EVALUATION OF PHOTOGRAMMETRIC CROSS SECTIONS FOR EARTHWORK PAYMENT

EARTHWORK QUANTITIES WERE COMPARED ON FOUR PROJECTS BY USING BOTH PHOTOGRAMMETRIC FINAL CROSS SECTIONS AND CONVENTIONAL FIELD-MEASURED FINAL CROSS SECTIONS. ORIGINAL CROSS SECTIONS HAD BEEN TAKEN BY CONVENTIONAL FIELD PROCEDURES. ON ONE PROJECT, ELEVATIONS WERE ALSO COMPARED. IT MUST BE RECOGNIZED THAT ANY SYSTEM OF CROSS SECTIONING (FIELD OR PHOTOGRAMMETRIC) USED TO OBTAIN EARTHWORK QUANTITIES IS AN APPROXIMATION. THEREFORE, THE COMPARISON MADE HERE IS A COMPARISON BETWEEN TWO APPROXIMATIONS. IT WAS FOUND THAT FOR DUAL ROADWAY SECTIONS INVOLVING 7,500 CU YD OR MORE PER STATION THE DIFFERENCE BETWEEN PHOTOGRAMMETRIC AND FIELD-MEASURED YARDAGE WAS 2 PERCENT OR LESS. ON THOSE ROADWAY SECTIONS INVOLVING 12,000 CU YD OR MORE PER STATION, THE DIFFERENCE WAS LESS THAN 1 PERCENT. IN ALL CASES THE PHOTOGRAMMETRIC YARDAGE WAS GREATER THAN THE FIELD-MEASURED YARDAGE. WHEN INTERPOLATED PHOTOGRAMMETRIC ELEVATIONS WERE COMPARED TO FIELD ELEVATIONS, IT WAS OBSERVED THAT THE AVERAGE MEAN DIFFERENCE SHOWED THE PHOTOGRAMMETRIC TO BE 0.15 FT. LOWER THAN THE FIELD. IT WAS CONCLUDED THAT THE DIFFERENCE IN EARTHWORK QUANTITIES WAS WITHIN THE RANGE OF POSSIBLE ERROR BECAUSE OF THE AVERAGE AND AREA METHOD OF COMPUTATION, AND THERFORE THE PHOTOGRAMMETRIC METHOD WILL PRODUCE AN ACCURATE ESTIMATE USABLE FOR PAYMENT. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: p. 1-7
  • Monograph Title: Aerial surveys and photogrammetry
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00202965
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 5 1972 12:00AM