply the current NGS hybrid geoid model in GNSS workflows

Download NGS CORS RINEX data for post-processing

Check NGS datum modernization status and prepare for the new reference frames

Convert NAD83 GNSS ellipsoidal heights to NAVD88 orthometric heights using the NOAA NGS Geoid Height Service API

Retrieve a predicted gravity value at a project location from NGS GRAV-D survey data for high-precision geoid/height work

Convert survey coordinates between datums, reference frames, and coordinate systems (geographic, SPC, UTM, XYZ, USNG) using the NGS NCAT web service API

Retrieve NOAA NGS survey control point datasheets (PID, bounding box, or radial search) via the NGS Data Explorer API to recover benchmark coordinates for field control

Find the nearest NOAA CORS Network station and pull its coordinates and RINEX data for RTK/GNSS baseline planning using the NCN API

Convert or transform coordinates across datums using the NOAA NGS NCAT web service

Compute geoid height at a coordinate using the NOAA NGS Geoid Height Service API

Retrieve survey mark (benchmark) datasheet data using the NOAA NGS Data Explorer API

Process static GPS/GNSS observations for high-precision coordinates via NOAA's OPUS service