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Construction of Membership Functions for Soil Mapping using the Partial Dependence of Soil on Environmental Covariates Calculated by Random Forest
Zeng, Canying1,2,3; Yang, Lin4; Zhu, A-Xing1,2,3,4,5
2017-03-01
Source PublicationSOIL SCIENCE SOCIETY OF AMERICA JOURNAL
ISSN0361-5995
Volume81Issue:2Pages:341-353
Corresponding AuthorYang, Lin(yanglin@lreis.ac.cn) ; Zhu, A-Xing(azhu@wisc.edu)
AbstractPartial dependence plots generated by Random Forest (RF) imply an association between soil and environmental variables. This study develops a method to construct membership functions representing knowledge of soil-environment relationships from partial dependence. Key parameters were obtained from normalized partial dependence to define class limits and membership gradation. Seven environmental variables were selected on the basis of the variable's importance within RF. Two cases were conducted to test the effectiveness of our method using different training samples. Case 1 used 33 representative locations as training samples and 50 locations as validations. Case 2 randomly split all 83 samples into training and validation subsets at a proportion of 2: 1; the splits were repeated seven times. For each case, the generated membership functions were used for mapping soil subgroups in Heshan, China, under the Soil Landscape Inference Model framework; RF was conducted for comparison. The results showed that mapping accuracy based on the membership functions (78%) was much higher than that of RF only (60%) in Case 1. In Case 2, the mapping accuracies using membership functions (an average of 67%, SD = 6.5%) were not always higher than those by RF (an average of 67%, SD = 8.0%). The constructed membership functions were impacted by the training samples. Use of representative training samples is recommended when applying the proposed method. However, training samples (including representative samples and other samples) with good coverage in the environmental feature space would allow RF to obtain more accurate soil maps than using representative samples.
DOI10.2136/sssaj2016.06.0195
WOS KeywordFUZZY-LOGIC ; KNOWLEDGE DISCOVERY ; FUNCTION GENERATION ; CLASSIFICATION ; LANDSCAPE ; MODEL ; MAPS
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41471178] ; National Natural Science Foundation of China[41431177] ; National Natural Science Foundation of China[41530749] ; Natural Science Research Program of Jiangsu[14KJA170001] ; National Key Technology Innovation Project for Water Pollution Control and Remediation[2013ZX07103006] ; cultivation project of excellent doctoral dissertations of Nanjing Normal University[YBPY16_006] ; Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) ; Vilas Associate Award from the University of Wisconsin-Madison ; Hammel Faculty Fellow Award from the University of Wisconsin-Madison ; Manasse Chair Professorship from the University of Wisconsin-Madison ; One Thousand Talents Program of China
Funding OrganizationNational Natural Science Foundation of China ; Natural Science Research Program of Jiangsu ; National Key Technology Innovation Project for Water Pollution Control and Remediation ; cultivation project of excellent doctoral dissertations of Nanjing Normal University ; Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) ; Vilas Associate Award from the University of Wisconsin-Madison ; Hammel Faculty Fellow Award from the University of Wisconsin-Madison ; Manasse Chair Professorship from the University of Wisconsin-Madison ; One Thousand Talents Program of China
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000400696900011
PublisherSOIL SCI SOC AMER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/62587
Collection中国科学院地理科学与资源研究所
Corresponding AuthorYang, Lin; Zhu, A-Xing
Affiliation1.Nanjing Normal Univ, Minist Educ, Key Lab Virtual Geog Environm, 1 Wenyuan Rd, Nanjing 210023, Jiangsu, Peoples R China
2.Jiangsu Ctr Collaborat Innovat Geog Informat Reso, 1 Wenyuan Rd, Nanjing 210023, Jiangsu, Peoples R China
3.State Key Lab Cultivat Base Geog Environm Evolut, Nanjing 210023, Jiangsu, Peoples R China
4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China
5.Univ Wisconsin, Dept Geog, Madison, WI 53706 USA
Recommended Citation
GB/T 7714
Zeng, Canying,Yang, Lin,Zhu, A-Xing. Construction of Membership Functions for Soil Mapping using the Partial Dependence of Soil on Environmental Covariates Calculated by Random Forest[J]. SOIL SCIENCE SOCIETY OF AMERICA JOURNAL,2017,81(2):341-353.
APA Zeng, Canying,Yang, Lin,&Zhu, A-Xing.(2017).Construction of Membership Functions for Soil Mapping using the Partial Dependence of Soil on Environmental Covariates Calculated by Random Forest.SOIL SCIENCE SOCIETY OF AMERICA JOURNAL,81(2),341-353.
MLA Zeng, Canying,et al."Construction of Membership Functions for Soil Mapping using the Partial Dependence of Soil on Environmental Covariates Calculated by Random Forest".SOIL SCIENCE SOCIETY OF AMERICA JOURNAL 81.2(2017):341-353.
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