Bird's eye view of the Bay area

To kick off this 40th anniversary gallery of images collected over the decades from NASA's Earth observation program, we might as well start with a Landsat shot that appeals to the narcissistic side of many CNET readers -- this is a view of the San Francisco Bay Area as of 2011.
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Photo by: NASA/GSFC / Caption by:

Mauritania's Richat Structure

As part of Landsat's 40th birthday celebration, NASA and the USGS have highlighted a handful of "earth as art" images. This one is a shot of the Richat Structure in the African country of Mauritania. It formed when a volcanic dome hardened and gradually eroded, exposing the dramatic rock layers.
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Photo by: USGS/EROS / Caption by:

Seeing Saudi Arabia go green

Landsat images from the past 25 years demonstrate how Saudi Arabia has turned its arid lands green through tapping underground aquifers. Healthy vegetation appears bright green while dry vegetation appears orange. Barren soil is a dark pink, and urban areas, like the town of Tubarjal at the top of each image, have a purple hue.
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Photo by: NASA/GSFC / Caption by:

Alaska's Malaspina Glacier

Alaska's Malaspina Glacier as seen from Landsat, another from the "earth as art" collection.
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Photo by: USGS / Caption by:

Bolivian deforestation

These images show the progression -- from left to right -- of agricultural development's encroachment into a tropical forest in Bolivia.
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Photo by: USGS / Caption by:

The Icelandic Tiger

When seen through Landsat's eye in the sky, Iceland's northern coast looks like a fierce tiger's head, right down to the coloration.
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Photo by: USGS / Caption by:

Shrinking Lake Chad

Between the first image on the left of Lake Chad -- taken in 1972 -- and the most recent taken in 2002 on the left, it's possible to see how much persistent drought has shrunken the body of water.
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Photo by: USGS / Caption by:

Real "Starry Night"

Another in the "earth as art" series, phytoplankton swirling in the waters around the Swedish island of Gotland mimic Van Gogh's classic "Starry Night."
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Photo by: USGS / Caption by:

Waldo Canyon Fire

Landsat flew over the recent Waldo Canyon fire near Colorado Springs, showing the charred area in black.
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Photo by: USGS / Caption by:

Super Bowl XLVI

Here's Landsat's view of Lucas Oil Stadium in Indianapolis, shortly before Super Bowl XLVI.
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Photo by: USGS / Caption by:

Suburban Atlanta heat map

Landsat captured these thermal images of suburban Atlanta. Compare with the next slide of urban Atlanta for an illustration of the heat island effect.
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Photo by: NASA / Caption by:

Urban Atlanta's heat island

These thermal images of urban Atlanta show the "heat island" effect, especially when compared with the previous slide of a cooler suburban area just outside the city.
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Photo by: NASA / Caption by:

Las Vegas sprawls out

Landsat 5 spent more than 25 years chronicling the rapid expansion of the Las Vegas metropolitan area.
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Photo by: USGS / Caption by:

Mount St. Helens

This is a 1999 view of Mount St. Helens from Landsat.
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Photo by: USGS / Caption by:

Tsunami invades Japan

Captured shortly after a massive earthquake and tsunami rocked Sendai, Japan, in 2011, this shot from Landsat shows only a portion of the damage and infiltration of the landscape made by the wave and accompanying flood waters.
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Photo by: USGS / Caption by:
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