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663 drum plotter addition aerial photographs AERIAL TRIANGULATION arithmeticians automatically automation block adjustment breakdowns CalComp 663 drum CalComp 745 plotter capacity cartographers cassette central computer check plots code number consequences correct Data Processing Division databank desk calculator diazo film digital file digital information digital map compilation digital method digital record display screen drafting draftsmen editing program element pointer file errors fair drawing field surveyors Figure floppy disc graphical hard copy hardware Hewlett Packard HRD-1 Laser Display interactive system Laser Display operated Laser Display system Laser Scan Laboratories limited magnetic tape MAIN DEFLECTORS Man-hours manual map sheet mapping process millimetres minicomputer necessary operational period paper tape phase photochromic film photogrammetric instruments photogrammetric mapping photogrammetric models PLOTTAPE point symbols possible preparation preprocess problems procedure production purchased Refresh Mode speed stereoplotters subroutines Survey Department syntax check Tektronix 4014 terrain types of maps writing system ZEBRA computer