Photo-interpretation of land facets as a soil mapping techniqueDie photointerpretation von landschaftsfliesen als methode der bodenkartierungPhoto-interprétation de land facets /3- une technique de cartographie de sol |
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| Authors: | Olusegun Areola |
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| Institution: | Dr. Olusegun O. Areola, Department of Geography, University of Ibadan, Nigeria |
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| Abstract: | In Montgomeryshire, Wales, UK, a study was carried out to test the validity of a soil mapping technique based on the photo-interpretation of land facets. Land facets were used as the means for extrapolating, using aerial photographs, soil properties between widely separated parts of the county. Statistical techniques such as coefficient of variation, analysis of variance and discriminant analysis, were used in testing the validity of land unit classifications of the terrain and of the predictions of soil-land attributes from aerial photographs.The results show that the land facets are uniform soil areas with a considerable degree of homogeneity in those soil properties which are genetically and morphologically important, such as particle size distribution, colour, stòne content, pH and free iron oxide. The facets are, however, highly variable notably in the distribution of exchangeable cations and organic carbon. The similarity between analogous facets based on individual soil parameters is not very great and there are significant differences within groups related to ground drainage and parent material lithology. When all parameters are considered simultaneously, however, the similarity between them is proven. |
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