USE OF AERIAL PHOTOGRAPHY IN REGION 15, U.S. BUREAU OF PUBLIC ROADS

THE CONTRACT AND WORK IS DESCRIBED OF AN AERIAL PHOTOGRAPHY CONTRACTOR ENGAGED FOR TOPOGRAPHIC MAPPING ON A 10-MILE SECTION OF THE NATCHEZ TRACE PARKWAY IN MISSISSIPPI. THIS CONTRACT COST LESS THAN $5000 AND LESS THAN 2 MONTHS WERE REQUIRED TO COMPLETE TOPOGRAPHIC MAPPING OF A ROUTE BAND APPROXIMATELY 2.5 TIMES AS WIDE AS WOULD HAVE BEEN SURVEYED IF THE WORK WERE DONE BY A SURVEY CREW ON THE GROUND. THE COST OF SUCH TOPOGRAPHIC MAPPING, IF DONE BY CONVENTIONAL GROUND SURVEY METHODS, WOULD HAVE BEEN APPROXIMATELY $16,000 AND WOULD HAVE TAKEN FROM 4 TO 5 MONTHS TO COMPLETE. SUCCESSES ACHIEVED IN AERIAL MAPPING ENCOURAGE SERIOUS CONSIDERATION OF THE USE OF AERIAL SURVEYS FOR MEASURING ORIGINAL GROUND CROSS-SECTIONS OF THE CONSTRUCTED HIGHWAY FOR COMPUTATION OF EARTHWORK IN PAYMENT OF CONSTRUCTION CONTRACTORS. A TEST SURVEY IS UNDERWAY TO COMPARE COSTS AND ACCURACY OF GROUND SURVEY AND PHOTOGRAMMETRIC METHODS FOR MEASURING EARTHWORK PAY QUANTITIES ON A 4 MILE MOUNTAIN GRADING PROJECT ON THE FOOTHILLS PARKWAY IN EASTERN TENNESEE. IN THE WASHINGTON, D.C. METROPOLITAN AREA, MOST HIGHWAY SURVEY AREAS HAVE BEEN PHOTOGRAPHED, AND SMALL-SCALE TOPOGRAPHIC MAPS COMPILED FROM PHOTOGRAPHY BY PHOTOGRAMMETRIC METHODS WHICH ARE AVAILABLE FROM OTHER GOVERNMENT AGENCIES. THESE MAPS WITH CONTACT PRINTS AVAILABLE STEREOSCOPIC COVERAGE BY AERIAL PHOTOGRAPHY, ARE UTILIZED BY REGION 15 IN RECONNAISANCE SURVEYS FOR ROUTE DETERMINATION AND COMPARISON PURPOSES. REGION 15 ALSO USES CONTACT PRINTS OF THE AERIAL PHOTOGRAPHY IN CONJUNCTION WITH AVAILABLE TOPOGRAPHIC MAPS TO DETERMINE THE SIZE OF DRAINAGE AREAS FOR THE DESIGN OF DRAINAGE STRUCTURES.

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  • Accession Number: 00202836
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 21 1970 12:00AM