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Posts tagged Reunion Island

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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Piton de la Fournaise Volcano, Reunion Island

December 5th, 2008 Category: Volcanoes

Piton de la Fournaise Volcano, Reunion Island - November 26th, 2008

Piton de la Fournaise Volcano, Reunion Island - November 26th, 2008

This radar image is centered upon Réunion Island, a French territory located in the Indian Ocean more than 1,000 km east of Madagascar.

In the lower right quadrant we can see the Piton de la Fournaise (“Peak of the Furnace”) Volcano, a basaltic shield volcano on the eastern side the island.

It is currently one of the most active volcanoes in the world, typically erupting about once a year, with more than 150 recorded eruptions since the 17th century. The most recent eruptions have occured in February, 2007, and on the 21st of September, 2008.

Eruptions within the caldera do not cause much devastation, because the caldera is uninhabited and little infrastructure exists apart from the highway. Lava flows are generally confined to the caldera.

The top part of the volcano is 8,000 feet long 2 feet wide. High cliffs known as remparts form the caldera’s rim. The caldera is breached to the southeast into the sea. The lower slopes are known as the Grand Brûlé (“Great Burnt”).

Most lava eruptions are confined to the caldera, inside of which is a 400 metre high lava shield known as Dolomieu. Atop the lava shield are Bory Crater (Cratère Bory) and Dolomieu Crater (Cratère Dolomieu), which is by far the wider of the two.

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