DETERMINATION OF ACCURACIES IN EARTHWORK QUANTITIES FROM PHOTOGRAMMETRICALLY MADE SURVEYS

CROSS-SECTIONS FROM FOUR CONSTRUCTION PROJECTS WITH VARYING TYPES OF TERRAIN WERE TAKEN BOTH BY FIELD METHODS AND PHOTOGRAMMETRIC METHODS. SELECTED PROFILE ELEVATION DIFFERENCES BETWEEN THE TWO TYPES OF DATA YIELDED NORMAL PERCENTAGE DISTRIBUTION CURVES AND AN AVERAGE DIFFERENCE OF .03 FT BETWEEN THEIR STANDARD DEVIATIONS. THE VOLUMETRIC DIFFERENCE BETWEEN THE TWO TYPES OF CROSS-SECTIONS WAS EXPRESSED IN TERMS OF AN AVERAGE DEPTH SPREAD OVER THE ENTIRE PLANE AREA INVOLVED. THIS DIFFERENCE WAS .03 YD FOR PHOTOGRAMMETRIC DATA. A PROBABLE MAXIMUM VOLUMETRIC ERROR ON A PROPOSED PROJECT CAN BE ESTIMATED BY MULTIPLYING .03 YD BY THE NUMBER OF SQUARE YARDS OF AREA TO BE DISTURBED. VOLUME ERROR EXPRESSED AS A PERCENTAGE OF TOTAL VOLUME WILL BE GREATER FOR PROJECTS WITH LIGHT GRADING. THE HORIZONTAL DIFFERENCE IN PLACEMENT OF CROSS-SECTION POINTS AFFECTED THE VOLUME MORE THAN DIFFERENCES IN ELEVATION. PHOTOGRAMMETRIC DATA IS SUFFICIENTLY ACCURATE FOR DESIGN AND PAY QUANTITIES. /AUTHOR/

  • Supplemental Notes:
    • Rept No 38-IF, 49 PP, 6 FIG, 8 TAB, 1 APP
  • Corporate Authors:

    Texas State Department of Highways & Public Transp

    Automation Division
    Austin, TX  USA  78701
  • Authors:
    • Merrell, R L
  • Publication Date: 1968-5

Subject/Index Terms

Filing Info

  • Accession Number: 00202733
  • Record Type: Publication
  • Files: TRIS, STATEDOT
  • Created Date: Nov 4 1994 12:00AM