Geodesy is the Earth science devoted to determining the size, shape, gravitational field, and orientation in space of the Earth, as well as their temporal variations, with rigorous mathematical and physical models. It integrates terrestrial and space-based observation techniques—such as GNSS (Global Navigation Satellite Systems), satellite gravimetry, satellite altimetry, VLBI (Very Long Baseline Interferometry), and SLR (Satellite Laser Ranging)—to establish global and regional reference frames, geoid models, and precise positioning systems. Geodesy underpins high-precision navigation, monitoring of crustal deformation, sea-level change, and mass redistribution in the Earth system, providing fundamental parameters for geophysics, oceanography, and climate research.
The rise in global mean sea level (GMSL) is a critical indicator of climate change. Hong Kong Polytechnic University (PolyU) researchers have utilized advanced space geodetic technologies to deliver the first precise 30-year ...
Earth Sciences
Sep 1, 2025
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A new artificial intelligence tool developed by researchers at the University of Hawai'i (UH) at Mānoa is making it easier for scientists to explore complex geoscience data—from tracking sea levels on Earth to analyzing atmospheric ...
Planetary Sciences
Aug 12, 2025
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NASA and India paired up to launch an Earth-mapping satellite on Wednesday capable of tracking even the slightest shifts in land and ice.
Space Exploration
Jul 30, 2025
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The scientists who precisely measure the position of Earth are in a bit of trouble. Their measurements are essential for the satellites we use for navigation, communication and Earth observation every day.
Astronomy
Jun 30, 2025
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NASA is collaborating with the Alaska Satellite Facility in Fairbanks to create a powerful, web-based tool that will show the movement of land across North America down to less than an inch. The online portal and its underlying ...
Planetary Sciences
Jun 9, 2025
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This mission will pave the way for groundbreaking observations of everything from petroleum reserves to global supplies of fresh water.
Planetary Sciences
Apr 16, 2025
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A team of Earth scientists affiliated with Peking University and the Southern University of Science and Technology, both in China, and a researcher from the University of Southern California, in the U.S., have found that ...
Useable data is one of the most valuable tools scientists can have. The more data sources they have, the better they can make statements about their research topic. For a long time, researchers in the field of navigation ...
Planetary Sciences
Mar 7, 2025
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When NASA and the Indian Space Research Organization's (ISRO) new Earth satellite NISAR (NASA-ISRO Synthetic Aperture Radar) launches in coming months, it will capture images of Earth's surface so detailed they will show ...
Planetary Sciences
Jan 21, 2025
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40
Aggregated measurements from millions of smartphones could be used to create a comprehensive map of the Earth's ionosphere, leading to better global positioning systems, according to a new paper published in Nature.
Planetary Sciences
Nov 14, 2024
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