GIS-based soil-landscape modeling approach to predict spatial distribution of soils in undifferentiated areas of Davao City, Philippines
2024
Olguera, D.T.
Modeling soil-landscape relationship can be a useful tool in predicting spatial distribution of soils in a given landscape. With the aid of GIS technology, it facilitates the application of soil-landscape model to a digital geographic database of appropriate landscape variables to generate a detailed soil map. Geomorphic surface, landsurface catena, and ecogeographical belt were derived as the soil-landscape units or known as formula unit. Within the identified formula units, the occurrence and intensity of the different pedogenic processes were determined. Soil properties were estimated, and soil was classified according to USDA Soil Taxonomy framework. The soil landscape modeling approach eventually comprised of the association of formula units, dominance, and intensity of pedogenic processes, soil properties, and soil classification. Predictive accuracy of the soil-landscape model was assessed by using published soil map as a reference for validation. Since the predictive accuracy of the model reached more than 50%, this was then applied to predict soil distribution in the undifferentiated areas of Davao City. To further validate, nine soil profiles were evaluated, classified, and matched to the soil's name predicted both in the mapped and undifferentiated areas. The validated soil-landscape model was then used to generate an interpretative soil map of Davao City.
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