Upcoming Webinars

On the Trail of the Changing Alaskan Geoid: Results of the 2025 GeMS Validation Survey

Presenter: Ryan Hardy, PhD, Geodesist, Gravity and Heights Division, NGS; Kevin Jordan, Cartographer, Field Operations Division, NGS

The 2025 GeMS Validation Survey continues NGS’s effort to measure high-resolution geoid change, height change, and geoid accuracy to validate NAPGD2022 in the valleys of southcentral Alaska. Hear the story of the challenging gravity, GNSS, and astronomical field work and the surprising initial scientific results.

>> Learn more about this webinar.