CN101741696A - Multi-user real-time cooperative system in distributed geographic information environment - Google Patents
Multi-user real-time cooperative system in distributed geographic information environment Download PDFInfo
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Abstract
The invention relates to the technical field of networked geographic information service and provides a multi-user real-time cooperative system in a distributed geographic information environment and a method thereof. The multi-user real-time cooperative system comprises a client, a network, a server and a distributed spatial database. The client, the network, the server and the distributed spatial database are created in a distributed network environment. The client processes the data of the distributed spatial database through the server and the network. The data of the distributed spatial database logically belongs to the same system, however, the data is physically dispersed on a plurality of stations of the network, and each station of the network has autonomous processing capacity and can execute a local application. A computer at each station at least takes part in the execution of an overall application. The multi-user real-time cooperative system in the distributed geographic information environment can accelerate the processing, management and application and the like of the geographic information data to improve to networking, standardization and shared object, and more easily realizes cooperative application of the large-scale mass spatial data.
Description
Technical field
The present invention relates to networked geographic information services technical field, be used to be implemented in and carry out collaborative calculating of distributed geographic information and cooperation with service on the internet environment, relate in particular to multi-user real-time cooperative system and method thereof in a kind of distributed geographic information environment.
Background technology
Distributed geographic information environment is based on the multi-user virtual environment of internet, World Wide Web (WWW), can be used for issuing geographical multidimensional data, the geographical phenomenon process of simulation and Analysis of Complex, support that visual and not visible geodata is explained, following scene is existing in advance, design planning, collaborative work and group decision-making etc., its principal character is that the multi-user participates in and the communal space.It has broken the restriction of region, make that being distributed in all over the world expert, governability person, trade management person, enterprise, the public etc. can pass through the Internet, local area network (LAN) or inner private network, realizes the method for building up and the application of based on network distributed virtual geographic environmental system.A plurality of fields such as present distributed geographic information environment is cooperated with the expert in shared and visual, the virtual geographical test of geography information, battlefield surroundings emulation, online geographical teaching, public participation decision-making obtain Preliminary Applications.
In the integrated application facet of distributed space data, carry out a kind of scheme that integrated scheme is current comparative maturity based on the space element data, domestic and international many academic departments and administrative department study and implement.In the integrated application of distributed space data, the main effect of space element data is to describe for integrating process provides data object.By metadata provide about the information of data self and the environmental information of storage, integrated system will be found the store status of initial data according to the concrete data demand that the application item index system is set up, and judge thus to have or not the operation that the distributed data collection carries out and change legacy data, generation new data set, individual attribute change etc.Because the particularity of spatial data, the content of geographical space metadata is more complicated than other data metadata, and application efficiency is lower.
Aspect interface specification and standard, since the eighties in 20th century, many countries have strengthened Geographic Information Standardization work, so far, have obtained rapid progress in this field.Relevant with the geography information standard in the world topmost mechanism is geography information/Earth Information industry (Tecnical Committee of Geographic Information/Geomatics of technical committee that International Standards Organization divides into, ISO/TC211), the OGC of association of open geographic information system (Open GIS Consortium, OGC) etc., all formulated the interior standard of scope separately, realization is integrated comprehensively with processing resource and main flow calculating with geographical spatial data, promotes extensive use geographical spatial data interoperable software engineering and product on the information infrastructure aspect.
The integrated aspect of domestic spatial information, Beijing's resource information platform construction is representative, comes into operation in 2006.By this platform, each office of committee of Beijing Municipal Government no longer needs to obtain data by optical disc copy, do not need to buy separately the GIS software platform yet, any needs uses the office of government of Beijing electronic chart to entrust and can obtain the map that the spatial information data interchange platform provides by the government affairs private network, and builds the GIS application system of self based on this.
But these are used because still there is unsolved technical barrier in technical restriction at present, have hindered the popularization and the deep application of distributed collaboration work.Comprehensive present Research both at home and abroad, the distributed geographic information synergistic application also has many weak points, is mainly reflected in:
1, operational efficiency is low: present stage is owing to the restriction of network condition, and the big and complicated characteristic of geographical spatial data data volume, and the efficient that distributed geographic information is used is also very low.How to improve the implementation efficiency of distributed geographic information cooperation, reduce period of reservation of number, improving service performance is the key issue that needs to be resolved hurrily.
2, spatial operation is inconsistent: in the cooperative working process to spatial scene amplify, dwindle, translation, object in the scene is deleted, inserts, is changed operations such as attribute, owing to reasons such as concurrent, renewal speed, operation descriptions, be easy to generate the inconsistent problem of object and scene.
3, User Status is inconsistent: because the distributivity of system and the variability issues of time scale, the user in the virtual cooperative surroundings can not keep the space unanimity each other, causes the observer that the state of object, change procedure felt inconsistent.
4, function is simple: the existing distributed GIS-Geographic Information System realized geographical spatial data online issue, browse and simple query function, the online service function of spatial data is very weak even do not have.
Summary of the invention
The present invention proposes in order to address the above problem just.
In order to address the above problem, the invention provides a kind of " multi-user real-time cooperative technology in the distributed geographic information environment ", CNGI (CNGI) network and IPv6 procotol based on high bandwidth solve user's operational consistency problem in the geography information cooperative system, propose efficient distributed geographic information cooperative mechanism, improved the real-time of multi-user's cooperative system.
Therefore, the present invention the concrete problem that solves comprise:
Based on the distributed geographical spatial information memory model of CNGI Environment Design;
Based on the collaborative work message format of XML, formulate the application layer protocol of multi-user collaborative work under the IPV6 network environment;
The heterogeneous network structure of structure " server-client " and " P2P peer-to-peer network ";
The geographic information server of development support multi-user cooperation;
Embed the collaborative work add-on module in the plug-in unit mode, realize GIS client multi-user real-time cooperative.
Set up multi-user's Collaborative environment under the IPV6 network environment, tentatively realize multi-user shared environment, Multi-User Dimension position real-time perception and the transmission of multi-user's real-time messages.
In order to solve the problems of the technologies described above, the present invention takes following technical scheme to realize:
Multi-user real-time cooperative system in a kind of distributed geographic information environment, comprise client, network, service end and distributed spatial database, described client, network, service end and distributed spatial database are implemented in the distributed network environment, described client is handled the data of distributed spatial database by service end and network, data in the described distributed spatial database logically belong to same system, but physically be dispersed on some websites of described network, and each website of described network has autonomous disposal ability, can carry out local application; The computer of each website also participates in the execution of a global application at least.
Wherein distributed spatial database comprises data application layer, distributed space data engine and spatial Information Service layer; The distributed space data engine is used to receive the spatial data request, selects suitable spatial database, and command translation is become the query statement of database, and concurrent fill order is returned standardized normalized space data; The distributed space data engine also is responsible for the correct execution of Distribution Strategy and the atomicity that guarantees affairs in the distributional environment, its communication subsystem is responsible for transmission command and data between each node of network, and, form final result getting up from the result combinations of several data processors.
On the other hand, the present invention also provides the method for the multi-user real-time cooperative in a kind of distributed geographic information environment, client realizes multi-user real-time cooperative as follows by application server and network remote access data services device in distributed network environment:
S1: create collaboration space: create a collaborative work space by user with create right;
S2: add collaboration space: the user with certain authority can join specific collaboration space, and after joining certain collaboration space, state of user just can be caught by the user in this collaboration space;
S3: in collaboration space, carry out information processing: in collaboration space, can share message and state between each user;
S4: withdraw from collaboration space: the user can withdraw from collaboration space flexibly and comfortably.
The present invention utilizes that CNGI is faster, safer, more characteristics such as can manage solve the technical problem of multi-user real-time cooperative in the distributed geographic information environment, can promote geographic information data processing, management and application etc. to promote the synergistic application of the extensive massive spatial data of easier realization to networking, standardization and shared target.
Description of drawings
Fig. 1 represents the fundamental diagram of distributed space data engine;
Fig. 2 represents that distributed objects of the present invention calls realization mechanism;
Fig. 3 represents that the assembly function position of distributed environment of the present invention constitutes;
Fig. 4 represents geography information cooperative service system structure of the present invention;
Fig. 5 represents resource registering, retrieval and the access mode schematic diagram under the IPV6 network environment;
Fig. 6 represents the MDAC schematic diagram based on the IPV6 network;
Fig. 7 represents based on the three-dimensional collaborative platform schematic network structure of the landform of IPV6;
Fig. 8 represents three-dimensional scenic architectural framework schematic diagram of the present invention;
Fig. 9 represents typical message body schematic diagram of the present invention;
Figure 10 represents collaborative Message Processing flow process of the present invention;
Figure 11 represents the present invention is based on the collaborative work flow chart of three-dimensional scenic.
Embodiment
Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
The hardware configuration of multi-user real-time cooperative system in the distributed geographic information environment provided by the present invention and method institute foundation mainly comprises client, network, service end and the distributed spatial database that is implemented in the distributed network environment, and wherein service end comprises application server and data server.Client can visit service end by B/S (Browser/Server) pattern and/or C/S (Client/Server) pattern that satisfies the different configuration needs of user, by application server and network remote access data services device, service end according to the requirement of client and system to access request organize, optimization process, realization returns result's (data, message etc.) to client to operations such as the visit of the distributed space data in the distributed spatial database, modifications.
The present invention adopts " the multi-user real-time cooperative technology in the distributed geographic information environment " to realize the synergistic application of extensive massive spatial data, set about from a plurality of aspects such as agreement, framework, structure, function combinations, analyze the technical advantage of all kinds of schemes, solve multi-user's man-machine interaction under the distributed environment, the involved technical problem of collaborative work, realize the real-time collaborative work of multi-user colony, and carry out the test of IPV6 protocol network environment, for the GIS live collaboration provides technical guarantee.
To be described in further detail technical scheme of the present invention from aspects such as the specific implementation method of the concrete setting of system, database scheduling strategy, each functional unit and data access modes below.
1, distributed spatial database
(1) definition of distributed spatial database and structure
Distributed spatial database is a spatial data set, these data logically belong to same system, but physically be dispersed on some websites of computer network, and require each website of network to have autonomous disposal ability, can carry out local application.The computer of each website also participates in the execution of a global application at least.So-called global application promptly requires to use communication subsystem at several website access datas.Two important feature of distributed data base among the present invention have been emphasized in this definition: distributivity and logical interdependency.
(2) distributed spatial database scheduling strategy
In the present invention, the core of distributed spatial database is the distributed spatial database engine, be used for the scheduling of distributed space data information, the all operations of distributed spatial database user and spatial database all passes through the transparent addressing space data of this engine, and need not know the network site that it is actual.Each node of spatial database is different relational database, and they are all user service except the child node as whole distributed data base, can also be some local users' services, can break away from big system and exists.
The fundamental diagram of distributed space data engine as shown in Figure 1, user processor is translated into universal space data request command to user command, simultaneously it is responsible for the data transaction of standardization form is become user's form as a result.As shown in Figure 1, distributed spatial database mainly can be divided into three layers: data application layer, distributed space data engine, spatial Information Service layer.
Wherein the superiors are data application layer, this layer can relate to various spatial datas, they may be distributed in different servers and geographical position, by user processor user command is translated into universal space data request command, be dealt into the distributed space data engine, behind the return results, the form that becomes the user to need the data transaction of standardization form uses.
The intermediate layer is the distributed space data engine, is used to receive the spatial data request, selects suitable spatial database, and command translation is become the query statement of database, and concurrent fill order is returned standardized normalized space data.The distributed space data engine also is responsible for the correct execution of Distribution Strategy and the atomicity that guarantees affairs in the distributional environment, its communication subsystem is responsible for transmission command and data between each node of network, combiner forms final result getting up from the result combinations of several data processors.
Orlop is that minimum one deck is the spatial Information Service layer, mainly is the expansion that adds one deck spatial information on relational database or file system, and the spatial Information Service of conformance to standard externally is provided.
2, distributed geographic information functional unit
(1) assembly of distributed environment is realized
For realizing that distributed data is used under the network environment, technology such as the asynchronous method that need to solve functional unit calls, object synchronization, long-range establishment, communication and component programming, the present invention is by transforming encapsulation again to traditional spatial data operating function for this reason, the exploitation distributed objects is realized that application program is distributed to call.Fig. 2 represents that distributed objects of the present invention calls realization mechanism, and as shown in Figure 2, distributed objects comprises:
Active objects: form by counterfoil, agency, main body and standard instance object (Instance).Counterfoil is used for all methods that pre-ferred embodiment can be carried out; Agency's effect is to handle the asynchronous mechanism of calling active objects, and it is used for creating following object, transmits to main body and call and return following object to counterfoil; Main body is responsible for being stored in the formation calling, and handles these requests according to the synchronization policy of appointment, if do not specify synchronization policy, then calls by a FIFO mode and manages; Example then is the standard instance of class.
Following object: be placeholder of result that also unenforced method will be returned.After the method on the active objects was called, active objects will be returned a following object, and this following object is exactly a placeholder of return results.Whether the establishment of following object will depend on the type of call method and the object type of returning, have only to as if can specialize the time, just may create following object.Though following object has similar structure to active objects, following object is not initiatively, and it only comprises a counterfoil and an agency.
Type group: type group is made up of the object or the active objects of same type, and all members' method all is a parallel calling in the group.
Node: node is the least unit of carrying active objects, and an active objects must be created on the node.Can create a plurality of nodes, and node can not be born the same name.System adopts the modularization mode, realizes management of information between distributed space, inquiry and analysis, and functional unit mainly is distributed in service end and client respectively.
(2) component type of distributed environment
Fig. 3 represents that the assembly function position of distributed environment of the present invention constitutes, and as shown in Figure 3, assembly of the present invention can be divided into service end assembly and client component two classes by the logical partitioning of assembly function.
The service end assembly comprises:
System administration services assembly (SysManagement): systems management component, information such as the role of management system, authority, safety, daily record, pattern;
Spatial analysis serviced component (SpacialAnalysis):, provide stacked analysis, buffering to analyze and the network analysis service by service interface;
Space querying serviced component (MapQuery): the spatial relationship inquiry service is provided, comprise comprise, adjacent and pass through inquiry service;
Vector dispatch service assembly (VectorServer):, provide the access service of vector according to the way to manage of atlas, picture library, figure layer and the map sheet of vector data;
Grid dispatch service assembly (ImageServer):, provide not at the same level, different range raster data dispatch service based on grid pyramid index;
Cache management serviced component (CachManagement): for access speed and the concurrency that improves system, by the multi-level buffer management of these assembly implementation space data.
Client component comprises:
Special topic systems management component (GwThemeControl): thematic task management, realize tissue, management to user's thematic information, organize the thematic information of difference in functionality according to user's intention;
Spatial data schedule component (GwVectorManagement): the inlet of client and server access, realize the mutual of client and service end by this assembly;
Space querying assembly (GISMapQuery): the user interface of space querying is provided, parameter is submitted to service, and return the Query Result demonstration:
Vector scheduling, demonstration, inquiry, analytic unit (GwVector): the vector data symbolism that is dispatched to client is shown, provide attribute query, spatial analysis user interface, the display analysis result;
Grid scheduling, demonstration, analytic unit (GwRaster): the raster data that is dispatched to client is shown, provide the grid analysis user interface, the display analysis result;
Statistical analysis assembly (GwDataCom): attribute data is carried out statistical analysis and displaying, realize the integrated of attribute information and spatial information, comprise statistical cartography, classification map, forecast analysis etc.
3, based on the architecture Design of coordination technique
(1) architecture Design
The GIS software majority of main flow only can be supported the independent design and the ability of man-machine interaction of unique user at present, seldom considers the problem of the collaborative work between a plurality of GIS users; Even the GIS that some supports distributed function also only provides each user to revise on versions of data separately, and be sightless, can not support colony's real-time collaborative work significantly this user of other users.The invention provides a kind of " multi-user real-time cooperative mechanism ", can provide technical guarantee for solving the live collaboration that the multi-user participates under the IPV6 network environment based on the GIS environment.
The present invention starts with from all kinds of communications protocol of labor (as HTTP, FTP, P2P etc.), scrutinizing all kinds of ripe network configurations (as server-client network configuration, peer network architecture) characteristics and fully using for reference on the basis of its advantage, provide as mistake! Do not find Reference source.Based on multi-user's cooperative system of GIS, its concrete technical thought is under the shown IPV6 network environment:
Application protocol aspect: designed collaborative work message format, as the application layer protocol of supporting multi-user collaborative work under the IPV6 network environment based on XML;
The network architecture aspect: structure is based on the fusion " server-client " of Transmission Control Protocol and the heterogeneous network structure of " P2P peer-to-peer network ";
Server program aspect: realized multi-user's collaboration services based on Microsoft.Net Framework;
Client-side program aspect: on the basis of " learn window (GeoWindows) 7.0 " software platform, embed the collaborative work add-on module in the plug-in unit mode, make various GIS clients (comprising two-dimentional client and three-dimensional client) all can under loosely-coupled prerequisite, realize multi-user real-time cooperative.
By above-mentioned work, the present invention under the IPV6 network environment based on multi-user's Collaborative environment of GIS, tentatively realized multiple users share GIS environment, Multi-User Dimension position real-time perception under the IPV6 network environment and the transmission of multi-user's real-time messages (supporting multiple transmission of messages modes such as point-to-point, point symmetry groups).
(2) the collaborative assembly of core
The present invention adopts Microsoft Visual Studio 2003/.Net Framework to realize the work of system server.Server has following function:
Can support IPV4 and IPV6 compatiblely;
The message communication mode adopts the HTTP transmission based on XML, is easy to realize interdepartmental system under wide area network or the internet environment, strides the communication of application and integrated;
That the collaborative work support had both been supported was connection-oriented " single user is point-to-point collaborative " and with " multi-user collaborative ", also support " non real-time is worked in coordination with " off-line mode under;
Support simultaneously online number of users＞=100; Time delay＜=2 second.
4, spatial data accessing serviced component design
(1) based on the spatial data service mechanism of IPV6
Resource registering under the IPV6 network environment, discovery and access mechanism, be the present invention to solve another technical problem.Construct a entire flow, need to comprise three class roles in class such as resource provider (Resource Provider), resource registering node (Resource Register Node) and Resource consumers (Resource Consumer) at least from resource registering, resource discovering to resource access.Fig. 5 represents resource registering, retrieval and the access mode schematic diagram under the IPV6 network environment, and as shown in Figure 5, typical resource issue is as described below with access process:
A), resource registering: resource provider is submitted resource registering information to arbitrary resource registering node;
B), resource inventory and node route: this resource registering node deposits log-on message the memory space of this node in, and carries out resource inventory automatically according to the type of submitting resource to, forms the local resource catalog directory of upgrading; Simultaneously, all safeguard and dynamically updating one " can be communicated with the resource registering node table " on each resource registering node, be used to store the routing information of other resource registering nodes that can be communicated with it;
C), resource retrieval: Resource consumers is submitted the resource query request to resource registering node any or that be adjacent;
D), single node log-on message traversal: the resource registering node that receives query requests at first travels through local memory space, then directly object information (resource description information that inquires) is turned back to Resource consumers if retrieve qualified result; If there is not qualified result, then this resource node will travel through " can be communicated with the resource registering node table " of its maintenance, and query requests is transmitted to each resource registering node in the table successively;
E), whole net traversal: receive forwarding inquiries requested resource register node and repeat d) in step, until the directory information inquiry of finishing all register node;
F), resource access: Resource consumers just can utilize the resource description information of returning directly to carry out resource access as if after successfully receiving object information from certain resource registering node.
(2) based on the realization of the spatial data accessing assembly of IPV6
The spatial data accessing assembly is realized according to the principle of " towards agreement " and " is core with the middleware ", the present invention is the MDAC that core provides three quasi-representatives with the middleware: data access is divided into three kinds of typical approach such as direct visit data file, accessing database, visit HTTP service or WebService, adopts Microsoft Visual Studio 2003 to realize MDAC based on .Net Framework on this basis.For the file type data visit, because do not relate to the IP agreement, so development process can be with reference to traditional pattern based on IPV4; And for accessing database, HTTP service or WebService service, then need and will support the function of IPV4 to supporting that IPV6 moves.
Based on the architectural framework of the spatial data accessing assembly of IPV6 as shown in Figure 6, the spatial data accessing assembly has following characteristics:
Adopt .Net to realize;
Support is carried out the reading and writing operation to spatial data files;
Support is to the read-write operation of spatial database.The relevant database platform can be supported Oracle, MicrosoftSQL Server2000 etc., and spatial database adopts the network edition " learn window " data model;
Support is to the visit of spatial data service (based on HTTP XML, the WebService etc. of IPV6).
5, based on the three-dimensional collaborative platform of the landform of CNGI/IPV6
In a specific embodiment of the present invention, serve as that demonstration realizes based on the three-dimensional collaborative platform of the landform of CNGI/IPV6 with the landform three-dimensional applications.
(1) function module design
Based on the three-dimensional collaborative platform network configuration of the landform of IPV6 as shown in Figure 7.Whole platform makes up based on the IPV6 network, can be divided into four class roles by function:
Three-dimensional visualization interactive module: for the user provides interactive environment based on three-dimensional scenic, show and roaming in order to the three-dimensional visualization of realizing basic geography information such as vector, grid, image, place name, and functions such as placename-querying, thematic information management, threedimensional model displaying are provided.Itself does not provide the function of collaborative work the three-dimensional visualization interactive module, can adopt the mode of third party's plug-in unit that support to collaborative work is provided;
The three-dimensional geographic information server: provide spatial data (vector, grid, image, place name etc.) and thematic information service based on the IPv6 network, data can be binary data streams or based on the data flow of XML.The three-dimensional geographic information server supports concentrating type to dispose, and supports the multi-user concurrent visit;
Collaborative work server: to support that multi-user collaborative work is the application server of core.Its Core Feature is user management, the management of user's logging status, collaboration space management, user status notification etc.Collaborative work is the communication core based on the IPv6 network with http protocol and XML, supports clustered deploy(ment) and multi-user (＞=200) visit;
Collaborative communication plug: collaborative communication plug is in order to realize interconnecting of three-Dimension Terrain Visualization module client and collaborative work server, and the two communicates by HTTP and XML.Any user client (comprising the two-dimensional map client) can be by the multi-user collaborative work under collaborative communication plug realization wide area network/internet environment.
(2) three-dimensional geographic information service platform
Fig. 8 represents three-dimensional scenic architectural framework schematic diagram of the present invention, as shown in Figure 8, spatial data management and three-Dimension Terrain Visualization modular platform have adopted the multilayer system framework of taking into account B/S and C/S model, mainly comprise data Layer, multiscale space data management module, spatial Information Service layer, spatial data management assembly and client.The standard compliant industrial specification of communication between each module layer and the component groups, software frame has lasting extensibility, can support centralized and distributed deployment, can support the application of B/S pattern and C/S model simultaneously.
Data Layer
This layer provides the data support for each application system, the network map service), (Web Feature Service: the data source of type such as provides service by modes such as Socket, file access, HTTP, WebService to WFS the network element service) all types of spatial databases, data file, WMS (WebMap Service:.
Spatial data management assembly, spatial Information Service layer and client can directly be visited this data Layer.
The multiscale space data management module
Data processing functions such as this layer is mainly finished data preparation, projection conversion, map sheet is spliced and cut are typical C/S framework.
This layer also comprises three-dimensional scenic management and issue assembly, is used for three-dimensional scenic management and issue.Can pass through various protocols addressing space data (elevation/grid, remote sensing image, vector data etc.), be unit on this basis with the layer, and spatial data is carried out the multiresolution blocking organization and makes up complicated dimensional topography scene.
The spatial Information Service layer
This layer mainly is made up of the contextual data serviced component, and access that can plug-in unit mode support function.
Three-dimensional scenic data, services assembly is that the dimensional topography client provides data, services based on .Net Framework with forms such as binary data stream, XML data flow, supports the multi-user concurrent visit.
The present invention also supports distributed and geographic information services centralized deployment, can issue and shared geography information in large organization and between the network user.
This layer provides service by open Internet agreement with based on the Web services of SOAP for all kinds of clients and application.
The three-Dimension Terrain Visualization client provides dimensional topography visual and interactive tool for the user.By client, the user can realize the dimensional topography seamless roam, supports elevation inquiry, Object Query, distance measuring, along operations such as specified path flight, animation outputs.
Client is carried out data communication by open Internet agreement with based on Web services and the spatial information infrastructure service layer assembly of SOAP, supports typical B/S deployment and operational mode; By increasing the access rights of local resource, also can expand access ability, to support the application of C/S model to local data file.
(3) message body of geography information collaborative work
The structure of message body is the basis of collaboration platform.The present invention is based on XML message body structure as shown in Figure 9, a complete message body mainly is made up of sender, recipient, message content, message policies.
Sender: refer to the user that initiates a message;
The recipient: finger is received user or user's group of message;
Message content: refer to send the content of message, its content can be decided according to concrete application by the user;
Message policies: refer to the strategy that message sends, as the time limit (at once/after a while) that sends, the time that message sends, the number of times that message repeats etc.
After certain user who participates in the collaborative work space sends out the message of compliant, message will be arrived the recipient of appointment by " collaborative work server " quilt " route "; The recipient further handles according to type of message and message parameter more again, as carries out automatic scene location, opening/closing figure layer, increase/modification/deletion geographic element object etc.Its concrete handling process is as shown in figure 10:
A) software A (certain participates in the collaborative work client) is according to the collaborative message body of running status structure of self;
B) the collaborative communication plug of software A sends message by http protocol to Collaboration Server;
C) Collaboration Server is transmitted or is broadcasted collaborative message according to the message relevant information;
D) the collaborative communication plug of software B is caught message, handles or shows.
(4) collaborative work flow process
Based on the collaborative work flow process of three-dimensional scenic as shown in figure 11.
A), create collaboration space: by collaborative work space of the user's initiation/establishment with create right, this collaboration space can be man-to-man space, also can be the collaboration space that allows a plurality of users to add.In man-to-man collaboration space, only there are two users can carry out interacting message; In the collaboration space that a plurality of users add, a plurality of users can carry out collaborative work based on the IPV6 network;
B), add collaboration space: the user with certain authority can join specific collaboration space, and after joining certain collaboration space, state of user just can be caught by the user in this collaboration space;
C), the information processing in the collaboration space: in collaboration space, can share message and state between each user.The user can carry out the transmission of any message flexibly and comfortably in this collaboration space, comprise and carry out file transfer etc.;
D), withdraw from collaboration space: the user can withdraw from collaboration space flexibly and comfortably.After last user withdrawed from, this collaboration space will be by auto-destruct.In addition, the keeper of collaboration space can also force to destroy certain collaboration space.
The present invention is based on XML and carry out message construction and communicate by letter, can support IPv6 and IPv4 network compatiblely; Support is created, is managed and destroy based on the collaboration space of wide area network/the Internet; And the support multi-user real-time cooperative, support 200 users simultaneously online at least.
By the present invention, a plurality of users can realize following function in based on the visible environment of Web:
1) map view, placename-querying;
2) but position, the motion state (speed, direction, path etc.) at all user places in the real-time perception collaboration space;
3) can between a plurality of collaboration users, mark shared, visual sharing in real time;
4) can between a plurality of collaboration users, send short text message in real time;
5) can set up " master mode ", with certain user is the master control role, other (strange land) subscription client can be bound master control person's state automatically, move from motion tracking master control person's position to be implemented under the no interaction mode, actions such as switch figure layer, stress model, realize graphic scene and state Real-Time Sharing under wide area network/internet environment.
Though the present invention explains in conjunction with an embodiment; but those skilled in the art can be to wherein some feature appropriate change or apply it to other field addressing the above problem in addition, so all relevant expansions of carrying out on the basis of present embodiment of those skilled in the art and use the protection range that all should fall into the application.
Claims (12)
1. the multi-user real-time cooperative system in the distributed geographic information environment comprises client, network, service end, and it is characterized in that: this system also comprises distributed spatial database,
Described client, network, service end and distributed spatial database are implemented in the distributed network environment, described client is handled the data of distributed spatial database by service end and network, data in the described distributed spatial database logically belong to same system, but physically be dispersed on some websites of described network, and each website of described network has autonomous disposal ability, can carry out local application; The computer of each website also participates in the execution of a global application at least.
2. the multi-user real-time cooperative system in the distributed geographic information environment as claimed in claim 1 is characterized in that described distributed spatial database comprises data application layer, distributed space data engine and spatial Information Service layer;
Wherein said distributed space data engine is used to receive the spatial data request, selects spatial database, and translation is also transmitted fill order, returns the normalized space data; The distributed space data engine also is responsible for the correct execution of Distribution Strategy and the atomicity that guarantees affairs in the distributional environment, its communication subsystem is responsible for transmission command and data between each node of network, and, form final result getting up from the result combinations of several data processors.
3. the multi-user real-time cooperative system in the distributed geographic information environment as claimed in claim 1 or 2, it is characterized in that described service end comprises application server and data server, client is by B/S pattern and/or C/S model access application server, and data server is handled the data message in the distributed spatial database module according to user's request.
4. the multi-user real-time cooperative system in the distributed geographic information environment as claimed in claim 3, it is characterized in that described system can support IPV4 and IPV6 network environment compatiblely, employing is based on the collaborative work message format of XML, as the application layer protocol of supporting multi-user collaborative work under the IPV6 network environment.
5. the multi-user real-time cooperative system in the distributed geographic information environment as claimed in claim 3 is characterized in that embedding the collaborative work add-on module in described client in the plug-in unit mode.
6. the multi-user real-time cooperative system in the distributed geographic information environment as claimed in claim 3, it is characterized in that this system adopts the distributed data under the distributed objects realization network environment to use, described distributed objects comprises active objects, following object, type group and node.
7. the multi-user real-time cooperative system in the distributed geographic information environment as claimed in claim 6 is characterized in that described active objects is made up of counterfoil, agency, main body and example.
8. the multi-user real-time cooperative system in the distributed geographic information environment as claimed in claim 7 is characterized in that:
After the method on the described active objects was called, active objects will be returned a following object, and this following object is exactly a placeholder of return results; Whether the establishment of following object will depend on the type of call method and the object type of returning, have only to as if can specialize the time, just may create following object; Though following object has similar structure to active objects, following object is not initiatively, and it only comprises a counterfoil and an agency.
9. the multi-user real-time cooperative system in the distributed geographic information environment as claimed in claim 6, it is characterized in that described system provides three class MDACs, data access is divided into direct visit data file, accessing database, visit HTTP service or three kinds of approach of WebService.
10. the multi-user real-time cooperative system in the distributed geographic information environment as claimed in claim 3 is characterized in that:
This system provides interactive environment, spatial information and thematic information service based on the visual scene of geography information based on the IPv6 network for the user, and the mode that adopts third party's plug-in unit provides the support to multi-user collaborative work, is that the communication core supports concentrating type to dispose and the multi-user concurrent visit with http protocol and XML;
Described third party's plug-in unit is collaborative communication plug.
11. the multi-user real-time cooperative method in the distributed geographic information environment is characterized in that:
Client realizes multi-user real-time cooperative as follows by application server and network remote access data services device in distributed network environment:
S1: create collaboration space: create a collaborative work space by user with create right;
S2: add collaboration space: the user with certain authority can join specific collaboration space, and after joining certain collaboration space, state of user just can be caught by the user in this collaboration space;
S3: in collaboration space, carry out information processing: in collaboration space, can share message and state between each user;
S4: withdraw from collaboration space: the user can withdraw from collaboration space flexibly and comfortably.
12. the multi-user real-time cooperative method in the distributed geographic information environment as claimed in claim 11 is characterized in that the collaboration space of creating can be man-to-man space in step S1, also can be the collaboration space that allows a plurality of users to add.
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