Cross-scale high-precision dynamic crop growth monitoring and yield assessment method based on high-resolution remote sensing data and a crop model

Abstract

The invention discloses a cross-scale high-precision dynamic crop growth monitoring and yield assessment method based on high-resolution satellite remote sensing data and a crop model. The method comprises the steps of achieving localization of the model is achieved; performing spatial matching on the remote sensing data and the ground data by using a GEE platform; designing a plurality of simulation scenes; dividing the growth period of the crops into a front time window and a rear time window by taking the green returning period as a node, and calculating various meteorological factors in the whole growth period; constructing a regression equation, and establishing a regression equation of each day in all growth periods; Extracting the maximum values of the satellite remote sensing observation vegetation indexes of two time windows before and after each year and corresponding dates thereof pixel by pixel, and converting the extracted maximum values of the vegetation indexes into independent variables LAI of a regression equation through an empirical formula; And taking the observation dates of the two time windows before and after extraction as references, carrying out pixel-by-pixel calculation by utilizing a regression equation corresponding to the combination date, and obtaining the crop simulation yield after operation on all pixels is completed.

Description

technical field [0001] The invention relates to the technical field of agricultural remote sensing, and more specifically to a cross-scale and high-precision dynamic crop growth monitoring and yield estimation method based on high-resolution remote sensing data and crop models. Background technique [0002] Traditional crop yield estimation methods are mainly divided into forecasting methods based on agronomic statistics, agricultural meteorological statistics, economic statistics and crop models. Due to the high time, manpower and material resources and the limitations of the crop model itself, these methods are difficult to achieve high-precision yield estimation of regional crops, especially the field-scale yield estimation. Remote sensing technology has three important characteristics of rapidity, macroscopicity and dynamics. It can quickly obtain large-scale surface information, and plays a huge role in large-scale crop growth monitoring and yield forecasting. It has un...

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Problems solved by technology

[0006] In order to solve the problems of high demand and difficulty in obtaining ground actual measurement data existing in crop yield estimation, weak model space application ability, uncertainty of assimilation algorithm and high calculation cost, the present invention provides a method based on Google EarthEngine (GEE) and crop growth The high-precision agricultural yield estimation method of the model is based on the calibrated CERES series crop model, and different simulation scenarios are set according to the actual local field management measures and crop environment. Combined with high spatial and temporal resolution remote sensing data, a model of yield, vegetation index and meteorological elements is constructed , to complete the yield estimation from point to area by pixel-by-pixel simulation

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