CN113486844B - Horizontal wind shear position judgment method and device, electronic equipment and storage medium - Google Patents
Horizontal wind shear position judgment method and device, electronic equipment and storage medium Download PDFInfo
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Abstract
The invention provides a method and a device for judging a horizontal wind shear position, electronic equipment and a storage medium, wherein the method comprises the following steps: and acquiring a plurality of key points of the high air pressure contour line. A plurality of consecutive keypoints is selected from the plurality of keypoints of the high air pressure contour. Wherein the plurality of continuous key points are any plurality of continuous key points in the high air pressure contour line. The curvature of the intermediate keypoints is calculated from the coordinates of a plurality of consecutive keypoints. Wherein the intermediate key point is a key point in the middle of a plurality of continuous key points. The curvatures of intermediate keypoints of any of the plurality of consecutive keypoints constitute the curvatures of keypoints of the high-altitude air-pressure contour. And comparing the curvatures of a plurality of key points of the high air pressure contour line with a preset threshold value to obtain a comparison result. A specified segment is selected from the high air pressure contour. Wherein the curvatures of a plurality of key points contained in the designated segment are all larger than the predetermined threshold. And (4) taking the coordinate of the key point with the maximum curvature in the designated segment as the horizontal wind shear position.
Description
Technical Field
The present invention relates to the field of meteorological technologies, and in particular, to a method and an apparatus for determining a horizontal wind shear position, an electronic device, and a storage medium.
Background
The air pressure contour line is a closed line formed by connecting points where the air pressure is equal in a certain time on a plane view, and can display the distribution condition of the air pressure in the space. Since the air pressure contour is a curve, the degree of curvature of the air pressure contour at a point can be expressed by calculating the curvature of the air pressure at the point. The curvature (curvature) of a curve is the rotation rate of the tangential angle to the arc length for a certain point on the curve, indicating the degree to which the curve deviates from a straight line. The numerical value of the degree of curve bending at a certain point is mathematically expressed.
Wind shear is an atmospheric phenomenon, i.e. the variation of the wind vector (wind direction, wind speed) over horizontal and/or vertical distances in the air. Wind shear can be divided into horizontal shear of horizontal wind, vertical shear of horizontal wind, and shear of vertical wind according to wind direction. The existence of the vertical wind shear can cause damage to bridges, high-rise buildings, aviation flight and the like, so that the method has great significance in determining the position where the wind shear occurs. At present, the horizontal wind shear is mainly recognized in a manual mode, so that the horizontal wind shear recognition is not accurate.
Aiming at the problem of inaccurate identification caused by manual identification of horizontal wind shear in the prior art, no effective solution is provided.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for determining a horizontal wind shear position, an electronic device, and a storage medium, so as to solve the problem of inaccurate identification caused by manual horizontal wind shear identification in the prior art.
Therefore, the embodiment of the invention provides the following technical scheme:
in a first aspect of the present invention, a method for determining a horizontal wind shear position is provided, including:
acquiring a plurality of key points of the high-altitude air pressure contour line; wherein, the interval of the adjacent key points is specified longitude and/latitude;
selecting a plurality of consecutive keypoints from the plurality of keypoints of the high-altitude barometric contour; wherein the plurality of continuous key points are any plurality of continuous key points in the high air pressure contour line;
calculating the curvature of the middle key point according to the coordinates of the continuous key points; wherein the intermediate key point is a key point among the plurality of continuous key points; the curvatures of a plurality of intermediate key points of the arbitrary plurality of continuous key points constitute the curvatures of a plurality of key points of the high air pressure contour line;
comparing curvatures of a plurality of key points of the high-altitude air pressure contour line with a preset threshold value to obtain a comparison result;
selecting a designated segment from the high air pressure contour; wherein the curvatures of a plurality of key points contained in the designated segment are all larger than the predetermined threshold;
and taking the coordinate of the key point with the maximum curvature in the specified segment as the horizontal wind shear position.
Optionally, calculating the curvature of the intermediate keypoint from the coordinates of the plurality of consecutive keypoints comprises:
acquiring a first key point, a second key point and a third key point according to the continuous key points; the first key point is the middle key point, the second key point is at least one key point adjacent to one side of the middle key point, and the third key point is at least one key point adjacent to the other side of the middle key point;
determining a line segment according to the second key point and the third key point, and acquiring the slope of the line segment and the midpoint coordinate of the line segment;
calculating difference values between the coordinates of the first key point, the coordinates of the second key point and the coordinates of the third key point and the coordinates of the middle point respectively to obtain a first coordinate, a second coordinate and a third coordinate;
acquiring a rotation angle according to the slope of the line segment;
respectively performing rotation operation on the first coordinate, the second coordinate and the third coordinate by using the rotation angle to obtain a corresponding fourth coordinate, a corresponding fifth coordinate and a corresponding sixth coordinate;
fitting a designated function by using the fourth coordinate, the fifth coordinate and the sixth coordinate to obtain each parameter of the designated function;
and acquiring the curvature of the middle key point according to the parameters and the fourth coordinate.
Optionally, the rotating the first coordinate, the second coordinate, and the third coordinate using the rotation angle, respectively, and acquiring a corresponding fourth coordinate, a corresponding fifth coordinate, and a corresponding sixth coordinate includes:
respectively rotating the first coordinate, the second coordinate and the third coordinate by using the rotation angle through the following formulas to obtain a corresponding fourth coordinate, a corresponding fifth coordinate and a corresponding sixth coordinate:
the rotation angle is as follows: θ ═ arctan (k);
wherein (a3, b3) is any of the first coordinate, the second coordinate, and the third coordinate, (a4, b4) is any of the fourth coordinate, the fifth coordinate, and the sixth coordinate, k is the slope, and θ is a rotation angle.
Optionally, fitting a specified function by using the fourth coordinate, the fifth coordinate, and the sixth coordinate, and obtaining each parameter of the specified function includes:
constructing a least square matrix according to the fourth coordinate, the fifth coordinate, the sixth coordinate and the designated function; wherein the least squares matrix is represented as:
B＝(ATA)-1ATY；
wherein B is a parameter matrix of the specified function, and A represents a matrix constructed by each abscissa of the fourth, fifth, and sixth coordinates in combination with the type of the specified function; a. theTA transposed matrix representing the A matrix, (A)TA)-1Representation matrix ATAn inverse matrix of a matrix formed by multiplying the matrix a, and Y denotes a matrix constructed by each of the fourth coordinate, the fifth coordinate, and the sixth coordinate in combination with the type of the specified function.
Optionally, the obtaining the curvature of the middle key point according to the parameters further includes:
the designated function is a quadratic function, and the curvature of the middle key point is obtained through the parameters of the quadratic function and the fourth coordinate; wherein the quadratic function is y ═ ax2+ bx + c, the curvature calculation formula of the middle key point is:
cur represents the curvature of the middle key point, a, b and c are parameters of a quadratic function, x is an independent variable of the quadratic function, y is a dependent variable of the quadratic function, and a5 represents the abscissa of the fourth coordinate.
Optionally, the method further comprises:
selecting a specified segment from the high air pressure contour comprises:
marking a plurality of key points of the high air pressure contour line according to the comparison result;
acquiring a starting key point and an ending key point in the high-altitude air pressure contour line key points corresponding to a plurality of continuous marks; wherein the starting key point is the first key point in the high air pressure contour key points corresponding to the continuous marks, and the ending key point is the last key point in the high air pressure contour key points corresponding to the continuous marks;
and acquiring the high air pressure contour line segment between the starting key point and the ending key point on the high air pressure contour line as a designated segment.
In a second aspect of the present invention, there is provided a horizontal wind shear position determination device, comprising:
the first acquisition module is used for acquiring a plurality of key points of the high-altitude air pressure contour line; wherein, the interval of the adjacent key points is specified longitude and/latitude;
the first selection module is used for selecting a plurality of continuous key points from a plurality of key points of the high air pressure contour line; wherein the plurality of continuous key points are any plurality of continuous key points in the high air pressure contour line;
the calculation module is used for calculating the curvature of the middle key point according to the coordinates of the continuous key points; wherein the intermediate key point is a key point among the plurality of continuous key points; the curvatures of a plurality of intermediate key points of the arbitrary plurality of continuous key points constitute the curvatures of a plurality of key points of the high air pressure contour line;
the comparison module is used for comparing the curvatures of a plurality of key points of the high-altitude air pressure contour line with a preset threshold value to obtain a comparison result;
the second selection module is used for selecting the appointed section from the high air pressure contour line; wherein the curvatures of a plurality of key points contained in the designated segment are all larger than the predetermined threshold;
and the second acquisition module is used for taking the coordinates of the key point with the maximum curvature in the specified segment as the horizontal wind shear position.
Optionally, the calculation module comprises:
a first obtaining unit, configured to obtain a first key point, a second key point, and a third key point according to the plurality of consecutive key points; the first key point is the middle key point, the second key point is at least one key point adjacent to one side of the middle key point, and the third key point is at least one key point adjacent to the other side of the middle key point;
the determining unit is used for determining a line segment according to the second key point and the third key point, and acquiring the slope of the line segment and the midpoint coordinate of the line segment;
the second acquisition unit is used for calculating the difference between the coordinate of the first key point, the coordinate of the second key point and the coordinate of the third key point and the coordinate of the middle point respectively to acquire a first coordinate, a second coordinate and a third coordinate;
a third obtaining unit, configured to obtain a rotation angle according to a slope of the line segment;
the rotating unit is used for respectively rotating the first coordinate, the second coordinate and the third coordinate by using the rotating angle to acquire a corresponding fourth coordinate, a corresponding fifth coordinate and a corresponding sixth coordinate;
the fitting unit is used for fitting a specified function by using the fourth coordinate, the fifth coordinate and the sixth coordinate to obtain each parameter of the specified function;
and the fourth acquisition unit is used for acquiring the curvature of the middle key point according to the parameters and the fourth coordinate.
In a third aspect of the present invention, there is provided an electronic device comprising:
a processor; and
a memory for storing a program, wherein the program is stored in the memory,
wherein the program comprises instructions which, when executed by the processor, cause the processor to carry out the horizontal windshear position determination method according to any one of the first aspects.
In a fourth aspect of the present invention, there is provided a non-transitory computer readable storage medium having stored thereon computer instructions for causing a computer to execute the horizontal wind shear position determination method according to any one of the first aspect.
The technical scheme of the embodiment of the invention has the following advantages:
the embodiment of the invention provides a method and a device for judging a horizontal wind shear position, electronic equipment and a storage medium, wherein the method comprises the following steps: and acquiring a plurality of key points of the high air pressure contour line. Wherein the interval between adjacent key points is a specified longitude and/or latitude. A plurality of consecutive keypoints is selected from the plurality of keypoints of the high air pressure contour. Wherein the plurality of continuous key points are any plurality of continuous key points in the high air pressure contour line. The curvature of the intermediate keypoints is calculated from the coordinates of a plurality of consecutive keypoints. Wherein the intermediate key point is a key point among a plurality of consecutive key points. The curvatures of intermediate keypoints of any of the plurality of consecutive keypoints constitute the curvatures of keypoints of the high-altitude air-pressure contour. And comparing the curvatures of a plurality of key points of the high air pressure contour line with a preset threshold value to obtain a comparison result. A specified segment is selected from the high air pressure contour. Wherein, the curvatures of a plurality of key points contained in the designated segment are all larger than the predetermined threshold value. And (4) taking the coordinate of the key point with the maximum curvature in the designated segment as the horizontal wind shear position. The embodiment of the invention solves the problem of inaccurate identification caused by manual identification of horizontal wind shear in the prior art. In the embodiment of the invention, horizontal wind shear can be identified through a computer, so that the inaccuracy of manually identifying the horizontal wind shear is avoided, and the identification of the wind shear is not dependent on a wind field diagram any more.
Drawings
Further details, features and advantages of the invention are disclosed in the following description of exemplary embodiments with reference to the accompanying drawings, in which:
fig. 1 shows a flow chart of a horizontal wind shear position determination method according to an embodiment of the invention;
FIG. 2 shows a flow chart of a method of curvature computation of intermediate keypoints, according to an embodiment of the invention;
fig. 3 shows a schematic block diagram of a horizontal wind shear position determination apparatus according to an embodiment of the present invention;
FIG. 4 illustrates a block diagram of an exemplary electronic device that can be used to implement an embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and the embodiments of the present invention are illustrative only and are not intended to limit the scope of the present invention.
It should be understood that the various steps recited in the method embodiments of the present invention may be performed in a different order and/or performed in parallel. Moreover, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the invention is not limited in this respect.
The term "include" and variations thereof as used herein are open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions for other terms will be given in the following description. It should be noted that the terms "first", "second", and the like in the present invention are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules or units.
It is noted that references to "a", "an", and "the" modifications in the present invention are intended to be illustrative rather than limiting, and that those skilled in the art will recognize that reference to "one or more" unless the context clearly dictates otherwise.
According to an embodiment of the present invention, there is provided an embodiment of a horizontal wind shear position determination method, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the present embodiment, a horizontal wind shear position determination method 100 is provided, which may be used in a horizontal wind shear determination system, such as a horizontal wind shear position determination system on an aircraft, and fig. 1 is a flowchart of a horizontal wind shear position determination method according to an embodiment of the present invention, as shown in fig. 1, where the flowchart includes the following steps:
step 101, obtaining a plurality of key points of the high air pressure contour line. Wherein the interval between adjacent key points is a specified longitude and/or latitude. Specifically, a plurality of key points are selected from the high-altitude barometric contour line according to the longitude or the latitude with the specified size as an interval, so that the calculation amount is reduced on the premise of not influencing subsequent calculation. For example, when the high air pressure contour is a closed curve, a point on the high air pressure contour is randomly selected as a first key point. Then, along any extending direction of the high-altitude air pressure contour line, selecting a second key point at intervals of specified longitude or latitude, and sequentially selecting key points such as a third key point and the like along the high-altitude air pressure contour line until the last key point is taken as a starting end point. Meanwhile, the interval between the last key point and the start end point may be less than a specified longitude or latitude. In addition, when the high air pressure contour line is an unclosed curve, two end points of the high air pressure contour line are a first key point and a last key point respectively. The empirically specified longitude or latitude may be selected between 0.5 degrees and 1.5 degrees. Meanwhile, the plurality of key points of the high air pressure contour line at least comprise 3 key points of the high air pressure contour line.
Step 102, selecting a plurality of continuous key points from a plurality of key points of the high air pressure contour line. Wherein the plurality of continuous key points are any plurality of continuous key points in the high air pressure contour line. Specifically, a plurality of continuous key points are selected from a plurality of key points of the high air pressure contour line in sequence, and the key point with the curvature to be solved is taken as a middle key point of the plurality of continuous key points so as to obtain the curvature of the middle key point. And when the high-altitude air pressure contour line is closed, randomly selecting one key point from a plurality of key points of the high-altitude air pressure contour line as a middle key point, wherein the middle indicates that the two adjacent sides of the middle key point both contain the key point, simultaneously carrying out subsequent processing on the middle key point, after the processing is finished, selecting the next middle key point along any extending direction of the high-altitude air pressure contour line, carrying out the subsequent processing in the same way, repeating the process until all the key points on the high-altitude air pressure contour line are treated as the middle key points, and further solving the curvature of the plurality of key points of the high-altitude air pressure contour line. In addition, if the high altitude contour is a non-closed curve, the first and last keypoints of the plurality of keypoints of the high altitude contour may not be intermediate keypoints.
Step 103, calculating the curvature of the middle key point according to the coordinates of a plurality of continuous key points. Wherein the intermediate key point is a key point among a plurality of consecutive key points. The curvatures of intermediate keypoints of any of the plurality of consecutive keypoints constitute the curvatures of keypoints of the high-altitude air-pressure contour. Specifically, the middle key point refers to one of a plurality of key points of the high air pressure contour, and at least one key point is respectively acquired along two extending directions of the high air pressure contour with the middle key point as a starting point, so that the adjacent two sides of the middle key point both include the key point, and thus the middle key point and the key points acquired along the two extending directions of the high air pressure contour constitute a plurality of continuous key points. And calculating the curvature of each of the plurality of key points of the obtained high air pressure contour line as the key point of the middle key point so as to obtain the curvature maximum values of the plurality of key points of the high air pressure contour line in a subsequent step.
And 104, comparing the curvatures of a plurality of key points of the high-altitude air pressure contour line with a preset threshold value to obtain a comparison result. The curvatures of a plurality of key points of the high air pressure contour line are compared with a preset threshold value, and then the maximum curvature values of the plurality of key points of the high air pressure contour line are obtained. And the predetermined threshold is an empirical value obtained empirically taking into account a plurality of high air pressure contours.
And step 106, taking the coordinates of the key point with the maximum curvature in the designated segment as the horizontal wind shear position. According to the weather principle, the horizontal wind shear is generated at the position where the high-altitude air pressure contour turns violently, namely the position of the curvature maximum point of the high-altitude air pressure contour.
Through the steps, the horizontal wind shear can be automatically identified through the computer according to the high-altitude air pressure contour line, and therefore the problem of inaccurate identification caused by manual identification of the horizontal wind shear in the prior art is solved. In the embodiment of the invention, horizontal wind shear can be identified through a computer, so that the inaccuracy of manually identifying the horizontal wind shear is avoided, and the identification of wind shear is not dependent on wind field projection. The embodiment of the invention also has universality, has better curve effect on various shapes, has strong generalization capability, is insensitive to threshold parameters and has strong adaptability
As shown in fig. 2, to illustrate the curvature computation 200 of the intermediate keypoints, in some alternative embodiments, computing the curvature of the intermediate keypoints from the coordinates of a plurality of consecutive keypoints comprises:
and acquiring a first key point, a second key point and a third key point according to the plurality of continuous key points. The first key point is the middle key point, the second key point is at least one key point adjacent to one side of the middle key point, and the third key point is at least one key point adjacent to the other side of the middle key point. Specifically, the first keypoint can be ensured to be positioned between the second keypoint and the third keypoint by selecting adjacent keypoints at two sides of the first keypoint, and the first keypoint, the second keypoint and the third keypoint can be ensured to be continuous.
And determining a line segment according to the second key point and the third key point, and acquiring the slope of the line segment and the midpoint coordinate of the line segment. Specifically, since two points may determine a line segment, of the second and third keypoints, two keypoints farthest from the first keypoint in two extension directions along the high air pressure contour may uniquely determine a line segment, and the distance herein refers to a curve length between two keypoints on the high air pressure contour, and the slope of the line segment and the midpoint coordinate of the line segment may be obtained from coordinates of the two points. For example, the coordinates of two points are (a1, b1) and (a2, b2), respectively, then the slope of the segment
Coordinates of the midpoint of the line segment
And calculating the difference between the coordinate of the first key point, the coordinate of the second key point and the coordinate of the third key point and the coordinate of the middle point of the line segment respectively to obtain the first coordinate, the second coordinate and the third coordinate. Specifically, the horizontal and vertical coordinate values in the middle point coordinates of the line segment determined by the second key point and the third key point are respectively subtracted from the horizontal and vertical coordinate values in the coordinates of the first key point to obtain a difference coordinate, and the difference coordinate is taken as the first coordinate; and in the same way, the horizontal and vertical coordinate values in the midpoint coordinate are respectively subtracted from the horizontal and vertical coordinate values in the second key point coordinate and the third key point coordinate, so as to obtain a second coordinate and a third coordinate. The aim of decentralization is achieved by obtaining the difference between the first key point coordinate, the second key point coordinate and the third key point coordinate and the midpoint coordinate of the line segment, and further preparation is made for subsequent rotation.
And acquiring the rotation angle according to the slope of the line segment. And respectively carrying out rotation operation on the first coordinate, the second coordinate and the third coordinate by using the rotation angle to obtain a corresponding fourth coordinate, a corresponding fifth coordinate and a corresponding sixth coordinate. And enabling the first coordinate, the second coordinate and the third coordinate to accord with a function mapping relation through rotation operation, and further performing function fitting through the rotated coordinates.
And fitting the designated function by using the fourth coordinate, the fifth coordinate and the sixth coordinate to obtain each parameter of the designated function. And acquiring the curvature of the middle key point according to each parameter and the fourth coordinate. Specifically, a general formula of the designated function is determined through the type of the designated function, the designated function is fitted through the fourth coordinate, the fifth coordinate and the sixth coordinate, various parameters of the designated function are obtained, and the curvature of the middle key point is obtained through the various parameters of the designated function and the abscissa of the fourth coordinate.
To illustrate the rotation operation, in some alternative embodiments, performing the rotation operation on the first coordinate, the second coordinate, and the third coordinate using the rotation angle, respectively, and acquiring the corresponding fourth coordinate, the fifth coordinate, and the sixth coordinate includes: and respectively rotating the first coordinate, the second coordinate and the third coordinate by using the rotation angle through the following formulas to obtain a corresponding fourth coordinate, a corresponding fifth coordinate and a corresponding sixth coordinate:
the rotation angle is as follows: θ ═ arctan (k).
Wherein (a3, b3) is any coordinate among the first coordinate, the second coordinate and the third coordinate, and (a4, b4) is any coordinate among the fourth coordinate, the fifth coordinate and the sixth coordinate, k is the slope, and θ is the rotation angle. Specifically, the coordinates and the trigonometric function are calculated, so that the rotated coordinates conform to the function mapping relationship.
To illustrate the fitting of the specified function, in some alternative embodiments, the fitting of the specified function using the fourth coordinate, the fifth coordinate, and the sixth coordinate, and obtaining the parameters of the specified function includes: and constructing a least square matrix according to the fourth coordinate, the fifth coordinate, the sixth coordinate and the specified function. Wherein the least squares matrix is represented as:
B＝(ATA)-1ATY，
where B is a parameter matrix of the specified function, and a denotes a matrix constructed by each abscissa of the fourth coordinate, the fifth coordinate, and the sixth coordinate in combination with the type of the specified function. A. theTA transposed matrix representing the A matrix, (A)TA)-1Representation matrix ATAnd Y represents a matrix constructed by each ordinate of the fourth coordinate, the fifth coordinate, and the sixth coordinate in combination with the type of the specified function. The method comprises the steps of fitting the designated function through a least square method, finding the optimal function matching of data through minimizing the square sum of errors, simply and conveniently obtaining unknown data through the least square method, enabling the square sum of the errors between the obtained data and actual data to be the minimum, and enabling the fitted designated function to represent a fitting curve. Those skilled in the art will appreciate that the method of least squares fitting the assigned function is not intended to be limiting and that other methods of fitting the assigned function are within the scope of the present invention. For example, the specified function is fitted by the undetermined coefficient method.
To illustrate obtaining the curvature of the intermediate keypoint, in some alternative embodiments, obtaining the curvature of the intermediate keypoint from the respective parameters further comprises: the designated function is a quadratic function, and the curvature of the middle key point is obtained through the parameters of the quadratic function and the fourth coordinate; wherein the quadratic function is y ═ ax2+ bx + c, the curvature calculation formula of the middle key point is:
cur represents the curvature of the middle key point, a, b and c are parameters of a quadratic function, x is an independent variable of the quadratic function, y is a dependent variable of the quadratic function, and a5 represents the abscissa of the fourth coordinate. Specifically, the quadratic function is used as the specified function, fitting can be performed through fewer key points, and the calculation amount is reduced. Meanwhile, the curvature of the middle key point can be effectively calculated through the curvature calculation formula.
In some alternative embodiments, selecting the specified segment from the high air pressure contour comprises: and marking a plurality of key points of the high air pressure contour line according to the comparison result. Specifically, the keypoints with curvatures greater than a predetermined threshold of the plurality of keypoints of the high air pressure contour are labeled as 1, and the other keypoints are labeled as 0.
Acquiring a starting key point and an ending key point in high-altitude air pressure contour line key points corresponding to a plurality of continuous marks; the starting key point is the first key point in the high air pressure contour key points corresponding to the continuous marks, and the ending key point is the last key point in the high air pressure contour key points corresponding to the continuous marks; specifically, by continuing a plurality of marks of 1, a curvature value corresponding to the mark can be obtained, and then a key point on the high air pressure contour corresponding to the curvature value can be obtained from the curvature value. And acquiring a high air pressure contour segment between the starting key point and the ending key point on the high air pressure contour as an appointed segment, and further accurately acquiring a segment of a maximum value of the curvatures of a plurality of key points of the high air pressure contour.
In a specific embodiment, contour keypoints are determined at intervals of a specified longitude or latitude, and the keypoints are stored in a computer memory in sequence to form a keypoint list. Obtaining intermediate key points and two key points which are adjacent to each other in front of and behind each intermediate key point from the key point list, wherein the key points are 5 key points which are respectively marked as (x0, y0), (x1, y1), (x2, y2), (x3, y3) and (x4, y4) according to the sequence, wherein the key points are respectively marked as (x0, y0), (x1, y1), (x2, y2)(x0, y0), (x1, y1) are the first two keypoints, (x3, y3), (x4, y4) are the last two keypoints. Then, the slope k of the line segment determined by (x0, y0) and (x4, y4) is calculated with the midpoint of the line segment, the midpoint coordinate being
The line segment midpoint coordinates were subtracted from (x0, y0), (x1, y1), (x2, y2), (x3, y3), and (x4, y4), respectively
Decentralization was performed to obtain new coordinates of 5 points (x5, y5), (x6, y6), (x7, y7), (x8, y8), and (x9, y 9). The rotation angle θ is calculated from the slope k of the line segment, and (x5, y5), (x6, y6), (x7, y7), (x8, y8) and (x9, y9) are respectively substituted into the formulas
Wherein, (a3, b3) are (x5, y5), (x6, y6), (x7, y7), (x8, y8) and (x9, y9), respectively, (a4, b4) are (x10, y10), (x11, y11), (x12, y12), (x13, y13) and (x14, y14), respectively. Fitting a quadratic function according to (x10, y10), (x11, y11), (x12, y12), (x13, y13) and (x14, y14), constructing a least squares matrix, and further obtaining the quadratic function y as ax2+ bx + c.
According to formula (B) ═ ATA)-1ATY is calculated to obtain a parameter matrix of which B is a quadratic function
According to the parameters of the quadratic function and x12
The curvature cur of the intermediate keypoint (x2, y2) is calculated. And in addition, when the high-pressure contour line is a non-closed curve, the curvatures of the first key point and the last key point in the key point list are not calculated. And generating a mark list with the same length as the curvature list, initializing all internal elements of the mark list to be 0, traversing the curvature list, and setting the element at the corresponding position in the mark list to be 1 if the curvature value of one position is greater than a preset threshold value. Then, determining a plurality of continuous segments marked as 1 in the mark list according to the marks in the mark list, determining the starting position and the ending position of each continuous segment marked as 1 in the mark list, traversing from the corresponding starting position to the corresponding ending position in the curvature list, obtaining the maximum curvature value as a local curvature maximum value, obtaining the coordinate of an intermediate key point corresponding to the local curvature maximum value in the key point list, and further determining the position of the horizontal wind shear, wherein the coordinate of the intermediate key point is the coordinate of the horizontal wind shear. It will be understood by those skilled in the art that the number of consecutive keypoints selected from the keypoint list is 5 keypoints and is not intended to limit the present invention, and that other numbers of consecutive keypoints selected from the keypoint list are within the scope of the present invention. For example, the middle keypoint is selected from the keypoint list, and 1 keypoint is adjacent to the front of the middle keypoint and 1 keypoint is adjacent to the back of the middle keypoint, so that the number of consecutive keypoints selected from the keypoint list is 3.
In this embodiment, a horizontal wind shear position determining device is further provided, and the device is used to implement the foregoing embodiments and preferred embodiments, which have already been described and are not described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
The present embodiment provides a horizontal wind shear position determination device 300, as shown in fig. 3, including:
a first obtaining module 301, configured to obtain multiple key points of a high air pressure contour; wherein, the interval of the adjacent key points is specified longitude and/latitude;
a first selecting module 302, configured to select a plurality of consecutive keypoints from a plurality of keypoints of the high-altitude air pressure contour; wherein the plurality of continuous key points are any plurality of continuous key points in the high air pressure contour line;
a calculating module 303, configured to calculate a curvature of the middle key point according to coordinates of the multiple continuous key points; wherein the intermediate key point is a key point among the plurality of continuous key points; the curvatures of a plurality of intermediate key points of the random plurality of continuous key points form the curvatures of a plurality of key points of the high air pressure contour line;
the comparison module 304 is configured to compare curvatures of a plurality of key points of the high air pressure contour with a predetermined threshold to obtain a comparison result;
a second selection module 305 for selecting a specified segment from the high air pressure contour; wherein, the curvatures of a plurality of key points contained in the appointed section are all larger than a preset threshold value;
and a second obtaining module 306, configured to use the coordinates of the key point with the largest curvature in the designated segment as the horizontal wind shear position.
Optionally, the calculation module comprises:
a first obtaining unit configured to obtain a first key point, a second key point, and a third key point according to a plurality of consecutive key points; the first key point is the middle key point, the second key point is at least one key point adjacent to one side of the middle key point, and the third key point is at least one key point adjacent to the other side of the middle key point;
the determining unit is used for determining a line segment according to the second key point and the third key point and acquiring the slope of the line segment and the midpoint coordinate of the line segment;
the second acquisition unit is used for calculating the difference value between the coordinate of the first key point, the coordinate of the second key point and the coordinate of the third key point and the coordinate of the middle point respectively to acquire the first coordinate, the second coordinate and the third coordinate;
the third acquisition unit is used for acquiring the rotation angle according to the slope of the line segment;
the rotating unit is used for respectively rotating the first coordinate, the second coordinate and the third coordinate by using the rotating angle to acquire a corresponding fourth coordinate, a corresponding fifth coordinate and a corresponding sixth coordinate;
the fitting unit is used for fitting the designated function by using the fourth coordinate, the fifth coordinate and the sixth coordinate to obtain each parameter of the designated function;
and the fourth acquisition unit is used for acquiring the curvature of the middle key point according to the parameters and the fourth coordinate.
An embodiment of the present invention further provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor. The memory stores a computer program executable by the at least one processor, the computer program, when executed by the at least one processor, is for causing the electronic device to perform a method according to an embodiment of the invention.
Embodiments of the present invention also provide a non-transitory computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor of a computer, is configured to cause the computer to perform a method according to an embodiment of the present invention.
Embodiments of the present invention also provide a computer program product, including a computer program, where the computer program is used to make a computer execute the method according to the embodiments of the present invention when being executed by a processor of the computer.
As shown in fig. 4, a block diagram of a structure of an electronic device 400, which may be a server or a client of the present invention, which is an example of a hardware device that may be applied to aspects of the present invention, will now be described. Electronic device is intended to represent various forms of digital electronic computer devices, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 4, the electronic device 400 includes a computing unit 401 that can perform various appropriate actions and processes according to a computer program stored in a Read Only Memory (ROM)402 or a computer program loaded from a storage unit 408 into a Random Access Memory (RAM) 403. In the RAM 403, various programs and data required for the operation of the device 400 can also be stored. The computing unit 401, ROM 402, and RAM 403 are connected to each other via a bus 404. An input/output (I/O) interface 405 is also connected to bus 404.
A number of components in the electronic device 400 are connected to the I/O interface 405, including: an input unit 406, an output unit 407, a storage unit 408, and a communication unit 409. The input unit 406 may be any type of device capable of inputting information to the electronic device 400, and the input unit 406 may receive input numeric or character information and generate key signal inputs related to user settings and/or function controls of the electronic device. Output unit 407 may be any type of device capable of presenting information and may include, but is not limited to, a display, speakers, a video/audio output terminal, a vibrator, and/or a printer. Storage unit 408 may include, but is not limited to, magnetic or optical disks. The communication unit 409 allows the electronic device 400 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunications networks, and may include, but is not limited to, modems, network cards, infrared communication devices, wireless communication transceivers and/or chipsets, such as bluetooth devices, WiFi devices, WiMax devices, cellular communication devices, and/or the like.
Program code for implementing the methods of the present invention may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowchart and/or block diagram to be performed. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
As used herein, the terms "machine-readable medium" and "computer-readable medium" refer to any computer program product, apparatus, and/or device (e.g., magnetic discs, optical disks, memory, Programmable Logic Devices (PLDs)) used to provide machine instructions and/or data to a programmable processor, including a machine-readable medium that receives machine instructions as a machine-readable signal. The term "machine-readable signal" refers to any signal used to provide machine instructions and/or data to a programmable processor.
To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user can provide input to the computer. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), Wide Area Networks (WANs), and the Internet.
The computer system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A horizontal wind shear position determination method is characterized by comprising the following steps:
acquiring a plurality of key points of the high-altitude air pressure contour line; wherein, the interval of the adjacent key points is appointed longitude or latitude;
selecting a plurality of consecutive keypoints from the plurality of keypoints of the high-altitude barometric contour; wherein the plurality of continuous key points are any plurality of continuous key points in the high air pressure contour line;
calculating the curvature of the middle key point according to the coordinates of the continuous key points; wherein the intermediate key point is a key point among the plurality of continuous key points; the curvatures of a plurality of intermediate key points of the arbitrary plurality of continuous key points constitute the curvatures of a plurality of key points of the high air pressure contour line;
comparing curvatures of a plurality of key points of the high-altitude air pressure contour line with a preset threshold value to obtain a comparison result;
selecting a designated segment from the high air pressure contour according to the comparison result; wherein the curvatures of a plurality of key points contained in the designated segment are all larger than the predetermined threshold;
and taking the coordinate of the key point with the maximum curvature in the specified segment as the horizontal wind shear position.
2. The method of claim 1, wherein calculating the curvature of the intermediate keypoint from the coordinates of the plurality of consecutive keypoints comprises:
acquiring a first key point, a second key point and a third key point according to the continuous key points; the first key point is the middle key point, the second key point is at least one key point adjacent to one side of the middle key point, and the third key point is at least one key point adjacent to the other side of the middle key point;
determining a line segment according to the second key point and the third key point, and acquiring the slope of the line segment and the midpoint coordinate of the line segment;
calculating difference values between the coordinates of the first key point, the coordinates of the second key point and the coordinates of the third key point and the coordinates of the middle point respectively to obtain a first coordinate, a second coordinate and a third coordinate;
acquiring a rotation angle according to the slope of the line segment;
respectively performing rotation operation on the first coordinate, the second coordinate and the third coordinate by using the rotation angle to obtain a corresponding fourth coordinate, a corresponding fifth coordinate and a corresponding sixth coordinate;
fitting a designated function by using the fourth coordinate, the fifth coordinate and the sixth coordinate to obtain each parameter of the designated function;
and acquiring the curvature of the middle key point according to the parameters and the fourth coordinate.
3. The method according to claim 2, wherein performing a rotation operation on the first coordinate, the second coordinate, and the third coordinate using the rotation angle, respectively, and obtaining corresponding fourth coordinate, fifth coordinate, and sixth coordinate comprises:
respectively rotating the first coordinate, the second coordinate and the third coordinate by using the rotation angle through the following formulas to obtain a corresponding fourth coordinate, a corresponding fifth coordinate and a corresponding sixth coordinate:
the rotation angle is as follows: θ ═ arctan (k);
wherein (a3, b3) is any of the first coordinate, the second coordinate, and the third coordinate, (a4, b4) is any of the fourth coordinate, the fifth coordinate, and the sixth coordinate, k is the slope, and θ is a rotation angle.
4. The method according to claim 2, wherein fitting a specified function using the fourth coordinate, the fifth coordinate and the sixth coordinate, and obtaining parameters of the specified function comprises:
constructing a least square matrix according to the fourth coordinate, the fifth coordinate, the sixth coordinate and the designated function; wherein the least squares matrix is represented as:
B＝(ATA)-1ATY；
wherein B is a parameter matrix of the specified function, and A represents a matrix constructed by each abscissa of the fourth, fifth, and sixth coordinates in combination with the type of the specified function; a. theTA transposed matrix representing the A matrix, (A)TA)-1Representation matrix ATAn inverse matrix of a matrix formed by multiplying the matrix a, and Y denotes a matrix constructed by each of the fourth coordinate, the fifth coordinate, and the sixth coordinate in combination with the type of the specified function.
5. The method according to claim 2, wherein obtaining the curvature of the middle keypoint according to the parameters further comprises:
the specified function is a quadratic function, pass throughThe curvature of the middle key point is obtained through the parameters of the quadratic function and the fourth coordinate; wherein the quadratic function is y ═ ax2+ bx + c, the curvature calculation formula of the middle key point is:
cur represents the curvature of the middle key point, a, b and c are parameters of a quadratic function, x is an independent variable of the quadratic function, y is a dependent variable of the quadratic function, and a5 represents the abscissa of the fourth coordinate.
6. The method of claim 1, wherein selecting the specified segment from the high air pressure contour comprises:
marking a plurality of key points of the high air pressure contour line according to the comparison result;
acquiring a starting key point and an ending key point in the high-altitude air pressure contour line key points corresponding to a plurality of continuous marks; wherein the starting key point is the first key point in the high air pressure contour key points corresponding to the continuous marks, and the ending key point is the last key point in the high air pressure contour key points corresponding to the continuous marks;
and acquiring the high air pressure contour line segment between the starting key point and the ending key point on the high air pressure contour line as a designated segment.
7. A horizontal wind shear position determining apparatus, comprising:
the first acquisition module is used for acquiring a plurality of key points of the high-altitude air pressure contour line; wherein, the interval of the adjacent key points is appointed longitude or latitude;
the first selection module is used for selecting a plurality of continuous key points from a plurality of key points of the high air pressure contour line; wherein the plurality of continuous key points are any plurality of continuous key points in the high air pressure contour line;
the calculation module is used for calculating the curvature of the middle key point according to the coordinates of the continuous key points; wherein the intermediate key point is a key point among the plurality of continuous key points; the curvatures of a plurality of intermediate key points of the arbitrary plurality of continuous key points constitute the curvatures of a plurality of key points of the high air pressure contour line;
the comparison module is used for comparing the curvatures of a plurality of key points of the high-altitude air pressure contour line with a preset threshold value to obtain a comparison result;
the second selection module is used for selecting a designated segment from the high air pressure contour line according to the comparison result; wherein the curvatures of a plurality of key points contained in the designated segment are all larger than the predetermined threshold;
and the second acquisition module is used for taking the coordinates of the key point with the maximum curvature in the specified segment as the horizontal wind shear position.
8. The horizontal wind shear position determination device of claim 7, wherein the calculation module comprises:
a first obtaining unit, configured to obtain a first key point, a second key point, and a third key point according to the plurality of consecutive key points; the first key point is the middle key point, the second key point is at least one key point adjacent to one side of the middle key point, and the third key point is at least one key point adjacent to the other side of the middle key point;
the determining unit is used for determining a line segment according to the second key point and the third key point, and acquiring the slope of the line segment and the midpoint coordinate of the line segment;
the second acquisition unit is used for calculating the difference between the coordinate of the first key point, the coordinate of the second key point and the coordinate of the third key point and the coordinate of the middle point respectively to acquire a first coordinate, a second coordinate and a third coordinate;
a third obtaining unit, configured to obtain a rotation angle according to a slope of the line segment;
the rotating unit is used for respectively rotating the first coordinate, the second coordinate and the third coordinate by using the rotating angle to acquire a corresponding fourth coordinate, a corresponding fifth coordinate and a corresponding sixth coordinate;
the fitting unit is used for fitting a specified function by using the fourth coordinate, the fifth coordinate and the sixth coordinate to obtain each parameter of the specified function;
and the fourth acquisition unit is used for acquiring the curvature of the middle key point according to the parameters and the fourth coordinate.
9. An electronic device, comprising:
a processor; and
a memory for storing a program, wherein the program is stored in the memory,
wherein the program comprises instructions which, when executed by the processor, cause the processor to carry out the horizontal windshear position determination method according to any one of claims 1-6.
10. A non-transitory computer readable storage medium having stored thereon computer instructions for causing the computer to perform the horizontal wind shear position determination method according to any one of claims 1-6.
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