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Tremors Continue in L’Aquila and the Abruzzo Region, Italy – UPDATE

April 8th, 2009 Category: Earthquakes

L'Aquila and the Abruzzo Region, Italy - April 6th, 2009

L'Aquila and the Abruzzo Region, Italy - April 6th, 2009

3D View

Simulated aerial view of Central Italy

The main picture is an orthorectified Radar (ASAR) image of Central Italy, focusing on the city of L’Aquila and the epicenter of the earthquake.

The thumbnail image gives a three dimensional look at the area simulating an aerial view (the Xvid codec, if missing, can be downloaded here).

Fresh aftershocks have rattled earthquake-hit central Italy, killing at least one more person and complicating rescue efforts, reported the BBC. One 5.2-magnitude tremor at 0253 (0053 GMT) on Thursday caused damage to buildings in L’Aquila and several nearby villages. Several of the aftershocks were felt as far away as Rome and Naples.

As the desperate search for survivors continues, officials have raised the death toll from the quake to 279. However, thanks to intense rescue efforts about 150 people have been pulled alive from the rubble.

Another 100 people are reported to be in serious condition and some 28,000 people were made homeless. Thousands spent a second night in tent camps around L’Aquila, the capital of the central Abruzzo region, as temperatures dropped to 4-5C overnight.

Crushed cars, L'Aquila, Italy - source: La Repubblica

Crushed cars, L'Aquila

Collapsed building, L'Aquila, Italy - source: La Repubblica

Collapsed building, L'Aquila

Italy’s Civil Protection Agency noted that tremors were continuing and it was difficult to know when they would end. At least seven strong shocks hit the region during the night, waking people from their sleep in the tent shelters.

Between 3,000 and 10,000 buildings are thought to have been damaged in L’Aquila, making the 13th-Century city of 70,000 uninhabitable for some time.

The head of the Italian Red Cross, Francesco Rocha, said 20,000 people were homeless and it could be months or even years before they were all back in their own homes.

ASAR Image Orthorectification

April 3rd, 2009 Category: Earth Observation

Figure 1 - 3D Model

Figure 1 - 3D Model

These images of Reunion Island provide a clear example of the improvements made through the use of the orthorectification technique.
The original product has been processed, orthorectified and projected using the Chelys SRRS (Satellite Rapid Response System). The orthorectification process is now fully automatic and transparent. The Digital Elevation Model used is the Nasa SRTM v4 (Shuttle Radar Topography Mission).

The proper DEM is selected according to the image resolution: from 15 arcseconds up to 1 arcsecond (only available for USA). The performance of the system are kept in real-time. The entire correction process takes less than 20 seconds per product.

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