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Geodesy icon - a globe

Geodesy

The science of accurately measuring and understanding the Earth's geometric shape, orientation in space, and gravity field.

An illustration of Earth from space, with a satellite orbiting above and bright lines connecting locations across the globe.

Modernizing the National Spatial Reference System

NOAA’s National Geodetic Survey is modernizing the National Spatial Reference System (NSRS), to provide more accurate, consistent, and reliable latitude, longitude, height, and gravity information.

An airplane flying over a coastal area

Aerial Photography and Shoreline Mapping

Since the early 1900s, the National Geodetic Survey has been taking photographs from airplanes to capture the Earth below.

image cover from the new geodesy video

What is Geodesy?

Geodesy is the science of accurately measuring and understanding the Earth's geometric shape, orientation in space, and gravity field. Geodesy: It's the invisible utility that supports and connects everything around you.

A lidar map of Lynnhaven Inlet, Virginia.

Lidar: Lasers, airplanes, and drones

Lidar — Light Detection and Ranging — uses lasers to remotely examine the surface of the Earth.

a map of coastal areas

Geographic Information Systems (GIS)

GIS describes a wide variety of computer-aided tools and services that capture, store, check, and display information related to positions on Earth’s surface.

A Global Positioning System is set up on a benchmark in Shell Beach, Louisiana.

Global Positioning

Global positioning is fundamental to navigation, communication systems, mapping and charting, and much more.

A LIDAR (Light Detection and Ranging) image created with data collected by NOAA's National Geodetic Survey

Remote Sensing

Remote sensing is the science of obtaining information about objects or areas from a distance, typically from aircraft or spacecraft.