00202708

Component

http://onlinepubs.trb.org...rbbulletin/199/199-007.pdf

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/

No 199, pp 49-67, 23 FIG, 3 TAB, 2 REF, 1 APP Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01408187

Higginson, W S

19p

1958

Highway Research Board Bulletin

Digital/other

Accuracy; Aerial surveying; Control; Mapping; Photography

Design; Highways

TRIS, TRB

Sep 16 1994 12:00AM

• 10-FOOT PORTABLE SUBTENSE BAR
• ADJUSTMENT OF STATE PLANE COORDINATES
• AERIAL MAPPING IN AREAS OF HEAVY GROUND COVER
• EARTHWORK DATA PROCUREMENT BY PHOTOGRAMMETRIC METHODS
• PHOTOGRAMMETRIC MAP ACCURACY
• Report of Committee on Photogrammetry and Aerial Surveys
• SURVEY SECURITY THROUGH PHOTOGRAMMETRY