RELATIONSHIPS IN CONTOUR INTERVAL, SCALES, AND INSTRUMENT USAGE

MAP SPECIFICATIONS SHOULD RESULT IN AN ECONOMICAL & EFFIC- IENT BALANCE BETWEEN MAP SCALE AND CONTOUR INTERVAL AND THE PHOTOGRAMMETRIC INSTRUMENT FOR LARGE-SCALE PRELIMINARY SURVEY MAPPING. THE CONSIDERATIONS WHICH MUST BE MADE IN WRITING SPECIFICATIONS TO OBTAIN THIS BALANCE ARE THE FOCAL LENGTH OF THE AERIAL CAMERA AND PHOTOGRAMMETRIC INSTRUMENT, THE OPTIMUM NUMBER OF TIMES THE MAP MANUSCRIPT SCALE MAY BE LARGER THAN THE SCALE OF THE AERIAL PHOTOGRAPHS, AND THE C- FACTOR CUSTOMARILY EMPLOYED FOR THE INSTRUMENT. THE FLIGHT HEIGHT FOR PHOTOGRAPHY WILL BE GOVERNED BY EITHER THE INSTRUMENT C-FACTOR OR ENLARGEMENT RATIO WHENEVER THE SPECIFIED CONTOUR INTERVAL AND MAP SCALE ARE NOT IN BALANCE. TABLES PRESENT MAP SPECIFICATION FOR VARIOUS SCALES AND CONTOUR INTERVALS. IT IS EMPHASIZED THAT LACK OF PROPER BALANCE BETWEEN MAP SCALE AND CONTOUR INTERVAL SPECIFICATIONS WILL RESULT IN INEFFICIENT USE OF PHOTOGRAMMETRIC PLOTTING INSTRUMENTS.

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Filing Info

  • Accession Number: 00202757
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jul 28 1994 12:00AM