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Surface soil moisture (SSM) is a significant variable in various fields of science. This paper aims to analyze and improve a SSM retrieval model to apply it to estimate SSM at the regional scale. Firstly, the model parameters were been analyzed. The rotation angle was transformed into exponential form and the ellipse center horizontal coordinate was decreased for the improved SSM retrieval model....
In light of properties of the GM (1, 1) and the linear regression model, this study established a GM (1, 1)-linear regression prediction model. It is really a good model for China's GDP forecast because it greatly overcomes the defects in the GM (1, 1) and the linear regression model and has a better effect.
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