基于光譜轉(zhuǎn)換的土壤鹽分反演與動態(tài)分析
[Abstract]:In order to monitor the salinized soil in the Yellow River Delta region for a long time, the study area will have four Landsat-5 TM,EO-1 ALI, from 2000 to 2016. Based on Landsat-8 OLI time series images and Hyperion hyperspectral data, quantitative inversion analysis of soil salinity was carried out. The Hyperion data are resampled to TM,ALI,OLI simulation data according to the spectral response function, and the spectral conversion coefficients between the corresponding bands of TM,ALI and OLI are calculated by numerical regression method, and the TM,ALI images are converted into OLI time series images. Partial least square regression model and multivariate linear regression model were used to establish the prediction relationship between soil spectral and salt parameters, and the optimal prediction model was applied to OLI time series image for salt inversion mapping. The evolution of saline soil was analyzed by superposition method. The results show that the spectral conversion method improves the data consistency between sensors. The correlation coefficient of partial least square regression conductivity (PLSR-EC) model is 0. 700. The inverse result of the model is tested by the 2012 conductivity data, and the correlation coefficient is 0. 690. In the study area, the high salinity soil decreased and transformed to the low salt soil.
【作者單位】: 東南大學(xué)交通學(xué)院;中國科學(xué)院南京地理與湖泊研究所;
【基金】:國家自然科學(xué)基金資助項目(41471352)
【分類號】:O212.1;S156.4
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