Image Classification and Land Cover Mapping Using Sentinel-2 Imagery: Optimization of SVM Parameters

Saleh Yousefi, Somayeh Mirzaee, Hussein Almohamad, Ahmed Abdullah Al Dughairi, Christopher Gomez, Narges Siamian, Mona Alrasheedi and Hazem Ghassan Abdo
Additional contact information
Saleh Yousefi: Agricultural and Natural Resources Research and Education Center, Soil Conservation and Watershed Management Research Department, Chaharmahal and Bakhtiari AREEO, Shahrekord 8814843114, Iran
Somayeh Mirzaee: Department of Natural Resources, Shahrekord University, Shahrekord 8818634141, Iran
Hussein Almohamad: Department of Geography, College of Arabic Language and Social Studies, Qassim University, Burayda 51452, Saudi Arabia
Ahmed Abdullah Al Dughairi: Department of Geography, College of Arabic Language and Social Studies, Qassim University, Burayda 51452, Saudi Arabia
Christopher Gomez: LofHazs Laboratory (Sabo), Graduate School of Oceaonology, Kobe University, Kobe 657-8501, Japan
Narges Siamian: Environment, Science and Research Branch, Islamic Azad University, Tehran 1477893855, Iran
Mona Alrasheedi: Department of Geography, College of Arabic Language and Social Studies, Qassim University, Burayda 51452, Saudi Arabia
Hazem Ghassan Abdo: Geography Department, Faculty of Arts and Humanities, University of Tartous, Tartous P.O. Box 2147, Syria

Land, 2022, vol. 11, issue 7, 1-14

Abstract: Land use/cover (LU/LC) classification provides proxies of the natural and social processes related to urban development, providing stakeholders with crucial information. Remotely sensed images combined with supervised classification are common to define land use, but high-performance classifiers remain difficult to achieve, due to the presence of model hyperparameters. Conventional approaches rely on manual adjustment, which is time consuming and often unsatisfying. Therefore, the goal of this study has been to optimize the parameters of the support vector machine (SVM) algorithm for the generation of land use/cover maps from Sentinel-2 satellite imagery in selected humid and arid (three study sites each) climatic regions of Iran. For supervised SVM classification, we optimized two important parameters (gamma in kernel function and penalty parameter) of the LU/LC classification. Using the radial basis function (RBF) of the SVM classification method, we examined seven values for both parameters ranging from 0.001 to 1000. For both climate types, the penalty parameters (PP) showed a direct relationship with overall accuracy (OA). Statistical results confirmed that in humid study regions, LU/LC maps produced with a penalty parameter >100 were more accurate. However, for regions with arid climates, LU/LC maps with a penalty parameter >0.1 were more accurate. Mapping accuracy for both climate types was sensitive to the penalty parameter. In contrast, variations of the gamma values in the kernel function had no effect on the accuracy of the LU/LC maps in either of the climate zones. These new findings on SVM image classification are directly applicable to LU/LC for planning and environmental and natural resource management.

Keywords: machine learning; support vector machine; penalty parameter; land cover mapping; Sentinel-2 (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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