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The Science of Surveying
by Mrs. Leone
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Surveying
• The science of plotting maps of a specific locale
• Includes finding its boundaries, calculating its area, and measuring its elevation above sea level
• Uses geometry and trigonometry to measure angles and distances
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Surveying Washington, D.C. • 1791-1792• Chief Surveyor: Major Andrew Ellicott,
age 37 (here at age 45)• Surveyors:
Benjamin EllicottJoseph Ellicott, age 31 (as an older man)Isaac BriggsGeorge FenwickBenjamin Banneker, age 60 (here at age 64)
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Surveying Washington, D.C.
• The survey began at Jones Point, a cape located at the confluence of Hunting Creek and the Potomac River south of Alexandria, VA.
looking south
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Surveying Washington, D.C.
• An area containing the full 100 square miles (260 km2) that the Residence Act had authorized on July 6, 1790
• Each side was 10 miles (16 km) long. • The axes between the corners of the square
ran north–south and east–west.
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The Original Map of DC
Check it out! It was measured in “poles”!1 pole = 16.5 feet1 mile = 320 poles
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Surveying Washington, D.C. • The survey team placed sandstone boundary
markers at or near every mile point along the sides of the square.
• Many of these markers still remain. • The west cornerstone is at the west corner
of Arlington County, Virginia.• The north cornerstone is south of
East-West Highway near Silver Spring, Maryland, west of 16th St.
• The east cornerstone is east of the intersection of Southern Ave and Eastern Ave.
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Surveying Washington, D.C.
• What did D.C. look like before it was D.C.?
• video of Canadian surveyors doing their thing
• old fashioned surveyor’s tools