變換光譜數(shù)據(jù)對(duì)土壤氮素PLSR模型的影響研究
[Abstract]:Spectral data transformation plays an important role in eliminating background noise and extracting spectral features. It is a necessary step in the process of spectral data analysis. In order to study the effect of spectral transformation treatment on soil nitrogen PLSR model and select the best spectral transformation processing method, 15 typical spectral transformations were carried out for the original spectral data in this paper. By comparing the correlation between different transformation spectra and soil nitrogen, the accurate diagnosis of soil nitrogen was realized by PLSR, and the optimal spectral data transformation method was evaluated synthetically. The results showed that the correlation between the spectral transformation after differential treatment and soil nitrogen could be improved, especially when the formula (T8 T11) and logarithm (T6 T12) were used before differential treatment. Under the condition that the number of factor variables is less, the interpretation quantity of dependent variables reaches 98. Considering the correction of the model, the verification effect and the complexity of the model (the number of the best factor variables of the model), it is concluded that the first order differential transform (T8) of the spectral square root is the best algorithm for soil spectral transformation. The calibration model of soil nitrogen under this condition was shown as R2N 0.985N RMSEC 0.000132FnN 6, and the validation model was R2N 0.9853 RMSEV 0.000162. The results showed that the spectral data transformation based on T8 could realize the spectral estimation of soil nitrogen under this experimental condition. In addition, the first order differential (T9) of the original spectrum, the first order differential of logarithmic and logarithmic inverse (T6T7) and the second order differential of square root and logarithm (T11T12) can be considered as spectral data transformation methods. The results can provide technical reference for soil nitrogen estimation and spectral data preprocessing.
【作者單位】: 山西農(nóng)業(yè)大學(xué)旱作農(nóng)業(yè)工程研究所;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(31371572;31201168) 山西省科學(xué)技術(shù)發(fā)展計(jì)劃項(xiàng)目(201603D221037-3) 山西省歸國(guó)人員重點(diǎn)資助項(xiàng)目(2014-重點(diǎn)4) 山西省科技攻關(guān)項(xiàng)目(20110311038) 山西省青年基金項(xiàng)目(2012021023-5)
【分類號(hào)】:S151.93
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