1. The Science of Surveying by Mrs. Leone

2. 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

3. Surveying Washington, D.C. 1791-1792 Chief Surveyor: Major Andrew Ellicott, age 37 (here at age 45) Surveyors: Benjamin Ellicott Joseph Ellicott, age 31 (as an older man) Isaac Briggs George Fenwick Benjamin Banneker, age 60 (here at age 64)

4. 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

5. Surveying Washington, D.C. An area containing the full 100 square miles (260 km 2 ) 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.

6. The Original Map of DC Check it out! It was measured in “poles”! 1 pole = 16.5 feet 1 mile = 320 poles

7. 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.

8. 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