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The USGS's early work involved conducting ground surveys of the west. The 19th-century cartographers used a classic mapping technique called plane-table surveying.
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Despite the drawbacks,plan-table surveying remained the main method of mapping until the 1940s, when new technology arrived.
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In this photograph, a Coast Guardsman prepares to take pictures during a flight.
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the AMNH used Landsat images to finda new site of dinosaur and early mammal fossils in the Gobi Desert.
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the NASA launched the first landsat satellite. The photographs produced from data gathered by landsat 1 and its successors showed earth in way it had never been seen before.
