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Application of Density Slicing Techniques to Soil Survey¹

ABSTRACT

A density slicing instrument (ISI Model VP 8 Image Analyser) was used to analyze NASA's RB-57 F 1:60,000 false color film (Kodak 2443) photography of a section of Norman County, northwestern Minnesota. Prints of the density-level slice color-coded display screen were made. Ground truth checking demonstrated that the soil boundaries were more accurately located on the color-coded density maps than on the existing detailed soil maps of the area. The most important factor found to be affecting the interpretation of the color-coded image was the current cultural condition, which necessitated the preliminary grouping of fields of similar cropping system and interpreting each group separately. Separation into four or fewer levels resulted in loss of detail, especially in areas of complex terrain. The ability of the instrument to give a relative quantification of the areas of the separate colors (density levels) was found to offer added advantage in estimating the extent of various types of soil limitations.

¹ Contribution from the Soil Science Dept., Univ. of Minnesota, St. Paul, 55101. Minnesota Agr. Exp. Sta. Scientific Journal Series no. 8750.

² Graduate Student and Professor of Soil Sci., respectively. The senior author's present address is: Dept. of Agronomy, Virginia Polytechnic Inst. and State Univ., Blacksburg, Va. 24061.

Received for publication July 29, 1974. Accepted for publication November 26, 1974.