CN101349567A - Method for providing local mobile geographical information service based on GPS and mobile terminal - Google Patents
Method for providing local mobile geographical information service based on GPS and mobile terminal Download PDFInfo
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Abstract
A method for providing local mobile geographical information services based on the GPS and mobile terminals comprises firstly, prompting users to select maps, and conducting the map switch according to the selection of the users, and displaying the map on the screen of a mobile terminal, and continuing following one or a plurality of operation steps of local mobile geographical information services according to the subsequent selections of the users, such as translating or reducing or amplifying the map, self-positioning of the mobile terminal, monitoring and tracing path, inquiring interest points, searching the optimal path or exhibiting historical tracks. The method of the invention has simple and practicable operation step and low communication cost, and can realize various local mobile geographical position information services on the mobile terminal simply, real-timely and high effectively at any time and place. The invention has the advantages of strong mobility, small communication content, low cost, excellent practicability, high query efficiency and strong flexibility, which has great application and spread prospects.
Description
Technical field
The present invention relates to a kind of method that geographic information services is provided, exactly, the local geographical location information service (LBS of moving of providing of a kind of GPS of utilization and portable terminal is provided, Location Based Service) method, use the inventive method, can select to show, consult various maps and this map is carried out translation, convergent-divergent processing, and realize portable terminal position oneself, inquire about multiple functions such as point of interest, navigation and path trace, belong to value-added telecom services and Computer Applied Technology field.
Background technology
Along with coming of knowledge economy times, information has become the source of human society wealth.Now, people produce with life in information more than 80 percent all relevant with geospatial location.The develop rapidly of information science technology and widespread use have driven the demand of the whole society to geographical location information, as obtaining, the important tool of analyzing and processing and management geographical spatial data, Geographic Information System (the GIS of technology and subject, Geographic Information System), over surplus in the of nearly ten years, extensive concern and fast development have been obtained, and relating to resource exploration, environmental assessment, hazard prediction, the territory management, city planning, post and telecommunications, communications and transportation, military public security, hydraulic and electric engineering, the communal facility management, agriculture forest and husbandry, statistics, all be used widely in nearly all field such as trade financing, become the important component part in country or the global information flow, and developed into one of the most basic information service of current society gradually.
As everyone knows, GIS is an infosystem based on the management spatial object of data base management system (DBMS) (DBMS), is that operand is the fundamental difference of Geographic Information System and other information systems with huge geographical spatial data.Therefore, the geographical spatial data of magnanimity is the important content of GIS, also is the soul and the life of generalized information system.How organizing and handling these mass datas is key links during the GIS application system is built.Also be because will store and handle, so the present application based on the geographical location information service mainly is the form appearance with the desktop generalized information system, as Baidu's map, Google Map, search dog map etc. to mass data.But, because the poor mobility of desktop GIS can not satisfy the demand that the growing spatial positional information of user is served.Therefore, new generation GIS technology-portable GIS technology is just arisen at the historic moment.
As the recent development form-mobile GIS of the Embedded GIS product that to be mobile communication technology combine with traditional Spatial Information Technology, the former provides good carrying, operation platform for the mobile space information service, and the latter can provide the abundant spatial Information Service based on the geographic position for numerous mobile subscribers.Yet, although portable terminal has all had significant improvement and raising on software and hardware, but the equipment of itself of portable terminal limitation: still far away from desktop computer, this manyly is applicable to that the technology and method in the desktop system is difficult to satisfy the requirement of embedded device utilization GIS with regard to making at aspects such as internal memory, storer, processors for it.Therefore, most mobile GIS still adopts the thin-client pattern at present, and promptly its most of GIS function is still finished by the desktop generalized information system in the server; Its primary structure form is that spatial data is stored in server end, and client communicates by HTTP procotol and server end according to user's request, to finish required function.
This mode has the following disadvantages: (1) most of service must by with the finishing alternately of server, communication flows is big, need occupy a large amount of wireless bandwidths; (2) traffic is big, causes the cost of serving costliness, and expense increases; (3) because the situation that service disruption maybe can't be served probably appears in the instability of radio communication, real-time is poor.Therefore, how existing portable GIS technology is improved, just become problem and focus that those skilled in the art paid close attention to.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind ofly can solve the above-mentioned defective of prior art, based on the local movable geographic information service method of providing of GPS and portable terminal, this method be with the service of the major part of GIS all local, be to realize on the portable terminal, almost do not have or obviously reduce the mutual of this portable terminal and server, thereby to remedy when front desktop generalized information system poor mobility and the poor deficiency that geospatial location information service anywhere or anytime can't be provided of thin-client pattern real-time.
In order to achieve the above object, the invention provides a kind of based on the local movable geographic information service method of providing of GPS and portable terminal, it is characterized in that: at first point out the user to select the operation of map, carry out map according to user's selection again and switch, and on the screen of portable terminal, show this map; According to user's follow-up selection, continue to carry out following one or multi-mode operation step then:
(1) on mobile terminal screen, this map is carried out localized translation, amplifies or dwindles processing;
(2) the GPS receiver module in the portable terminal receives the gps signal of built-in GPS locating device or the transmission of external GPS locating device, locate the current position of this portable terminal in real time and accurately, and on display screen, show compass that is used to point the direction and the positional parameter that comprises number of satellites, longitude, latitude, height above sea level, speed, direction;
(3) the GPS receiver module in the portable terminal sends to path trace server by wireless network with short message or GPRS mode with the gps data of its acquisition, so that this portable terminal realizing route is monitored and is followed the tracks of by the path trace server, this portable terminal is preserved the GPS locator data that it continues to obtain simultaneously, forms the historical track record;
(4) portable terminal receives the point of interest title that will inquire about of user input by interface display module or the peripheral point of interest in certain place carries out respectively by after name inquiry or the perimeter query, the point of interest tabulation that searches is presented, do further selection for the user, and the point of interest particular location that the user is selected is presented on the map of mobile terminal screen; And after finishing the local locating query of point of interest, carry out to obtain the more details of point of interest alternately with server again;
(5), be presented on the map of portable terminal the optimal path between these two places is outstanding according to user input or departure place and/or the destination directly on the map of screen, set; Or
(6) if store user's historical track data in the portable terminal, then, can on screen, show the circuit that this user once passed by with historical track according to user's request.
The present invention is a kind of based on the local movable geographic information service method of providing of GPS and portable terminal, this method is based on the present invention under existing network system and network element condition, geographical spatial data and integrated many excellent performances that the software function module of geospatial location service can be provided and develop of magnanimity in portable terminal, have been stored, realize on mobile generalized information system (applying for a patent in the separate case) basis of perfect in shape and function, the inventive method makes the user can be under the prerequisite that significantly reduces the dependence of server, at any time, enjoyment localization everywhere, easy, real-time geospatial location service.Need to prove that localization of the present invention is meant " this locality " of being based on the portable terminal equipment of itself, is not this locality-be the city at terminal place on the geographic concepts.
With respect to existing desktop generalized information system and thin-client pattern, the advantage of the inventive method is: operation steps is simple, practical, can realize the multiple mobile geographical location information service and the inquiry of localization convenient at portable terminal, in real time, because almost there is not communication cost, therefore with low cost, easy to utilize.
The inventive method has following characteristics: (1) movability is strong, can be whenever and wherever possible provides information service based on the geographic position to the user.(2) traffic seldom, expense is very low: because the most information service all realizes on portable terminal, i.e. localization service, few with the communication interaction of server, effectively reduce the traffic of portable terminal and server end, make the user's communications expense significantly reduce, can attract and expand more customer group.(3) real-time height realizes that need not worry to cause service disruption maybe can't use service because of the communication quality difference of communication link, remarkable advantage is to accelerate greatly the time of query-related information because business mostly is localization.(4) dirigibility is strong, and the user only needs the demand according to self, and the geospatial location information or the map of downloaded stored different location in data Layer just can be retrieved and show the relevant range and the location information service of locality is provided.
Therefore, the present invention has special value for following customer group: the frequent user who works out of doors and have the spatial positional information demand for services; The user who often goes to the other places to go on business or travel; Need carry out the enterprise of path trace, as logistics transportation, public security system etc.This method has good popularization and application prospect.
Description of drawings
Fig. 1 is that the mobile terminal software functional module in the system of the local movable geographic information service in basis-provide based on GPS and portable terminal of the inventive method and the structure of data Layer are formed synoptic diagram.
The local movable geographic information service method of providing of GPS and portable terminal operation steps process flow diagram is provided Fig. 2.
Fig. 3 is the operation steps process flow diagram of the displayed map in the inventive method.
Fig. 4 is the operation steps process flow diagram of the translation map in the inventive method.
Fig. 5 is the operation steps process flow diagram that map dwindles/amplifies that carries out in the inventive method.
Fig. 6 is the operation steps process flow diagram of the positioning service in the inventive method.
Fig. 7 is the path monitoring in the inventive method and the operation steps process flow diagram of follow-up service.
Fig. 8 is the inquiry point of interest address in the inventive method and the operation steps process flow diagram of relevant information thereof.
Fig. 9 is the operation steps process flow diagram of the inquiry optimal path in the inventive method.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Referring to Fig. 1, the enforcement basis of the local movable geographic information service method of providing of GPS and portable terminal is provided in introduction: by wireless communication networks, GPS locating device and portable terminal, the network system that the Internet and path trace server are formed, wherein communication network and related network elements are existing equipments, portable terminal comprise have Symbian, smart mobile phone, handheld pcs, the personal digital assistant PDA of Windows Mobile, Linux or other operating system or have the mobile communication terminal of picture and text input, processing and Presentation Function; Wherein innovating key is to have set up a plurality of software function modules in portable terminal: wireless communication module, GPS receiver module, interface display module, point of interest enquiry module, path planning module, locating module, path trace module, GIS engine modules, database management module and the data Layer of being made up of interest point data base, geodata file, geodata index file, geodata topology file and initial configuration file.Wherein:
The GIS engine modules, be the control center of this portable terminal as client, also be the interface of this portable terminal operation and inquiry geographical spatial data, be used for providing the multiple function that comprises map translation, convergent-divergent, coordinate conversion, each geodata file of visit data layer;
Database management module is responsible for visit and management interest point data base, finishes various inquiries, search function that the point of interest enquiry module is provided with;
Locating module is responsible for finishing the correlation function of GPS location: comprise parsing to gps data, call the GIS engine modules and carry out coordinate conversion and call interface display module showing current position location on map;
The path trace module, be used for and give the path trace server by the geographical location information packing back that the GPS receiver module obtains by the wireless communication module timed sending, make this path trace server to monitor and path trace portable terminal according to the positional information of its acquisition;
Path planning module is responsible for carrying out path analysis and searching and computing, so that according to the departure place and the destination of user input, finish the calculating of optimal path apace, and this optimal path is presented on the map;
The point of interest enquiry module is responsible for finishing the function of inquiring about interest point information, and inquiry mode has two kinds: 1) name inquiry: according to the concrete point of interest of point of interest name inquiry; 2) perimeter query: inquire about certain place interest point information on every side.In carrying out the perimeter query process, the user can carry out special theme inquiry, as inquires about the restaurant of periphery, shop etc.After inquiring concrete point of interest, the geographic position of this point of interest can be presented on the map, can call the optimal path that path planning module determines to go to from the somewhere this point of interest subsequently, and on map, show;
Interface display module, the interface as this portable terminal carries out man-machine interaction receives the various operations from the user, and shows response results; Another function is to finish the various draftings and the Presentation Function of map;
The GPS receiver module is responsible for the Bluetooth communication between this portable terminal and built-in GPS locating device or the external GPS locating device, to obtain gps data;
Wireless communication module is responsible for finishing as the portable terminal of client and the communication function between path trace server or other servers, and communication mode comprises note SMS and HTML (Hypertext Markup Language) HTTP.
As everyone knows, from application point of view, the composition of Geographic Information System GIS mainly comprises parts such as hardware, software, method and data.Wherein the various hardware and softwares of computing machine provide working environment for the construction and the operation of generalized information system; Data are important contents of GIS, also are the soul and the life of generalized information system.The tissue of data and processing are the keys during the GIS application system is built; Method then provides concrete solution for operation and the management of GIS, and the QoS performance of the service that provides is provided the operation steps of method, relates to the availability and the maintainability of system.
Referring to Fig. 2, introduce the local movable geographic information service method of providing of GPS and portable terminal is provided: the prompting user selects map earlier, carries out map according to user's selection again and switches, and show this map on mobile terminal screen; According to user's follow-up selection, continue to carry out following one or multi-mode operation step then:
(1) on mobile terminal screen, this map is carried out localized translation, amplifies or dwindles processing;
(2) the GPS receiver module in the portable terminal receives the gps signal that built-in GPS locating device or external GPS locating device send, locate the current position of this portable terminal in real time and accurately, and on display screen, show compass that is used to point the direction and the positional parameter that comprises number of satellites, longitude, latitude, height above sea level, speed, direction;
(3) the GPS receiver module in the portable terminal sends to path trace server by wireless network with short message or GPRS mode with the gps data of its acquisition, by the path trace server this portable terminal realizing route is monitored and is followed the tracks of again; This portable terminal is preserved the GPS locator data that it continues to obtain simultaneously, forms the historical track record;
(4) portable terminal receives the point of interest title that will inquire about of user input by interface display module or the peripheral point of interest in certain place carries out respectively by after name inquiry or the perimeter query, the point of interest tabulation that searches is presented, do further selection for the user, and the point of interest particular location that the user is selected is presented on the map of mobile terminal screen; And after finishing the local locating query of point of interest, carry out to obtain the more details of point of interest alternately with server again;
(5), be presented on the map of portable terminal the optimal path between these two places is outstanding according to user input or departure place and/or the destination directly on the map of screen, set;
(6) if store user's historical track data in the portable terminal, then, can on screen, show the circuit that this user once passed by with historical track according to user's request.
Wherein, the map demonstration is the basic service in the geographic location information query service, and many geospatial location services all are to be based upon on the map basis.For example, can position, also can inquire about point of interest, realizing route monitoring and follow the tracks of, seek optimal path or the like by the map user.Therefore, the basis of the inventive method is by the collaborative service of finishing of consulting and show electronic chart of the interface display module in the portable terminal, GIS engine modules and relevant geographical data file, and location, path monitoring is provided on this basis and follows the tracks of, inquire about multiple different geographical location information services such as point of interest, retrieval optimal path, query history movement locus.Because the service of checking of electronic chart is divided into three parts: map demonstration, map translation and map convergent-divergent.Specify it below respectively.
Referring to Fig. 3, introduce the selection in the inventive method and the operating process of displayed map: the user is after selecting the map menu item of wishing to show on the portable terminal, this terminal is just visited the initial configuration file and is obtained the configuration data that map shows, and send these configuration parameters to the GIS engine modules, and be stored in the map display object structure in this configuration file.The GIS engine modules is according to these configuration parameters, calculate which zone that should show this map this moment, promptly on screen, to show which map block, then according to the map block that calculates number set, visit geographical data directory file, obtain the correspondingly index value of segment, visit geographical data file according to these index values again and obtain corresponding map datum, then these map datums are passed to the data buffer in the GIS engine modules, the coordinate conversion function that calls again in the GIS engine carries out coordinate conversion to map datum, obtains the screen display coordinate of this portable terminal; At last the geodata that is read from the data buffer after the coordinate conversion by interface display module is come map making, finishes the demonstration of map.
After map shows, just can carry out translation or zoom operations to map.It is described respectively below:
Referring to Fig. 4, during the map translation, interface display module receives user's request, send map translation message for the GIS engine modules, the GIS engine modules is according to the translation direction in the translation message, position after the translation of calculating screen judges whether that then new/old map block moves into/shifts out in the screen scope; If there is new map block to move into screen, the piece by calculate obtaining all new map blocks number then, visit geographical data directory file then, obtain the correspondingly index value of segment, visit after geographical data file obtains the corresponding map data according to these index values again, send it to the data buffer in the GIS engine modules, and the coordinate conversion function that is called wherein by the GIS engine modules carries out coordinate conversion to map datum, obtain the screen display coordinate of this portable terminal; If the map block of haveing been friends in the past shifts out screen, also by calculating the whole pieces number that obtain these once visited place segments, deletion and these pieces number corresponding map datum from the data buffer then; Then, revise the display parameter in the map display object structure, the latest position that is used to preserve screen; At last, come map making from the data buffer, finish the translation of map by the geodata that interface display module reads after the coordinate conversion.
Referring to Fig. 5, introduce and the similar map convergent-divergent process of map translation: after the map that interface display module receives the user dwindles/amplify request, send map for the GIS module and dwindle/amplify message, the GIS engine modules is according to dwindling in this message/amplifying parameters, calculate the position after display screen dwindles/amplifies, judge whether that new/old map block moves into/shift out the screen scope; If there is new map block to move into screen, the piece by calculate obtaining all new map blocks number then, visit geographical data directory file then, obtain the index value of all new map blocks, visit after geographical data file obtains corresponding map datum according to these index values again, send it to the data buffer in the GIS engine modules, and the coordinate conversion function that is called wherein by the GIS engine modules carries out coordinate conversion to map datum, obtain the screen display coordinate of this portable terminal; If the map block of haveing been friends in the past shifts out screen, also by calculating the piece number that obtains all once visited place segments, then from data buffer deletion and these map blocks number corresponding map datum; After finishing interpolation or deletion map block, judge whether again and will carry out conversion the figure layer; If conversion, then the figure layer data that will be increased behind the current engineer's scale by previous scale change reads to the data buffer, and delete the old figure layer data that no longer shows under the current engineer's scale from the data buffer; If current state is then kept in not conversion; Revise the display parameter in the map display object structure then, to preserve the latest position of screen; At last, give interface display module with the data transfer in the data buffer, repaint map, that realizes map dwindles/amplifies displaying.
In portable terminal carries out localized demonstration, translation, amplifies or dwindles to map process, the inventive method can also be carried out following one or multinomial operation steps: business such as location, path trace, point of interest inquiry, optimal path retrieval, query history track; Introduce it below respectively in detail.
Characteristic as geographical location information service: positioning service is considered to a bright spot in the following mobile value-added service always and is subjected to the common concern of industry.With respect to traditional based on network location technology, the present invention adopts the GPS location technology, and precision is higher, and because provide the localization service of being based on portable terminal self, makes that the real-time of location is better, and operation is convenient more.This operation steps relates to a plurality of software function modules such as interface display module, GPS receiver module, locating module, GIS engine modules and database management module in the portable terminal, and this service is to finish by obtaining the GPS positional information with built-in GPS locating device or external GPS locating device alternately by the bluetooth connected mode.
Referring to Fig. 6, introduce the location technology in the inventive method, comprise following operation steps:
(1) after the GPS receiver module in the portable terminal receives the gps signal that built-in GPS locating device or external GPS locating device send by the bluetooth connected mode, hands to locating module.
(2) locating module is resolved the RMC format data frame of the locator data that comprises longitude and latitude and speed in this gps data, and the GPS locator data of the employing ASCII that will extract coding is converted to the floating type data, the coordinate conversion function that calls then in the GIS engine modules carries out coordinate conversion to these data, to obtain the screen display coordinate of this portable terminal.
Because the gps data in the transmission is encoded with the NMEA-0183 communications protocol format at present, therefore the inventive method must be carried out the parsing of position data by locating module to this gps data that receives earlier before the gps data that receives is used.Because the locator data (as longitude and latitude, speed etc.) that people are concerned about is to obtain from the Frame of RMC form, therefore receives only the Frame of RMC form, and this format data frame is resolved.Simultaneously because the gps data frame adopts ASCII to encode, therefore the locator data that extracts to be converted to floating type, the coordinate conversion function that calls then in the GIS engine modules carries out coordinate conversion to these data, could obtain the screen display coordinate of portable terminal.
(3) interface display module is presented at this portable terminal position on the map of mobile terminal screen; Finish the positioning flow operation; At this moment, if started the writing function of historical track, then simultaneously this locating information is deposited in the historical track database by database management module;
(4) if the user does not disconnect bluetooth to be connected, then the GPS receiver module will receive the GPS locator data that built-in GPS locating device or external GPS locating device send all the time, and like this, after the user moved, the customer location that shows on map also can be moved; Simultaneously, these GPS locator datas will be recorded in the historical track database continuously, form the historical track record; The request in the query history path that can trigger according to the user on the map of mobile terminal screen comes query history paths record table, and shows this portable terminal once historical movement track in the past on map.
When finishing the self poisoning business of portable terminal, the present invention can send to the path trace server by wireless network with short message with the GPS locator data that is obtained by the GPS receiver module, realizing route monitoring and follow-up service.This business is specially adapted to the monitoring of logistics company to logistics vehicles, wrecked personnel's relief, public security system etc.
Referring to Fig. 7, specifically introduce among the present invention and the similar path trace service of location technology: main the road is through tracking module by the GPS receiver module in the portable terminal, and locating module and wireless communication module are finished.
(1) after the GPS receiver module in the portable terminal receives the gps signal that built-in GPS locating device or external GPS locating device send by the bluetooth connected mode, carry out the RMC data frame analyzing, after extracting locating information, directly gps data is transferred to the path trace module.Need to prove: do not carry out conversion of floating-point graphic data and coordinate transform this moment, this two parts work is all finished by server.
(2) path trace module invokes wireless communication module, the gps data that receives is encapsulated as the short message of text formatting with the self-defining data frame format after, send to the path trace server.
Portable terminal sends way of short messages to the path trace server two kinds: manually with automatic, the former is the transmission by user's manual control data; The latter then is set by the user transmitting time and sends at interval, and after entering setting-up time, portable terminal sends data automatically according to the time interval of setting, and need not artificial participation.
Because portable terminal adopts the communication mode send SMS message to the path trace server, be the content of textual form and short message transmits, this also is directly to send with the gps data of text formatting coding not resolve the reason of handling with coding and decoding.Be that portable terminal of the present invention and server carry out the mutual self-defining data frame format of gps data below: first term is Short Message Identifier MVGSMS, it is tactic time and spatial positional information: type of message thereafter, date, time, longitude, latitude, height above sea level, speed, direction, conclusion " This is GPS SMS! ", wherein all use comma as separator between each data item.Need to prove that in the self-defining data frame format, conclusion also can be the markup sentence that other literal are formed, separator also is not limited to comma, and other contain the punctuation mark of setting meaning and all can be used as separator.
| MVGSMS | ， | Type of message | ， | Date | ， | Time | ， | Longitude | ， | Latitude | ， | Height above sea level | ， | Speed | ， | Direction | ， | This is?GPS SMS！ |
(3) the path trace server no longer carries out conversion of floating-point graphic data and coordinate transform to the short message that receives, only it is carried out the RMC data frame analyzing, directly extract the GPS locator data in this short message, just can realize monitoring and following the tracks of according to of the motion of these data to this portable terminal.This path trace server or website are set directly in the logistics company or public security organ that needs monitoring vehicle usually.
In geographical location information service, the user also would like to know the address or the geographic position of enterprises and institutions such as some own interested commercial buildings, cinema, supermarket, hospital, school except wondering self position.The point of interest inquiry service is exactly to satisfy the business of this demand of user.At present, traditional point of interest inquiry business is finished by server, and system of the present invention all is stored in all interest point informations in the portable terminal, therefore, the user only need carry portable terminal just can enjoy the business of this localization under off-line case, and needn't worry to be subjected to the obstruction and the influence of communication network.
The point of interest inquiry service is mainly worked in coordination with by point of interest enquiry module, interface display module, GIS engine modules, database management module and wireless communication module and is finished.
Referring to Fig. 8, introduce the dual mode of inquiry point of interest respectively: inquire about and press site polling by name.
Introduce fairly simple the inquiring about of operation steps earlier by name:
(101) user imports the point of interest title, and interface display module is handed to the point of interest enquiry module after receiving the point of interest title that this user will inquire about.
(102) the point of interest enquiry module calls database management module according to this point of interest title visit interest point data base, adopt the fuzzy matching mode to inquire about the point of interest that is complementary with this title, and all related interests points that will inquire present with tabular form, do further selection for the user.
(103) portable terminal is according to a concrete point of interest of user's selection, successively inquire about geodata index file and geodata file, obtain the coordinate figure of this point of interest, after carrying out coordinate transform by the GIS engine modules again, send the coordinate of this point of interest to interface display module, so that the point of interest particular location is presented on the map of mobile terminal screen.
(104) finish the local search of above-mentioned point of interest after, if portable terminal adopts GPRS to communicate by letter to carry out mutual with server again, can obtain the more details of this point of interest.
Operation steps at certain place perimeter query point of interest of setting is:
(111) interface display module receive user input the needs inquiry be after the center of circle, setpoint distance are the region of search and point of interest type information of radius, to hand to the point of interest enquiry module with certain place.
(112) the point of interest enquiry module calls database management module and inquires all relevant points of interest according to this point of interest type with the geodata file in the hunting zone of setting, and these points of interest are presented with tabular form, do further selection for the user.
(113) portable terminal is according to the concrete point of interest of user's selection, successively inquire about geodata index file and geodata file, obtain the coordinate figure of this point of interest, after carrying out coordinate transform by the GIS engine modules again, send the coordinate of this point of interest to interface display module, so that the point of interest particular location is presented on the map of mobile terminal screen.
(114) finish the local search of above-mentioned point of interest after, if portable terminal adopts GPRS to communicate by letter to carry out mutual with server again, can obtain the more details of this point of interest.
Referring to Fig. 9, introduce the inventive method and finish point of interest inquiry and after showing the point of interest position on the map, the concrete operations step of the analysis of the optimal path that is provided and search service:
(1) user can carry out following two kinds of processing to the point of interest that inquires: looking point of interest is departure place or destination.The former is by user's named place of destination, and the latter wants the user to specify the departure place.
Interface display module receives departure place and/or the destination that the user sets, and the mode of setting departure place and/or destination has three kinds: manually import the point of interest name, assigned address or current mobile terminal position on map; The concrete name of wherein manually importing point of interest is after importing the point of interest name by the user, adopts the operation steps of aforementioned inquiry point of interest, obtain the coordinate of this point of interest after, with this route searching calculating parameter as departure place or destination; After assigned address on the map is to specify certain place on the map at screen with cursor or writing pencil, with this point coordinate as the route searching calculating parameter; With the current mobile terminal position is that the anchor point coordinate that obtained under the GPS station-keeping mode is as the route searching calculating parameter.
(2) finish the setting of departure place and/or destination after, path planning module adopts traditional algorithm to Dijkstra to carry out improved two-way dijkstra's algorithm based on Binary Heap according to two coordinates of departure place of setting and destination to carry out the search and the calculating of optimal path, and in computation process, reduce the route searching space with the bidirectional research mode, improve route searching speed; After calculating is finished, obtain road markings ID.
(3) the GIS engine modules obtains corresponding road geographical spatial data according to road markings ID visit, inquiry geodata file.
(4) interface display module draws the optimal path between departure place and the two places, destination and be presented on the map of screen according to the road geographical spatial data.
Most important path planning module is mainly carried out route searching by the geodata topology file that the GIS engine modules visits data Layer in this business.Because the topological diagram that all node and roads constituted of whole map is very big, can't in internal memory, set up whole topological diagram, therefore whole topological diagram can only be write in the ad hoc file, when carrying out route searching at every turn, read this topology file, and only the part topological diagram in the hunting zone is read in internal memory, to reduce expense to EMS memory occupation.
The inventive method and suitable basis-network system thereof have adopted CPU and the more advanced smart mobile phone equipment of peripheric circuit structure thereof to carry out implementing test, respectively the implementing procedure of machine system and miscellaneous service method is all made to have carried out performance test according to the successful model machine of above-mentioned functions module assembling, result of experiment is desirable, realized goal of the invention, proof the local movable geographic information service method of providing of GPS and portable terminal is provided can normally moves and implement, and can obtain the invention effect of expectation.
Claims (10)
1, a kind of based on the local movable geographic information service method of providing of GPS and portable terminal, it is characterized in that: at first point out the user to carry out the operation that map is selected, carry out map according to user's selection again and switch, and on the screen of portable terminal, show this map; According to user's follow-up selection, continue to carry out following one or multi-mode operation step then:
(1) on mobile terminal screen, this map is carried out localized translation, amplifies or dwindles processing;
(2) the GPS receiver module in the portable terminal receives the gps signal of built-in GPS locating device or the transmission of external GPS locating device, locate the current position of this portable terminal in real time and accurately, and on display screen, show compass that is used to point the direction and the positional parameter that comprises number of satellites, longitude, latitude, height above sea level, speed, direction;
(3) the GPS receiver module in the portable terminal sends to path trace server by wireless network with short message or GPRS mode with the gps data of its acquisition, so that by the path trace server this portable terminal realizing route is monitored and followed the tracks of; This portable terminal is preserved the GPS locator data that it continues to obtain simultaneously, forms the historical track record;
(4) portable terminal receives the point of interest title that will inquire about of user input by interface display module or the peripheral point of interest in certain place carries out respectively by after name inquiry or the perimeter query, the point of interest tabulation that searches is presented, do further selection for the user, and the point of interest particular location that the user is selected is presented on the map of mobile terminal screen; And after finishing the local locating query of point of interest, carry out to obtain the more details of point of interest alternately with server again;
(5), be presented on the map of portable terminal the optimal path between these two places is outstanding according to user input or departure place and/or the destination directly on the map of screen, set; Or
(6) if store user's historical track data in the portable terminal, then, can on screen, show the circuit that this user once passed by with historical track according to user's request.
2, method according to claim 1, it is characterized in that: the operation steps of described displayed map is: after portable terminal receives the map menu item instruction that the user selects, wants to browse, visit initial configuration file reads the configuration data that map shows, these configuration parameters is stored into the map display object structure in this configuration file again and sends the GIS engine modules to; The GIS engine modules is calculated the viewing area of this map this moment: the map block that promptly shows according to these configuration parameters on screen; Again according to the map block that calculates number set, visit geographical data directory file and obtain the correspondingly index value of segment, visit geographical data file according to these index values then and obtain the corresponding map data, again these map datums are sent to the data buffer in the GIS engine modules, and the coordinate conversion function that is called wherein by the GIS engine modules carries out coordinate conversion to map datum, to obtain the screen display coordinate of this portable terminal; Come map making by the geodata that interface display module reads after the coordinate conversion from this data buffer, realize the demonstration of map.
3, method according to claim 1, it is characterized in that: in the described step (1), the operation steps of map being carried out translation is: the interface display module of portable terminal receives user's request, send map translation message for the GIS engine modules, the GIS engine modules is according to the translation direction in the translation message, position after the translation of calculating display screen, and judge whether that new/old map block moves into/shift out screen; If there is new map block to move into screen, the piece by calculate obtaining all new map blocks number then, visit geographical data directory file then, obtain the correspondingly index value of segment, visit after geographical data file obtains the corresponding map data according to these index values again, send it to the data buffer in the GIS engine modules, and the coordinate conversion function that is called wherein by the GIS engine modules carries out coordinate conversion to map datum, to obtain the screen display coordinate of portable terminal; If the map block of haveing been friends in the past shifts out screen, also by calculating the whole pieces number that obtain these once visited place segments, deletion and these pieces number corresponding map datum from the data buffer then; Then, revise the display parameter in the map display object structure, the latest position that is used to preserve screen; At last, come map making from the data buffer, realize the translation of map by the geodata that interface display module reads after the coordinate conversion.
4, method according to claim 1, it is characterized in that: in the described step (1), the operation steps that map is dwindled/amplifies is: interface display module receives the user map is dwindled/amplify request, send map for the GIS engine modules and dwindle/amplify message, the GIS engine modules is according to dwindling or amplifying parameters in this message, calculate the boundary position after display screen dwindles/amplifies, judge whether that new/old map block moves into/shift out screen; If there is new map block to move into screen, the piece by calculate obtaining all new map blocks number then, visit geographical data directory file then, obtain the index value of all new map blocks, visit after geographical data file obtains corresponding map datum according to these index values again, send it to the data buffer in the GIS engine modules, and the coordinate conversion function that is called wherein by the GIS engine modules carries out coordinate conversion to map datum, to obtain the screen display coordinate of this portable terminal; If the map block of haveing been friends in the past shifts out screen, also by calculating the piece number that obtains all once visited place segments, then from data buffer deletion and these map blocks number corresponding map datum; After finishing interpolation or deletion map block, judge whether again and will carry out conversion the figure layer; If conversion, then the figure layer data that will be increased behind the current engineer's scale by previous scale change reads to the data buffer, and delete the old figure layer data that no longer shows under the current engineer's scale from the data buffer; If current state is then kept in not conversion; Revise the display parameter in the map display object structure then, the latest position that is used to preserve screen; At last, give interface display module with the data transfer in the data buffer, repaint map, that realizes map dwindles/amplifies displaying.
5, method according to claim 1 is characterized in that: described step (2) further comprises following content of operation:
(21) after the GPS receiver module in the portable terminal receives the gps signal that built-in GPS locating device or external GPS locating device send by bluetooth, hand to locating module;
(22) locating module is resolved the RMC format data frame of the locator data that comprises longitude and latitude and speed in this gps data, and the GPS locator data of the employing ASCII that will extract coding is converted to the floating type data, the coordinate conversion function that calls then in the GIS engine modules carries out coordinate conversion to these data, to obtain the screen display coordinate of this portable terminal;
(23) interface display module is presented at this portable terminal position on the map of mobile terminal screen, finishes the positioning flow operation; At this moment, if started the writing function of historical track, then simultaneously this locating information is deposited in the historical track database by database management module;
(24) if the user does not disconnect bluetooth to be connected, then the GPS receiver module will receive the GPS locator data all the time, and like this, after the user moved, the customer location that shows on map also can be moved; Simultaneously, these GPS locator datas will be recorded in the historical track database continuously, form the historical track record; The request in the query history path that can trigger according to the user on the map of mobile terminal screen comes query history paths record table, and shows this portable terminal once historical movement track in the past on map.
6, method according to claim 1 is characterized in that: described step (3) further comprises following content of operation:
(31) after the GPS receiver module in the portable terminal receives the gps signal that built-in GPS locating device or external GPS locating device send by bluetooth, hand to the path trace module;
(32) path trace module invokes wireless communication module, the gps data that receives is encapsulated as the short message of text formatting with the self-defining data frame format after, send to the path trace server;
(33) the path trace server is not done conversion of floating-point graphic data and coordinate transform to the short message that receives, only it is carried out the RMC data frame analyzing, directly extract the GPS locator data in this short message, just can realize monitoring and following the tracks of according to of the motion of these data to this portable terminal.
7, method according to claim 6 is characterized in that: the mode that described portable terminal sends SMS message to the path trace server has two kinds: manually with automatic, the former is the transmission by user's manual control data; The latter then is set by the user transmitting time and sends at interval, and after entering setting-up time, portable terminal sends data automatically according to the time interval of setting, and need not artificial participation;
The locating information of described portable terminal in the short message that the path trace server sends is to adopt following self-defining data frame format: first term is Short Message Identifier MVGSMS, it is tactic time and spatial positional information: type of message thereafter, date, time, longitude, latitude, height above sea level, speed, direction, the conclusion of setting, wherein between each data item all with other punctuation mark of comma or setting as separator.
8, method according to claim 1 is characterized in that: described step (4) further comprises following content of operation:
(401) after interface display module receives the point of interest title that will inquire about of user's input, hand to the point of interest enquiry module;
(402) the point of interest enquiry module calls database management module according to this point of interest title visit interest point data base, adopt the fuzzy matching mode to inquire about the point of interest that is complementary with this title, and all related interests points that will inquire present with tabular form, do further selection for the user;
(403) portable terminal is according to the concrete point of interest of user's selection, successively inquire about geodata index file and geodata file, obtain the coordinate figure of this point of interest, after carrying out coordinate transform by the GIS engine modules again, send the coordinate of this point of interest to interface display module, so that the point of interest particular location is presented on the map of mobile terminal screen;
(404) finish the local search of above-mentioned point of interest after, if portable terminal adopts GPRS to communicate by letter to carry out mutual with server again, can obtain the more details of this point of interest.
9, method according to claim 1 is characterized in that: described step (4) further comprises following content of operation:
(411) interface display module receive user input the needs inquiry be after the center of circle, setpoint distance are the zone and point of interest type information of radius, to hand to the point of interest enquiry module with certain place;
(412) the point of interest enquiry module calls database management module and inquires all relevant points of interest according to this point of interest type with the geodata file in the hunting zone of setting, and these points of interest are presented with tabular form, do further selection for the user;
(413) portable terminal is according to the concrete point of interest of user's selection, successively inquire about geodata index file and geodata file, obtain the coordinate figure of this point of interest, after carrying out coordinate transform by the GIS engine modules again, send the coordinate of this point of interest to interface display module, so that the point of interest particular location is presented on the map of mobile terminal screen;
(414) finish the local search of above-mentioned point of interest after, if portable terminal adopts GPRS to communicate by letter to carry out mutual with server again, can obtain the more details of this point of interest.
10, method according to claim 1 is characterized in that: described step (5) further comprises following content of operation:
(51) interface display module receives departure place and/or the destination that the user sets, and the setting means of described departure place and/or destination has three kinds: manually import the point of interest name, assigned address or current mobile terminal position on map; Wherein manually importing the point of interest name is after importing the point of interest name by the user, adopts the inquiry point of interest method of described step (3), behind the coordinate of acquisition point of interest, with this route searching calculating parameter as departure place or purpose; After assigned address on the map is to specify certain place on the map at screen with cursor or writing pencil, with this point coordinate as the route searching calculating parameter; With the current mobile terminal position is that the anchor point coordinate that obtained under the GPS station-keeping mode is as the route searching calculating parameter;
(52) path planning module adopts traditional algorithm to Di Jiesitela Dijkstra to carry out improved two-way dijkstra's algorithm based on Binary Heap according to two coordinates of departure place of setting and destination to carry out the search and the calculating of optimal path, and in computation process, reduce the route searching space with the bidirectional research mode, improve route searching speed; After calculating is finished, obtain road markings ID;
(53) the GIS engine modules obtains corresponding road geographical spatial data according to road markings ID visit, inquiry geodata file,
(54) interface display module draws the optimal path between departure place and the two places, destination and be presented on the map of screen according to the road geographical spatial data.
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