G
Geodesy

Earth observation

The comprehensive Geodetic Information Portal of GGOS

, and June 13, 2022
The comprehensive Geodetic Information Portal of GGOS
Global Geodetic Observing System (GGOS)

The Global Geodetic Observing System (GGOS) of the International Association of Geodesy (IAG) is a collaborative contribution of the global geodesy community to the observation and monitoring of the Earth System. Geodesy is the science of determining the shape of the Earth, its gravity field, and its rotation as functions of time. Essential to reaching this goal are stable and consistent geodetic ...[Read More]

Geodesists on Tour: GNSS measurements in East Africa

and March 23, 2022
Geodesists on Tour: GNSS measurements in East Africa
Installation of site UGN6 at the Queen’s Pavilion (Uganda). Photo Credit: D. Sarah Stamps.

  Africa hosts the world’s most extensive subaerial rift system on Earth known as the East African Rift System (EARS). It stretches over 5000 km from the Red Sea and Gulf of Aden intersection in the north to the Southwest Indian Spreading Ridge south of South Africa. East-West, the EARS spans the eastern border of the Democratic Republic of Congo across to eastern Madagascar over 3000 km. The ...[Read More]

Around the world with Professor Vening Meinesz onboard the submarine K-XVIII: Exploration of the Solid Earth

and November 12, 2021
Around the world with Professor Vening Meinesz onboard the submarine K-XVIII: Exploration of the Solid Earth
Gravimetrical-Geological Map East Indian Archipelago. Photo credit: From the Gravity Expeditions at Sea Vol. 4, F.A. Vening Meinesz.

  On 14th of November 1934, the Dutch travelled to the harbor of Den Helder situated in the north of the Netherlands to catch a glimpse of the departure of Hr. Ms. K-XVII: A submarine of the Royal Dutch Navy setting sail on a trip around the world. Onboard was a unique traveler and with his non-typical height of 2 meters tall, he towered above the average submarine sailor. Professor Vening Me ...[Read More]

A look beneath Earth’s surface: monitoring groundwater from space

August 26, 2021
A look beneath Earth’s surface: monitoring groundwater from space
Credit: Antonio Jordán (distributed via imaggeo.egu.eu)

Groundwater is one of the most important resources of freshwater for ecosystems and mankind. Because of this fundamental role in the Earth’s water and energy cycles, groundwater has been declared as an essential climate variable by GCOS, the Global Climate Observing System. As with other subsurface processes, it is difficult to observe and monitor on a global scale. This is especially true if you ...[Read More]