Agricultural Productivity Assessment Research Based On Spectral Reflectance

In recent years, the development of remote sensing provides a new means for monitoring and researching the electromagnetic information between vegetation and environment. Particularly the high temporal resolution remote sensing data have achieved initial results in regional and global-scale phenological studies. Remote sensing is increasingly becoming an important means of vegetation phenological monitoring. Because of its high temporal resolution, covering a wide area, high temporal resolution remote sensing data has been widely used in regional and global-scale phenological studies Relative to the high temporal resolution remote sensing data, high resolution imaging spectral data is provided with higher spatial resolution, spectral resolution and greater potential for application. It is necessary to study environmental factors closely related to vegetation in order to better vegetation electromagnetic information based on remote sensing.The study is focused on electromagnetic characteristics of wheat and soil and its model. The electromagnetic research of wheat mainly studies the application of high spectral data in wheat phenological identification and monitoring based on time series. Through the analysis of spectral data of wheat, we study the various factors affecting the spectrum of wheat, until track to the source; then discuss the interaction mechanism between interior and external electromagnetic sources of wheat; finally research the electromagnetic model of wheat with hyper-spectral monitoring results of wheat in phenology. The electromagnetic research of soil discusses the diagnostic absorption features of many elements in it in the solar reflective spectral range; explores analysis means of electromagnetic source of soil and constructs the spectral model of soil in three aspects of spectral characteristics of soil:soil geochemical, geometric optics scattering and vegetation. On this basis, we study the formation mechanism, expression model and immixing method of wheat-soil model; eventually establish the application model library of wheat-soil electromagnetic source. Using the spectral changes of wheat to assess the wheat yield combined with fertility and grain yield of wheat.This paper is mainly divided into four parts: Part I:Introduction. It mainly discusses the purpose and significance of the study, analysis the background of research, introduces the domestic and international research trends and main research methods and summarizes the main objectives, content and ideas of this paper.Partâ…¡:The electromagnetic research of wheat. It mainly studies the various factors affecting the spectrum of wheat, until track to the source; then discusses the interaction mechanism of wheat electromagnetic sources; collects, summarizes and sorts out all the expression models of wheat; establishes the electromagnetic model with the mechanism.Partâ…¢:The electromagnetic research of soil. It mainly studies the various factors affecting the spectrum of soil, until track to the source; then discusses the interaction mechanism of soil electromagnetic sources; collects, summarizes and sorts out all the expression models of soil; establishes the electromagnetic model with the mechanism.Partâ…£:The electromagnetic research of wheat-soil mixed model. It mainly researches the formation mechanism, analysis and classification, the expression model and immixing method of wheat-soil electromagnetic source.Part V:The spectral characteristics of wheat and yield assessment. It mainly studies the spectral changes of wheat in phenology and assesses the wheat yield combined with fertility and grain yield of wheat.