Yield estimation of winter wheat in the Huang-Huai-Hai region using MODIS and meteorological data: spatio-temporal analysis and county-level modeling.

4 Discussion 4.1 Change characteristics of vegetation and meteorological factors and their relationship with yield Through the analysis of spectral reflectance frequency curves ( Figure 3 ), winter wheat exhibits an overall trend of “ Spectral compression and peak migration” across the three growth stages, reflecting the phasic changes in spectral response to vegetation growth.

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