CN101346000B - System for providing local mobile geographic information service based on GPS and mobile terminal - Google Patents

System for providing local mobile geographic information service based on GPS and mobile terminal Download PDF

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CN101346000B
CN101346000B CN200810117352XA CN200810117352A CN101346000B CN 101346000 B CN101346000 B CN 101346000B CN 200810117352X A CN200810117352X A CN 200810117352XA CN 200810117352 A CN200810117352 A CN 200810117352A CN 101346000 B CN101346000 B CN 101346000B
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data
file
map
module
index
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CN200810117352XA
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CN101346000A (en
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谢东亮
陈正东
佟双
熊鹏
李建林
吴金宇
王璐
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方圆信通科技(北京)有限公司
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Abstract

The invention relates to a system to provide local mobile geographic information service based on GPS and mobile terminal. The system comprises: a wireless communication network, a GPS position apparatus and mobile terminal, and an internet and path tracking server. The innovation of the invention is adding the following software functional modules in the mobile terminal: a wireless communication module, a GPS receiving module, an interface displaying module, an interest point inquiring module, a path planning module, a positioning module, a path tracking module, a GIS engine module, a database management module and a data layer made up of an interest point database, a geographic data file, a geographic data index file, a geographic data topological file and a initialization configuration file. The system achieves the advantages of simple, practical, smart in data layer design, convenient in inquiring, low in cost and easy to implement. For storing geographic space data and integrating many software functional modules in the mobile terminal, the system in the invention enable the user to enjoy localized real time geographic space position service conveniently at any moment with less dependence on the server.

Description

System based on the local movable geographic information service of providing of GPS and portable terminal

Technical field

The present invention relates to a kind of communication system 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 BasedService) system, use this system, can select to consult, show local map and this map is carried out the convergent-divergent processing, and realize location, functions such as inquiry 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 extensive 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, GIS-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 investigation, environmental assessment, hazard prediction, the territory management, urban planning, post and telecommunications, communications and transportation, military public security, hydraulic and electric engineering, the communal facility management, agriculture forest and husbandry, statistics, nearly all field such as trade financing has all obtained extensive use, 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 information system based on the management geographical space object of data base management system (DBMS), is that operand is the fundamental difference of GIS-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 latest 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 geographical 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, memory, 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 can not realize on this locality-portable terminal, but 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 unsteadiness 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 of above-mentioned defective that can solve prior art, based on the system of the local movable geographic information service of providing of GPS and portable terminal, this system can 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, with remedy when front desktop generalized information system poor mobility and thin-client pattern real-time poor, thereby the deficiency of geospatial location information service anywhere or anytime can't be provided.

In order to achieve the above object, the invention provides a kind of system, comprise wireless communication networks, GPS positioner and portable terminal based on the local movable geographic information service of providing of GPS and portable terminal, and internet and path trace server; Described 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; It is characterized in that described portable terminal is provided with following software function module: 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 forming by interest point data base, geodata file, geodata index file, geodata topology file and initial configuration file; Wherein:

The GIS engine modules, be the control centre 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 search is calculated, so that according to the departure place and the destination of user's 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 according to the point of interest name of setting or is set the function of finishing the inquiry interest point information around the place, and in carrying out on every side query script, can also carry out the inquiry of special theme; After inquiring concrete point of interest, call the optimal path that path planning module determines to go to this point of interest again;

Interface display module as the human-computer interaction interface of this portable terminal, 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 the external GPS positioner, to obtain and to resolve 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 and HTML (Hypertext Markup Language) HTTP.

The present invention is a kind of system based on the local movable geographic information service of providing of GPS and portable terminal, this system is under the condition of existing network system and network element, an excellent performance that develops at portable terminal, the mobile generalized information system of perfect in shape and function, adopt system of the present invention, owing in portable terminal, stored geographical spatial data and integrated many software function modules that the geospatial location service can be provided of magnanimity, make that the user can be under the prerequisite that significantly reduces the dependence of server, at any time, enjoy localization expediently, 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 system of the present invention is: structure is formed simple, practical, and the design of data Layer is ingenious, inquiry is convenient, with low cost, realizes easily; Only need portable terminal is set corresponding software function module and data Layer, just can realize the mobile geographical location information service of localization.And system of the present invention has following characteristics: (1) mobility is strong, can be whenever and wherever possible provides information service based on the geographical position to the user.(2) traffic is little, expense is low: because most of function all is to realize on portable terminal, the i.e. localization of so-called service, few with the communication interaction of server, effectively reduce the traffic of portable terminal and server end, also make the user's communications expense significantly reduce, thereby can attract and expand more customer group.(3) real-time height owing to many business all realize in localization, not only need not be worried to cause service disruption maybe can't use service because of the communication quality difference of communication link, and the time that more obvious advantage is a query-related information accelerates greatly.(4) flexibility 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 is specially adapted to 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.

Description of drawings

Fig. 1 the present invention is based on GPS and portable terminal to provide the mobile terminal software functional module in the system of local movable geographic information service and the structure of data Layer to form schematic diagram.

Fig. 2 is the geodata file format schematic diagram in the portable terminal of the present invention.

Fig. 3 is second level indexed file structure figure in the geodata index file of portable terminal of the present invention.

Fig. 4 is first order indexed file structure figure in the geodata index file of portable terminal of the present invention.

Fig. 5 is the operating process schematic diagram of portable terminal retrieval of the present invention, inquiry geographical spatial data.

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.

The system that the local movable geographic information service of providing of GPS and portable terminal is provided is by wireless communication networks and GPS positioner, internet and path trace server, and comprise having Symbian, Windows Mobile, the smart mobile phone of Linux or other operating system, handheld pcs, personal digital assistant PDA or have picture and text inputs, the mobile communication terminal of processing and Presentation Function is formed, wherein communication network and related network elements all are existing equipment, and wherein key is to have set up a plurality of software function modules (referring to Fig. 1) in portable terminal: wireless communication module, the GPS receiver module, interface display module, the point of interest enquiry module, path planning module, locating module, the path trace module, the GIS engine modules, database management module, and by interest point data base, the geodata file, the geodata index file, the data Layer that geodata topology file and initial configuration file are formed.Following mask body is introduced its 26S Proteasome Structure and Function:

The GIS engine modules, be the control centre 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 search is calculated, so that according to the departure place and the destination of user's 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 on every side query script, the user can also carry out special theme inquiry, as inquires about the restaurant of periphery, shop etc.After inquiring concrete point of interest, can call the optimal path that path planning module determines to go to this point of interest, 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 the external GPS positioner, 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 GIS-Geographic Information System GIS mainly comprises parts such as hardware, software, method and data; Wherein the various hardware and softwares of computer provide operational environment for the construction and the operation of GIS-Geographic Information System; Method adopts any method directly to influence systematic function for operation and the management of GIS provide concrete solution, influences the availability and the maintainability of system; Data then are the important contents of GIS, also are the soul and the life of generalized information system.The tissue of data and processing are the key links during the GIS application system is built, and relate to many problems.For example: the data of selecting which kind of (or which) engineer's scale, can the precision of these data meet the demands, and can its form by related software integrated or adopt, and adopts which kind of method that data are carried out quick search and processing, adopt which kind of method data are upgraded and to be safeguarded, or the like.

An innovative technology of system of the present invention is that the bottom at the software function module of portable terminal has designed data Layer, be provided with for what system's operation the time need be called at this data Layer and comprise a plurality of files and interest point data bases such as geodata file, geodata index file, geodata topology file and initial configuration file, specifically introduce each building block of this data Layer below respectively:

Referring to Fig. 2, introduce the structure of geodata file earlier: the geographical luv space data in the system of the present invention are provided by third party manufacturer.It is after extracting required related data on the basis of initial data, is stored in the self-defining file according to the form of setting.The suffix of this self-defined file is called .map.

Version field and file verification and field that two fields that begin in this document are this document, they are that the overall situation is unique, version field is used for the version information of identification document, is 1.0 editions at present; Checksum field then prevents to be destroyed the confusion that causes system because of geographical spatial data.The back is the geographical spatial data according to figure layer sequence number sequential storage, all primitive data of each layer are all stored according to the adjacent successively ground connection of size of pel sign ID, the back of last pel of ground floor then begins the storage of second layer pel, by that analogy, up to the All Layers data are all stored.The geographical spatial data of each layer all adopts following three order of the fields storage: the attribute field of pel, pixel coordinates field and pel are drawn field; Wherein, the attribute field of pel is a fixed length, comprises three parts: the coordinate points number of primitive types, pel title and composition pel.The pixel coordinates field then comprises all latitude and longitude value of forming pel, and this field random length, its length depend on the coordinate points number of forming pel.It also is random length that pel is drawn field, is used to identify the color, line style, live width, filling style and other features that comprise pel.

Introduce the geodata index file again: being the good index of geographical spatial data structure of magnanimity, and adopting effective algorithm to realize retrieval fast, is one of research focus of present GIS-Geographic Information System.Especially carry out the GIS application and development in the relatively low embedded device of processor performance, outstanding index structure and algorithm are realized mobile GIS key in application especially.

At present, popular index structure has in desktop system: Quad-Tree index, R-Tree index and grid (Grid) index etc.Through overtesting and research, preceding two kinds of index structures are not suitable for embedded mobile terminal.Therefore, system of the present invention adopts the secondary index structure based on grid.Again because traditional grid index structure exists two big defectives: (1) is not suitable for the uncertain geographical spatial data of store byte length; (2) the too much search efficiency that relatively can reduce geodata is greatly carried out on the border of the geographical space object of grid inside.For this reason, this system adopts the secondary index structure to solve the problem that first defective is brought, and adopts the self adaptation inquiry mode to remedy the low problem of search efficiency that second defective brought.

By experiment and the analysis to geographical spatial data, the geodata index file in the system of the present invention has adopted 100 * 100 the grid partition strategy of taking into account recall precision and precision: horizontal 100, vertical 100, form 10000 grid block records.Division result is that whole map (comprising the map of the interior All Ranges of linchpin of each province, district, municipality directly under the Central Government, the city map or the national map in each large, medium and small city) logically has been divided into 10000 map blocks like this, the corresponding map block of each grid block is so that can inquire the data of corresponding map piece by each grid block.The index entry of all grid blocks all leaves in the index file of the second level.

Referring to Fig. 3, introduce the structure of second level index file: by adopting aforesaid way to divide and second level index file is formed in 10000 grid blocks records of sequential storage, and each grid block record is layer to be that unit is arranged in order to scheme.Three kinds of data of corresponding each geographical space object of storage in each figure layer: promptly pel identifies ID, its minimum outsourcing matrix M BR and index value Index, in the foremost of each figure layer record is the number of the geographical space object indexing in this figure layer index record, i.e. pel number.

According to the definition of secondary grid index, in the index file of the second level, the geographical space object in each grid block record, promptly the number of the index record of pel is inequality.Like this, for the storage organization that adopts file, just be difficult to carry out index value inquiry effectively and rapidly.In order to address this problem, the geodata index file is set up first order index again, so that second level index file is carried out index fast and effectively.

Referring to Fig. 4, introducing the structure of first order index file forms: it is one is the two-dimensional array A[10000 of main sequence to go preface] file of [10] framework, wherein first dimension is totally 10000, corresponding with 10000 grid block records in the index file of the second level, totally 10 of second dimensions, corresponding with 10 figure layers, road joining Node layer is not done storage and is shown; Each array item A[p] q figure layer index value in the value representation first order index file of [q] in p grid block record: the first address of promptly storing related data.

Referring to Fig. 5, introduce all processes of system queries geographical spatial data of the present invention: search in first order index file according to the piece p of the grid block that will inquire about and the figure level number q at place thereof earlier, the figure layer q that obtains the corresponding d of this grid block p is recorded in the index value in the index file of the second level, promptly calculate following formula Loc (p, q)=q+p * x * L, in the formula, natural number p, q represent the sequence number of grid block and the sequence number of figure layer respectively, x is the total number of plies of figure layer of this map file, and L is the size of the shared memory space of index value; Index value to calculate again, being A[p] [q] numerical value is first address, inquiry obtains the position of q figure layer in the required p map block in the index file of the second level, in this figure layer record, each pel sign is compared successively then, after inquiring the index value of required pel, index value with this pel is first address retrieves this pel in the geodata file various correlation values at last, so that various movable geographic information services are provided on portable terminal.For example: the spatial data of all pels of figure layer 0 in the inquiry grid block 3000, then according to formula Loc (3000,0)=0+3000 * 10 * L (L is the size that index value took up space) calculates A[3000] numerical value of [0], in the file of the second level, inquire the position of figure layer 0 in the index block 3000 again according to this index numerical value, in this figure layer record, compare successively then, finally inquire the index value of all pels that will inquire about.Can be first address retrieves all pels in the geodata file various correlation values so just, so that various movable geographic information services are provided on portable terminal with the index value of these pels.

Need to prove, though the above-mentioned two-stage grid index file in the system of the present invention is logically independent mutually, be stored in the same file (geodata index file) but be actually: the index data of first order index file leaves the front in, the index data of second level index file leaves the back of first order index file in, so that the quantity of documents in the minimizing system, just with management, and reduce the I/O operation, improve the speed of retrieval.

In addition, system of the present invention is when the retrieval geographical spatial data, the variation of engineer's scale is adopted the self adaptation adjustment to inquiry mode according to the map: when engineer's scale is big (map amplifies the back), in mobile terminal screen, show, less with the map block number that query region intersects, at this moment, the data of the map block that all and query region are intersected all are considered as falling into fully in the query region scope, and the data of these map blocks are all read in internal memory, whether no longer the border to geographical spatial object compares, intersect with query region so that judge these borders.And when engineer's scale hour (being after map dwindles), map block number that show this moment in mobile terminal screen, that intersect with query region more for a long time, geographical space object for the map block that does not fall into query region fully carries out the border relatively, does not then compare and directly inquiry for the map block that falls into query region fully.The variation of this engineer's scale according to the map and adaptive adjustment inquiry mode are called the self adaptation inquiry.Thereby effectively reduce the number of comparisons of primitive boundary, improve the efficient of data query.

Geodata topology file in the data Layer is the data file that adopts the network topology structure of traditional orthogonal list structure storage, the whole map of record.

After the portable terminal that the initial configuration file is used to store, write down this system starts, some configuration parameters of displayed map and associative operation process thereof: comprise the lower left corner of screen and the upper right corner with respect to the engineer's scale array of the logical coordinates of shown map, shown map, with the piece of the overlapping shown map block in the screen lower left corner and the upper right corner number, the minimum latitude and longitude value of these two map blocks, the demonstration rank of pel text etc.

Interest point data base is the data form of various relevant informations of each point of interest of storage: comprise Data Identification ID, point of interest title, point of interest another name, point of interest classification type, the index value of these data in the geodata file: the address, with and the map block at place identify ID etc.Be the example of an interest point data base in the embodiment of the invention below:

The row name Row type and length Whether be empty The row explanation ?RowID From increasing type NOT?NULL Data ID ?Name VARchar(60) NOT?NULL The point of interest title ?PopName VARchar(30) NOT?NULL The another name of point of interest ?Type UNSIGNED?INTEGER NOT?NULL The point of interest classification type ?Offset UNSIGNED?INTEGER NOT?NULL The address of these data in the geodata file ?BlockID UNSIGNED?INTEGER NOT?NULL The residing map block ID of point of interest

Need to prove, the operation platform that portable terminal provides for above-mentioned various software function modules is any in the following operating system: based on Series 60 systems, WinCE mobile phone operating system, Linux mobile phone operating system, TD-SCDMA cell phone system or other the more configurations of high standard of embedded OS Symbian, can enjoy the mobile geographical location information service of localization at any time for the user.

Portable terminal in the system of the present invention is mutual based on carrying out between each above-mentioned functional module and the data Layer file, and the geospatial location service of localization can be provided for the user well.

System of the present invention has adopted CPU and the more advanced smart mobile phone equipment of peripheric circuit structure thereof to carry out implementing test, carried out the performance test of machine system according to the successful model machine of above-mentioned functions module assembling, result of experiment is more satisfactory, realized goal of the invention, the framework of proof system of the present invention can normally move and implement, and can obtain the invention effect of expectation.

Claims (10)

1. the system based on the local movable geographic information service of providing of GPS and portable terminal comprises wireless communication networks, GPS positioner and portable terminal, and internet and path trace server; Described 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; It is characterized in that described portable terminal is provided with following software function module: 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 forming by interest point data base, geodata file, geodata index file, geodata topology file and initial configuration file; Wherein:
The GIS engine modules, be the control centre 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 search is calculated, so that according to the departure place and the destination of user's 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 according to the point of interest name of setting or is set the function of finishing the inquiry interest point information around the place, and in carrying out on every side query script, can also carry out the inquiry of special theme; After inquiring concrete point of interest, call the optimal path that path planning module determines to go to this point of interest again;
Interface display module as the human-computer interaction interface of this portable terminal, 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 the external GPS positioner, to obtain and to resolve 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 and HTML (Hypertext Markup Language) HTTP.
2. system according to claim 1, it is characterized in that: described geodata file is extract related data from existing original geographical spatial data after, be stored in the self-defining data file by setting form again, its structure is as follows: two fields of beginning are unique in this document, be respectively applied for the identification document version information version field and prevent to be destroyed file verification and the field that causes system's confusion because of geographical spatial data, the back is the geographical spatial data according to figure layer sequence number sequential storage, all primitive data of every layer are then stored according to the adjacent successively ground connection of size of pel sign ID, up to the All Layers data are all stored; The geographical spatial data of each layer all adopts following three order of the fields storage: the attribute field of pel, pixel coordinates field and pel are drawn field; Wherein, the attribute field of pel is a fixed length, comprises three parts: the coordinate points number of primitive types, pel title and composition pel; The pixel coordinates field includes all latitude and longitude value of forming pel, and this field random length, its length depend on the coordinate points number of forming pel; It also is random length that pel is drawn field, is used to identify the color, line style, live width, filling style and other features that comprise pel.
3. system according to claim 1, it is characterized in that: described geodata index file is to realize the index file of the secondary index structure that retrieval fast makes up for employing self adaptation inquiry mode in the geographical spatial data of magnanimity, and it is that this system can realize mobile GIS key in application at embedded device; The secondary index structure of described geodata index file is as follows:
Second level index file is made up of the m * n bar grid block record of sequential storage, wherein m and n are the positive integer greater than 1, this m * n bar grid block record is the even dividing mode with vertical m piece, horizontal n piece, whole map logically is divided into m * n map block and corresponding form, is used for inquiring about the data of map block corresponding with it by each grid block;
Each grid block record is layer to be that unit is arranged in order scheme, three kinds of data of corresponding each geographical space object of storage in each figure layer: promptly pel identifies ID, its minimum outsourcing matrix M BR and index value Index, and the foremost of each figure layer record is the number of the geographical space object indexing in this figure layer index record;
It is the two-dimensional array A[m * n of main sequence to go preface that first order index file is one] file of [x] framework, wherein the x of the total number of plies of figure layer of this geodata file of m, n and expression is the positive integer greater than 1, be used for to each figure layer the geographical space object, be that the index record number second level index file inequality of pel carries out index value inquiry effectively and rapidly; Wherein first dimension is total to m * n item, and corresponding with m * n grid block record in the index file of the second level, second dimension is the x item altogether, and corresponding with x figure layer, road joining Node layer is not done storage and shown; Each array item A[p] q figure layer index value in the value representation first order index file of [q] in p grid block record: the first address of promptly storing related data; In the formula, the span of natural number p and q is respectively [4, m * n] and [2, x];
Above-mentioned secondary grid index file is logically independent mutually, but actual is to be stored in the same file: the index data of first order index file leaves the front in, the index data of second level index file leaves the back of first order index file in, so that the quantity of documents in the minimizing system, just with management, and reduce the I/O operation, improve retrieval rate.
4. system according to claim 3 is characterized in that: the map of All Ranges, the city map or the national map in each large, medium and small city in the linchpin that described whole map is each province, district, municipality directly under the Central Government.
5. system according to claim 3, it is characterized in that: described system is when the inquiry geographical spatial data, search in first order index file according to the piece p of the grid block that will inquire about and the figure level number q at place thereof earlier, obtain this grid block corresponding diagram layer and be recorded in index value in the index file of the second level, promptly calculate following formula Loc (p, q)=q+p * x * L, in the formula, p, q represent the sequence number of grid block and the sequence number of figure layer respectively, x is the total number of plies of figure layer of this map file, and L is the size of the shared memory space of index value; Index value to calculate again, being A[p] [q] numerical value is first address, inquiry obtains the position of q figure layer in the required p map block in the index file of the second level, in this figure layer record, each pel sign is compared successively then, after inquiring the index value of required pel, at last the index value with this pel is first address retrieves this pel in the geodata file various correlation values, so that various movable geographic information services are provided in portable terminal this locality.
6. system according to claim 3, it is characterized in that: the self adaptation inquiry mode that adopts during described system queries geographical spatial data is that the variation of engineer's scale is according to the map carried out the self adaptation adjustment to inquiry mode: when engineer's scale is big, be after map amplifies, in mobile terminal screen, show, less with the map block number that query region intersects, at this moment, the data of the map block that all and query region are intersected all are considered as falling into fully in the query region scope, and the data of these map blocks are all read in internal memory, whether no longer the border to geographical spatial object compares, intersect with query region so that judge these borders; When engineer's scale hour, be after map dwindles, the map block number that shows in mobile terminal screen, intersect with query region is more, will carry out the border relatively this moment to the spatial object of the map block that do not fall into query region fully, then do not compare and directly inquiry for the map block that falls into query region fully; Thereby effectively reduce the number of comparisons of primitive boundary, improve the efficient of data query.
7. system according to claim 1 is characterized in that: described geodata topology file is the data file that adopts the network topology structure of traditional orthogonal list structure storage, the whole map of record.
8. system according to claim 1, it is characterized in that: after recording this system start-up, operation in the described initial configuration file, the configuration parameter on screen in displayed map and the associative operation process thereof: comprise the lower left corner of screen and the upper right corner with respect to the engineer's scale array of the logical coordinates of shown map, shown map, with the piece of the overlapping shown map block in the screen lower left corner and the upper right corner number, the minimum latitude and longitude value of these two map blocks, the demonstration rank of pel text.
9. system according to claim 1 is characterized in that: described interest point data base is the data form of various relevant informations of each point of interest of storage: comprise Data Identification ID, point of interest title, point of interest another name, point of interest classification type, the index value of these data in the geodata file: the address, with and the map block at place identify ID.
10. system according to claim 1, it is characterized in that: the operation platform that described portable terminal provides for above-mentioned various software function modules is any in the following operating system: Series 60 systems, WinCE mobile phone operation based on embedded OS Symbian are blunderbuss, Linux mobile phone operating system, TD-SCDMA cell phone system or other more configurations of high standard, can enjoy the mobile geographical location information service of localization at any time for the user.
CN200810117352XA 2008-07-29 2008-07-29 System for providing local mobile geographic information service based on GPS and mobile terminal CN101346000B (en)

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