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Space | 12. December 2018 | posted by Manfred Gottwald

TanDEM-X image of Hiawatha Glacier

Credit: DLR
TanDEM-X radar amplitude image of the region around Hiawatha Glacier. The apparent texture is due to the surface structure of the ice and its dynamics.

Glaciers abound on Greenland's coastline; fed by the Greenland ice sheet, they flow towards the Arctic Ocean. In the northwest, Hiawatha Glacier is located at 78.8 degrees north, 67 degrees west. It emerges from a semi-circular lobe at the ice sheet margin and forms a narrow tongue with a length of 10 kilometres extending onto the ice-free Inglefield Land. Hiawatha Glacier’s northern neighbour, the large Humboldt Glacier, is much more widely known. The front of the Humboldt Glacier is over 100 kilometres wide where it flows into the Nares Strait. The TanDEM-X image shows the region around Hiawatha Glacier.

Recently, however, Hiawatha Glacier has received worldwide attention. Some years ago, radar measurements performed as part of NASA’s Operation IceBridge, a campaign to monitor changes in the polar ice caps, revealed a circular depression in the ground underneath the ice where Hiawatha Glacier emerges from the ice sheet. Subsequent surveying by an international research team using a more advanced airborne radar system on board the Polar 6 aircraft operated by the Alfred Wegener Institute (AWI) yielded a more detailed view of that bowl-shaped feature. With a diameter of 31 kilometres and a depth of more than 300 metres, it resembles impact craters on Earth or the solid surface of other celestial bodies. read more

Space | 19. October 2016 | posted by Bernadette Jung

How researchers use the latest Earth observation data – Part two

Credit: DLR/NASA GSFC/Lee
Elevation model of the mangrove forest region in the Sundarbans

In the second part of the series on the TerraSAR-X and TanDEM-X Science Meeting in Oberpfaffenhofen, we present further applications for satellite data. This time, for example, biomass is determined with the help of 'Earth observers from space'. Up until Thursday, 20 October 2016, international scientists will use the congress to show their research results on satellite-based Earth observation and to exchange ideas.

High above the swamp

Wet, warm and salty – the perfect habitat for mangroves. These tropical trees only feel at home in seawater or the brackish water of rivers. Together with other water-loving plants and shrubs, they can spread across entire forests or swamps. They offer protection against land loss through coastal erosion along seaboards and act as buffers to block storm surges and tsunamis. Around the world, mangrove forests account for an expanse of roughly 150,000 square kilometres. This equates to an enormous quantity of biomass – plant constituents that act as natural carbon reservoirs and that influence the climate. But exactly how much biomass is stored in these forests? And what about the inaccessible areas? read more

Space | 19. October 2016 | posted by Bernadette Jung | 2 Comments

How researchers use the latest Earth observation data - Part one

KIOST inertial DEM
Quelle: DLR/KIOST/NASA GSFC
Elevation model of coastal area

Researchers from across the globe are in Oberpfaffenhofen for the TerraSAR-X and TanDEM-X Science Meeting. For four days, from 17 to 20 October 2016, they have the opportunity to present their results from the data acquired by the two Earth observation satellite missions and exchange information. Here, approximately 200 presentations give an overview of the latest research in satellite-based Earth observation. The radar data are used in various scientific fields, from climate research to geosciences to forestry, infrastructure planning and remote sensing methodology.

Covering the Science Meeting, the Space Blog presents some of the work presented. The short examples provided outline how the data of the German radar satellites support researchers worldwide. read more

Space | 30. July 2013 | posted by Ralph Kahle

Formation swapping - Comic about the TanDEM-X mission

An exciting manoeuvre awaits us. In early August (6–8 August 2013), the two TanDEM-X mission satellites will be reversing their formation. Until now, the TanDEM-X satellite has been circling around its twin, TerraSAR-X, in an anti-clockwise direction; after the reversal, it will circle clockwise. read more

Space | 01. March 2011

Where and how does ice move in the ocean?

TanDEM-X has now begun routine operations, and is working with TerraSAR-X in bistatic mode and recording data for its global digital terrain model. In this post, I look back at an earlier phase of the mission, when this satellite pair orbited the Earth separated by a mere three seconds or 20 kilometres, and each sensor acquired images independently. read more

Space | 19. October 2010 | 1 Comment

Baptism of fire for the satellite formation

Last Thursday, the two German radar satellites of the TanDEM-X formation finally reached their operational orbit configuration, with only a few hundred metres separating them. In this configuration, they act as a unique radar interferometer in space. The next day, on Friday evening, the instruments were switched on, after many careful checks, to acquire the world's first Digital Elevation Model (DEM) data using a free-flying bistatic Synthetic Aperture Radar (SAR) satellite formation. That same night, the jointly acquired data were received and processed by our operational processing chain. read more

Space | 15. October 2010 | posted by Ralph Kahle | 4 Comments

The satellites have 'eye contact'

This is the moment we have been anticipating for a long time; TerraSAR-X and TanDEM-X finally have 'eye contact'. The final manoeuvre to adjust the close formation was performed on 13 October. Now, the two satellites are orbiting at a distance of less than 400 metres from one another. read more