Soil Texture Classification of Hyperspectral Based on Data Mining Technology
ZHONG Liang,, GUO Xi,, GUO JiaXin, HAN Yi, ZHU Qing, XIONG XingCollege of Land Resources and Environment, Jiangxi Agricultural University/Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province, Nanchang 330045
Abstract 【Objective】 The aim of this study was to find the reflection law of Vis-NIR spectra of different soil texture types in red soil region, and to quickly and accurately predict the soil texture type by the spectrum. 【Method】 Taking the north of Fengxin County in Jiangxi Province as the research area, 245 soil samples were taken as the research objects. Under the 4 groups and 12 levels of international soil texture classification standards, the spectral reflectance of different soil texture types was analyzed first, then the data mining models combining 9 mathematical transformation methods and 5 machine learning algorithms were used to classify the soil texture, and finally analysis of the confusion matrix with the highest modeling accuracy and the triangular coordinate distribution map of prediction results. 【Result】 (1) There were many overlaps and overlaps in the spectral reflectance between different soil textures, and the law between the soil texture and the spectral reflectance was more complicated. (2) Fractional derivative transformation was an extension of the integer derivative, which was helpful for the classification of soil texture, but the original spectral data had more abundant feature information and was more suitable for the classification of soil texture. (3) Both ensemble learning methods and neural network methods were good choices when modeling unbalanced data sets. (4) It was difficult to distinguish the categories near the boundary of soil texture by using the model. Among them, clay loam group was the most likely to be predicted wrongly under the four classification standards, and clay loam and loamy clay were the two most likely to be predicted wrongly under the 12 classification standards. (5) Among the four groups of classification standards, the highest prediction accuracy (at 0.68) was obtained by the combination of normalization treatment and MLP model, and the prediction accuracy of clay loam group could reach 0.84. After subdivision to 12 levels classification, the best classification result came from combination of original data and MLP model, and the classification accuracy of loamy clay was 0.89. 【Conclusion】 The results of this study could provide a reference for soil texture classification by using hyperspectral data. Keywords:red soil region;Vis-NIR spectroscopy;soil texture;classification;data mining technology
PDF (2104KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 钟亮, 郭熙, 国佳欣, 韩逸, 朱青, 熊杏. 基于数据挖掘技术的高光谱土壤质地分类研究[J]. 中国农业科学, 2020, 53(21): 4449-4459 doi:10.3864/j.issn.0578-1752.2020.21.013 ZHONG Liang, GUO Xi, GUO JiaXin, HAN Yi, ZHU Qing, XIONG Xing. Soil Texture Classification of Hyperspectral Based on Data Mining Technology[J]. Scientia Acricultura Sinica, 2020, 53(21): 4449-4459 doi:10.3864/j.issn.0578-1752.2020.21.013
为寻找光谱数据预测土壤质地的最佳数学变换形式,本研究选取了包括原始光谱反射率(R)、归一化(Normalization)、标准化(Standardization)、0.5阶导数(fractional order derivative,FOD(0.5))、1阶导数(FOD(1))、1.5阶导数(FOD(1.5))、2阶导数(FOD(2))、倒数的对数(inverse-log reflectance,ILR)和对数的导数(log-derivative reflectance,LDR)共9种土壤光谱数学变换。这些数学变换有助于突出光谱特征,在一定程度上能够提高建模精度,在土壤光谱研究中已经得到广泛应用。其中分数阶导数变换采用Grünwald-Letnikov算法[43]通过MatlabR2017b编程实现。
Table 2 表2 表29种数据处理和5种模型进行土壤质地4组分类的准确度比较 Table 2Accuracy comparison of four groups of soil texture classification by nine data processing and five models
Table 4 表4 表49种数据处理和5种模型进行土壤质地12级分类的准确度比较 Table 4Accuracy comparison of soil texture classification of twelve levels by nine data processing and five models
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