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A method and system for determining yield-meteorological variation coefficient

A technology of variation coefficient and determination method, applied in data processing applications, forecasting, instruments, etc., can solve problems such as slow solution speed

Active Publication Date: 2020-07-03
AGRI INFORMATION INST OF CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the traditional yield regression model is solved by the least square method, it is not only impossible to add expert experience to constrain the regression model, but also the solution speed is slow

Method used

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  • A method and system for determining yield-meteorological variation coefficient
  • A method and system for determining yield-meteorological variation coefficient
  • A method and system for determining yield-meteorological variation coefficient

Examples

Experimental program
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Embodiment 1

[0088] A method for determining unit yield-meteorological variation coefficient, said method for determining comprises:

[0089] Step 101: Obtain multiple sets of historical data of the research object, wherein a set of historical data includes the meteorological element data of a certain year and the actual yield data corresponding to the year; in this embodiment, the yield-meteorological variation coefficient includes: yield - Illumination coefficient of variation (kg / ha*light hours), yield-temperature coefficient of variation (in kg / ha*degrees Celsius) and yield-precipitation coefficient of variation (kg / ha*mm).

[0090] Step 102: Substituting multiple sets of meteorological element data into the yield model of the research object to obtain yield functions corresponding to the years respectively;

[0091] In this embodiment, the correlation coefficients of temperature, light duration and precipitation are decomposed into q stages according to the crop growth cycle. For exa...

Embodiment 2

[0136] A system for determining yield-meteorological variation coefficient, said determining system comprising:

[0137] The data acquisition module 201 is used to acquire multiple sets of historical data of the research object, wherein a set of historical data includes meteorological element data of a certain year and actual yield data corresponding to the year;

[0138] Yield function determination module 202, connected with the data acquisition module, for substituting multiple sets of meteorological element data into the yield model of the research object, to obtain yield functions corresponding to the years respectively;

[0139] The objective function determination module 203 is connected with the data acquisition module and the yield function determination module respectively, and is used to determine the objective function according to the meteorological yield function and the actual yield data of each year;

[0140] Constraint condition determination module 204, conne...

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Abstract

The invention discloses a method and a system for determining a per unit yield-meteorological change coefficient. The determination method comprises steps: multiple groups of historical data of a studied object are acquired; the data are substituted to a per unit yield model, and a per unit yield function is obtained; according to a meteorological per unit yield function and the actual per unit yield data in each year, a target function is determined; according to different growth periods of the studied object and data of each meteorological element in a growth area, constraint conditions for each per unit yield-meteorological change coefficient are determined; initial parameters are set; a gradient function of the target function is determined according to the target function, and whether the norm of the gradient function is smaller than or equal to set convergence precision is judged; if yes, iteration is stopped; or otherwise, a divergence function of the gradient function is calculated; according to the gradient function, the divergence function, an augmentation function of the target function and the constraint conditions, a search range model is determined; and the search range model is solved to acquire the optimal per unit yield-meteorological change coefficient. The method and the system can quickly solve the per unit yield-meteorological change coefficient in the per unit yield model.

Description

technical field [0001] The invention relates to the field of crop yield estimation, in particular to a method and system for determining the yield-meteorological variation coefficient. Background technique [0002] Climate change has become a global environmental issue, especially the global climate change in the past 10 years has had a very serious impact on food production, water resources and energy production in many countries. In the context of climate warming today, a series of problems such as the instability of agricultural production and the increase in output fluctuations are particularly prominent. Therefore, accurately estimating the yield of crops is very important for the country to grasp the state of grain production in a timely and accurate manner, to carry out macro-control of grain, to gain the initiative in international agricultural product trade, and to formulate grain policies for the country. [0003] When predicting the yield of crops, in the prior a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/04G06Q50/02
CPCG06Q10/04G06Q50/02
Inventor 庄家煜许世卫李哲敏李干琼陈威
Owner AGRI INFORMATION INST OF CAS