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Crop yield estimation method based on scale transformation and data assimilation

A technology of data assimilation and scale conversion, applied in the field of agricultural remote sensing

Active Publication Date: 2014-11-05
CHINA AGRI UNIV
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Problems solved by technology

[0004] In order to solve the following problems in the existing technology: "How to construct the scale conversion method in the data assimilation model, assimilate the time series scale corrected LAI to the crop growth model, so as to reduce the scale mismatch between the remote sensing observation and the crop model. Data assimilation model error", the present invention provides a crop yield estimation method based on scale conversion and data assimilation

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  • Crop yield estimation method based on scale transformation and data assimilation
  • Crop yield estimation method based on scale transformation and data assimilation
  • Crop yield estimation method based on scale transformation and data assimilation

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Embodiment 1

[0043] The technical scheme of the present invention is further described by taking the estimation of winter wheat yield in Baoding and Hengshui, Hebei as examples. The flow of the regional winter wheat yield estimation method based on scale conversion and data assimilation in this embodiment includes:

[0044] S1 collects the meteorological parameters, crop parameters, soil parameters and management parameters in the study area and uses them to perform single-point scale calibration of the WOFOST crop model; then regionalizes based on the meteorological parameters to complete the spatialization of the crop model. details as follows:

[0045] The Baoding and Hengshui areas in Hebei Province were selected as the research area, which is an important winter wheat production area in Hebei Province. Obtain the following data: select the six meteorological elements required by the maximum / minimum temperature, total radiation, water vapor pressure, wind speed, and precipitation mode...

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Abstract

The invention belongs to the field of agricultural remote sensing, and relates to a crop yield estimation method based on scale transformation and data assimilation and application of the crop yield estimation method to the guiding of crop production. The method comprises the following concrete steps that: 1, parameters are collected for completing spatialization of a WOFOST crop model; 2, a crop type distribution map and a purity percentage map of the crops to be tested are obtained; 3, TMLAI in a range of 30m is obtained; 4, a secondary scale conversion model is built, and a time sequence scale regulating LAI is generated; 5, the crop model error and the remote sensing observation error in a key phonological period of the crops to be tested are obtained; 6, a four-dimensional variation cost function is built, and an optimized crop model parameter is obtained; and 7, the per unit yield of the crops to be tested in a county region is output. The method provided by the invention has the advantages that the problem of scale mismatching between a remote sensing observation picture element and a crop model simulation unit is solved; the precision of a data assimilation model is improved; and the method is suitable for the crop yield estimation in the county region scale, and is particularly suitable for the winter wheat yield estimation in the county region scale.

Description

Technical field [0001] The invention belongs to the field of agricultural remote sensing, and specifically relates to a crop yield estimation method based on scale conversion and data assimilation. Background technique [0002] Using data assimilation technology to integrate remote sensing inversion parameters into crop mechanism process models is currently an important way to improve the accuracy of regional crop growth simulation and increase the accuracy of crop yield estimation. At the field scale, crop growth models based on crop photosynthesis, respiration, transpiration, nutrition and other mechanical processes rely on their inherent physical processes and dynamic mechanisms to accurately simulate the continuous evolution and single-step growth of crop objects with "day" as the time step. Crop growth and development status and yield at point scale. When the crop model is extended to the regional scale, due to the non-uniformity of the surface and near-surface environ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/02
Inventor 黄健熙田丽燕马鸿元苏伟陈英义刘峻明张晓东朱德海张超
Owner CHINA AGRI UNIV
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