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The grain yield time series is a non-steady time series that has the definite dynamic tendency and stronger random fluctuation. Therefore, we first use the grey GM(1, 1) model to obtain the tendency term, and then the generalized trigonometric model is used to catch the periodic phenomenon from the data for improving forecasting accuracy. The grey model with the trigonometric residual modification...
Land use and land cover change (LUCC) was quantified for the last 30 years within the Dianchi area of Yunnan province, P. R. China, using rectified aerial photographs and geographic information systems (GIS). The LUCC was projected for the next 15 years with Markov chains. The study explored the relationships between government policies, population growth, economy development and landscape change...
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