CN101770516A - Method for excavating tropical cyclone motion track channel - Google Patents
Method for excavating tropical cyclone motion track channel Download PDFInfo
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Abstract
The invention provides a method for excavating a tropical cyclone motion track channel, which comprises the following steps: A, segmenting the space and a tropical cyclone motion track by a grid to obtain segments of tropical cyclone motion sub-tracks; B, computing the similarity between the tropical cyclone motion sub-tracks by using the adjusted discrete Frechet distance; C, hierarchically clustering the tropical cyclone motion sub-tracks to obtain track clusters of the tropical cyclone motion sub-tracks; and D, connecting the track clusters of the tropical cyclone motion sub-tracks to obtain the tropical cyclone motion track channel. The method can effectively discover the tropical cyclone motion track channel, combines historical tropical cyclone path data to excavate the tropical cyclone motion behavior mode in specific areas, provides a direct and effective tool for analyzing and predicting typhoon disaster, and provides decision support for disaster prevention and reduction.
Description
[technical field]
The present invention relates to a kind of method for excavating tropical cyclone motion track channel.
[background technology]
Tropical cyclone is to be created on the torrid zone or the ocean surface, subtropics, has the general designation of the organized convection current and the non-sharp side property vortex of the cyclonic circulation of determining, comprises tropical depression, tropical storm, severe tropical storm, typhoon, violent typhoon and Super Typhoon.For prediction and classification tropical cyclone mobile significant meaning is arranged about the research of the mobile behavior pattern of tropical cyclone.Track channel can determine that as a kind of spatiotemporal mode of mobile object by the oriented space zone of frequent access, tropical cyclone motion track channel is the oriented space zone of being crossed by the tropical cyclone frequent access.
Data mining is to extract or excavate knowledge from mass data, and cluster analysis can be divided the large data set in groups according to the similarity of data as an important method of data mining.Cluster analysis can obtain the situation of DATA DISTRIBUTION, observes the feature of each bunch, concentrates some specific bunch is further analyzed.Clustering method can help to find effectively can connected tropical cyclone motion track bunch, and can obtain tropical cyclone motion track channel after connecting.But at different types of data, clustering method is not quite similar, and particularly for the track data type, the clustering method of invention is also quite limited at present, and have certain defective and limitation separately, one of them reason is that track data faces a similarity assessment difficult problem.
[summary of the invention]
Based on this, be necessary to provide a kind of effectively method of excavating tropical cyclone motion track channel.
A kind of method for excavating tropical cyclone motion track channel may further comprise the steps: A. grid cutting tropical cyclone motion track, obtain the sub-trajectory that tropical cyclone moves; B. utilize the similarity between the discrete Frechet distance tropical cyclone mover track of adjusting; C. hierarchical clustering tropical cyclone mover track obtains the track bunch of tropical cyclone mover track; D. connect the track bunch of tropical cyclone mover track, obtain tropical cyclone motion track channel.
Preferably, this method also comprises according to the tropical cyclone mover track that calculates, track bunch, track channel and realizes visual step.
Preferably, the step of grid cutting tropical cyclone motion track comprises in the steps A: A1. is cut into m * n grid cell by traveling through the total data point of a full track mark in order with whole plane space, the implementation space gridding, and m, n are positive integer; A2. complete tropical cyclone motion track is opened in the cutting of the border of each grid cell, formed tropical sub-trajectory, realize the segmentization of full track mark; A3. will contain the grid cell filtering of not enough number sub-trajectory.
Preferably, described cutting method is for passing through to travel through in order once all total data points of tracks, judge whether adjacent data point is present in the same mesh unit, when the consecutive number strong point is present in different grid cells, then all grid cell borders that consecutive number strong point line is passed through are cut-off, former track disconnects at the cut-off place, forms the sub-trajectory segment.
Preferably, utilize the step of the similarity between the discrete Frechet distance tropical cyclone mover track of adjusting to comprise among the step B: B1. adjusts discrete Fu Leixie distance definition: the Fu Leixie range formula will disperse
In || computing is modified to the weighted sum of space-time influence factor, for the summit of sub-trajectory to (p
i, q
j), described || computing is defined as:
B2. to the sub-trajectory in the grid cell, calculate the discrete Fu Leixie distance of adjusting in twos and obtain a distance matrix, and generate apart from concordance list by ordering.
Preferably, the step of the middle-level cluster tropical cyclone of step C mover track comprises: C1. is assigned to each sub-trajectory in the track that has nothing in common with each other bunch, from the distance concordance list, obtain two nearest sub-trajectories of current distance, if the track that exists for two sub-trajectories bunch do not comprise appoint sub-trajectory to and two tracks bunch between distance surpass setting threshold, with two track bunch merging; C2. all are not comprised the track bunch of enough sub-trajectory numbers or do not comprise the grid cell filtering of track bunch.
Preferably, the step that connects the track bunch of tropical cyclone mover track among the step D comprises: grid cell travels through in proper order, single direction is checked track bunch, traverse each grid cell, check the terminal point of existing all tracks of described grid cell bunch and other starting point at the track of adjacent mesh unit bunch; When meeting in the starting point of the track of adjacent mesh unit bunch, the terminal point of existing all tracks of grid cell bunch and other carry out the cartesian product cross connection when imposing a condition.
Preferably, impose a condition and judge at the spatial relation or the speed attribute of the starting point of the track of adjacent mesh unit bunch according to the terminal point of existing all tracks of grid cell bunch and other, when starting point and terminal attribute similar, the position near the time, be judged as and can connect.
Above-mentioned method for excavating tropical cyclone motion track channel, by grid cutting space and tropical cyclone motion track, can obtain tropical cyclone mover track segment, can effectively discern same tropical cyclone belongs to different bunches at different times situation with the sub-trajectory segment as cluster cell, with grid as operating unit, can improve counting yield and reduce computing time, be easy to parallelization and handle.
By adjusting discrete Fu Leixie distance definition, can be so that discrete Fu Leixie apart from space factors such as the relative position that can not only consider different tropical cyclones and shapes, can also consider speed equal time factor simultaneously.
Simultaneously, utilize arest neighbors cohesion hierarchical clustering pattern and be connected the influence that cluster mode that judgement combines can effectively avoid tropical cyclone mover track similarity to add up entirely.
The tropical cyclone motion track that generates by traversal bunch and adopt cartesian product to intersect can further obtain tropical cyclone global behavior behavior pattern after cluster analysis, promptly obtain tropical cyclone motion track channel.
[description of drawings]
Fig. 1 is the system framework figure of method for excavating tropical cyclone motion track channel;
Fig. 2 is the algorithm flow chart of grid cutting space and tropical cyclone motion track;
Fig. 3 is the algorithm flow chart of hierarchical clustering tropical cyclone mover track;
Fig. 4 is the algorithm flow chart that connects the track bunch of tropical cyclone mover track.
[embodiment]
Below the method for main accompanying drawings excavating tropical cyclone motion track channel.
As shown in Figure 1, the method for excavating tropical cyclone motion track channel comprises following process step:
A, grid cutting tropical cyclone motion track obtain tropical cyclone mover track segment.
At first utilize grid cutting space and tropical cyclone motion track.In space networks was formatted step, whole plane space was m * n grid cell space by cutting.In full track mark segment step, complete tropical cyclone motion track is opened by cutting on the border of each grid cell, form sub-trajectory, thereby each sub-trajectory all belongs to some definite grid cells.Cutting method judges by traveling through once all total data points of tracks in order whether adjacent data point is present in the same mesh unit, thereby whether decision carries out break-in operation.When the consecutive number strong point is present in different grid cells, all grid cell borders that consecutive number strong point line is passed through are cut-off, and former track disconnects at the cut-off place, form the sub-trajectory segment.After the cutting process, carry out the grid filtration step, the grid cell that contains not enough number sub-trajectory will be by filtering, because can not generate the track bunch that contains the sufficient amount sub-trajectory in these grid cells.Algorithm as shown in Figure 2.
Similarity between the discrete Frechet distance tropical cyclone mover track that B, utilization are adjusted.
In the part of utilizing the similarity between the discrete Frechet distance tropical cyclone mover track of adjusting, each operation all is present in the grid cell that is retained after some filterings.To all sub-trajectories in some grid cells, calculate the discrete Fu Leixie distance of adjusting in twos and obtain a distance matrix, and generate concordance list by ordering.Discrete Fu Leixie range formula is:
Wherein originally || computing is Euclidean distance or other space criteria distances.In order to consider time factor simultaneously, speed for example, || computing is corrected for space-time influence factor weighted sum.Promptly for the summit of tropical cyclone mover track to (p
i, q
j), || be defined as:
Like this, by the dynamic routine operation, can calculate the discrete Fu Leixie distance of the adjustment of sub-trajectory in twos.
C, hierarchical clustering tropical cyclone mover track obtain the track bunch of tropical cyclone mover track.
At hierarchical clustering tropical cyclone mover track, obtain the part of the track bunch of tropical cyclone mover track, each operation is present in the grid cell that some filterings are retained later equally, and set up distance matrix and apart from concordance list after.Hierarchical clustering tropical cyclone mover track comprises arest neighbors cohesion hierarchical clustering pattern, and full the connection judged and track bunch three steps of filtration.During initialization, each sub-trajectory is assigned in the track that has nothing in common with each other bunch, each two nearest sub-trajectories of current distance that from the distance concordance list, obtain, if the track that two sub-trajectories exist is bunch by judging full the binding, promptly not comprising in two tracks bunch appoints sub-trajectory right, its distance surpasses a certain preset threshold, and then these two tracks bunch will merge.Express some stop conditions up to the distance index, then no longer carry out cluster.This cluster finally obtains more suitable track bunch size by successively merging adjacent clusters, judges by full binding, and the error of the hierarchical clustering that can effectively avoid distance to add up causing is excessive.At last all do not comprise the track of abundant sub-trajectory number bunch will be by filtering, the filtering condition of cutting track part before this filtering condition is equal to.The grid cell that does not comprise simultaneously track bunch also will be further by filtering.Algorithm as shown in Figure 3.
D, connect the track bunch of tropical cyclone mover track, obtain tropical cyclone motion track channel.
At the track that connects tropical cyclone mover track bunch, obtain in the part of tropical cyclone motion track channel, only once travel through and get final product for those grid cells that comprise track bunch.This part comprises that grid cell travels through in proper order, and single direction is checked track bunch and two steps of cartesian product cross connection.When traversing each grid cell, check the terminal point of existing all tracks of this grid cell bunch, if there are other starting points at the track of adjacent mesh unit bunch to be connected with it, the intersection of then carrying out cartesian product links entirely.This method can only travel through once all grid cells, and only judges the terminal point of the track bunch in each grid, can obtain the track channel that might exist.The spatial relation that can connect judgment basis track bunch origin and destination, speed attribute etc. judge, and be similar with terminal attribute when starting point, when the position is close, is judged as and can connects.Algorithm as shown in Figure 4.
E, realize visual according to the tropical cyclone mover track that calculates, track bunch, track channel.
Visual software can show the complete motion track of tropical cyclone, the sub-trajectory that obtains after the cutting, and the track after the cluster bunch and be connected track channel afterwards.Variable element comprises: the filtering condition, the cluster end condition links judgment basis entirely, grid cell size, the space-time weight ratio in the discrete Fu Leixie distance of adjustment.
Above-mentioned method for excavating tropical cyclone motion track channel by grid cutting space and tropical cyclone motion track, obtains tropical cyclone mover track segment; Utilize the similarity between the discrete Frechet distance tropical cyclone mover track of adjusting; Hierarchical clustering tropical cyclone mover track obtains the track bunch of tropical cyclone mover track; Connect the track bunch of tropical cyclone mover track, obtain tropical cyclone motion track channel; According to the tropical cyclone mover track that calculates, track bunch, track channel is realized visual.Finally can quantize and visual all tropical cyclone motion track channels that obtain, this passage is for the research tropical cyclone motion track, and prediction and prevention tropical cyclones influence play an important role.
Method for excavating tropical cyclone motion track channel provided by the invention is based on data mining technology, obtain reliable and have the tropical cyclone Move Mode of sufficient accuracy, the prediction and the prevention that will be meteorological research, particularly tropical cyclone provide one to grasp the overall situation and the auxiliary instrument of decision-making.Analyse in depth tropical cyclone motion track and can reduce the particularly loss of the people's lives and properties that cause of typhoon of tropical cyclone, farthest deduction and exemption national economy loss simultaneously.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. a method for excavating tropical cyclone motion track channel is characterized in that, may further comprise the steps:
A. grid cutting tropical cyclone motion track obtains the sub-trajectory that tropical cyclone moves;
B. utilize the similarity between the discrete Frechet distance tropical cyclone mover track of adjusting;
C. hierarchical clustering tropical cyclone mover track obtains the track bunch of tropical cyclone mover track;
D. connect the track bunch of tropical cyclone mover track, obtain tropical cyclone motion track channel.
2. method for excavating tropical cyclone motion track channel as claimed in claim 1 is characterized in that, also comprises according to the tropical cyclone mover track that calculates, track bunch, track channel realizing visual step.
3. method for excavating tropical cyclone motion track channel according to claim 1 and 2 is characterized in that, the step of grid cutting tropical cyclone motion track comprises in the described steps A:
A1. by traveling through the total data point of a full track mark in order, whole plane space is cut into m * n grid cell, the implementation space gridding, m, n are positive integer;
A2. complete tropical cyclone motion track is opened in the cutting of the border of each grid cell, formed tropical sub-trajectory, realize the segmentization of full track mark;
A3. will contain the grid cell filtering of not enough number sub-trajectory.
4. method for excavating tropical cyclone motion track channel according to claim 3, it is characterized in that, described cutting method is for passing through to travel through in order once all total data points of tracks, judge whether adjacent data point is present in the same mesh unit, when the consecutive number strong point is present in different grid cells, then all grid cell borders that consecutive number strong point line is passed through are cut-off, and former track disconnects at the cut-off place, form the sub-trajectory segment.
5. method for excavating tropical cyclone motion track channel according to claim 1 and 2 is characterized in that, utilizes the step of the similarity between the discrete Frechet distance tropical cyclone mover track of adjusting to comprise among the described step B:
B1. adjust discrete Fu Leixie distance definition: the Fu Leixie range formula will disperse
In || computing is modified to the weighted sum of space-time influence factor, for the summit of sub-trajectory to (p
i, q
j), described || computing is defined as:
B2. to the sub-trajectory in the grid cell, calculate the discrete Fu Leixie distance of adjusting in twos and obtain a distance matrix, and generate apart from concordance list by ordering.
6. method for excavating tropical cyclone motion track channel according to claim 1 and 2 is characterized in that, the step of the middle-level cluster tropical cyclone of described step C mover track comprises:
C1. each sub-trajectory is assigned in the track that has nothing in common with each other bunch, from the distance concordance list, obtain two nearest sub-trajectories of current distance, if the track that exists for two sub-trajectories bunch do not comprise appoint sub-trajectory to and two tracks bunch between distance surpass setting threshold, with two track bunch merging;
C2. all are not comprised the track bunch of enough sub-trajectory numbers or do not comprise the grid cell filtering of track bunch.
7. method for excavating tropical cyclone motion track channel according to claim 1 and 2, it is characterized in that, the step that connects the track bunch of tropical cyclone mover track among the described step D comprises: grid cell travels through in proper order, single direction is checked track bunch, traverse each grid cell, check the terminal point of existing all tracks of described grid cell bunch and other starting point at the track of adjacent mesh unit bunch; When meeting in the starting point of the track of adjacent mesh unit bunch, the terminal point of existing all tracks of grid cell bunch and other carry out the cartesian product cross connection when imposing a condition.
8. method for excavating tropical cyclone motion track channel according to claim 7, it is characterized in that, described imposing a condition judged at the spatial relation or the speed attribute of the starting point of the track of adjacent mesh unit bunch according to the terminal point of existing all tracks of grid cell bunch and other, when described starting point and described terminal attribute similar, the position near the time, be judged as and can connect.
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| CN101933448A (en) * | 2010-07-26 | 2011-01-05 | 北京师范大学 | Method for manufacturing tropical cyclone wind zone |
| CN102122005A (en) * | 2010-12-20 | 2011-07-13 | 福建四创软件有限公司 | GIS-based spatial analysis and application method for similar paths of typhoon |
| CN102132662A (en) * | 2011-01-10 | 2011-07-27 | 北京师范大学 | Improved method for making tropical cyclone wind zone |
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| CN102132662B (en) * | 2011-01-10 | 2012-10-17 | 北京师范大学 | Improved method for making tropical cyclone wind zone |
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| CN111753906A (en) * | 2020-06-24 | 2020-10-09 | 中科三清科技有限公司 | Method and device for clustering pollutant transmission tracks, electronic equipment and storage medium |
| CN111898815A (en) * | 2020-07-21 | 2020-11-06 | 中远海运科技(北京)有限公司 | Typhoon track prediction method and device, electronic equipment and computer readable medium |
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