The Mount Rushmore National Memorial, near Keystone, South Dakota, is a monumental granite sculpture by Gutzon Borglum. The monument represents the first 150 years of the history of the United States of America with 60-foot (18 m) sculptures of the heads of former United States presidents (left to right): George Washington, Thomas Jefferson , Theodore Roosevelt, and Abraham Lincoln. The entire memorial covers 1,278.45 acres (5.17 km2) and is 5,725 feet (1,745 m) above sea level...This is a digital combination of an infrared image and a visible color image. The color picture is used to colorize the infrared image giving a foreign and new perspective. Plants and trees reflect more infrared light and appear brighter in images while the sky reflects less making it darker.
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