G
Geodesy

Guest post

Highlights at IAG Scientific Assembly 2025 – What you need to know

August 5, 2025
Highlights at IAG Scientific Assembly 2025 – What you need to know
Rimini (Italy). Photo by Giulia Cavalli (original at https://eventi.unibo.it/iag2025).

It is almost time for the scientific assembly of the International Association of Geodesy (IAG), an association of the International Union of Geodesy and Geophysics (IUGG). The EGU Geodesy Division and the IAG have worked together for many years. For example, the IAG has been the main sponsor of the Geodesy Reception at past EGU General Assemblies. Besides this, the IAG coordinates global geodetic ...[Read More]

Combining GRACE and Kalman filter to get superior evapotranspiration estimates

, and October 25, 2024
Combining GRACE and Kalman filter to get superior evapotranspiration estimates
(source: Getty/Oleh_Slobodeniuk)

Knowledge gaps in our understanding of the Hydrological Cycle  The water cycle continuously provides us with fresh water.  A critical process in the water cycle is evapotranspiration (ET), meaning that water evaporates from the surface and transpires from plants into the atmosphere. ET plays a crucial role in climate stability and the regulation of global water resources, but it is one of the most ...[Read More]

Geotandem: Exploring the subsurface of Mars using geodetic data

, and February 21, 2024
Geotandem: Exploring the subsurface of Mars using geodetic data
Figure courtesy: Emily Hinshaw

Welcome to the first of its kind, the Geotandem 01! A collaborative series between EGU divisions. Interdisciplinarity is intrinsic to Geosciences, so we want to showcase how researchers approach the same topics from different but also complementing perspectives. In each edition, we will bring you a high-interest topic for the community seen from the eyes of diverse disciplines. Today, the Tectonic ...[Read More]

High resolution terrestrial water storage changes from combination of GRACE and models

, and February 7, 2024
High resolution terrestrial water storage changes from combination of GRACE and models
Image credits: Jakob Keck (distributed via imaggeo.egu.eu)

The Gravity Recovery and Climate Experiment (GRACE) satellite mission (2002-2017) consisted of two satellites at ~500 km altitude separated by 200 km, following each other in the same orbit. The distance between the two GRACE satellites changes because of the gravitational pull of the masses beneath the satellites. As such, mass changes at or near the Earth’s surface caused variations in the dista ...[Read More]