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Abstract
Remote sensing has been used as an important means of estimating crop production, especially for the estimation of crop yield in the middle and late growth period. In order to further improve the accuracy of estimating winter wheat yield through remote sensing, this study analyzed the quantitative relationship between satellite remote sensing variables obtained from HJ-CCD images and the winter wheat yield, and used the partial least square (PLS) algorithm to construct and validate the multivariate remote sensing models of estimating the yield. The research showed a close relationship between yield and most remote sensing variables. Significant multiple correlations were also recorded between most remote sensing variables. The optimal principal components numbers of PLS models used to estimate yield were 4. Green normalized difference vegetation index (GNDVI), optimized soil-adjusted vegetation index (OSAVI), normalized difference vegetation index (NDVI) and plant senescence reflectance index (PSRI) were sensitive variables for yield remote sensing estimation. Through model development and model validation evaluation, the yield estimation model’s coefficients of determination (R2) were 0.81 and 0.74 respectively. The root mean square error (RMSE) were 693.9 kg ha−1 and 786.5 kg ha−1. It showed that the PLS algorithm model estimates the yield better than the linear regression (LR) and principal components analysis (PCA) algorithms. The estimation accuracy was improved by more than 20% than the LR algorithm, and was 13% higher than the PCA algorithm. The results could provide an effective way to improve the estimation accuracy of winter wheat yield by remote sensing, and was conducive to large-area application and promotion.
Highlights
And accurately estimating crop yield is of significant importance for formulating plans for social and economic development, determining agricultural products import and export plans, ensuring national food security, guiding and regulating macroscopic planting structure, as well as improving the management skills of relevant agriculture-related enterprises and farmers[1,2,3,4,5,6]
Other researches have suggested that the mars-crop yield forecasting system (M-CYFS) model was more consistent as a predictor of crop yield than meteorological predictors since these predictors summarize the succession of agrometeorological conditions for the yield of the entire growing season[11]
Green normalized difference vegetation index (GNDVI), optimized soil-adjusted vegetation index (OSAVI), normalized difference vegetation index (NDVI) and plant senescence reflectance index (PSRI) were sensitive for remotely estimating the yield
Summary
And accurately estimating crop yield is of significant importance for formulating plans for social and economic development, determining agricultural products import and export plans, ensuring national food security, guiding and regulating macroscopic planting structure, as well as improving the management skills of relevant agriculture-related enterprises and farmers[1,2,3,4,5,6]. The data sources of the earth observation satellites were low spatial resolution MODIS, national oceanic and atmospheric administration (NOAA)/AVHRR images[23,28], medium spatial resolution India remote-sensing satellite (IRS-P6), enhanced thematic mapper (ETM), thematic mapper (TM) images, and high spatial resolution Quickbird, SPOT, IKONOS, ALOS foreign images[29,30,31] These data sources were expensive, which limited their use in small and medium research units and production management departments[32,33].it was of great significance to promote the application of image data obtained by satellites developed by China in remote sensing of agricultural conditions. The objectives of the present study were to investigate the quantitative relationship between the yield and satellite remote sensing variables during flowering period, and developed an effective way to improve the estimation accuracy of winter wheat yield by remote sensing
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