USE OF AERIAL SURVEYS IN REGION 8, U.S. BUREAU OF PUBLIC ROADS

AERIAL PHOTOGRAPHS ARE USED TO STUDY ROUTE ALTERNATIVES BEFORE FIELD SURVEYS. THE PHOTOGRAPHS ARE USED IN STEREOSCOPIC PAIRS AND IN ASSEMBLIES AS UNCONTROLLED PHOTOGRAPHIC MOSAICS TO DETERMINE EACH ROUTE ALTERNATIVE, AS GOVERNED BY LAND USAGE, DRAINAGE AREAS, SOIL INTERPRETATION, AND LOCATION AND CLASSIFICATION OF SURFACING MATERIAL SITES. THE POSSIBLE ROUTE ALTERNATIVES ARE DRAWN ON THE AERIAL PHOTOGRAPHS IN STEREOSCOPIC CORRESPONDENCE WITH THE GROUND AND USED AS A GUIDE BY THE CHIEF LOCATER ASSIGNED TO THE SURVEY FOR FIELD REVIEW. BY IMAGE IDENTIFICATION, THE LOCATERS CAN FIND AND EVALUATE EACH ROUTE ALTERNATIVE MEETING HORIZONTAL AND VERTICAL ALIGNMENT STANDARDS. AERIAL VERTICAL PHOTOGRAPHS ARE USED TO COMPARE FEASIBLE ROUTE ALTERNATIVES AND TO PREPARE A PRELIMINARY RECONNAISANCE DESIGN FOR COST ANALYSIS OF THE ROUTE ALTERNATIVES THROUGHOUT ANY GIVEN AREA. APPROXIMATELY 3000 MILES OF ALTERNATIVE ROUTE POSSIBILITIES WERE REVIEWED WITHIN THIS REGION BY DIRECT USE OF AERIAL PHOTOGRAPHS. ESSENTIAL SURVEYS WERE MADE AND 123 MILES OF ROAD REALIGNMENT WERE DESIGNED FOR THE U.S. ARMY CORPS OF ENGINEERS WITH THE LIBBY DAM AREA IN MONTANA. TECHNIQUES USED FOR THIS JOB ARE DESCRIBED. THE CONTRACT PROCEDURE FOR AERIAL SURVEY WORK IS DESCRIBED. THE "REFERENCE GUIDE OUTLINE, SPECIFICATIONS FOR AERIAL SURVEYS AND MAPPING BY PHOTOGRAMMETRIC METHODS FOR HIGHWAY, 1958" IS USED IN THE ADMINISTRATION OF ALL CONTRACTS AWARDED FOR AERIAL PHOTOGRAPHY, GROUND CONTROL SURVEYING AND TOPOGRAPHIC MAPPING BY PHOTOGRAMMETRIC METHODS.

Media Info

  • Media Type: Print
  • Pagination: pp 4-6
  • Monograph Title: PHOTOGRAMMETRY AND AERIAL SURVEYS
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00202835
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 21 1970 12:00AM