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Remote Sens. 2015, 7(2), 1181-1205;

Digital Mapping of Soil Properties Using Multivariate Statistical Analysis and ASTER Data in an Arid Region

Institute of Geography and Spatial Management, Jagiellonian University, Krakow 30-387, Poland
Faculty of Agriculture, Suez Canal University, Ismailia 41522, Egypt
Environmental Remote Sensing and Geoinformatics, Trier University, 54286 Trier, Germany
Author to whom correspondence should be addressed.
Academic Editors: George Petropoulos and Prasad S. Thenkabail
Received: 24 November 2014 / Accepted: 13 January 2015 / Published: 22 January 2015
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Modeling and mapping of soil properties has been identified as key for effective land degradation management and mitigation. The ability to model and map soil properties at sufficient accuracy for a large agriculture area is demonstrated using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) imagery. Soil samples were collected in the El-Tina Plain, Sinai, Egypt, concurrently with the acquisition of ASTER imagery, and measured for soil electrical conductivity (ECe), clay content and soil organic matter (OM). An ASTER image covering the study area was preprocessed, and two predictive models, multivariate adaptive regression splines (MARS) and the partial least squares regression (PLSR), were constructed based on the ASTER spectra. For all three soil properties, the results of MARS models were better than those of the respective PLSR models, with cross-validation estimated R2 of 0.85 and 0.80 for ECe, 0.94 and 0.90 for clay content and 0.79 and 0.73 for OM. Independent validation of ECe, clay content and OM maps with 32 soil samples showed the better performance of the MARS models, with R2 = 0.81, 0.89 and 0.73, respectively, compared to R2 = 0.78, 0.87 and 0.71 for the PLSR models. The results indicated that MARS is a more suitable and superior modeling technique than PLSR for the estimation and mapping of soil salinity (ECe), clay content and OM. The method developed in this paper was found to be reliable and accurate for digital soil mapping in arid and semi-arid environments. View Full-Text
Keywords: digital soil mapping; soil properties; ASTER; PLSR; MARS; Egypt digital soil mapping; soil properties; ASTER; PLSR; MARS; Egypt

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Nawar, S.; Buddenbaum, H.; Hill, J. Digital Mapping of Soil Properties Using Multivariate Statistical Analysis and ASTER Data in an Arid Region. Remote Sens. 2015, 7, 1181-1205.

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