PRELIMINARY ENGINEERING SOILS MAPS FROM SMALL SCALE AERIAL PHOTOGRAPHY

RESEARCH IS REPORTED ON AN EFFORT TO IMPROVE AND EXPEDITE THE SYSTEM OF COMPILATION OF PRELIMINARY ENGINEERING SOILS MAPS FROM AERIAL PHOTOGRAPHY. THE USE WAS INVESTIGATED OF SMALL SCALE PHOTOGRAPHY AND ENLARGED STEREO MODELS AS DEVELOPED IN A PHOTOGRAMMETRIC PLOTTER. IT WAS NOT FEASIBLE TO USE THE COMMON SCALE PHOTOGRAPHIC COVERAGE IN A PLOTTER BECAUSE THE AREA COVERED BY EACH MAP WAS 300 TO 500 SQUARE MILES. PRELIMINARY ENGINEERING SOILS MAPS OF TWO COUNTIES WERE COMPILED USING THE SMALL SCALE AERIAL PHOTOGRAPHY FLOWN FOR THE ARMY MAP SERVICE. A DOUBLE PROJECTION PLOTTER OF THE KELSH TYPE WAS USED TO PERFORM THE COMPILATION. VARIOUS APPROACHES TO THE INTERPRETATION AND IDENTIFICATION OF THE DESIRED ENGINEERING SOIL GROUPS WERE TRIED AND A METHOD OF APPROACH WAS DEVELOPED. IT IS CONCLUDED THAT THE SMALL-SCALE PHOTOGRAPHY CAN BE USED DIRECTLY FOR THE INTERPRETATION AND DELINEATION OF ENGINEERING SOILS GROUPS EXCEPT IN ISOLATED CASES. USING CERTAIN SUBSIDIARY MATERIALS, MOSTLY FOR CONTROL, THE CONCLUSION WAS THAT THE COMPILATION FROM SMALL- SCALE PHOTOGRAPHY OF THE BOUNDARIES OF THESE SOIL GROUPS ON FINAL MAPS AT A SCALE OF 1:63, 360 COULD BE READILY AND RELIABLY ACCOMPLISHED. THIS METHOD WAS AS RELIABLE AS PREVIOUS METHODS, BUT COULD BE PERFORMED AT A CONSIDERABLE SAVINGS OF TIME AND MONEY. SYSTEMS FOR PERFORMING THE INTERPRETATION, IDENTIFICATION AND COMPILATION WERE RECOMMENDED.

  • Supplemental Notes:
    • No X 8, 99 PP, 11 FIG, 11 REF, 2 APP
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284
  • Authors:
    • Hall, J C
  • Publication Date: 0

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Filing Info

  • Accession Number: 00229084
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 15 2004 2:11AM