Satellite: Aqua
Date Acquired: 12/20/2009
Resolutions: 250m (reduced)
Bands Used: 1,4,3
Credit: Jesse Allen, NASA’s Earth Observatory

I was looking for satellite images of last weekend’s blizzard and found that today’s MODIS Satellite Image of the Day just so happens to be of the Washington, DC area. MODIS (or Moderate Resolution Imaging Spectroradiometer) is a key instrument aboard the Terra (EOS AM) and Aqua (EOS PM) satellites that documents changes on the surface of the earth. 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 that are used for numerous scientific purposes. You can view these satellite images in real-time and see exactly what has happened on the surface of the earth within the last 48 hours.