CN103177577B - 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 traffic-information service technical field, particularly a kind of dynamic information service providing method based on map overlay.
Background technology
Industrialized country, under the guidance of market economy, mostly experienced by the development that expanding economy promotes automobile, and the process that the development of automobile industry stimulates economic development, thus these countries achieve the epoch of motorize as early as possible.The such as traffic jam that motorize society brings, traffic hazard, the social concern such as energy-consuming and environmental pollution worsens increasingly, the economic loss that traffic jam causes is huge, make the U.S. that road equipment is very flourishing, Japan etc. also has to turn to from the thoughtcast only satisfied the demands by supply in the past take to supply, the techniques and methods of two aspect managed together is needed to improve the traffic problems be becoming increasingly acute, these industrial countries be based upon on wheel of the bus should safeguard motorize society in exploration, alleviate in the way of congested in traffic problem again, be intended to reach by modernization technological means " ensure safety to improve traffic, raise the efficiency, environmental protect, economize energy " object, the concept of such ITS is just progressively formed.
At intelligent transportation field, real-time dynamic information service can provide efficiently feasible traffic guidance and trip planning information for Public Traveling, communications and transportation etc., thus reaches and save time, reduce costs and the object such as low-carbon environment-friendly.Floating current car (Floating Car Data is called for short FCD) technology is one of most important technological means obtaining dynamic information in intelligent transportation system.Its ultimate principle is: according to the vehicle of equipment vehicle-bone global positioning system (GPS), the positional information of periodic logging in vehicle travel process, the computation model that application comprises map match, traffic route is inferred and road traffic congestion information calculating etc. is correlated with and algorithm process, thus floating car data and urban road are associated over time and space, finally obtain Floating Car through traffic congestion information such as the Vehicle Speed of road and the running time of road.
At present the mode major part of traffic-information service is provided to be to Internet user: first by manual type the issue road network of traffic-information service provider to be carried out mating with the display road network of ISP and encode, and be made into matching relationship table, then the traffic information got is rendered into existing map road network based on matching list and gets on by Internet provider, then is presented to the public.The fast development of current China economy, Transportation industry also with explosion type ground speed increment, the intercity road enormous amount in city, artificial matching way originally needs a large amount of manual operations, waste time and energy, inefficiency, and certain loss of significance is there is 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 increase transport information and to be added to the efficiency of general map and accuracy.
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 providing the basic GIS server of basic GIS service and providing the cooperating of traffic information server of traffic information tile figure, for user provides the dynamic information service based on map overlay;
The workflow of described basic GIS server comprises the following steps:
Step 1.1: start service, waits for the traffic-information service request of user;
Step 1.2: after receiving traffic-information service request, sends the request of road conditions picture to traffic information server, and the traffic information tile figure under application certain proportion chi, within the scope of certain longitude and latitude, then waits for the feedback of traffic information server;
Step 1.3: after receiving the traffic information tile figure that traffic information server returns, superposed by described traffic information tile figure with the basic GIS map in this locality of same ratio chi and longitude and latitude scope, obtains transport information map and feeds back to user's display;
On described traffic information server create have tile map pyramid model, and to each tile map in proportion chi, longitude and latitude scope set up road network index file, the workflow of described traffic information server comprises the following steps:
Step 2.1: load road network index and associated profile, starts service;
Step 2.2: create a timed thread, timing retrieval (local retrieval or far call) also obtains up-to-date real-time road data, according to different scale and longitude and latitude scope, corresponding road network information is read by road network index file, carry out road conditions to play up, generate corresponding traffic information tile figure, set up and to number and under being stored in assigned catalogue; Meanwhile, the road conditions picture request of the basic GIS server of multichannel is monitored;
Step 2.3: after receiving the request of road conditions picture, parses engineer's scale, longitude and latitude scope that this road conditions picture request relates to;
Step 2.4: according to the engineer's scale parsed, longitude and latitude scope, calculates quantity and the numbering of the traffic information tile figure that need transfer, and extracts corresponding traffic information tile figure from described assigned catalogue;
Step 2.5: the traffic information tile figure extracted is returned to basic GIS server by the mode of information flow.
The invention has the beneficial effects as follows the service level that greatly can improve traffic-information service business, for application end saves loaded down with trivial details road network work for the treatment of, what simplify business service calls complexity, road conditions picture can be directly obtained and current mature GIS tile API combines based on the ajax technology of B/S, reach the Overlay of traffic information figure and base map, business service end is without the need to paying close attention to playing up of road conditions picture, be absorbed in business function, greatly alleviate the load of service server and the technical capability requirement of developer, thus save very large manpower and materials cost for enterprise.
Accompanying drawing explanation
Fig. 1 is the workflow schematic diagram of road conditions information server in the embodiment of the present invention.
Fig. 2 is the system architecture schematic diagram of road conditions 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 providing the basic GIS server of basic GIS service and providing the cooperating of traffic information server of traffic information tile figure, for user provides the dynamic information service based on map overlay;
The workflow of described basic GIS server comprises the following steps:
Step 1.1: start service, waits for the traffic-information service request of user;
Step 1.2: after receiving traffic-information service request, sends the request of road conditions picture to traffic information server, and the traffic information tile figure under application certain proportion chi, within the scope of certain longitude and latitude, then waits for the feedback of traffic information server;
Step 1.3: after receiving the traffic information tile figure that traffic information server returns, superposed by described traffic information tile figure with the basic GIS map in this locality of same ratio chi and longitude and latitude scope, obtains transport information map and feeds back to user's display;
Described traffic information server creates and has tile map pyramid model, and chi, longitude and latitude scope set up 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 associated profile, starts service;
Step 2.2: create a timed thread, retrieve (local retrieval or far call) every a few minutes and obtain up-to-date real-time road data, according to different scale and longitude and latitude scope, corresponding road network information is read by road network index file, carry out road conditions to play up (only playing up the engineer's scale knowing display road network), generate corresponding traffic information tile figure, set up and to number and under being stored in assigned catalogue; Meanwhile, the road conditions picture request of the basic GIS server of multichannel is monitored;
Step 2.3: after receiving the request of road conditions picture, parses engineer's scale, longitude and latitude scope that this road conditions picture request relates to;
Step 2.4: according to the engineer's scale parsed, longitude and latitude scope, calculates quantity and the numbering of the traffic information tile figure that need transfer, and extracts corresponding traffic information tile figure from described assigned catalogue;
Step 2.5: the traffic information tile figure extracted is returned to basic GIS server by the mode of information flow.
In the preferred embodiment, the system architecture of traffic information server as shown in Figure 2.Above-mentioned traffic information server is the Web server built with Apache.The traffic information service that 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 traffic information service, with the monitoring of the timing renewal and user side request of carrying out road condition data.Specific implementation method is: create a timed thread, retrieval and the acquisition of up-to-date real-time road data is carried out by the timing of road conditions retrieval module, then the up-to-date real-time road data obtained are transferred to that road conditions are played up, image generating module is carried out road conditions and played up and generate corresponding traffic information tile figure, preserve module finally by road conditions tile and preserve.When Apache Server has listened to user side request, transfer to URL, process, return the parsing that module carries out engineer's scale, longitude and latitude scope etc., then quantity and numbering that tile scope processing module calculates the traffic information tile figure that need transfer is called, to extract corresponding traffic information tile figure from assigned catalogue, finally, URL, process, return module the traffic information tile figure extracted is returned to user side by the mode of information flow.
Below the correlation technique that the present invention relates to is further described.
1, common road network is played up
It is by internet that the visualization of current most of road information represents, and provides in the mode of electronic chart, and the process that represents of electronic chart mainly contains two kinds of modes, and one is map vector mode, and one is static map mode.Map vector seldom uses at present internet arena.Static map mode, also referred to as 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 represented is constant.First the quantity N of the level of zoom that map service platform will provide is determined, the maximum map picture of level of zoom is minimum, map scale is as pyramidal bottom, namely the 0th layer, and piecemeal is carried out to it, from the upper left corner of map picture, cut from left to right, 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 synthesizing a pixel by every 2 × 2 pixels generates the 1st layer of map picture, and carries out piecemeal to it, is divided into the square map tile with lower one deck formed objects, forms the 1st layer of tile matrix; Adopt generation the 2nd layer of tile matrix that use the same method; ...; So go down, until N-1 layer, form whole tile pyramid.Current Ge great Internet map service provider all adopts this kind of mode.
2, transport information obtains
Here transport information is traffic information, is generally to be issued by special traffic-information service provider, and commonly webservice form, form is generally the DTI form of standard in Chinese scope.How obtaining transport information not within the scope of the discussion of this patent by url, the prerequisite of this patent is the stacking diagram how directly providing road conditions figure and foundation drawing when having transport information.
3, road conditions figure plays up
Set up road conditions memory map object based on certain programming language, general size is 256*256 pixel, and by road network point, road average running speed, adopts suitable color value, be rendered in object picture, and returns and preserve rendering result.
Playing up picture is a kind of more common technology, for java:
4, transport information map superposition
The terrestrial object information of condition of road surface and road periphery can better be shown after traffic information tile figure superposes with basic GIS map, describe the stacking method of transport information map here for the base map of google.
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 to be added on map.Map superposition needs the most basic problem solved to be foundation and the correspondence of coordinate system, the map of same geographic location must be superimposed be only correct, below coordinate system required for simple declaration Map Services.
General maps service uses following three kinds of coordinate systems: (1) pixel coordinate, quotes a point on segment; (2) segment coordinate, quotes a segment in 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.GPoint (x, y) can be used certain point quoted in particular tile.The initial point (0,0) of each segment is expressed as the northwest corner of segment.Therefore, for the single segment representing the whole earth, initial point is set in the arctic, and longitude-180 is spent.The more past east of x (longitude) value is larger, and y (latitude) value is more large toward South Uietnam, until southeast corner (255,255).
In higher leveled level of zoom, pixel space all expands in x and y direction and is twice.Such as, in level of zoom 1, map comprises the segment of 4 256 × 256 pixels, produces the pixel space of 512 × 512.At level of zoom N, each x and the y pixel on map all can use the value between 0 and 256*2N to quote.
(2) segment coordinate
To 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 calculate pixel coordinate relative to the initial point of this segment very useful.Any self-defined map all needs to carry out identical segment value and calculates.Segment in Google Maps calculates from the initial point identical with pixel, to make initial point segment be in the northwest corner of map all the time.Segment uses (x, the y) coordinate counted from this initial point to carry out index.Such as, in level of zoom 2, when the earth is divided into 16 segments, each segment can by unique (x, a y) to quoting.
A GTileLayer can be built with Google Maps API, GTileLayerOptions parameter is transmitted as object constant.GTileLayerOptions parameter comprises tileUrlTemplate attribute, according to segment coordinate, segment request can be mapped to network address.The constructed fuction of superimposed layer may be as follows:
Utilize the method easily to be superposed with google map by traffic information tile figure, the GIS service of band traffic information is provided.
(3) projection coordinate is changed
The earth be one spherical, and map is the two-dimensional object of plane.Map in Google Maps API is this spherical in the plane " projection ".Modal is Mercator projection.By the simplest mode, it is corresponding one to one that projection can be defined as between GLatLng value and the coordinate on map, and GProjection interface provides the conversion utility for this purposes.
GLatLng value can be converted to the pixel coordinate of specifying level of zoom by GProjection.fromLatLngToPixel () method.Similarly, GProjection.fromPixelToLatLng () method can be converted to GLatLng value by specifying the pixel coordinate of level of zoom.When different map style location point process, these methods are very useful, because their off-set values that you can be allowed to determine to show which segment, use when how to show them and show them.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (4)
1. the dynamic information service providing method based on map overlay, it is characterized in that: the method is by providing the basic GIS server of basic GIS service and providing the cooperating of traffic information server of traffic information tile figure, for user provides the dynamic information service based on map overlay;
The workflow of described basic GIS server comprises the following steps:
Step 1.1: the traffic-information service request waiting for user;
Step 1.2: after receiving traffic-information service request, sends the request of road conditions picture to traffic information server, and the traffic information tile figure under application certain proportion chi, within the scope of certain longitude and latitude, then waits for the feedback of traffic information server;
Step 1.3: after receiving the traffic information tile figure that traffic information server returns, superposed by described traffic information tile figure with the basic GIS map in this locality of same ratio chi and longitude and latitude scope, obtains transport information map and feeds back to user's display;
Described traffic information server creates and has tile map pyramid model, 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, plays up in the enterprising walking along the street condition of the tile map of correspondence, generates corresponding traffic information tile figure and store; Meanwhile, the road conditions picture request of the basic GIS server of multichannel is monitored;
Step 2.3: after receiving the request of road conditions picture, parses engineer's scale, longitude and latitude scope that this road conditions picture request relates to;
Step 2.4: according to the engineer's scale parsed, longitude and latitude scope, extracts corresponding traffic information tile figure;
Step 2.5: the traffic information tile figure extracted is returned to basic GIS server by the mode of information flow.
2. the dynamic information service providing method based on map overlay according to claim 1, it is characterized in that: to each tile map on tile map pyramid model, chi, longitude and latitude scope set up road network index file to described traffic information server in proportion, in step 2.2, after obtaining up-to-date real-time road data, according to different scale and longitude and latitude scope, read corresponding tile map 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 generated and to be numbered and under being stored in assigned catalogue, in step 2.4, according to the engineer's scale parsed, longitude and latitude scope, calculate quantity and the numbering of the traffic information tile figure that need transfer, from described assigned catalogue, then extract corresponding traffic information tile figure.
4. the dynamic information service providing method based on map overlay according to claim 1,2 or 3, it is characterized in that: described traffic information server is the Web server built with Apache, the traffic information service that described traffic information server provides is compiled as DSO dynamic base module, loads described DSO dynamic base module start traffic information service by configuration.
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