Before and after images from the Landsat 7 satellite show the after effects of the tsunami that followed the 9.0 earthquake off of Japan's east coast last weekend. A side-by-side comparison reveals inland areas inundated by water from the tsunami, smoke from burning fires and clouds of debris in the water.
Images from February 24, 2011 and March 12, 2011 were created using false coloring to make features more prominent. False color Landsat 7 ETM+ bands 4, 3, and 2 were used to create the images. The Enhanced Thematic Mapper Plus (ETM+) instrument is a fixed "whisk-broom," eight-band, multispectral scanning radiometer capable of providing high-resolution imaging information of the Earth's surface.
In the images from March 12, you can see water on land especially to the north of Sendai. You can also see water rise and/or inundation on the island in front of the Sendai coast. The clouds are prominent in the imagery but the inland water, debris in the ocean and smoke from the fires are still visible in the March 12 image. The black lines in the image are data band gaps.
The Landsat Program is a series of Earth-observing satellite missions jointly managed by NASA and the U.S. Geological Survey. Since 1972, Landsat satellites have collected information about Earth from space. This science, known as remote sensing, has matured with the Landsat Program.
Landsat satellites have taken specialized digital photographs of Earths continents and surrounding coastal regions for over three decades, enabling people to study many aspects of our planet and to evaluate the dynamic changes caused by both natural processes and human practices.
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For more information about Landsat, visit: landsat.gsfc.nasa.gov/ .