AIRPHOTO INTERPRETATION

A MOST IMPORTANT METHOD USED IN THE RECOGNITION AND CLASSIFICATION OF LANDSLIDES IS AIRPHOTO INTERPRETATION. AERIAL PHOTOGRAPHS PRESENT A COMPLETE MAP, AS WELL AS A 3- DIMENSIONAL MODEL OF THE AREA COVERED. WHEN PROPERLY INTER- PRETED, THEY REVEAL NOT ONLY THE TOPOGRAPHY, BUT ALSO CON- SIDERABLE INFORMATION CONCERNING SOIL, GEOLOGY, AND OTHER NATURAL, AS WELL AS MANMADE, FEATURES. THE ADVANTAGES OF USING AIR PHOTOS IN THE INVESTIGATION OF LANDSLIDES ARE SUMMARIZED AS: (1) AIRPHOTOS PRESENT AN OVER-ALL PERSPEC- TIVE OF A LARGE AREA, (2) BOUNDARIES OF EXISTING SLIDES CAN BE READILY DELINEATED ON AIRPHOTOS, (3) SURFACE AND NEAR- SURFACE DRAINAGE CHANNELS CAN BE TRACED, (4) IMPORTANT RELA- TIONSHIPS IN DRAINAGE, TOPOGRAPHY, AND OTHER NATURAL AND MANMADE ELEMENTS THAT SELDOM ARE CORRELATED PROPERLY ON THE GROUND BECOME OBVIOUS IN AIRPHOTOS, (5) A MODERATE VEGETA- TIVE COVER SELDOM BLANKETS DETAILS TO THE PHOTO INTERPRETER AS IT DOES TO THE GROUND OBSERVER, (6) SOIL AND ROCK FORMA- TIONS CAN BE SEEN AND EVALUATED IN THEIR UNDISTURBED STATE, (7) CONTINUITY OR REPETITION OF FEATURES ARE EMPHASIZED, (8) ROUTES FOR FIELD INVESTIGATIONS AND PROGRAMS FOR SURFACE AND SUBSURFACE EXPLORATION CAN BE EFFECTIVELY PLANNED, (9) RECENT PHOTOGRAPHS CAN BE COMPARED WITH OLD ONES TO EXAMINE THE PROGRESSIVE DEVELOPMENT OF SLIDES, (10) AIRPHOTOS CAN BE STUDIED AT ANY TIME, IN ANY PLACE, AND BY ANY PERSON, AND (11) THROUGH AIRPHOTOS, INFORMATION ABOUT SLIDES CAN BE TRANSMITTED TO OTHERS WITH A MINIMUM OF AMBIGUOUS DESCRIP- TION. A STEP-BYSTEP PROCEDURE FOR LANDSLIDE INVESTIGATION BY AIRPHOTOS IS OUTLINED: (1) LAYOUT LOCATIONS OF ROAD OR OTHER PLANNED STRUCTURE ON PHOTOS, (2) TAKE A QUICK SURVEY OF ALL CLIFFS OR BANKS ADJACENT TO RIVER BEND, AND ALL STEEP SLOPES IN THE PHOTO AREA, (3) MARK AREAS ALONG THE RIGHT- OF-WAY THAT SHOW CONSISTENT CHARACTERISTICS OF TOPOGRAPHY, DRAINAGE, AND OTHER NATURAL ELEMENTS WITHIN THE SAME UNIT, (4) EVALUATE THE GENERAL LANDSLIDE POTENTIAL OF THE AREAS, WITH THE HELP OF A GIVEN TABLE, (5) MAKE A DETAILED STUDY OF ALL CLIFFS OR BANKS THAT ARE ADJACENT TO RIVER BENDS AND ALL STEEP SLOPES ABOVE AND BELOW THE CENTER LINE OF THE ROAD, (6) GROUND CHECK SOME OF THE LANDSLIDES THAT ARE RECOGNIZED IN AIRPHOTOS, AND (7) GROUND CHECK ALL SUSPECTED SPOTS, USING METHOD AND CRITERIA DESCRIBED PREVIOUSLY.

  • Record URL:
  • Supplemental Notes:
    • 13 FIG, 1 TAB, 4 REF Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
  • Authors:
    • Liang, T
    • Belcher, D J
  • Publication Date: 1958

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00229818
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 17 2001 12:00AM