CN1932922B - Method for Accurately Displaying Real-time Traffic Information - Google Patents

Abstract

The invention discloses a method for accurately displaying real-time road condition information. The method comprises the steps of: determining the driving direction of the road where the road condition information is located; adjusting the display position of the road condition information according to the driving direction and a preset coordinate offset value to ensure The display position of is parallel to the original display position. According to the road grade and driving direction, the present invention adjusts the display position of the road condition information accordingly, clearly distinguishes and shows different situations on the two-way road, thereby accurately displaying the road condition information of the road traffic, and providing accurate traffic information for users to travel Serve. The invention also discloses a device for accurately displaying real-time road condition information.

Description

Method for Accurately Displaying Real-time Traffic Information

technical field

The invention relates to the technical field of intelligent transportation, in particular to a method and a device for accurately displaying real-time road condition information.

Background technique

Nowadays, the traffic situation on urban roads is becoming increasingly tense, and the traditional traffic command mode can no longer meet the needs. People hope to change from passive command to active guidance, so that they can predict the traffic situation before reaching the traffic jam area and prevent congestion.

Therefore, the intelligent transportation system (ITS) technology emerges at the historic moment. It effectively integrates advanced information technology, data communication transmission technology, electronic sensor technology, control technology and computer technology into the entire ground traffic management system, and A system that functions in a wide range and in an all-round way has been established, which can manage comprehensive transportation in real time, accurately and efficiently. ITS is the development direction of the future transportation system.

Among them, the real-time traffic information release system is a specific application of ITS, and it is an effective public-oriented traffic information service platform. It releases traffic and road condition information reliably and in real time through the control platform, and users can grasp the current traffic information in a timely manner through various channels such as the Internet, mobile terminals, vehicle terminals, or personal digital assistants (Personal Digital Assistant, PDA). Generally, real-time traffic information is generated by the traffic information service platform in the form of a map layer, and then delivered to end users. At present, the general practice is to distinguish and represent the real-time traffic condition information in the form of lines of different colors.

However, since the electronic map is only an abstraction of the actual road, the road displayed on the map cannot fully represent the traffic characteristics of the actual road. In particular, two-way roads are usually represented by only one line on the map. If real-time traffic information is displayed directly according to the coordinates of the original road, the traffic information of forward driving and reverse driving will overlap, making it difficult to distinguish two-way roads. traffic information on .

Taking Figure 1 as an example, the AB segment represents two two-way roads in reality, but because the abstract coordinates of the two roads are consistent, the road condition information overlaps together, so the two two-way roads can only be represented by the AB line segment traffic information. Assuming that the line segment AB is currently red, representing congestion, is it congested from A to B, or from B to A? This is a difficult question to determine.

Contents of the invention

The object of the present invention is to provide a method and device for accurately displaying real-time road condition information, so as to solve the problem of inaccurate display of real-time road condition information due to overlap of road condition information.

For this reason, the present invention adopts following technical scheme:

A method for accurately displaying real-time road condition information, comprising the steps of: determining the driving direction of the road where the road condition information is located; adjusting the display position of the road condition information according to the driving direction and a preset coordinate offset value, so as to ensure that the adjusted display position is consistent with the The original display position is parallel.

Said determining the driving direction of the road where the road condition information is located includes the steps of: obtaining the longitude and latitude of the starting point and the longitude and latitude of the ending point of the road; determining the positional relationship between the starting point and the ending point according to the longitude and latitude, and determining the driving direction of the road.

The longitude and latitude are read from the map file in the system that issues the real-time road condition information.

The coordinate offset value is dynamically set according to the zoom level of the map in the system that issues the real-time road condition information.

Said determining the positional relationship between the starting point and the end point according to the longitude and latitude, and determining the road driving direction may include the following steps:

Determine whether the absolute value of the longitude difference between the starting point and the ending point is greater than or equal to the absolute value of the latitude difference,

if,

Compare the size of the longitude of the starting point and the longitude of the ending point:

If the longitude of the starting point is large, determine that the angle range between the driving direction of the road and the due east direction is greater than or equal to -180 degrees and less than or equal to -135 degrees, or greater than or equal to 135 degrees and less than or equal to 180 degrees;

If the longitude of the dead point is large, determine that the angle range between the driving direction of the road and the due east direction is greater than or equal to -45 degrees and less than or equal to 45 degrees;

otherwise,

Compare the latitude of the starting point and the latitude of the ending point:

If the latitude of the starting point is large, determine that the angle between the driving direction of the road and the due east direction is greater than -135 degrees and less than -45 degrees;

If the latitude of the dead point is large, then determine that the angle range between the driving direction of the road and the due east direction is greater than 45 degrees and less than 135 degrees.

The adjustment of the display position of the road condition information includes the following steps:

Determine the angle range between the driving direction of the road and the due east direction,

If it is greater than or equal to -45 degrees and less than or equal to 45 degrees, set the latitude of the starting point and the ending point to reduce the coordinate offset value respectively;

If it is greater than -135 degrees and less than -45 degrees, set the longitude of the start point and end point to reduce the coordinate offset value respectively;

If it is greater than 45 degrees and less than 135 degrees, set the longitude of the starting point and the end point to increase the coordinate offset value respectively;

Otherwise, set the latitude of the start point and the end point to increase the coordinate offset value respectively.

A device for accurately displaying real-time road condition information, comprising a receiving unit, a storage unit, a control unit and a display unit; the receiving unit is used to receive real-time road condition information; the storage unit is used to store preset coordinate offset values The control unit is used to determine the driving direction of the road where the road condition information is located; and adjust the display position of the road condition information according to the driving direction and coordinate offset value, so as to ensure that the adjusted display position is the same as the original display position parallel; the display unit is used to display the road condition information adjusted by the control unit.

The basis for setting the coordinate offset value includes: the zoom level of the map in the system that issues the real-time road condition information.

The longitude and latitude are provided by map files in the system that distributes the real-time traffic information.

The control unit includes a calculation unit and a judgment unit; the calculation unit is used to calculate the longitude difference and the latitude difference between the starting and ending points of the road; the judgment unit is used to compare the longitude difference and the latitude provided by the calculation unit The difference is used to determine the driving direction of the road.

The control unit further includes an execution unit; the execution unit is configured to adjust the display position of the road condition information according to the driving direction determined by the judging unit and the coordinate offset value.

It can be seen that the present invention adjusts the display position of the road condition information according to the road grade and driving direction, clearly distinguishes and shows different situations on the two-way road, thereby accurately displaying the road condition information of the road traffic and providing accurate travel information for users. traffic information service.

Description of drawings

FIG. 1 is a schematic diagram of road condition information display in the prior art;

Fig. 2 is a flowchart of the present invention;

Fig. 3 is the flowchart in the embodiment;

Fig. 4 is a schematic diagram showing a southward offset of the display position of the road condition information in the embodiment;

Fig. 5 is a schematic diagram showing a northward deviation of the display position of road condition information in the embodiment;

Fig. 6 is a schematic diagram of road condition information display in the embodiment;

Fig. 7 is a schematic structural diagram of the device in the present invention.

Detailed ways

The present invention distinguishes the overlapped road condition information by adjusting the display position of the road condition information, so as to accurately represent the traffic condition of the actual road.

In order to facilitate the understanding of the present invention, several concepts in the real-time road condition information distribution system are firstly introduced.

Real-time traffic information: represented by road congestion levels, which are divided into three levels: smooth, slow and congested. The level of congestion is measured by the average speed of vehicles on the road. For example, if the average speed is greater than 40 km/h, it is smooth; if the average speed is between 20 km/h and 40 km/h, it is slow; if the average speed is less than 20 km/h is congestion.

Road grades: divided into three grades: main roads, auxiliary roads and roads with poor traffic capacity. For example, major roads include urban highways, expressways, national highways, and provincial roads; auxiliary roads include county roads and township roads; roads with poor traffic capacity include hutongs and general streets.

Map zoom level: divided into four levels. For example, the scale of the first level is 1:40980 meters, showing the main roads; the scale of the second level is 1:20490 meters, showing the main roads and auxiliary roads; the scale of the third level is 1:10245, showing all roads; the scale of the fourth level It is 1:5122.5 meters, showing all roads.

The process of adjusting the display position of the road condition information in the present invention is actually a process of offsetting the latitude and longitude coordinates of the start and end points of the original road according to the road grade and the map zoom grade. The key to this process is to determine the coordinate offset size and offset direction, and the offset direction corresponds to the driving direction of the road where the road condition information is located.

As shown in Figure 2, the method for accurately displaying real-time road condition information among the present invention comprises:

Step 201: Set a reasonable coordinate offset value according to the road level of the actual road and the zoom level of the map;

Step 202: Determine the driving direction of the road where the road condition information is located, so as to obtain the offset direction;

Determining the driving direction of the road where the road condition information is located is achieved by determining the longitude difference and latitude difference between the starting and ending points of the straight line segment where the road is located, and comparing the longitude difference and latitude difference; the driving direction of the road and the offset direction have a certain The corresponding relationship, so that the offset direction can be obtained. The corresponding relationship between the driving direction of the road and the offset direction is described in detail in the embodiment.

Step 203: Adjust the display position of the road condition information according to the coordinate offset value and offset direction.

Wherein, the basic principle of the adjustment is to ensure that the adjusted display position remains parallel to the original display position.

Embodiments of the present invention will be described below with reference to FIG. 3 , FIG. 4 , FIG. 5 and FIG. 6 .

Step 301: Set a reasonable coordinate offset value according to the zoom level of the map;

When the map zoom level is the first level, the main road is displayed at this time, that is, only the road condition information of the main road is offset, and the offset value is 0.0005; when the map zoom level is the second level, the main road and auxiliary roads are displayed at this time Roads, that is, only the main roads and auxiliary roads are offset, and the offset value is 0.0003; when the map zoom level is level 3 and level 4, all roads are displayed at this time, and the offset value is 0, that is, no offset shift.

Step 302: Read the longitude of the end point and the longitude of the starting point of the straight line segment where the road is located, and judge the difference between the two. If it is positive, execute step 303; if it is negative, execute step 306;

Wherein, the latitude and longitude coordinates of the starting point and the latitude and longitude coordinates of the ending point are read from the map file.

As shown in Figure 4, set the positive direction of the x-axis to be due east, and the positive direction of the y-axis to be due north, then the x-coordinate value can represent the longitude value of the point coordinate, and the y-coordinate value can represent the latitude value of the point coordinate.

Step 303: Determine the difference between the latitude of the stop point and the latitude of the starting point, if it is positive, execute step 304; if it is negative, execute step 305;

Step 304: Compare whether the absolute value of the longitude difference is greater than or equal to the absolute value of the latitude difference, if yes, determine that the angle between the driving direction and the positive direction of the x-axis is between 0 and 45 degrees, and obtain the offset direction to the south; otherwise, then Make sure that the angle between the driving direction and the positive direction of the x-axis is between 45 and 90 degrees, and the offset direction is eastward;

Wherein, the offset direction corresponds to the driving direction, that is, the offset direction can be known after the actual driving direction of the road is determined.

It can be assumed that the driving direction is east, so it should be ensured that the line segment after the offset is parallel to the line segment before the offset, that is, it can be offset to the north or south; a basic principle of the offset is to offset to the outside of the road, if If the driving direction is east, it is judged that it should be shifted to the south.

Step 305: Compare whether the absolute value of the longitude difference is greater than or equal to the absolute value of the latitude difference, if yes, determine that the angle between the driving direction and the positive direction of the x-axis is between -45° and 0°, and obtain the offset direction to the south; otherwise, Then determine that the angle between the driving direction and the positive direction of the x-axis is between -90 and -45 degrees, and the offset direction is westward;

Step 306: Determine the difference between the latitude of the stop point and the latitude of the starting point, if it is positive, execute step 307; if it is negative, execute step 308;

Step 307: Compare whether the absolute value of the longitude difference is greater than or equal to the absolute value of the latitude difference, if yes, determine that the angle between the driving direction and the positive direction of the x-axis is between 135° and 180°, and obtain the offset direction to the north; otherwise, then Make sure that the angle between the driving direction and the positive direction of the x-axis is between 90 and 135 degrees, and the offset direction is eastward;

Step 308: Compare whether the absolute value of the longitude difference is greater than or equal to the absolute value of the latitude difference, if yes, determine that the angle between the driving direction and the positive direction of the x-axis is between -180 and -135 degrees, and obtain the offset direction to the north; otherwise , it is determined that the angle between the driving direction and the positive direction of the x-axis is between -135 and -90 degrees, and the offset direction is westward.

Step 309: According to the offset direction determined in Step 304, Step 305, Step 307, and Step 308, and the coordinate offset value set in Step 301, adjust the latitude and longitude of the start and end points of the line segment accordingly.

in:

When the offset direction is southward, the longitude coordinates of the start and end points remain unchanged, and the latitude coordinates subtract the coordinate offset value;

When the offset direction is east, the longitude coordinates of the starting and ending points are added to the coordinate offset value, and the latitude coordinates remain unchanged;

When the offset direction is northward, the longitude coordinates of the starting and ending points remain unchanged, and the latitude coordinates are added to the coordinate offset value;

When the offset direction is westward, the longitude coordinates of the starting and ending points are subtracted from the coordinate offset value, and the latitude coordinates remain unchanged.

Through the above description, it can be concluded that the corresponding relationship between a, the offset direction and the adjustment operation is shown in Table 1. Among them, a represents the angle between the driving direction and the positive direction of the x-axis.

Table 1

a offset direction Adjust operation [-45°, 45°] South Latitude coordinate (y) minus coordinate offset value (45°, 135°) East Longitude coordinate (x) plus coordinate offset value (-135°, -45°) West Longitude coordinate (x) minus coordinate offset value [-180°, -135°] or [135°, 180°] north Latitude coordinate (y) plus coordinate offset value

Then, for the situation shown in Figure 4, a is in the range of [-45°, 45°], so the original line segment AB should be offset to the south, and the offset line segment A'B' is parallel to AB, and It can truly represent the road condition information of the road. For the situation shown in Figure 5, a is within the range of [-180°, -135°], so the original line segment AB needs to be offset northward, and the offset line segment A'B' is parallel to AB, and can It truly represents the road condition information of the road. For the case where a is in other ranges, the principle is the same, and will not be repeated here.

As shown in Figure 6, by adopting the present invention to adjust the position of the road segment representing road condition information, the overlapping AB segment in Figure 1 has been distinguished, which are respectively CD segment and EF segment, and CD segment represents from A to B The EF segment represents the road from B to A, and it is easy to identify which road is congested. It can be seen that, through the method of the present invention, real-time road condition information of two-way roads can be clearly represented.

In addition to the optimal implementation scheme in the above-mentioned embodiments, the relationship between the road driving direction (a size) and the offset direction can be adjusted according to the situation, as long as the offset road display position is parallel to the original road display position. Can. For example, when a is equal to 45 degrees, you can set the offset direction to the east, and perform the operation of adding the coordinate offset value to the longitude coordinate (x).

The present invention also discloses a device for accurately displaying real-time road condition information, as shown in FIG. 7 , which includes a receiving unit 701 , a storage unit 702 , a control unit 703 and a display unit 704 .

The receiving unit 701 is mainly responsible for receiving real-time road condition information; it is also responsible for receiving the longitude and latitude of the starting point and the longitude and latitude of the ending point of the road where the road condition information is located. Wherein, the longitude and latitude are provided by the map file in the real-time traffic information release system.

The storage unit 702 is mainly used for storing preset coordinate offset values, and the coordinate offset values are set according to road level or map zoom level. When the map zoom level is the first level, the offset value is 0.0005; when the map zoom level is the second level, the offset value is 0.0003; when the map zoom level is the third level and the fourth level, the offset value is 0.

The control unit 703 is responsible for the central control work of the entire device, including determining the driving direction of the road where the road condition information is located according to the longitude and latitude; and controlling the display position of the road condition information according to the driving direction and coordinate offset value Adjustment, when adjusting, ensure that the adjusted display position remains parallel to the original display position.

As shown in FIG. 7 , the functions of the control unit 703 are completed by a calculation unit 710 , a judgment unit 711 and an execution unit 712 . The calculation unit 710 is used to calculate the longitude and latitude respectively; the judgment unit 711 is used to compare the longitude of the starting point and the longitude of the end point, and compare the latitude of the starting point and the latitude of the end point, and compare the calculation results obtained by the calculation unit; the execution unit 712 is in charge of adjusting the display position of the road condition information according to the result obtained by the judging unit 711 and the coordinate offset value stored in the storage unit 702 .

Preferably, when it is determined that the angle between the road driving direction and the due east direction is greater than or equal to -45 degrees and less than or equal to 45 degrees, the latitude of the starting point and the end point are respectively reduced by the coordinate offset value; it is greater than -135 degrees and less than When -45 degrees, set the longitude of the starting point and the end point to reduce the coordinate offset value respectively; when it is greater than 45 degrees and less than 135 degrees, set the longitude of the starting point and the end point to increase the coordinate offset value respectively; in other cases , set the latitude of the start point and end point to increase the coordinate offset value respectively.

The display unit 704 is responsible for displaying road condition information, mainly displaying the road condition information adjusted by the control unit. Generally, real-time traffic information is generated by the traffic information service platform in the form of a map layer, and then delivered to end users. At present, the general practice is to distinguish and represent the real-time traffic condition information in the form of lines of different colors.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (3)

1. method that accurately shows real-time road condition information is characterized in that described method comprises:

Obtain road starting point longitude and latitude, stop longitude and latitude;

Determine that according to longitude and latitude the position of starting point and stop concerns, determines the road travel direction;

According to direction of traffic and default coordinate offset amount, adjust the display position of described traffic information, guarantee that adjusted display position is parallel with former display position, and the original display position translation round about of the display position of the opposite direction of traffic of direction;

Wherein, determine the road travel direction, adjust the display position of described traffic information according to direction of traffic and coordinate offset amount in advance, comprise: the difference of judging described road stop longitude and starting point longitude, if just, then judge stop latitude and starting point latitude difference, if just, whether then compare the longitude absolute difference more than or equal to the latitude absolute difference, if determine that then direction of traffic and X-axis positive dirction angle are between 0～45 degree, and it is to the south to obtain the offset direction, when being offset, the terminal longitude coordinate is constant, and latitude coordinate deducts the coordinate offset value;

Judge the difference of described road stop longitude and starting point longitude, if just, then judge stop latitude and starting point latitude difference,, whether then compare the longitude absolute difference more than or equal to the latitude absolute difference if just, if not, then determine direction of traffic and X-axis positive dirction angle between 45～90 degree, and obtain the offset direction eastwards, when being offset, the terminal longitude coordinate adds the coordinate offset value, and latitude coordinate is constant;

Judge the difference of described road stop longitude and starting point longitude, if just, then judge stop latitude and starting point latitude difference,, whether then compare the longitude absolute difference more than or equal to the latitude absolute difference if negative, if, then determine direction of traffic and X-axis positive dirction angle between-45～0 degree, and it is to the south to obtain the offset direction, when being offset, the terminal longitude coordinate is constant, and latitude coordinate deducts the coordinate offset value;

Judge the difference of described road stop longitude and starting point longitude, if just, then judge stop latitude and starting point latitude difference,, whether then compare the longitude absolute difference more than or equal to the latitude absolute difference if negative, if not, then determine direction of traffic and X-axis positive dirction angle between-90～-45 degree, and obtain the offset direction westwards, when being offset, the terminal longitude coordinate deducts the coordinate offset value, and latitude coordinate is constant;

Judge the difference of described road stop longitude and starting point longitude, if it is negative, then judge stop latitude and starting point latitude difference,, whether then compare the longitude absolute difference more than or equal to the latitude absolute difference if just, if, then determine direction of traffic and X-axis positive dirction angle between 135～180 degree, and obtain the offset direction northwards, when being offset, the terminal longitude coordinate is constant, and latitude coordinate adds the coordinate offset value;

Judge the difference of described road stop longitude and starting point longitude, if it is negative, then judge stop latitude and starting point latitude difference,, whether then compare the longitude absolute difference more than or equal to the latitude absolute difference if just, if not, then determine direction of traffic and X-axis positive dirction angle between 90～135 degree, and obtain the offset direction eastwards, when being offset, the terminal longitude coordinate adds the coordinate offset value, and latitude coordinate is constant;

Judge the difference of described road stop longitude and starting point longitude, if it is negative, then judge stop latitude and starting point latitude difference,, whether then compare the longitude absolute difference more than or equal to the latitude absolute difference if negative, if, then determine direction of traffic and X-axis positive dirction angle between-180～-135 degree, and obtain the offset direction northwards, when being offset, the terminal longitude coordinate is constant, and latitude coordinate adds the coordinate offset value;

Judge the difference of described road stop longitude and starting point longitude, if it is negative, then judge stop latitude and starting point latitude difference,, whether then compare the longitude absolute difference more than or equal to the latitude absolute difference if negative, if not, then determine direction of traffic and X-axis positive dirction angle between-135～-90 degree, and obtain the offset direction westwards, when being offset, the terminal longitude coordinate deducts the coordinate offset value, and latitude coordinate is constant;

Wherein, the X-axis positive dirction is due east, and being provided with according to the map zoom level of coordinate offset value carried out.

2. the method for accurate demonstration real-time road condition information according to claim 1 is characterized in that,

Described starting point longitude and latitude, stop longitude and latitude are to read in the map file from the system that issues described real-time road condition information to obtain.

3. the method for accurate demonstration real-time road condition information according to claim 1 and 2 is characterized in that, described coordinate offset value,

Be to dynamically arrange according to the map zoom level in the system of the described real-time road condition information of issue.

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