A digital raster graphic shows a topoguad,
which has been scanned and corrected/ georeferenced to the earth’s surface.
These maps are available for public use.
The example map shows a 2012 OLD LYME, CONNECTICUT – 7.5
MINUTE SERIES QUADRANGLE (1:24,000–SCALE) US TOPO
(ORTHOIMAGE LAYER OFF)
Reference URL: http://nationalmap.gov/ustopo/index.html
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