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Alexander Bache
Alexander Bache, the Coast Survey's second superintendent, peers through a sextant, an instrument used to determine location by measuring angular distances to the stars. |
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Golden Gate Bridge with Cranes
Courtesy 111th Aerial Photography Squadron
With little room to spare, a shipload of cranes passes under San Francisco's Golden Gate Bridge. A nearby tide gauge provides real-time readings to ship captains so they know when it is safe to pass. |
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Katrina Aftermath
NOAA's National Geodetic Survey collected aerial images of Katrina's destruction, providing emergency responders with critical information in affected areas. This image shows shipping vessels stranded in Empire, Louisiana. |
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Taking Measurements
Working under rugged conditions with only basic tools, early Coast Survey teams laid the foundation of knowledge about the nation's coastlines. In this 1921 photo, surveyors in southeast Alaska take coastline measurements. |
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Strawberry Harbor, Straits of Rosario (Detail)
James Madison Alden, 1854
Courtesy Burke Museum of National History and Culture
(catalog number L-3369/2)
Surveyors heave a weighted line to measure the depths of a harbor in this early watercolor. |
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