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Ash clouds over Sakura-Jima

NASA Earth Observatory

The volcano Sakura-Jima on the Japanese Island Kyushu emitted a dense ash cloud. Currently, it is the most active volcano in Japan, erupting several hundred times per year. Normally, these eruptions are fairly small, but sometimes a great eruption can form an ash cloud of 3.8 km in height.


Tacloban Before and After Haiyan

USGS / EROS; Link:

The taifun Haiyan hit the phillipines with wind speed up to 315 km/h, accompanied by a spring flood, on the 8th of November 2013. A water wall, 7.5 m in height, threatened the city of Tacloban which is located less than 5 m above sea level. The satellite image taken by ASTER shows vegetation in red, sealed surfaces in white to silver, soil in brown and water in black. The white spots are clouds.

Crater Lakes

NASA Earth Observatory, Link:

Approximately 290 billion years ago, two big asteroids collided with the Earth. The craters are still visible - to astronauts in the orbit, the lakes inside the craters are popular subjects for photographs. The crater lakes' diameter is 26 resp. 36 kilometres.


Lethal Poison on the Coast of Namibia


This satellite image shows a turquoise hydrogen sulphide cloud offshore Namibia. This cloud developed under oxygen-deficient conditions at the bottom of the sea as a result of the micro bacterial decomposition of organic material. Hydrogen sulphide is lethal when eaten by fishes and other marine creatures, constituting a serious problem for the fishers. Above the turquoise cloud, you can see billows of sand that are being blown from the Namib Desert onto the open sea.


Location: Namibia
Picture taken on June 17, 2010
Sensor: Terra MODIS

Calving Glacier in Greenland

USGS; Link:

In this image you can see a glacier (blue) in Greenland calving into the sea (black). The glacier is surrounded by landmass, indicated by the red colour in the upper and the lower part of the picture. In recent years, hardly any place on earth has been more affected by climate warming than the Arctic: The ice along the edge of the giant ice cap is getting thinner and thinner, and glaciers are calving more and more rapidly. It remains to be seen if increasing snowfalls on the inner landmass can make up for the loss of frozen material at the edge of the ice cap.


Artificial Islands in Qatar

NASA/JSC; ISS Crew Earth Observations; Link:

This digital camera image was taken at the international space station ISS and shows Doha, the capital city of the state of Qatar in the Persian Gulf. Ring roads surrounding the centre give an idea of the gradual extension of the city starting from the historical city centre.

Land Reclamation at Yellow River

USGS; Link:

The Huang He (or Yellow River) in China is the river with the highest amount of sediment worldwide. Over time, fortified settlements and industrial facilities have been built on sediment that had been deposited in the river delta. In the middle of the nineteenth century, dams and levees were set up in order to protect the new infrastructure against floods. Since the 1970s, the river levels in the delta have been falling continually due to the increased demand for water. These two satellite images give you an idea of the modifications the delta underwent within twenty years.


Floods in Bangladesh


Bangladesh ranks among the most populous states worldwide. Located in the estuary area of Brahmaputra, Meghna and Ganges, the land surface of Bangladesh is just above the sea level. As a result of global change, the population will have to face more and more risks from different directions:  Strongly increasing extreme runoffs might cause floods coming from the north, and due to the current sea level rise, water from the south is getting closer and closer. This satellite image shows the 2004 flooding of Bangladesh – an all too realistic scenario.


High Speed Test Track in Italy


In this satellite image, you can see the circular shape of the high speed test track Pista di Nardò, located next to the town of Nardò in South Italy. Due to its banked lanes, vehicles can pick up speeds of up to 500 km/h on a 12,6 km lane. Since the track was built in 1970, car companies and racing drivers have been using it for test runs. If you are driving at a speed of about 320 km/h, you feel like you are driving in a straight lane.


Location: Nardò, Italy
Picture taken on August 17, 2007
Sensor: Terra ASTER
Band combination: R/G/B