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Crop yield estimation is of great importance to food security. Normalized Difference Vegetation Index (NDVI), as an effective crop monitoring tool, is extensively used in crop yield estimation. However, there are few studies focusing on the aspect of mixed crops grown together. In this study, a correlation-based approach for crop yield estimation is applied to three small counties (Jianshui, Luliang,...
In this paper, through combining information diffusion principle and BP neural network theory, a new prediction model of drought disaster assessment is established. First, the original data are fuzzily processed based on information diffusion method, then a new training sample is formed; second, the new sample is used to design and train BP neural network; finally, the trained fuzzy neural network...
In this research, Mann-Kendall test was utilized in the trend test and abrupt change test of annual runoffs from 1956 to 2007 recorded in Houbi hydrological station in Zhuozhang River and Kuangmenkou hydrological station in Qingzhang River. Significant decrease in annual runoffs in both stations was detected, and the abruption point appeared in 1977. Through analysis, it was found the reasons for...
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