00202644

Component

http://onlinepubs.trb.org...rbbulletin/354/354-004.pdf

TO USE AERIAL PHOTOGRAPHS AS A SATISFACTORY SURVEYING TOOL AND MAP SUBSTITUTE, IT IS NECESSARY THAT THE PHOTOGRAPHS BE ENLARGED PRECISELY. TO OBTAIN PRECISE PHOTOGRAPHIC ENLARGEMENTS, ADEQUATE TARGETS MUST BE SET ON THE GROUND BEFORE PHOTOGRAPHY, WITHIN THE AREA TO BE PHOTOGRAPHED, TO OBTAIN BOTH AN ENLARGEMENT FACTOR AND SCALING FACTORS. IT HAS BEEN EXPERIENCED IN WORKING WITH AERIAL PHOTOGRAPHS ENLARGED TO A SCALE OF 20 FEET TO 1 INCH THAT THE DETERMINATION OF THE DIMENSIONS OF AREAS, SUCH AS FRONTAGE ROADS, THAT ARE TO BE CONVEYED TO OTHER POLITICAL SUBDIVISIONS SAVES A GREAT DEAL OF OFFICE AND SURVEY TIME. THE RESULTS OBTAINED WERE AS ACCURATE AS THOSE NORMALLY OBTAINED BY CONVENTIONAL SURVEY METHODS ON THE GROUND. PLANIMETRY CAN BE LOCATED WITH SUFFICIENT PRECISION FOR MOST OF THE WORK TO BE ACCEPTABLE. THIS CAN BE DONE AT A LOWER COST, COVERING A GREATER AREA, AND WITH BETTER DETAILED COVERAGE, THAN BY CONVENTIONAL SURVEY METHODS. THE MERIT OF USING SEMI-CONTROLLED AERIAL PHOTOGRAPHS LIES IN THE FACT THAT THE METHOD IS FAST AND INEXPENSIVE, AND HAS ACCEPTABLE ACCURACY AS COMPARED WITH CONVENTIONAL SURVEY METHODS. IN ADDITION, THE NUMBER OF MISTAKES OR ERRORS IS REDUCED AND THESE ERRORS ARE READILY ISOLATED. /AUTHOR/

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.

01410732

pp 51-60

1962

Highway Research Board Bulletin

41st Annual Meeting of the Highway Research Board

Digital/other

Figures (4)

Accuracy; Aerial photography; Data collection; Economics; Mapping; Methodology; Photographs; Photography; Surveying instruments; Surveys

Photographic surveys; Right of way

Design; Economics; Highways

TRIS, TRB, ATRI

Jun 3 1994 12:00AM

• HORIZONTAL CONTROL STAKING BY TRIANGULATION WITH COMPUTATIONS BY COMPUTER
• PREPARATION OF RIGHT-OF-WAY PLANS FROM AERIAL MOSAICS ACQUISITIONS
• REMOTE BASE LINE METHOD OF MEASURING HORIZONTAL AND VERTICAL CONTROL
• USE OF AERIAL ENLARGEMENT TRANSPARENCIES IN RIGHT-OF-WAY ACQUISITION
• Use of Aerial Mosaics and Photogrammetry in Right-of-Way Acquisitions
• USE OF THE ZEISS STEREOTOPE FOR HIGHWAY ENGINEERING PURPOSES