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Book: Soil Survey Techniques
Published by: Soil Science Society of America



  1.  p. 1-9
    SSSA Special Publication 20.
    Soil Survey Techniques

    W. U. Reybold and G. W. Petersen (ed.)

    ISBN: 978-0-89118-915-2


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Video Image Analysis of Large-scale Vertical Aerial Photography to Facilitate Soil Mapping 1

  1. W. D. Harrison,
  2. M. E. Johnson and
  3. P. F. Biggam
  1. Soil Scientists, Soil Conservation Service, USDA, 304 North 8th Street, Room 345, Boise, ID 83702


Large scale 35-mm aerial photography and video image analysis (VIA) were used to identify and quantify land surface features important to the determination of soil drainage classes in a portion of the Blaine County area soil survey, Idaho. On-ground reconnaissance revealed that changes in present vegetation, presence or absence of surface salts, and variations in surface soil color were key indicators of soil drainage classes and ultimately indicators of soil series and/or soil phases in this area. Large scale (1:4800) 35-mm color positive aerial photos were taken for 18 map unit transects. A photo-to-ground registration verified that changes in present vegetation cover, surface saltiness, and surface color were indicated on the aerial photos. Two VIA methods (polygon-outline and density-slice) were used to interpret and measure the percentage of area of these features from the film. Video image analysis measurements were merged with on-ground data to more accurately determine the spatial extent and composition of soil drainage classes within soil map units. Final map unit design and composition decisions were based on the combined use of VIA derived and on-ground transect data.

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Copyright © 1987. Copyright © 1987 by the Soil Science Society of America, Inc., 5585 Guilford Rd., Madison, WI 53711 USA