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Keith Bridge Meredith Westington
By Keith Bridge And Meredith Westington Geographer’s Office h ’ ff NOAA\NOS Office of Coast Survey All Nautical Charts produced by NOAA and its predecessors All Nautical Charts produced by NOAA and its predecessors Civil War maps p Nautical charts Bathymetric maps Ci City plans l Aeronautical Charts Aeronautical Charts City plans City plans Sketches Years: 1807 to Yesterday Years: 1807 to Yesterday 99.9% Images are Maps/Charts 99.9% Images are Maps/Charts Images Available: 38,540 79% are Nautical Charts • Corner Points not Displayed p y • Geo‐Extents of a Series could Shift • Consistency in Latitude and d d Longitude ‐77° 6’ 00’’ 33 ° 36’ 00’’ Paper Method Paper Method Ratio of Distances # Pixels of the Whole # Pixels of the Part # Units of the Whole # Units of the Part The Distance Formula D= (X2‐X1)2+(Y2‐Y1)2 (X1,YY1) D (X2,YY2) Digital Method Digital Method D b Database Result Result Result Result Place Name (X,Y) Place Name (X Y) Place Name (X,Y) Place Name (X,Y) Place Name (X,Y) Database Database Result Result Result Result • Outline a method used to make scans into G Geographic Information hi I f ti • 38,000+ Historical Maps and Charts – – – – Free and easily accessible http://www.nauticalcharts.noaa.gov/history Feedback is encouraged! historicalcharts@noaa.gov (Questions) • Thank You • For code questions k ith b id @ keith.bridge@noaa.gov
