LOCATING AND MAPPING GRANULAR CONSTRUCTION MATERIALS FROM AERIAL PHOTOGRAPHS

DATA COVERING TEN YEARS OF MAPPING GRANULAR CONSTRUCTION MATERIALS FROM AERIAL PHOTOGRAPHS WERE SUMMARIZED. DURING THIS PERIOD 2,165 GRANULAR-MATERIAL PROSPECTS WERE MAPPED. INDIVIDUAL DEPOSITS, MAPPED FROM THE PHOTOS AND CHECKED ON THE GROUND, RANGE IN QUALITY FROM DIRTY GRAVELLY SAND TO CLEAN COARSE GRAVEL AND IN QUANTITY FROM A FEW HUNDRED TO SEVERAL HUNDRED THOUSAND CU YD. DATA FROM 75 CONSTRUCTION PROJECTS COVERING 32,000 SQ MI OF SEARCH AREA INDICATE THAT AIRPHOTO INTERPRETATION TECHNIQUES YIELD REMARKABLY GOOD RESULTS WHEN THE INTERPRETATION IS CARRIED OUT BY EXPERIENCED PHOTOANALYSTS FAMILIAR WITH AIRPHOTO PATTERNS OF GRANULAR DEPOSITS IN THE REGION BEING SEARCHED. AS A PROSPECTING TOOL, THE AIRPHOTO TECHNIQUE IS FAST AND ECONOMICAL. RESULTS FROM TEN YEARS AIRPHOTO MAPPING SHOW THAT THE AREAL EXTENT AND QUALITY OF DEPOSITS CAN BE RELIABLY PREDICTED IN A HIGH PROPORTION OF CASES. THE METHOD PARTICULARLY AIDS FOLLOW-UP SUBSURFACE INVESTIGATIONS BY PIN-POINTING WHERE TO EXPLORE IN THE FIELD, AT THE SAME TIME INDICATING WHAT TO EXPECT IN TERMS OF MATERIAL QUALITY AND QUANTITY. THE NEED TO DISCOVER GRANULAR CONSTRUCTION MATERIALS IS POINTED OUT. PERTINENT DATA FROM CONSTRUCTION PROJECTS ON WHICH GRANULAR AIRPHOTO SEARCHES WERE MADE IS PRESENTED. PROSPECTING PROBLEMS FACING THE GROUND- INVESTIGATOR ARE REVIEWED AND A BRIEF DISCUSSION IS MADE OF CUSTOMARY GRANULAR-SEARCH METHODS USED IN LOCATING GRANULAR CONSTRUCTION MATERIALS. A SUMMARY OF THE MORE COMMON GRANULAR LAND FORMS FOUND IN THE PLAINS AREA OF WESTERN CANADA AND THEIR IDENTIFYING FEATURES IN AERIAL PHOTOGRAPHS ARE PRESENTED. IN EACH PROJECT AREA SURVEYED, THE LAND FORM CONTRIBUTING THE GREATEST QUANTITY OF HIGH-QUALITY AGGREGATE IS TABULATED. TABLES AND OTHER STATISTICAL DATA ILLUSTRATE THE FREQUENCY OF OCCURRENCE OF VARIOUS GRANULAR LAND FORMS IN PARTS OF WESTERN CANADA. INFORMATION IS PRESENTED TO INDICATE, FOR DIFFERENT GEOLOGIC ENVIRONMENTS, THE PERCENTAGE OF PHOTO-IDENTIFIED DEPOSITS THAT ARE COMMONLY SUITABLE AS SUBBASE, BASE COURSE, AND WEARING-COURSE MATERIAL. THE ACCURACY OF AIRPHOTO INTERPRETATION PREDICTIONS IS ASSESSED IN TERMS OF THE TRAINING, EXPERIENCE, AND JUDGMENT OF THE PHOTO-INTERPRETER. /AUTHOR/

  • Availability:
  • Supplemental Notes:
    • No 180, pp 20-32, 3 FIG, 1 TAB, 10 REF
  • Authors:
    • Mollard, J D
    • Dishaw, H E
  • Publication Date: 1958

Media Info

  • Monograph Title: Air photo and soil mapping methods: appraisal and application
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00202717
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 30 1994 12:00AM