CN108230423A - A kind of method for drafting of the isobar air pressure line of rabbet joint and crestal line - Google Patents
A kind of method for drafting of the isobar air pressure line of rabbet joint and crestal line Download PDFInfo
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- CN108230423A CN108230423A CN201810005476.2A CN201810005476A CN108230423A CN 108230423 A CN108230423 A CN 108230423A CN 201810005476 A CN201810005476 A CN 201810005476A CN 108230423 A CN108230423 A CN 108230423A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/20—Drawing from basic elements, e.g. lines or circles
- G06T11/206—Drawing of charts or graphs
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/20—Drawing from basic elements, e.g. lines or circles
- G06T11/203—Drawing of straight lines or curves
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30181—Earth observation
- G06T2207/30192—Weather; Meteorology
Abstract
The present invention relates to a kind of isobar air pressure line of rabbet joint and the method for drafting of crestal line, including step：Judge whether isobar is closed curve, if then by chord contact method extraction tank point and ridge point, otherwise according to isobar present position extraction tank point and ridge point；Tracking slot point and ridge point simultaneously connect out the line of rabbet joint and crestal line.In the present invention, the slot point of field of pressure isopleth and ridge point extraction have been tested based on chord contact method, and unique slot point and ridge point bus connection method is proposed according to least square curve fit algorithm, achieved the preferable line of rabbet joint and crestal line automatic identification result.The line of rabbet joint and crestal line connection result page meet weather system slot, crestal line analysis requirement, can the preferably trend of reactive tank point and ridge point, result of the test shows that the algorithm can complete the weather system line of rabbet joint and crestal line automatically analyzes identification.
Description
Technical field
The present invention relates to weather circulation figure automated analysis technical fields, and in particular to a kind of isobar air pressure line of rabbet joint and ridge
The method for drafting of line.
Background technology
Upper-level weather chart is to analyze Altitude acclimatization and the upper air meteorology data of atmospheric condition.It is represented in high-altitude
The method of weather situation, the general gas pressure distribution without on level altitude, but in the equal isobaris surface weather map of an air pressure
Reward, analyzes the rough situation in this face.Upper-level weather chart analysing content mainly include contour, thermoisopleth, line of rabbet joint crestal line,
Shear line etc..
In meteorology, the line of rabbet joint refer in trough isobar cyclonic curvature it is maximum and with barometric minimum (or potential
Highly) the line of each point；Crestal line refers in the identical plane of height above sea level, air pressure height and adjoin three faces and less than the region of another side,
It is often the elongated zones that hyperbar extends out.It is the important interior of weather circulation figure automated analysis that line of rabbet joint crestal line, which automatically analyzes,
Hold, for the analysis of the present weather system line of rabbet joint mainly by manually realizing, slot can accurately be judged at present by not yet existing
The method of line and crestal line.
Invention content
The technical problems to be solved by the invention are to provide the method for drafting of a kind of isobar air pressure line of rabbet joint and crestal line, more
Accurately draw the line of rabbet joint and crestal line in weather system.
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of drafting side of the isobar air pressure line of rabbet joint and crestal line
Method includes the following steps：
S1, judge whether isobar is closed curve, if then entering step S2, otherwise enter step S3；
S2, pass through chord contact method extraction tank point and ridge point；
S3, according to isobar present position extraction tank point and ridge point；
S4, the tracking slot point and ridge point simultaneously connect out the line of rabbet joint and crestal line.
Based on the above technical solution, the present invention can also be improved as follows.
Further, judge whether isobar is that the method for closed curve is in the step S1：Find out isobaric starting point
And terminal, and judge whether 2 points of longitudes and latitudes in weather system are identical, it is closed curve if identical, if different is non-
Closed curve.
Further, the step S2 specifically includes following steps：
S21, it determines isobaric starting point A and terminal B, connects A points and B points, find on isobar apart from straight line AB most
It is big to hang down away from point C1, make C1 points to the vertical line of line correspondence AB and hand over straight line AB in H1 points；
S22, A points and C1 points, B points and C1 points are connected respectively, find the maximum on isobar apart from straight line AC1 and hang down away from point
C2 and maximum apart from straight line BC1 are hung down away from point C3, make C2 points to the vertical line of line correspondence AC1 and straight line AC1 is handed over to make in H2 points
C3 points to line correspondence BC1 vertical line and hand over straight line BC1 in H3 points；
S23, by step S22 iteration 4 times, find it is maximum hang down away from point C1 points, C2 points, C3 points ..., C31 points；
S24, make it is maximum hang down away from point C1 points, C2 points, C3 points ..., the vertical lines of C31 points to line correspondence and hand over line correspondence in
H1 points, H2 points, H3 points ..., H31 points, obtain vertical line section C1H1, C2H2, C3H3 ..., C31H31；
S25, when vertical line section C1H1, C2H2, C3H3 ..., the length of C31H31 be more than 3, then it is maximum to hang down away from point C1 points, C2
Point, C3 points ..., C31 points be Local Extremum.
S26,2 point N10 points and N11 points before and after Local Extremum C1 points are chosen, makees Local Extremum on straight line N10N11
Intersection point D1, obtain vectorWhenWithGradient direction angle be less than or equal to 45 ° when, extraction C1 points be
Ridge point, whenWithGradient direction angle when being more than 45 °, extraction C1 points are slot point.
S27, step S26 is repeated, until all Local Extremums are extracted as ridge point or slot point.
Further, the step S3 specifically includes following steps：
S31, judge in the closed curve whether be low-pressure area, if then entering step S32, otherwise enter step S33；
The point of S32, extraction positioned at the closed curve southernmost end is slot point；
S33, extraction be located at the closed curve northernmost, most the east, westernmost end point be ridge point.
Further, the step S4 specifically includes following steps：
S41, all slot point of traversal or ridge point, when slot point or ridge point satisfaction birds of the same feather flock together condition, by the slot point for the condition that meets
Or ridge point is sorted out；
S42, the slot sorted out point is fitted to by the line of rabbet joint using least square method, the ridge point sorted out is fitted to crestal line；
S43, step S41 and S42 are repeated, until having traversed all slot points and ridge point.
Further, the condition of birdsing of the same feather flock together in the step S41 is：Number positioned at different isobars, cluster point is more than 3
Next point that is a, each putting is located on the south the point and the distance between the point and next point are less than 16.
The beneficial effects of the invention are as follows：In the present invention, the slot point and ridge of field of pressure isopleth have been tested based on chord contact method
Point extraction, and proposes unique slot point and ridge point bus connection method according to least square curve fit algorithm, achieve compared with
The good line of rabbet joint and crestal line automatic identification result.The line of rabbet joint and crestal line connection result also comply with the weather system line of rabbet joint and crestal line analysis will
It asks, preferably the trend of reactive tank point and ridge point, result of the test can show that the algorithm can complete weather system slot well
Line and crestal line automatically analyze identification.
Description of the drawings
Fig. 1 is general flow chart of the present invention；
Fig. 2 is the flow chart of step S2 of the present invention；
Fig. 3 is the flow chart of step S3 of the present invention；
Fig. 4 is the flow chart of step S4 of the present invention；
Fig. 5 is extraction tank point of the present invention and the schematic diagram of ridge point；
Fig. 6 is present invention fitting slot point and the schematic diagram of ridge point.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in Figure 1, the method for drafting of a kind of isobar air pressure line of rabbet joint and crestal line, includes the following steps：
S1, judge whether isobar is closed curve, if then entering step S2, otherwise enter step S3.
Judge whether isobar is that the method for closed curve is in step S1：Isobaric beginning and end is found out, and is sentenced
Whether the 2 points of longitudes and latitudes in weather system that break are identical, are closed curve if identical, if different is non-closed curve.
S2, pass through chord contact method extraction tank point and ridge point.
As shown in Fig. 2, step S2 specifically includes following steps：
S21, it determines isobaric starting point A and terminal B, connects A points and B points, find on isobar apart from straight line AB most
It is big to hang down away from point C1, make C1 points to the vertical line of line correspondence AB and hand over straight line AB in H1 points.
In embodiments of the present invention, maximum hang down accomplishes the vertical line and vertical line distance of straight line AB away from point C1 for the point on isobar
Maximum point.
S22, A points and C1 points, B points and C1 points are connected respectively, find the maximum on isobar apart from straight line AC1 and hang down away from point
C2 and maximum apart from straight line BC1 are hung down away from point C3, make C2 points to the vertical line of line correspondence AC1 and straight line AC1 is handed over to make in H2 points
C3 points to line correspondence BC1 vertical line and hand over straight line BC1 in H3 points.
4 S23, iteration step S22, find it is maximum hang down away from point C1 points, C2 points, C3 points ..., C31 points.
S25, when vertical line section C1H1, C2H2, C3H3 ..., the length of C31H31 be more than 3 when, then it is maximum to hang down away from point C1 points, C2
Point, C3 points ..., C31 points be Local Extremum.
S26,2 point N10 points and N11 points before and after Local Extremum C1 points are chosen, makees Local Extremum on straight line N10N11
Intersection point D1, obtain vectorWhenWithGradient direction angle be less than or equal to 45 ° when, extraction C1 points be
Ridge point, whenWithGradient direction angle when being more than 45 °, extraction C1 points are slot point.
S27, step S26 is repeated, until all Local Extremums are extracted as ridge point or slot point.
As shown in figure 5, (a) is the slot point and ridge point schematic diagram that flat-cut once extracts, (b) is the slot point of flat-cut second extraction
With ridge point schematic diagram, (c) is the slot point and ridge point schematic diagram that flat-cut extracts three times, and (d) is the slot point and ridge of four extractions of flat-cut
Point schematic diagram, (e) are slot points and ridge point schematic diagram of the extraction of flat-cut five times, it can be found that flat-cut four times finally obtains for five times with flat-cut
Slot point and ridge point it is basically identical, thus, flat-cut is for five times the best flat-cut number of this method, the slot point and ridge of acquisition
Point is the most accurate.
S3, according to isobar present position extraction tank point and ridge point.
As shown in figure 3, step S3 specifically includes following steps：
S31, judge in the closed curve whether be low-pressure area, if then entering step S32, otherwise enter step S33.
The point of S32, extraction positioned at the closed curve southernmost end is slot point.
S33, extraction be located at the closed curve northernmost, most the east, westernmost end point be ridge point.
S4, tracking slot point and ridge point simultaneously connect out the line of rabbet joint and crestal line.
As shown in figure 4, step S4 specifically includes following steps：
All slot points (or ridge point) of S41, traversal, when slot point (or ridge point) meets positioned at different isobars, cluster point
Number be more than 3, next point for each putting is located on the south the point and the distance between the point and next point are less than 16, general
The slot point (or ridge point) for meeting condition is sorted out.
S42, the slot sorted out point is fitted to by the line of rabbet joint using least square method, the ridge point sorted out is fitted to crestal line.
As shown in fig. 6, using least square fitting curve, least square method can make all slot points (or ridge point) to curve
Range deviation and minimum, the line of rabbet joint (or crestal line) is set as an One- place 2-th Order function curve：Y=a0+a1x+a2x2, slot point
The coordinate of (or ridge point) is Pi=(xi,yi), it is y=φ (x to enable the line of rabbet joint (or crestal line)i) so that the line of rabbet joint (or crestal line) and y=φ
(xi) deviation it is minimum, the line of rabbet joint (or crestal line) is in PiThe deviation at place isI=1,2,3 ..., m, wherein
M is the number of the slot point (or ridge point) for the condition that meets.A0, a1 and a2 can be calculated by formula (1), and draw the line of rabbet joint (or ridge
Line).
S43, step S41 and S42 are repeated, until having traversed all slot points and ridge point.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (6)
1. the method for drafting of a kind of isobar air pressure line of rabbet joint and crestal line, which is characterized in that include the following steps：
S1, judge whether isobar is closed curve, if then entering step S2, otherwise enter step S3；
S2, pass through chord contact method extraction tank point and ridge point；
S3, according to isobar present position extraction tank point and ridge point；
S4, the tracking slot point and ridge point simultaneously connect out the line of rabbet joint and crestal line.
2. the method for drafting of the isobar air pressure line of rabbet joint according to claim 1 and crestal line, which is characterized in that the step S1
It is middle to judge whether isobar is that the method for closed curve is：Isobaric beginning and end is found out, and judges at 2 points in weather system
Whether the longitude and latitude in system is identical, is closed curve if identical, if different is non-closed curve.
3. the method for drafting of the isobar air pressure line of rabbet joint according to claim 1 and crestal line, which is characterized in that the step S2
Specifically include following steps：
S21, it determines isobaric starting point A and terminal B, connects A points and B points, find the maximum on isobar apart from straight line AB and hang down
Away from point C1, make C1 points to the vertical line of line correspondence AB and hand over straight line AB in H1 points；
S22, A points and C1 points, B points and C1 points are connected respectively, find the maximum on isobar apart from straight line AC1 hang down away from point C2 and away from
Maximum from straight line BC1 is hung down away from point C3, is made C2 points to the vertical line of line correspondence AC1 and is handed over straight line AC1 in H2 points, make C3 points to pair
It answers the vertical line of straight line BC1 and hands over straight line BC1 in H3 points；
S23, by step S22 iteration 4 times, find it is maximum hang down away from point C1 points, C2 points, C3 points ..., C31 points；
S24, make it is maximum hang down away from point C1 points, C2 points, C3 points ..., the vertical lines of C31 points to line correspondence and hand over line correspondence in H1
Point, H2 points, H3 points ..., H31 points, obtain vertical line section C1H1, C2H2, C3H3 ..., C31H31；
S25, when vertical line section C1H1, C2H2, C3H3 ..., the length of C31H31 be more than 3 when, then it is maximum hang down away from point C1 points, C2 points,
C3 points ..., C31 points be Local Extremum.
S26,2 point N10 points and N11 points before and after Local Extremum C1 points are chosen, makees Local Extremum hanging down on straight line N10N11
Sufficient D1, obtains vectorWhenWithGradient direction angle when being less than or equal to 45 °, extraction C1 points are ridge
Point, whenWithGradient direction angle when being more than 45 °, extraction C1 points are slot point.
S27, step S26 is repeated, until all Local Extremums are extracted as ridge point or slot point.
4. the method for drafting of the isobar air pressure line of rabbet joint according to claim 1 and crestal line, which is characterized in that the step S3
Specifically include following steps：
S31, judge in the closed curve whether be low-pressure area, if then entering step S32, otherwise enter step S33；
The point of S32, extraction positioned at the closed curve southernmost end is slot point；
S33, extraction be located at the closed curve northernmost, most the east, westernmost end point be ridge point.
5. the method for drafting of the isobar air pressure line of rabbet joint according to claim 1 and crestal line, which is characterized in that the step S4
Specifically include following steps：
S41, all slot point of traversal or ridge point, when slot point or ridge point satisfaction birds of the same feather flock together condition, by the slot point or ridge of the condition that meets
Point is sorted out；
S42, the slot sorted out point is fitted to by the line of rabbet joint using least square method, the ridge point sorted out is fitted to crestal line；
S43, step S41 and S42 are repeated, until having traversed all slot points and ridge point.
6. the method for drafting of the isobar air pressure line of rabbet joint according to claim 5 and crestal line, which is characterized in that the step
The condition of birdsing of the same feather flock together in S41 is：The next point for be more than 3 positioned at the number of different isobars, cluster point, each putting is located at should
On the south point and the distance between the point and next point are less than 16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810005476.2A CN108230423B (en) | 2018-01-03 | 2018-01-03 | Drawing method for groove line and ridge line of isobaric line pressure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810005476.2A CN108230423B (en) | 2018-01-03 | 2018-01-03 | Drawing method for groove line and ridge line of isobaric line pressure |
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| CN108230423A true CN108230423A (en) | 2018-06-29 |
| CN108230423B CN108230423B (en) | 2021-03-30 |
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Cited By (5)
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| CN109102538A (en) * | 2018-07-17 | 2018-12-28 | 成都信息工程大学 | Method, the synoptic analysis method of piston ring land characteristic point and land features line are extracted using isopleth data |
| CN109239809A (en) * | 2018-08-02 | 2019-01-18 | 成都信息工程大学 | A kind of weather piston ring land line drawing method based on chord contact method |
| CN112991489A (en) * | 2021-04-07 | 2021-06-18 | 中科三清科技有限公司 | Isobaric line drawing method and device, electronic equipment and storage medium |
| CN113486845A (en) * | 2021-07-26 | 2021-10-08 | 中科三清科技有限公司 | Weather identification method and device, electronic equipment and storage medium |
| CN114565057A (en) * | 2022-03-15 | 2022-05-31 | 中科三清科技有限公司 | Machine learning-based grading field identification method and device, storage medium and terminal |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109102538A (en) * | 2018-07-17 | 2018-12-28 | 成都信息工程大学 | Method, the synoptic analysis method of piston ring land characteristic point and land features line are extracted using isopleth data |
| CN109102538B (en) * | 2018-07-17 | 2020-09-29 | 成都信息工程大学 | Method for extracting land characteristic points and land characteristic lines by using contour line data and weather map analysis method |
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| CN109239809B (en) * | 2018-08-02 | 2021-03-16 | 成都信息工程大学 | Weather land line extraction method based on chordal cutting method |
| CN112991489A (en) * | 2021-04-07 | 2021-06-18 | 中科三清科技有限公司 | Isobaric line drawing method and device, electronic equipment and storage medium |
| CN112991489B (en) * | 2021-04-07 | 2021-11-05 | 中科三清科技有限公司 | Isobaric line drawing method and device, electronic equipment and storage medium |
| CN113486845A (en) * | 2021-07-26 | 2021-10-08 | 中科三清科技有限公司 | Weather identification method and device, electronic equipment and storage medium |
| CN113486845B (en) * | 2021-07-26 | 2022-04-29 | 中科三清科技有限公司 | Weather identification method and device, electronic equipment and storage medium |
| CN114565057A (en) * | 2022-03-15 | 2022-05-31 | 中科三清科技有限公司 | Machine learning-based grading field identification method and device, storage medium and terminal |
| CN114565057B (en) * | 2022-03-15 | 2022-10-21 | 中科三清科技有限公司 | Machine learning-based grading field identification method and device, storage medium and terminal |
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