PHOTOGRAPHIC TARGETS FOR MARKERS OF SURVEY CONTROL

BENEFITS OF ACCURACY IN GROUND SURVEYS TO CONTROL AERIAL PHOTOGRAPHS IN MAPPING BY PHOTOGRAMMETRIC METHODS FOR THE PRELIMINARY SURVEY OF HIGHWAYS ARE GREATLY ENHANCED WHEN RELIABLE AND EFFICIENT METHODS ARE EMPLOYED TO UTILIZE SUCH CONTROL. PHOTOGRAPHIC TARGETS OF SYMMETRICAL SHAPE, AND SUITABLE SIZE AND COLOR, WHEN PROPERLY PLACED OVER CONTROL POINTS BEFORE AERIAL PHOTOGRAPHS ARE TAKEN OF THE HIGHWAY ROUTE BAND, NOT ONLY INCREASE THE BENEFITS OF ACCURATE GROUND CONTROL, BUT IMPROVE THE EFFICIENCY AND CERTAINTY WITH WHICH THE CONTROL CAN BE USED WHILE THE MAPS ARE COMPILED. ALSO, USE OF PHOTOGRAPHIC TARGETS IMPLEMENTS AS WELL AS DECREASES THE COST OF STAKING THE HIGHWAY ON THE GROUND IN THE LOCATION SURVEY STAGE. SIMILAR ADVANTAGES ARE GAINED BY THE AVAILABILITY OF TARGETS WHEN SUPPLEMENTAL CONTROL IS BRIDGED PHOTOGRAMMETRICALLY. TYPES OF TARGETS ARE DISCUSSED AND ILLUSTRATED. THE PRINCIPLES OF DESIGNING THEIR SIZE, SHAPE, AND SPACING, AND OF PLACING THEM TO PREVENT OBSCURATION BY TALL TREES AND BUILDINGS ARE PRESENTED. /AUTHOR/

Media Info

  • Monograph Title: Photogrammetry - developments and applications: 1958
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00202708
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 16 1994 12:00AM