U.S. Coast Survey, Register No. 338; Sketch showing the relative position of Fort Point & Alcatraz Island, the sites of Lighthouses for the Entrance to San Francisco Bay
San Francisco Bay, Lime Rocks, Fort Point, Alcatraz Island
Survey; Map;
Scanner - Contex SD3600 series and Contex HD5450 Plus Large Format A2 series. Software - Nextimage and Adobe Photoshop CS4. Maps smaller than/or equal 14 inches on the long side scanned at 1200 dpi; maps 15-39 inches scanned at 600 dpi; 40 inches or larger scanned at 400 dpi. Bit depth 8; TIFF.
