Fine Scale Soil Texture Estimation Using Soil Maps and Profile Descriptions
Soil scientists have often to face problems of accurate data scarcity. More than the amount of available data, limitations may occur from the estimation algorithms that are used. Classical methods like Simple Kriging (SK) are not able to take into account the soft information provided by a soil map without making approximations. An example of such approximation would be to take as hard value the middle of the intervals derived from the texture class, yielding very poor results. In this paper, the advantages of using a new approach called the Bayesian Maximum Entropy (BME) are investigated. In order to take into account the complex definition of the texture classes that are intimately linked to the soil mapping context, a modification of the method (called BMF/MC) has been implemented. Based on a realistic simulated example and using standard statistical criteria (e.g., ME, RMSE, spatial correlation of the errors, etc.), BMFJMC is found to be the most efficient method compared to SK, SKMI and BME in the soil texture estimation context.
KeywordsClay Entropy Covariance Stratification Silt
Unable to display preview. Download preview PDF.
- Bogaert P. and D’Or D. Generating sets of three values under summation constraint. 2000 (In preparation).Google Scholar
- Christakos G. Random fields models in earth sciences. Academic Press, San Diego, CA. 1992.Google Scholar
- Christakos G. While God is raining brains, are we holding umbrellas? The role of modem geostatistics in spatiotemporal analysis and mapping. Keynote Speaker, International Conference on Time-Space Systems in Environmental Sciences, Ischia, Italy, October 5–9, 1998a.Google Scholar
- Christakos G. Modem Sparioremporal Geosuuistics. Oxford Univ. Press. New York. N.Y. 2000.Google Scholar
- Legros J.P. Cartographic des sols; de l’analyse spatiale à la gestion des territoires (in french). Presses polytechniques et universitaires romandes. 321 pp. 1996Google Scholar