DESCRIPTION: Small coastal survey chart of Florida from Bonsecour Bay to the east end of Santa Rosa Island. Includes Pensacola Bay, Escambia Bay, Garcon Point, Blackwater River, Perdido Beach, Mast Bay, Forster's Island, and Fort Pickens. Price includes hand coloring.
Chart shows the triangulation network employed in an early survey conducted by the U.S. Coast [and Geodetic] Survey in 1849. Changes in topography inland are indicated by hachuring.
In surveying, triangulation is the process of determining the location of a point by measuring only angles to it from known points at either end of a fixed baseline. The point can then be fixed as the third point of a triangle with one known side and two known angles. Surveying error is minimized if first a mesh of triangles is created at the largest appropriate scale. Then points inside the triangles can all then be accurately located with reference to the triangulation network.
PUBLICATION DATE: 1849
GEOGRAPHIC AREA: United States
BODY OF WATER: Gulf of Mexico
CONDITION: Very Good
One small repair in the margin only not near the image.
COLORING: None
ENGRAVER:
SIZE: 7
" x
7 "
ITEM PHYSICAL LOCATION: 11
PRICE: $120
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