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MODIS (or Moderate Resolution Imaging Spectroradiometer)
is a key instrument aboard the Terra
(EOS AM) and Aqua (EOS
PM) satellites. Terra's orbit around the Earth is timed
so that it passes from north to south across the equator in
the morning, while Aqua passes south to north over the equator
in the afternoon. Terra MODIS and Aqua MODIS are viewing the
entire Earth's surface every 1 to 2 days, acquiring data in
36 spectral bands, or groups of wavelengths (see MODIS Technical
Specifications). These data will improve our understanding
of global dynamics and processes occurring on the land, in
the oceans, and in the lower atmosphere. MODIS is playing
a vital role in the development of validated, global, interactive
Earth system models able to predict global change accurately
enough to assist policy makers in making sound decisions concerning
the protection of our environment.
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