Geodetics

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The scientific discipline that deals with the measurement and representation of the earth, its gravitational field and geodynamic phenomena (polar motion, earth tides, and tectonic motion) in three-dimensional, time-varying space.

 

Definition source: National Oceanic and Atmospheric Administration

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A tsunami strikes northeast Japan after the 2011 Tohoku Earthquake, generating waves up to 133 feet high along some areas of the coast.
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Sizing a Tsunami
U.S. Navy officer Jonathan Myers explains to his colleague April Beldo how to use a marine sextant during a demonstration of celestial navigation.
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Where on Earth?
Probes are buried in the ground at different depths to estimate soil moisture content
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Looking for Mud
This artist’s depiction shows the Mars Rover on the surface of Mars. Because of precise information about Earth’s length of day and orientation, NASA was able to directly land the Rover on Mars.
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When a Day is Not a Day
An artistic rendering shows that Earth’s rotation has dragged space-time with it.
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A Snag in Space-Time
A researcher checks the calibration of a ground-mounted Global Positioning System (GPS) station on Mount St. Helens.
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Earth's Crust in Action
Lascar volcano in Chile is the most active volcano in the central Andes, with several eruptions occurring during the 1990s.
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Silent Signals
This map, created using data from the Gravity Recovery and Climate Experiment (GRACE) mission, reveals variations in the Earth's gravity field.
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Matter in Motion: Earth's Changing Gravity