CN103177577A - Dynamic traffic information service providing method based on map layer overlapping - Google Patents
Dynamic traffic information service providing method based on map layer overlapping Download PDFInfo
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Abstract
The invention relates to the technical field of traffic information service and particularly relates to a dynamic traffic information service providing method based on the map layer overlapping. The method includes that a basic geographical information system (GIS) providing basic GIS service and a road condition information server providing a road condition information file map are matched in work, the basic GIS server receives a user request and applies for the road condition information tile map with certain proportional scale and longitude and latitude range, the road condition information tile map and a local basic CIS map are overlapped to obtain a traffic information map after feedback is obtained, and the traffic information map is fed back to a user to be displayed. The road condition information server timely acquires newest real-time road condition data, conducts road condition rendering, generates a road condition information tile map, stores the map, then receives a road condition map request, extracts a corresponding road condition information tile map from a storage catalogue, and returns the map to the basic GIS server. By means of the method, overlapping efficiency and accuracy of traffic information to common maps are improved.
Description
Technical field
The present invention relates to the traffic-information service technical field, particularly a kind of dynamic information service providing method based on map overlay.
Background technology
Industrialized country has mostly experienced the development of expanding economy promotion automobile under the guidance of market economy, and the process that the development of automobile industry stimulates economic development, thereby these countries have realized the epoch of motorize as early as possible.motorize society bring such as traffic jam, traffic hazard, the social concern such as energy-consuming and environmental pollution worsens increasingly, the economic loss that traffic jam causes is huge, make road equipment very flourishing U.S., Japan waits also to have to turn to from the thoughtcast that only satisfies the demands by supply in the past and takes confession, need technology and the method for two aspect managed together to improve the traffic problems that are becoming increasingly acute, these industrial countries that are based upon on wheel of the bus should safeguard that in exploration motorize is social, alleviate again in the way of congested in traffic problem, being intended to improve traffic by the modernization technological means reaches and " ensures safety, raise the efficiency, improve environment, energy savings " purpose, the concept of ITS just progressively forms like this.
At intelligent transportation field, the real-time dynamic information service can provide efficient feasible traffic guidance and trip planning information for Public Traveling, communications and transportation etc., saves time, reduces costs and the purpose such as low-carbon environment-friendly thereby reach.Floating current car (Floating Car Data is called for short FCD) technology is one of most important technological means of obtaining in intelligent transportation system dynamic information.Its ultimate principle is: according to the vehicle of equipment vehicle-bone global positioning system (GPS), the positional information of periodic logging in the Vehicle Driving Cycle process, application comprises that map match, traffic route are inferred and relevant computation model and the algorithms such as road traffic congestion information calculating are processed, thereby floating car data and urban road are associated on time and space, finally obtain the Vehicle Speed of road that Floating Car is passed through and the traffic congestion information such as running time of road.
At present provide the mode major part of traffic-information service to be to the Internet user: at first by manual type, the issue road network of traffic-information service provider and the demonstration road network of ISP to be mated coding, and be made into the matching relationship table, then internet provider is rendered into existing map road network with the traffic information that gets based on matching list and gets on, then represents to the public.The fast development of current China economy, Transportation industry be also with explosion type ground speed increment, the intercity road enormous amount in city, artificial matching way originally needs a large amount of manually-operateds, waste time and energy, inefficiency, and have certain loss of significance in the process of coupling.
Summary of the invention
The object of the present invention is to provide a kind of dynamic information service providing method based on map overlay, the method has improved transport information be added to efficient and the accuracy of general map.
For achieving the above object, technical scheme of the present invention is: a kind of dynamic information service providing method based on map overlay, the method is by the basic GIS server that basic GIS service is provided and the cooperating that the traffic information server of traffic information tile figure is provided, for the user provides dynamic information service based on map overlay;
The workflow of described basic GIS server comprises the following steps:
Step 1.1: start service, wait for user's traffic-information service request;
Step 1.2: after receiving the traffic-information service request, send the request of road conditions picture to the traffic information server, then the traffic information tile figure under application certain proportion chi, in certain longitude and latitude scope waits for the feedback of traffic information server;
Step 1.3: after receiving the traffic information tile figure that the traffic information server returns, with the local basic GIS map stack of described traffic information tile figure and same ratio chi and longitude and latitude scope, obtain the transport information map and feed back to the user showing;
Creating on described traffic information server has tile map pyramid model, and to each tile map in proportion chi, longitude and latitude scope set up the road network index file, the workflow of described traffic information server comprises the following steps:
Step 2.1: load road network index and relevant configuration file, start service;
Step 2.2: create a timing thread, regularly retrieval (local retrieval or far call) is also obtained up-to-date real-time road data, according to different scale and longitude and latitude scope, read corresponding road network information by the road network index file, carrying out road conditions plays up, generate corresponding traffic information tile figure, set up and number and be stored under assigned catalogue; Simultaneously, monitor the road conditions picture request of the basic GIS server of multichannel;
Step 2.3: after receiving the request of road conditions picture, parse engineer's scale, longitude and latitude scope that this road conditions picture request relates to;
Step 2.4: according to the engineer's scale that parses, longitude and latitude scope, calculate quantity and the numbering of the traffic information tile figure that need transfer, extract corresponding traffic information tile figure from described assigned catalogue;
Step 2.5: the mode with the traffic information tile figure that extracts by information flow returns to basic GIS server.
the invention has the beneficial effects as follows and greatly to improve traffic-information service business's service level, for application end is saved loaded down with trivial details road network matching treatment work, simplify the complexity of calling of business service, can directly obtain road conditions picture and current mature GIS tile API combination based on the ajax technology of B/S, reach the Overlay of traffic information figure and base map, the business service end need not to pay close attention to playing up of road conditions picture, be absorbed in business function, greatly alleviate the load of service server and developer's technical capability requirement, thereby for enterprise saves very large manpower and materials cost.
Description of drawings
Fig. 1 is the workflow schematic diagram of traffic information server in the embodiment of the present invention.
Fig. 2 is the system architecture schematic diagram of traffic information server in the embodiment of the present invention.
Embodiment
The present invention is based on the dynamic information service providing method of map overlay, the method is by the basic GIS server that basic GIS service is provided and the cooperating that the traffic information server of traffic information tile figure is provided, for the user provides dynamic information service based on map overlay;
The workflow of described basic GIS server comprises the following steps:
Step 1.1: start service, wait for user's traffic-information service request;
Step 1.2: after receiving the traffic-information service request, send the request of road conditions picture to the traffic information server, then the traffic information tile figure under application certain proportion chi, in certain longitude and latitude scope waits for the feedback of traffic information server;
Step 1.3: after receiving the traffic information tile figure that the traffic information server returns, with the local basic GIS map stack of described traffic information tile figure and same ratio chi and longitude and latitude scope, obtain the transport information map and feed back to the user showing;
Creating on described traffic information server has tile map pyramid model, and chi, longitude and latitude scope are set up the road network index file in proportion to each tile map; As shown in Figure 1, the workflow of described traffic information server comprises the following steps:
Step 2.1: load road network index and relevant configuration file, start service;
Step 2.2: create a timing thread, retrieve (local retrieval or far call) and obtain up-to-date real-time road data every a few minutes, according to different scale and longitude and latitude scope, read corresponding road network information by the road network index file, carry out road conditions and play up (only play up and to know the engineer's scale that shows road network), generate corresponding traffic information tile figure, set up and number and be stored under assigned catalogue; Simultaneously, monitor the road conditions picture request of the basic GIS server of multichannel;
Step 2.3: after receiving the request of road conditions picture, parse engineer's scale, longitude and latitude scope that this road conditions picture request relates to;
Step 2.4: according to the engineer's scale that parses, longitude and latitude scope, calculate quantity and the numbering of the traffic information tile figure that need transfer, extract corresponding traffic information tile figure from described assigned catalogue;
Step 2.5: the mode with the traffic information tile figure that extracts by information flow returns to basic GIS server.
In preferred embodiment of the present invention, the system architecture of traffic information server as shown in Figure 2.Above-mentioned traffic information server is the Web server of building with Apache.The traffic information service that the traffic information server provides is compiled as DSO dynamic base module.After system brings into operation, start an apache process, load described DSO dynamic base module by configuration and start the traffic information service, with the timing renewal of carrying out road condition data and the monitoring of user side request.Specific implementation method is: create a timing thread, regularly carry out the retrieval of up-to-date real-time road data and obtain by the road conditions retrieval module, then the up-to-date real-time road data transmission that will obtain to road conditions play up, image generating module carries out road conditions and plays up and generate corresponding traffic information tile figure, preserve module by the road conditions tile at last and preserve.When Apache Server has listened to the user side request, transfer to URL, process, return the parsing that module is carried out engineer's scale, longitude and latitude scope etc., then call quantity and numbering that tile scope processing module calculates the traffic information tile figure that need transfer, to extract corresponding traffic information tile figure from assigned catalogue, at last, URL, the mode by information flow returns to user side with the traffic information tile figure that extracts to process, return module.
The below is further described the correlation technique that the present invention relates to.
1, common road network is played up
It is by the internet that the visualization of present most of road information represents, and provides in the mode of electronic chart, and the process that represents of electronic chart mainly contains dual mode, and a kind of is the map vector mode, and a kind of is the static map mode.Map vector seldom uses at present internet arena.The static map mode also referred to as the tile map, is generally pyramid model, and tile map pyramid model is a kind of multiresolution hierarchical model, and from the pyramidal bottom of tile to top layer, resolution is more and more lower, but the geographic range of expression is constant.At first determine the quantity N of the level of zoom that map service platform will provide, the map picture minimum level of zoom, that map scale is maximum is as pyramidal bottom, namely the 0th layer, and it is carried out piecemeal, from the upper left corner of map picture, from left to right, cut from top to bottom, be divided into the square map tile of formed objects (such as 256 * 256 pixels), form the 0th layer of tile matrix; On the basis of the 0th layer of map picture, the method that synthesizes a pixel by every 2 * 2 pixels generates the 1st layer of map picture, and it is carried out piecemeal, is divided into the square map tile with lower one deck formed objects, forms the 1st layer of tile matrix; Adopting uses the same method generates the 2nd layer of tile matrix; ...; So go down, until the N-1 layer consists of whole tile pyramid.Each large internet Map Services business all adopts this kind mode at present.
2, transport information is obtained
The transport information here is traffic information, is generally by the issue of special traffic-information service provider, webservice form commonly, and form is generally the DTI form of standard in Chinese scope.How obtaining transport information not in the discussion scope of this patent by url, the prerequisite of this patent is that the stacking diagram how road conditions figure and foundation drawing directly are provided in the situation of transport information is arranged.
3, road conditions figure plays up
Set up road conditions memory map object based on certain programming language, general size is the 256*256 pixel, and with the road network point, the road average running speed adopts suitable color value, is rendered in object picture, and returns to and preserve rendering result.
Playing up picture is a kind of more common technology, take java as example:
4, transport information map stack
Can better show the terrestrial object information of condition of road surface and road periphery after traffic information tile figure superposes with basic GIS map, describe the stacking method of transport information map as example take the base map of google here.
Google Maps API provides the self-defined map style of definition oneself, and develops brand-new Show Styles.Realize this effect, first construct a GMapType object, and use GMap2.addMapType () method that it is added on map.The basic problem that map stack needs to solve is foundation and the correspondence of coordinate system, the map of same geographic location must be superimposed be only correct, below the needed coordinate system of simple declaration Map Services.
Following three kinds of coordinate systems are used in the General maps service: (1) pixel coordinate, quote a point on segment; (2) segment coordinate is quoted a segment in the segment layer; (3) scaling layer defines total segment number.
Each coordinate system is described as follows:
(1) pixel coordinate
Each segment in Google Maps comprises 256 * 256 pixels.Can use GPoint (x, y) to quoting certain point on particular tile.The initial point of each segment (0,0) is expressed as the northwest corner of segment.Therefore, for the single segment of the whole earth of expression, initial point is set in the arctic, longitude-180 degree.The more past east of x (longitude) value is larger, and the more past South Uietnam of y (latitude) value is large, until southeast corner (255,255).
In higher leveled level of zoom, pixel space all expands in x and y direction and is twice.For example, in level of zoom 1, map comprises the segment of 4 256 * 256 pixels, produces 512 * 512 pixel space.At level of zoom N, each x on map and y pixel all can with 0 and 256*2N between value quote.
(2) segment coordinate
Quote on whole map a unique point normally unpractiaca.In higher level of zoom, Google Maps API can not use an image file to show the whole earth.Therefore determine using which segment, then very useful with respect to the initial point calculating pixel coordinate of this segment.Any self-defined map all needs to carry out identical segment value and calculates.Segment in Google Maps begins to calculate from the initial point identical with pixel, in order to make the initial point segment be in all the time the northwest corner of map.Segment uses (x, y) coordinate of counting from this initial point to carry out index.For example, in level of zoom 2, when the earth was divided into 16 segments, each segment can be by unique (x, a y) to quoting.
Can build a GTileLayer with Google Maps API, the GTileLayerOptions parameter is transmitted as the object constant.The GTileLayerOptions parameter comprises the tileUrlTemplate attribute, can the segment request be mapped to network address according to the segment coordinate.The constructed fuction of superimposed layer may be as follows:
Utilize the method easily with traffic information tile figure and the stack of google map, to provide the GIS service with road conditions information.
(3) change projection coordinate
The earth be one spherical, and map is the two-dimensional object on plane.Map in Google Maps API is this spherical in the plane " projection ".Modal is Mercator projection.With the simplest mode, projection can be defined as corresponding one to one between coordinate on GLatLng value and map, and the GProjection interface provides the conversion utility that is used for this purposes.
GProjection.fromLatLngToPixel () method can be converted to the GLatLng value pixel coordinate of specifying level of zoom.Similarly, GProjection.fromPixelToLatLng () method can will specify the pixel coordinate of level of zoom to be converted to the GLatLng value.These methods are very useful when different map style location points is processed, because they can allow you determine to show which segment, the off-set value of using when how to show them and showing them.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (4)
1. dynamic information service providing method based on map overlay, it is characterized in that: the method is by the basic GIS server that basic GIS service is provided and the cooperating that the traffic information server of traffic information tile figure is provided, for the user provides dynamic information service based on map overlay;
The workflow of described basic GIS server comprises the following steps:
Step 1.1: wait for user's traffic-information service request;
Step 1.2: after receiving the traffic-information service request, send the request of road conditions picture to the traffic information server, then the traffic information tile figure under application certain proportion chi, in certain longitude and latitude scope waits for the feedback of traffic information server;
Step 1.3: after receiving the traffic information tile figure that the traffic information server returns, with the local basic GIS map stack of described traffic information tile figure and same ratio chi and longitude and latitude scope, obtain the transport information map and feed back to the user showing;
Creating on described traffic information server has tile map pyramid model, and the workflow of described traffic information server comprises the following steps:
Step 2.1: start service;
Step 2.2: the up-to-date real-time road data of timing acquisition, play up in the enterprising walking along the street condition of the tile map of correspondence, generate corresponding traffic information tile figure and storage; Simultaneously, monitor the road conditions picture request of the basic GIS server of multichannel;
Step 2.3: after receiving the request of road conditions picture, parse engineer's scale, longitude and latitude scope that this road conditions picture request relates to;
Step 2.4: according to the engineer's scale that parses, longitude and latitude scope, extract corresponding traffic information tile figure;
Step 2.5: the mode with the traffic information tile figure that extracts by information flow returns to basic GIS server.
2. the dynamic information service providing method based on map overlay according to claim 1, it is characterized in that: chi, longitude and latitude scope are set up the road network index file to described traffic information server in proportion to each tile map on tile map pyramid model, in step 2.2, after obtaining up-to-date real-time road data, according to different scale and longitude and latitude scope, read corresponding road network information by described road network index file, play up to carry out road conditions.
3. the dynamic information service providing method based on map overlay according to claim 1, it is characterized in that: described traffic information server is set up the traffic information tile figure that generates and is numbered and be stored under assigned catalogue, in step 2.4, according to the engineer's scale that parses, longitude and latitude scope, calculate quantity and the numbering of the traffic information tile figure that need transfer, then extract corresponding traffic information tile figure from described assigned catalogue.
4. according to claim 1,2 or 3 described dynamic information service providing method based on map overlay, it is characterized in that: described traffic information server is the Web server of building with Apache, the above-mentioned traffic information service that described traffic information server provides is compiled as DSO dynamic base module, loads described DSO dynamic base module by configuration and starts the traffic information service.
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