AUTOMATIC CONTOUR DIGITIZER

THE AUTOMATIC CONTOUR DIGITIZER IS A SECOND-GENERATION GRAPHIC DATA-PROCESSING SYSTEM DESIGNED ESPECIALLY FOR CONVERTING GRAPHIC MAP ELEVATION DATA, BOTH CONTOUR LINES AND SPOT ELEVATIONS, TO DIGITAL FORM ON MAGNETIC TAPE. ESSENTIALLY, THE SYSTEM CONSISTS OF AN ELECTRO-OPTICAL DRUM SCANNER, AN ELECTRO-STORE AND CATHODE RAY TUBE (CRT) MONITOR WITH AN EDITING, JOYSTICK CONTROLLED, LIGHT SPOT, A REFERENCE LIGHT TABLE, AND A MEDIUM SIZE, HIGH-SPEED COMPUTER. USING THE CRT AND JOYSTICK-CONTROLLED LIGHT SPOT, AN I/0 TYPEWRITER, AND THE REFERENCE MAP SHEET, THE OPERATOR DIRECTS THE SYSTEM OPERATION, EDITS THE DATA, AND ASSIGNS ELEVATIONS TO THE UNTAGGED LINES AND POINTS. UNDER THE DIRECTION OF THE OPERATOR AND EXECUTIVE SOFTWARE, THE SYSTEM AUTOMATICALLY SCANS EACH MAP SECTION, 1 X 1 INCH, 2 X 2 INCH, OR 4 X 4 INCH, AUTOMATICALLY TRACKS EACH LINE, FORMATS THE OUTPUT DATA, KEEPS TRACK OF WHAT HAS BEEN DONE, AND TESTS THE OUTPUT FOR ERRORS. THROUGHOUT THE PROCESS THE REQUIREMENTS FOR ACCURACY, RELIABILITY, AND USABILITY OF THE OUTPUT DATA ARE MAINTAINED. THE EFFICIENT COMBINATION OF THE OPERATOR'S DECISION-MAKING CAPABILITY WITH THE COMPUTER'S HIGH SPEED CAPABILITY ENABLES THE SYSTEM TO DIGITIZE A 24 X 30 INCH SHEET CONTRAINING ABOUT 15,000 LINEAR INCHES OF CONTOUR LINES IN ABOUT EIGHT HOURS. /PE/

  • Supplemental Notes:
    • Vol 34, No 1, PP 75-82, 10 FIG
  • Authors:
    • Shepherd, W H
  • Publication Date: 1968-1

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Filing Info

  • Accession Number: 00202636
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 6 1994 12:00AM