This paper describes the Lineal Input System (LIS), an interactive multi-computer system which provides a highly cost effective mechanism for generating and maintaining a digital cartographic data base. The need for such a store of error free current cartographic knowledge has been previously identified. A large (32 K words of 18 bit memory) mini computer is slaved in a time shared/multi programmed mode to as many as ten small (8 K words of 16 bit memory) mini computer via parallel 100 kbs serial communications lines. Each small mini computer provides local interactive data manipulation and control functions for a work station which consists of the mini, a core refreshed graphic display, a precision digitizing table and control keyboards. The large mini computer provides common services to all work stations in the form of a data management system and through storage and retrieval of work station program modules and displays. The large mini also provides "batch" program services through a remote job entry capability from the work stations. Cartographic manipulative functions too large for execution in the work station mini computers are necessarily performed in a shared manner with system resources remaining after real-time service to the work station is provided. Output is provided in an earth registered, product independent format on magnetic tape. Precision plots are also available.

  • Supplemental Notes:
    • Presented at the 34th Annual Meeting, St. Louis, Missouri, March 10-15, 1974.
  • Corporate Authors:

    American Congress on Surveying and Mapping

    Woodward Building, Room 430, 733 15th Street, N W
    Washington, DC  United States  20005
  • Authors:
    • McLellan, W G
    • Moritz, B K
  • Publication Date: 1974-3

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00261455
  • Record Type: Publication
  • Report/Paper Numbers: #74-384
  • Files: TRIS
  • Created Date: Oct 22 1974 12:00AM