MIRAVI, short for MERIS Images RApid VIsualisation, tracks Envisat around the globe, generates images from the raw data collected by Envisat’s optical instrument, MERIS, and provides them online within two hours. MIRAVI is free and requires no registration.
"ESA designed MIRAVI so that the public could have access to daily views of Earth. Naturally, scientists are already familiar with these data, but we thought these images would be interesting to everyone. Seeing the most recently acquired images of the planet will allow people to witness the magnificent beauty of Earth and become more knowledgeable about the environment," ESA’s Director of Earth Observation Programmes Volker Liebig said.
To enjoy the service, simply visit the MIRAVI website - http://www.esa.int/miravi - and either browse the very latest images by clicking on the snapshots to the left, or view a specific location by either selecting an area on the world map or entering its geographic coordinates. MIRAVI also provides archived images since May 2006, searchable by date.
Although the images are fascinating and provide the marvellous feeling that users are ‘onboard the satellite’, they are not suitable for scientific use. Scientists use MERIS products that exploit the instrument’s 15 spectral bands and are generated with sophisticated algorithms. MIRAVI images use only a few spectral bands processed to appear the way the naked eye would see them.
ESA’s Envisat Mission Manager Henri Laur said: "The Envisat mission is a great success for Europe as a major source of information on the Earth system, including insights into factors contributing to climate change. Since its launch in 2002, Envisat continuously monitors the Earth's land, atmosphere, oceans and ice caps, thanks to its ten sophisticated instruments."
Envisat circles the Earth in a polar orbit at an 800-km altitude, allowing MERIS to acquire global coverage every three days. MERIS measures the solar radiation reflected by the Earth, which means the sun must be present for MERIS to produce an image. Because the sun is low over Nordic areas during winter, images of Scandinavia, for example, are not currently available, except through the archive. The situation will reverse, however, from March onwards, and images of the area will be acquired daily. In contrast, Antarctica is visible for the next two months.
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Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
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Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
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Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
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