An astronaut on the International Space Station snapped this striking photo last month of forest land adjacent to the Priest River in northern Idaho. From NASA:

The squares in this landscape checkerboard appear to be the result of forest management. Similar patterns originated in the 1800s, when alternate parcels of land were granted by the U.S. government to railroads such as the Northern Pacific. Many parcels in the Pacific Northwest were later sold off and harvested for timber.

The land shown here is now managed for wildlife and for timber harvesting. The white patches reflect areas with younger, smaller trees, where winter snow cover shows up brightly to the astronauts. Dark green-brown squares are parcels of denser, intact forest. The checkerboard is used as a method of maintaining the sustainability of forested tracts while still enabling a harvest of trees.

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Idaho's massive checkerboard forest seen from the Space Station ... - Boing Boing