Determination of Soil Characteristics from Thematic Mapper Data of a Cropped Organic-Inorganic Soil Landscape
- Kyoo-seock Lee,
- G. B. Lee and
- E. J. Tyler
Methods of determining soil characteristics from thematic mapper (TM) data were investigated at a site in southern Wisconsin. These methods utilized the soil-sensitive spectral region of TM. Because there was little correlation between soil mapping units (soil phases) and the TM soil spectral classes, the former were grouped by wetness class, as determined from natural soil drainage classes, and by organic matter content. Agreement between wetness class and the April and September classifications, with absolute radiance and raw ratio transformation was 65.1, 61.3, 64.0, and 64.7%. When organic matter content was used instead of wetness class, the agreement ratio with TM was 74.0, 73.9, 68.4, and 66.0%. The April image correlated better with the soil map than the September image. Vegetative cover was a primary reason for difficulty in interpretation. The soil brightness image contributed most to classification accuracy, and can be used for manual soil interpretation. The stretched thermal IR image was also effective in discriminating between mineral soils and Histosols.
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