CN116383728A - Meteorological prediction method based on zoned SVM - Google Patents
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Abstract
The invention discloses a meteorological prediction method based on a zoning SVM, which belongs to the technical field of meteorological prediction and solves the problem of lower prediction accuracy rate in the case of nonlinear data in the prior art, and comprises the following steps: dividing the area to be predicted into area grids, respectively collecting historical flight weather prediction factors, and constructing a regression model sample and a model verification sample by combining weather information in the area; building a support vector machine model, and optimizing parameters in the support vector machine model by adopting an ant colony algorithm; training a support vector machine model by using a regression model sample to obtain a globally optimal support vector machine model; and inputting the model verification sample into a globally optimal support vector machine model for verification. Through the scheme, the invention has the advantages of simple logic, accuracy, reliability and the like.
Description
Technical Field
The invention relates to the technical field of weather prediction, in particular to a weather prediction method based on a zoned SVM.
Background
The flight weather prediction factor in the technology mainly comprises: air temperature, precipitation, visibility, wind direction, relative humidity, wind speed, total cloud cover, low cloud cover, and the like. The weather forecast can guide daily production and life of human beings. Currently, traditional meteorological predictions rely on priors, such as thermodynamic properties of the atmosphere, statistical analysis of data, and ensemble learning involving multiple models with different initial conditions. In addition, in the statistical analysis of data, it is necessary to determine the relationship between the dependent variable and the independent variable, and to obtain the relationship from a complex mapping relationship. The method needs to screen from massive information, and if the data has nonlinearity, the accuracy is lower.
Therefore, it is highly desirable to provide a weather prediction method based on a zoned SVM, which is simple in logic, accurate and reliable.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a meteorological prediction method based on a zoned SVM, which adopts the following technical scheme:
a weather prediction method based on a zoned SVM comprises the following steps:
dividing the area to be predicted into area grids, respectively collecting historical flight weather prediction factors, and constructing a regression model sample and a model verification sample by combining weather information in the area;
building a support vector machine model, and optimizing parameters in the support vector machine model by adopting an ant colony algorithm;
training a support vector machine model by using a regression model sample to obtain a globally optimal support vector machine model;
and inputting the model verification sample into a globally optimal support vector machine model for verification.
Further, the method further comprises the following steps: and normalizing the collected historical flight weather prediction factors.
Further, the method further comprises the following steps: and carrying out correlation degree calculation on the normalized flying weather prediction factor by adopting a pearson correlation coefficient, combining weather information in the subareas, and obtaining a regression model sample and a model verification sample.
wherein,,representing the covariance of sample set X and sample set Y; />Representing the standard deviation of the sample set X; />Representing the standard deviation of the sample set Y; />Represents +.>A sample number; />Represents +.>A sample number; />Representing a sampleAverage value of set X; />Representing the average value of the sample set Y; />Representing the partial autocorrelation coefficients.
Further, the method further comprises the following steps: carrying out weather prediction on any regional grid by using a globally optimal support vector machine model, and carrying out sectional fitting by adopting a linear regression equation; and carrying out feedback correction by adopting the fitting effect to obtain the best fitting model.
Further, the support vector machine model performs type recognition on the sample, and the method comprises the following steps:
presetting a kernel function K, and constructing a cost function by using a regression model sampleThe expression is:
and (3) applying constraint conditions:
wherein,,representing a classification interface vector; />Indicate->Actual errors; b represents an intercept; />Representing a transpose of the classification interface vector matrix; c represents a penalty factor; />Represents +.sup.th containing kernel function K>Actual errors;
and constructing a Lagrangian function, and judging the type of the acquired sample according to the KKT condition.
Further, the expression of the lagrangian function is:
Further, the expression of the KKT condition is:
further, the type judgment is expressed as:
compared with the prior art, the invention has the following beneficial effects:
(1) According to the characteristic of rapid boundary layer weather change, the method creatively uses a segmented SVM method, adopts a segmented fitting mode for different areas, and automatically performs the division of the areas by adopting a mode of carrying out feedback correction on the fitting effect, thereby achieving the maximum fitting effect.
(2) The present invention seeks an optimal compromise between the complexity of the model (i.e. the learning accuracy for a particular training sample) and the learning ability (i.e. the ability to identify the sample without error) based on limited sample information, in order to obtain the best generalization ability. The SVM overcomes the defects of over-learning, local extreme points, dimension disasters and the like of the neural network and the traditional classifier, and has stronger generalization capability.
In conclusion, the method has the advantages of simple logic, accuracy, reliability and the like, and has high practical value and popularization value in the technical field of weather prediction.
Drawings
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope of protection, and other related drawings may be obtained according to these drawings without the need of inventive effort for a person skilled in the art.
FIG. 1 is a logic flow diagram of the present invention.
Detailed Description
For the purposes, technical solutions and advantages of the present application, the present invention will be further described with reference to the accompanying drawings and examples, and embodiments of the present invention include, but are not limited to, the following examples. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
In this embodiment, the term "and/or" is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone.
The terms first and second and the like in the description and in the claims of the present embodiment are used for distinguishing between different objects and not for describing a particular sequential order of objects. For example, the first target object and the second target object, etc., are used to distinguish between different target objects, and are not used to describe a particular order of target objects.
In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" means two or more. For example, the plurality of processing units refers to two or more processing units; the plurality of systems means two or more systems.
As shown in fig. 1, the embodiment provides a weather prediction method based on a zoned SVM, and the following flight weather prediction factors are selected: air temperature, precipitation, visibility, wind direction, relative humidity, wind speed, total cloud cover, low cloud cover. (mist on the ground when the cloud is grounded). And forming input and output samples according to the data collected in the history and haze, icing, rainfall and strong wind, dividing the samples into regression model samples and model verification samples, obtaining a boundary layer weather prediction model based on SVM, and predicting weather conditions of future boundaries by using the model.
Specifically, the weather prediction method of the present embodiment includes the following steps:
firstly, dividing a region grid of a region to be predicted, respectively collecting historical flight weather prediction factors, and constructing a regression model sample and a model verification sample by combining weather information in the region. In this step, the collected historical flight weather predictors are normalized. On the basis of normalization processing, the correlation of the data needs to be obtained so as to obtain a reliable regression model sample.
In this embodiment, the normalized flying weather prediction factor is obtained by using pearson correlation coefficient to calculate the correlation degree, and the regression model is obtained by combining the weather information in the subareaSample and model verification sample, wherein pearson correlation coefficientThe expression of (2) is:
wherein,,representing the covariance of sample set X and sample set Y; />Representing the standard deviation of the sample set X; />Representing the standard deviation of the sample set Y; />Represents +.>A sample number; />Represents +.>A sample number; />Representing the average value of the sample set X; />Representing the average value of the sample set Y; />Representing the partial autocorrelation coefficients.
In this embodiment, an optimal tradeoff is sought between the complexity of the model (i.e., the learning accuracy for a particular training sample) and the learning ability (i.e., the ability to identify samples without error), and the type identification of samples by the support vector machine model, which includes the steps of:
presetting a kernel function K, and constructing a cost function by using a regression model sampleThe expression is:
and (3) applying constraint conditions:
wherein,,representing a classification interface vector; />Representing a first actual error; b represents an intercept; />Representing a transpose of the classification interface vector matrix; c represents a penalty factor; />Represents +.sup.th containing kernel function K>Actual errors;
the Lagrangian function is constructed with the expression:
Judging the type of the acquired sample according to a KKT condition, wherein the expression of the KKT condition is as follows:
the type judgment expression is:
secondly, building a support vector machine model, and optimizing parameters in the support vector machine model by adopting an ant colony algorithm, wherein the parameters are specifically:
(1) Initializing a penalty factor c and a kernel function parameter K in the support vector machine parameters;
(2) Training a support vector machine by using the normalized sample data;
(3) And setting the maximum iteration times, and performing global optimization on the penalty factor c and the kernel function parameter K by utilizing an ant colony algorithm to finally obtain an optimal prediction model.
Thirdly, training a support vector machine model by using a regression model sample to obtain a globally optimal support vector machine model;
and fourthly, inputting the model verification sample into a globally optimal support vector machine model for verification.
In addition, in the embodiment, weather prediction is performed on any regional grid by using a globally optimal support vector machine model, and a linear regression equation is adopted for segmented fitting; and carrying out feedback correction by adopting the fitting effect to obtain the best fitting model.
The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention, but all changes made by adopting the design principle of the present invention and performing non-creative work on the basis thereof shall fall within the scope of the present invention.
Claims (9)
1. The weather prediction method based on the zoned SVM is characterized by comprising the following steps of:
dividing the area to be predicted into area grids, respectively collecting historical flight weather prediction factors, and constructing a regression model sample and a model verification sample by combining weather information in the area;
building a support vector machine model, and optimizing parameters in the support vector machine model by adopting an ant colony algorithm;
training a support vector machine model by using a regression model sample to obtain a globally optimal support vector machine model;
and inputting the model verification sample into a globally optimal support vector machine model for verification.
2. The zoned SVM-based weather prediction method of claim 1, further comprising: and normalizing the collected historical flight weather prediction factors.
3. The zoned SVM-based weather prediction method of claim 2, further comprising: and carrying out correlation degree calculation on the normalized flying weather prediction factor by adopting a pearson correlation coefficient, combining weather information in the subareas, and obtaining a regression model sample and a model verification sample.
4. A zoned SVM-based weather prediction method in accordance with claim 3, wherein the pearson correlation coefficientThe expression of (2) is:
wherein,,representing the covariance of sample set X and sample set Y; />Representing the standard deviation of the sample set X; />Representing the standard deviation of the sample set Y; />Represents +.>A sample number; />Represents +.>A sample number; />Representing the average value of the sample set X; />Representing the average value of the sample set Y; />Representing the partial autocorrelation coefficients.
5. The zoned SVM-based weather prediction method of claim 1, further comprising: carrying out weather prediction on any regional grid by using a globally optimal support vector machine model, and carrying out sectional fitting by adopting a linear regression equation; and carrying out feedback correction by adopting the fitting effect to obtain the best fitting model.
6. The method for weather prediction based on a zoned SVM according to claim 4, wherein the support vector machine model performs type recognition on the samples, comprising the steps of:
presetting a kernel function K, and constructing a cost function by using a regression model sampleThe expression is:
and (3) applying constraint conditions:
wherein,,representing a classification interface vector; />Represents the first->Actual errors; b represents an intercept; />Representing a transpose of the classification interface vector matrix; c represents a penalty factor; />Represents the first +.>Actual errors;
and constructing a Lagrangian function, and judging the type of the acquired sample according to the KKT condition.
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