CN101901551A - Method for optimizing track playback function in vehicle monitoring system - Google Patents
Method for optimizing track playback function in vehicle monitoring system Download PDFInfo
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Abstract
The invention discloses a method for optimizing a track playback function in a vehicle monitoring system, which comprises the following steps of: (1) determining the original track point data to be processed by the track playback function; (2) acquiring the border and the measuring scale of the current map window; (3) judging whether the original track points are in the current map window according to the border of the current map window, and adding a flag bit in the window and the change state information relative to the previous track point to the original track point data; (4) adding a point plotting flag bit to each original track point, and determining whether the track point needs to be plotted by comparing the distance between the original track points with one threshold value; (5) adding a line plotting flag bit to each original track point, and determining whether the track point needs to be plotted according to the change state information; and (6) plotting the track points an a track line. The invention greatly improves the performance of track playback, and can respond use operations in time.
Description
Technical field
The present invention relates to a kind of optimization method, particularly relate to the optimization method of track playback function in a kind of vehicle monitoring system.
The background skill originally
WebGIS is the product that the Internet technology is applied to GIS (Geographic Information System, Geographic Information System) exploitation.GIS is expanded by the WWW function, really becomes a kind of popular instrument that uses.The WebGIS vehicle monitoring system is an oversize vehicle information monitoring platform that is implemented in Internet, has merged gps satellite location technology, GPRS/GSM wireless communication technique and WebGIS network geographic information system technology.The user can by the IE browser on electronic chart to information such as the geographic position of vehicle, speed, travel direction, vehicle-state monitor in real time, trace playback and information inquiry.Utilize the spatial analysis functions of WebGIS can also carry out the aid decision making support of vehicle scheduling, thereby realize scientific and reasonable monitoring and scheduling management, improve car operation efficient.
Track playback function can reappear the historical transport condition of vehicle as a critical function of WebGIS vehicle monitoring system on electronic chart, for various types of analysis managements provide the support of an intuitive visualization information.On the implementation of foreground, because plug-in type WebGIS needs this fatal shortcoming of user installation plug-in unit, can't satisfy the requirement of numerous WebGIS projects, therefore the WebGIS of present domestic main flow uses the javascript language to carry out the foreground exploitation mostly.Because the javascript language is an interpreted languages; can't reach the level of the speech like sound of C or JAVA at aspect of performance; therefore when needing to handle mass data in the trace playback; the vehicle monitoring system arithmetic speed is slower; can't in time respond user's operation, have a strong impact on the interactivity of vehicle monitoring system.
Summary of the invention
Technical matters to be solved by this invention provides the optimization method of track playback function in a kind of vehicle monitoring system, and it has significantly promoted the performance of trace playback, and can in time respond user's operation.
The present invention solves above-mentioned technical matters by following technical proposals: the optimization method of track playback function in a kind of vehicle monitoring system is characterized in that it may further comprise the steps:
Step 2, the border that obtains current map window and engineer's scale, border are used to filter the outer initial trace point of current map window, and engineer's scale is used to calculate the distance between the initial trace point and filters initial trace the point overlapping or next-door neighbour;
Step 6, carry out the drafting of tracing point and trajectory according to the initial trace point data after filtering.
Preferably, described track playback function is to carry out visualization display on the trajectory that simulating vehicle travels and the electronic chart that is added to by tracing point.
Preferably, the border of the longitude of original tracing point, latitude and current map window compares in the described step 3, determines this tracing point whether in current map window, if in current map window, then the mark position is one in the window; If outside current map window, then the mark position is zero in the window.
Preferably, described step 6 is carried out the drafting of tracing point and trajectory according to some drawing zone bit in the step 5 and line drawing zone bit.
Positive progressive effect of the present invention is: the present invention promotes at least more than the twice track render speed, and when user's continued operation map, the vehicle monitoring system operation is smooth, does not have obviously sluggish sense, has improved user's operating efficiency greatly.
Description of drawings
Fig. 1 is the process flow diagram of one embodiment of the invention.
Fig. 2 is the synoptic diagram of the particular location relation of initial trace point of the present invention.
Fig. 3 shows the synoptic diagram of final drawing effect to the optimization of track for the present invention.
Fig. 4 is without the trace playback display effect synoptic diagram of optimizing.
Fig. 5 is the trace playback display effect synoptic diagram after optimizing.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
The present invention is the optimization method of track playback function in a kind of vehicle monitoring system, its ultimate principle is: judge that by the map window border tracing point is whether in window, filter out the tracing point outside window, and increase zone bit in window and with respect to the variable condition information of previous tracing point for each tracing point; And then passing ratio chi calculating tracing point distance, filter out the tracing point overlapping or next-door neighbour, and increase the tracing point that some drawing zone bit need to determine drafting; Pass through the definite node that needs the trajectory of drafting of variable condition information at last, and be that each tracing point increases line drawing zone bit.
As shown in Figure 1, the optimization method of track playback function may further comprise the steps in the vehicle monitoring system of the present invention:
Determine the initial trace point data that the track playback function needs are handled according to user's actual need.For example, the user needs the track of vehicle of playback to be made up of first tracing point (Pt1) to the tenth tracing point (Pt10) ten tracing points altogether, each tracing point is represented the geographic position by longitude and latitude, and then above-mentioned ten tracing points are formed initial trace point data as shown in table 1.
| The track period | Longitude and latitude (lon, lat) |
| Pt1 | (120.8，31.7) |
| Pt2 | (121.1，31.6) |
| Pt3 | (121.3，31.3) |
| Pt4 | (121.4，31.3) |
| Pt5 | (121.6，30.9) |
| Pt6 | (121.8，30.8) |
| Pt7 | (121.9，30.8) |
| Pt8 | (121.8，31.3) |
| Pt9 | (121.7，31.7) |
| Pt10 | (121.5，32.1) |
Table 1
Step 2 is obtained the border and the engineer's scale of current map window.
Track playback function is to carry out visualization display on the trajectory that simulating vehicle travels and the electronic chart that is added to by tracing point.And move or convergent-divergent map window when checking track as the user; often some tracing point can be in outside the current map window; or some tracing point location overlap or next-door neighbour, for track playback function is carried out the optimization of performance and display effect, need carry out screening and filtering to these tracing points.In this step 2, the border that obtains current map window is used to filter the outer initial trace point of current map window, and the engineer's scale that obtains current map window is used to calculate the distance between the initial trace point and filters initial trace the point overlapping or next-door neighbour.In this example, the screen resolution of supposing current map window is a 400*400 (unit: pixel), map boundary line is the lower left corner (121,31), the upper right corner (122,32), then according to resolution and border we can be according to calculating engineer's scale, 1 degree of longitude equals 400 pixels, 1 degree of latitude also equals 400 pixels.The particular location of initial trace point relation as shown in Figure 2, the current map window of box indicating wherein.
In this step 3, the border of longitude, latitude (longitude and latitude) and current map window by initial trace point compares, and determines this tracing point whether in current map window, if in current map window, then the mark position is 1 in the window; If outside current map window, then the mark position is 0 in the window.And variable condition information is divided into four kinds of states altogether, utilizes the interior zone bit of window of last tracing point and current tracing point to judge that decision rule is as follows:
(1) zone bit equals 0 in the window of last tracing point, and zone bit equals 1 in the window of current tracing point, represents that current tracing point enters current map window;
(2) zone bit equals 0 in the window of last tracing point, and zone bit equals 0 in the window of current tracing point, represents that current tracing point continues outside current map window;
(3) zone bit equals 1 in the window of last tracing point, and zone bit equals 0 in the mouth of current tracing point window, represents that current tracing point leaves current map window;
(4) zone bit equals 1 in the window of last tracing point, and zone bit equals 1 in the window of current tracing point, represents that current tracing point continues in current map window;
Wherein, zone bit is defaulted as 0 in the window of the last tracing point of first tracing point (Pt1).
After all initial trace point data are handled, obtain tracing point data as shown in table 2.
| The track period | Longitude and latitude (lon, lat) | Zone bit in the window | Variable condition information |
| Pt1 | (120.8，31.7) | 0 | Continue outside window |
| Pt2 | (121.1，31.6) | 1 | Enter window |
| Pt3 | (121.3，31.3) | 1 | Continue in window |
| Pt4 | (121.4，31.3) | 1 | Continue in window |
| Pt5 | (121.6，30.9) | 0 | Leave window |
| Pt6 | (121.8，30.8) | 0 | Continue outside window |
| Pt7 | (121.9，30.8) | 0 | Continue outside window |
| Pt8 | (121.8，31.3) | 1 | Enter window |
| Pt9 | (121.7，31.7) | 1 | Continue in window |
| Pt10 | (121.5，32.1) | 0 | Leave window |
Table 2
This step 4 further is optimized screening to the initial trace point data, filters the tracing point overlapping and next-door neighbour, final definite drawn initial trace point that needs.Preestablish a threshold values D (unit: pixel) for this reason, then according to first tracing point (Pt1) to the order of the tenth tracing point (Pt10) tracing point decision-point drawing zone bit successively, the tracing point that 0 expression filters out, do not need to draw, the tracing point that 1 expression keeps, need to draw, decision rule has following 2 points:
When (1) variable condition information was not for " continuing in window ", some drawing zone bit was consistent with zone bit in the window.
When (2) variable condition information is for " continuing in window ", carry out the threshold values comparison, calculate the screen distance between current point and " graphical pointv recently " (the last some drawing zone bit is defined as 1 tracing point promptly), when distance during more than or equal to threshold values D, point drawing mark position is 1, when distance during less than threshold values D, some drawing mark position is 0.
In this example, variable condition information has only the 3rd tracing point (Pt3), the 4th tracing point (Pt4), three tracing points of the 9th tracing point (Pt9) for " continuing in window ", therefore only need these three tracing points are carried out the threshold values comparison, suppose threshold values is made as 50 pixels, so at first judge the 3rd tracing point (Pt3), its " graphical pointv recently " is second tracing point (Pt2), the screen distance that calculates between the 3rd tracing point (Pt3) and second tracing point (Pt2) is 144.22 pixels, greater than threshold values D, some drawing mark position is 1; Judge the 4th tracing point (Pt4) then, its nearest graphical pointv is the 3rd tracing point (Pt3), and the screen distance that calculates between the 4th tracing point (Pt4) and the 3rd tracing point (Pt3) is 40 pixels, and less than threshold values D, some drawing mark position is 0; Judge the 9th tracing point (Pt9) at last, its nearest graphical pointv is the 8th tracing point (Pt8), and the screen distance that calculates between the 9th tracing point (Pt9) and the 8th tracing point (Pt8) is 164.92 pixels, and greater than threshold values D, some drawing mark position is 1.
Final definite need to draw second tracing point (Pt2), the 3rd tracing point (Pt3), the 8th tracing point (Pt8) and four tracing points of the 9th tracing point (Pt9), concrete numerical value is as shown in table 3.
| The track period | Longitude and latitude (lon, lat) | Zone bit in the window | Variable condition information | Point drawing zone bit |
| Pt1 | (120.8，31.7) | 0 | Continue outside window | 0 |
| Pt2 | (121.1，31.6) | 1 | Enter |
1 |
| Pt3 | (121.3，31.3) | 1 | Continue in |
1 |
| Pt4 | (121.4，31.3) | 1 | Continue in window | 0 |
| Pt5 | (121.6，30.9) | 0 | Leave window | 0 |
| Pt6 | (121.8，30.8) | 0 | Continue outside window | 0 |
| Pt7 | (121.9，30.8) | 0 | Continue outside window | 0 |
| Pt8 | (121.8，31.3) | 1 | Enter |
1 |
| Pt9 | (121.7，31.7) | 1 | Continue in |
1 |
| Pt10 | (121.5，32.1) | 0 | Leave window | 0 |
Table 3
Determined in the last step that second tracing point (Pt2), the 3rd tracing point (Pt3), the 8th tracing point (Pt8) and four tracing points of the 9th tracing point (Pt9) need draw, if but trajectory is also formed according to these four tracing points, the trend of its trajectory can have big distortion with the reality trend so, therefore more accurate for the trend that makes trajectory, this step is used for determining for each tracing point increases line drawing zone bit whether this tracing point needs the node as trajectory.Line drawing zone bit is divided into 0 and 1,0 expression equally not as the trajectory node, and 1 regards as the trajectory node.Line drawing mark position with all tracing points is 0 in advance, according to variable condition information each tracing point is judged in order judgement regular as follows then:
When (1) variable condition information was for " entering window ", the line drawing mark position of last tracing point was 1, and the line drawing mark position of current tracing point is 1;
When (2) variable condition information was for " continuing in window ", the line drawing zone bit of current tracing point was identical with the some drawing zone bit of current tracing point;
When (3) variable condition information was for " leaving window ", the line drawing mark position of current tracing point was 1;
When (4) variable condition information is for " continuing outside window ", be left intact.Finally, result is as shown in table 4.
Table 4
Step 6 is carried out the drafting of tracing point and trajectory according to the initial trace point data after filtering.
In this step 6, carry out the drafting of tracing point and trajectory according to some drawing zone bit in the step 5 and line drawing zone bit.
Optimize the tracing point that draw the back: second tracing point (Pt2), the 3rd tracing point (Pt3), the 8th tracing point (Pt8) and the 9th tracing point (Pt9);
Optimize the trajectory node that draw the back: first tracing point (Pt1), second tracing point (Pt2), the 3rd tracing point (Pt3), the 5th tracing point (Pt5), the 7th tracing point (Pt7), the 8th tracing point (Pt8) and the 9th tracing point (Pt9), the tenth tracing point (Pt10);
So far, the optimization that vehicle monitoring system has been finished to track shows that final drawing effect as shown in Figure 3.
Fig. 4 is a trace playback display effect synoptic diagram without optimization; what tracing point was a large amount of as can see from Figure 4 crowds together; visual effect is had a greatly reduced quality; though it is comparatively detailed that tracing point shows; but just some key points that the user is concerned about; so too many system resource of playback effect waste, and user's visual experience extreme difference.In having used vehicle monitoring system of the present invention behind the optimization method of track playback function; system's shielding automatically is in the outer tracing point of map window; and the tracing point in the map window evenly distributed; reduced the tracing point quantity that actual needs is drawn; thereby alleviated the computational burden of system; make system's operation smooth more; and it is the required track of user is accurate by equally distributed crucial tracing point; attractive in appearance shows; therefore; be that system performance aspect or display effect aspect all are greatly improved, the trace playback display effect after the optimization as shown in Figure 5.
Vehicle monitoring system mainly is made up of three parts, i.e. communication network, car-mounted terminal and Surveillance center.The principle of work of vehicle monitoring system is: car-mounted terminal is by GPS (Global Positioning System, GPS) module is obtained the GPS locating information in real time and is sent to Surveillance center by communication network, and Surveillance center is presented at the running orbit of each vehicle form with symbolism on the electronic chart according to the GPS locating information received.Communication network is responsible for the transmission of data between Surveillance center and the mobile car-mounted terminal, is the transmitting device of system; Car-mounted terminal is the important component part of vehicle-mounted monitoring system, and it is equivalent to " sensor " of total system, is installed on the vehicle that needs monitoring management; Surveillance center is the signal centre and the service display core of whole vehicle monitoring system, be responsible for the reception of car-mounted terminal gps data and issuing of steering order, for the user provides monitoring and dispatch service, simultaneously vehicle-mounted data and steering order are stored and transmitted, for the real-time monitoring and the historical data playback of monitor client provides the data guarantee.The optimization method of track playback function is mainly realized in Surveillance center in the vehicle monitoring system of the present invention, receives the original GPS locator data that car-mounted terminal sends, and carries out optimization process, represents the required crucial tracing point of user.
Though more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make numerous variations or modification to these embodiments.Therefore, protection scope of the present invention is limited by appended claims.
Claims (4)
1. the optimization method of track playback function in the vehicle monitoring system is characterized in that it may further comprise the steps:
Step 1, determine the initial trace point data that track playback function need be handled;
Step 2, the border that obtains current map window and engineer's scale, border are used to filter the outer initial trace point of current map window, and engineer's scale is used to calculate the distance between the initial trace point and filters initial trace the point overlapping or next-door neighbour;
Step 3, judge initial trace point whether in current map window, and in the initial trace point data, increase zone bit in the window and with respect to the variable condition information of last tracing point according to the border of current map window;
Step 4, for each initial trace point increases a some drawing zone bit, compare according to a distance between the initial trace point and a threshold values, it is drawn to determine whether this tracing point needs;
Step 5, be that each initial trace point increases line drawing zone bit, whether needs add trajectory node queue to determine this tracing point according to variable condition information;
Step 6, carry out the drafting of tracing point and trajectory according to the initial trace point data after filtering.
2. the optimization method of track playback function is characterized in that in the vehicle monitoring system as claimed in claim 1, and described track playback function is to carry out visualization display on the trajectory that simulating vehicle travels and the electronic chart that is added to by tracing point.
3. the optimization method of track playback function in the vehicle monitoring system as claimed in claim 1, it is characterized in that, the border of the longitude of original tracing point, latitude and current map window compares in the described step 3, determine that this tracing point is whether in current map window, if in current map window, then the mark position is one in the window; If outside current map window, then the mark position is zero in the window.
4. the optimization method of track playback function is characterized in that in the vehicle monitoring system as claimed in claim 1, and described step 6 is carried out the drafting of tracing point and trajectory according to some drawing zone bit in the step 5 and line drawing zone bit.
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| CN113554932B (en) * | 2020-04-23 | 2022-07-19 | 华为技术有限公司 | Track playback method and device |
| CN112507058A (en) * | 2021-02-05 | 2021-03-16 | 成都怡康科技有限公司 | Track playback method based on positioning terminal |
| CN112507058B (en) * | 2021-02-05 | 2021-04-16 | 成都怡康科技有限公司 | Track playback method based on positioning terminal |
| CN112990114A (en) * | 2021-04-21 | 2021-06-18 | 四川见山科技有限责任公司 | Traffic data visualization simulation method and system based on AI identification |
| CN113593397A (en) * | 2021-08-18 | 2021-11-02 | 哈尔滨海能达科技有限公司 | Historical track data loading method, device and system |
| CN113593397B (en) * | 2021-08-18 | 2023-08-08 | 哈尔滨海能达科技有限公司 | Historical track data loading method, device and system |
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