CN1787522B - Method for registration of web key element service coordinate based on web map service - Google Patents
Method for registration of web key element service coordinate based on web map service Download PDFInfo
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- CN1787522B CN1787522B CN 200510020014 CN200510020014A CN1787522B CN 1787522 B CN1787522 B CN 1787522B CN 200510020014 CN200510020014 CN 200510020014 CN 200510020014 A CN200510020014 A CN 200510020014A CN 1787522 B CN1787522 B CN 1787522B
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Abstract
This invention relates to a method for configuring service coordinate of Web factors based on the Web map service, which applies the coordinate transformation mode of scattering points taking the reference coordinate supported by the WMS service end as the primary standard to convert the WFS service data of different reference systems to the coordinate with the same service data to WMS and bring the geographical data got from different protocol geographical information service into a unified reference frame to create conditions for integrating multi-protocol geographical information service from different stops, plants, services, data sources and space reference systems on the browser.
Description
Technical field
The present invention relates to the network geographic information service system, be specifically related to geography information Web service technology crossing domain, particularly realize sharing and integrated method between the geographic information services of different agreement.
Background technology
Can predict,, how realize that sharing with integrated between the geographic information services of different agreement will become the problem that the geography information field presses for solution along with the development of geographic information services.
At present, OGC Web service work group just is being devoted to set up the Web service standard of open geographic information, purpose is to wish that proposing one can evolve, based on various standards, can seamless integrated various online spatial manipulation and the framework of location-based service, be OWS (OGC Web Services), make that treatment system can be undertaken alternately by XML and HTTP technology between distributed space, and be various online spatial data resource, spatial information from transducer is handled service and location-based service, discovery based on Web, visit, integrate, analyze, utilize and the visual interoperability framework that provides.Three geographic information services Web Map Services (WMS) of its proposition, Web Feature Service (WFS), Web cover the interface definition comparative maturity of service (WCS), can realize sharing of GIS spatial data under the Web environment.The data that the utilization of Web Map Services has geospatial location information generate map.The Web Feature Service is returned the GML coding of geographic element level, and transaction operations such as increase to geographic element, renewal, deletion are provided.The Web service of covering can provide cover data multiple dimensioned, different time sections.
Current domestic and international many GIS software vendor provides the support to WMS one after another in its product, the user can set up various Web Map Services easily, for example MapXtreme4.5.7 can be issued as WMS to the figure layer of managing in the ground plan definition file as resource, ArcIMS9.0 can be issued as the WMS service to ImageServer by the WMSConnector connector, can be issued as the WFS service to FeatureServer by the WFSConnector connector, but lack the integrated client of service collaboration between a plurality of business mens, and the supporting dynamics to WFS and WCS service is not enough, this is because integrated some technical problems that also exist of this three mainly show: also do not have unified service abstraction standard; There is not unified interface to realize; Different services lack effective Coordinate Conversion mechanism when stack; The WFS service that different business mens are realized can't be understood mutually owing to the difference of GML application model and merge; Lack the active data compression mechanism, the efficient of service is comparatively low; The performance mechanism of different vendor's data, services varies.
Serve integrated solution integrated and client-based integrated dual mode based on server end is arranged, based on server end integrated owing to relate to a series of still unsolved difficult problems such as the calling automatically of intellectual search, service, result's the automatic merging of service and server end visual representing, client-based integrated research at present many, but great majority are integrated based on desktop application.For integrated, still there is not ripe report based on the service of Web browser client.
At present, the integrated technology of multi-protocols geographic information services is also very immature, main cause comprises: do not have in various geographic information services under the situation of common reference frame, WFS service data under the different referentials, WCS service data, WMS service data etc. can't be transformed under the identical reference frame, therefore, how the service data under the different reference frames is transformed under the identical reference frame, and considering the efficiency and precision of Coordinate Conversion, is one of integrated key technology of multi-protocols geographic information services.
Summary of the invention
Technical problem to be solved by this invention is: a kind of Web key element service coordinate method for registering based on the Web Map Services is provided, this method is a benchmark with the reference coordinate of WMS service end support, WFS service data under the different referentials is transformed under the identical reference frame with the WMS service data, and the integrated multi-protocols geographic information services that comes from different websites, different vendor, different service, different pieces of information source, different spaces referential creates conditions on the Web browser in order to be implemented in.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
Based on the Web key element service coordinate method for registering of Web Map Services, it comprises:
(1) is used for the value of the georeferencing of Web Map Services is stored in as source coordinate system parameter the step of memory;
(2) value that is used for obtaining the georeferencing of certain one deck from the ability description of Web Feature Service is stored in step the memory as the target-based coordinate system parameter;
(3) with three parametric methods or seven ginseng methods target-based coordinate system parameter and source coordinate system parameter are carried out parameter calculation, the corrected value of output coordinate;
(4) be used for the data of the geographical marking language format that obtains from the Web Feature Service, the coordinate figure that takes out a certain discrete point on this layer is as input, after adding the corrected value of coordinate, obtains the new coordinate figure of this point and is stored in step in the memory;
(5) to each discrete point on this layer circulation step successively (4);
(6) to every layer of Web Feature Service circulation step (2) successively;
(7) the geographical marking language format data behind the output registration.
The value of georeferencing comprises: the value of the number of projection title, projective parameter, the title of projective parameter and projective parameter.
In the such scheme, between step (2) and step (3), also comprise:
Be used for step that target-based coordinate system parameter and source coordinate system parameter are compared, this step can be selected following action:
Target-based coordinate system parameter and source coordinate system parameter matching, execution in step (6);
Or target-based coordinate system parameter and source coordinate system parameter do not match execution in step (3).
Because what the GetMap of WMS request was returned is the picture of having specified forms such as reference frame JPEG, PNG, GIF, can not carry out the coordinate system conversion; And have reference frame information in the GML document that the GetFeature of WFS request is returned the time geological information of geographic element being described, and can carry out the coordinate system conversion, eliminate the difference between reference frame, realize the seamless integrated of geodata.Therefore, do not have in various geographic information services under the situation of common reference frame, the present invention is a benchmark with the reference coordinate of WMS service end support, WFS service data under the different referentials is transformed under the identical reference frame with the WMS service data, the WFS service data can be finished the integrated of isomeric data according to the stacking method of grid and grid, vector and vector, grid and vector then through the scope frame and the coordinate figure information of conversion geographic element type.
Interface according to the service of OGC open geographic information, the present invention proposes the method for registering based on the georeferencing of WMS, adopt the coordinate transform pattern of discrete point, reference coordinate with the support of WMS service end is a benchmark, WFS service data under the different referentials is transformed under the identical reference frame with the WMS service data, to include unified reference frame in from the geodata that the geographic information services of different agreements is obtained, integratedly on the Web browser come from different websites for being implemented in, different vendor, different services, the different pieces of information source, the multi-protocols geographic information services of different spaces referential creates conditions.
The advantage of the inventive method also comprises:
(1) resolving of georeferencing, coordinate transform and the discrete point by adopting WMS realized the registration of geographical marking language format (GML) data of WFS;
(2) transformation parameter that can realize different geographical georeferencings resolves and real-time Coordinate Conversion;
(3) simple, the execution efficient height of the inventive method.
Description of drawings
Fig. 1 is the georeferencing registration flow chart of Web Feature Service based on WMS
Fig. 2 multi-protocols geographic information services data model figure
Embodiment
The inventive method embodiment as shown in Figure 1, it comprises:
(1) is used for the value of the georeferencing of WMS is stored in as source coordinate system parameter the step of memory.
The value of the georeferencing of WMS is obtained from the ability description of WMS.
(2) value that is used for obtaining the georeferencing of certain one deck from the ability description of Web Feature Service is stored in step the memory as the target-based coordinate system parameter.
Be used for step that target-based coordinate system parameter and source coordinate system parameter are compared, this step can be selected following action:
Target-based coordinate system parameter and source coordinate system parameter matching, execution in step (6);
Or target-based coordinate system parameter and source coordinate system parameter do not match execution in step (3).
(3) with three parametric methods or seven ginseng methods target-based coordinate system parameter and source coordinate system parameter are carried out parameter calculation, corrected value dx, dy and the dz of output x, y, z coordinate.
(4) be used for the data of the GML that obtains from the Web Feature Service, coordinate figure x, the y, the z that take out a certain discrete point on this layer are as input, after adding corrected value dx, the dy of coordinate, dz, obtain new coordinate figure x '=x+dx, y '=y+dy, the z '=z+dz of this point and be stored in step in the memory;
(5) to each discrete point on this layer circulation step successively (4);
(6) to every layer of Web Feature Service circulation step (2) successively;
(7) the geographical marking language format data behind the output registration.
The value of georeferencing comprises: the value of the number of projection title, projective parameter, the title of projective parameter and projective parameter.
Present embodiment can be realized by special hardware card.
Obtain the descriptor of geographic information services from service end by the GetCapabilties method, purpose is to serving which figure layer that provides, the response format of scope frame, coordinate reference system information and the service support of each figure layer etc. in extracting from descriptor.The GetObject method of WMSBean is selected to send GetMap according to the user and is asked the WMS service end, obtains the grille picture of information such as specified scope frame, coordinate reference system, form, background colour and transparency.The GetOb ject method of WFSBean sends the DescribeFeatureType request of required key element type, and service end is returned the Schema document of key element type structure, has mainly described the title and the type of key element type attribute data; Send GetFeature request then, service end is returned the geometry and the attribute data of key element in the request figure of the institute layer with the form of GML, and the Schema that obtains by the DescribeFeatureType request finishes the parsing to geographic element.
The also definition that provides unified GML application model useless in the WFS standard, as long as the GML data result that WFS returns satisfies the application model definition that the DescribeFeatureType operation is returned, and this application model definition can be by concrete Web Feature Service implementor definition.Because the ISP often adopts different GML application models, to be benchmark designed the universal parser of GML data and the parser modules of special services is handled in client to the basic element of available GML3.0, realized the analytic uniform of the GML data that the WFS of different vendor provides.In the GML data parsing be set up among the GML that basic geometric type is described and GeoSurf in spatial model mid point, line, planar model between mapping, read geological information, attribute information and the reference frame information of point, line, surface shape key element, generate the internal storage structure WFSLayer of corresponding key element type.
Behind the coordinate registration by the inventive method, can unify operation to the data that obtain from WMS, WFS service as concrete figure layer (WMSLayer and WFSLayer).Data model is inherited from abstract graph layer AbstractLayer respectively and is come as shown in Figure 2, sets up a vector structure to carrying out unified management in the set of abstract graph layer in MapBean.Comprise the realization (as WMSBean) of a Service interface among each AbstractLayer, be used as data set provider and use, the method for the GetObject by the Service interface is obtained data.Thereby in MapBean, generated the map that a width of cloth contains vector and striograph layer, and various data have been drawn the demonstration that is implemented in client.
The concrete figure layer that obtains in the service to WMS, WFS amplifies, dwindles, the realization class of the Service interface by each figure layer during roam operation sends the GetObject request, change the scope frame of request msg, obtain new data, again data are included in the integrated demonstration of unified reference frame in MapBean.For the WFS service data client amplify, dwindle, when roaming for fear of visiting the WFS service end continually, server end will all remove to generate the GML document and be transferred to client simultaneously each operation, this will influence the speed of response greatly, therefore can design buffering in client, the GML metadata cache is got off, add among the corresponding internal storage structure WFSLayer and go, only when needs obtain new data, just communicate with the WFS service end.
Raster map layer to the WMS service carries out a query manipulation by send GetFeatureInfo request realization to service end, X, the Y coordinate of the key element of specifying the layer name that will inquire about in request, expressing with pixel and the key element number of returning, service end is returned is the attribute-name of the key element that inquires and the GML document of property value.Can resolve the GetFeatureInfo response and generate corresponding key element structure set GeoSurfFeatureCollection, set up the corresponding relation of the attribute name-value pair of key element, realize the some query function of WMS service data.
The GML that serves the element structure that returns from WFS describes and generates corresponding internal storage structure WFSLayer, just can carry out point, line, broken line, rectangle, circle and polygon inquiry to the WFS service data, the method of inquiry is to set up the key element collection GeoSurfFeatureCollection example of a sky earlier, by all key elements in the figure layer are traveled through, will the key element in query context join key element and concentrate, and Query Result is shown.Can realize easily simultaneously the WFS data are carried out carrying out classification or ladder demonstration by a certain property value, change the Show Color of key element, functions such as symbolic library.
Claims (2)
1. based on the Web key element service coordinate method for registering of Web Map Services, it is characterized in that: it comprises:
(1) is used for the value of the georeferencing of Web Map Services is stored in as source coordinate system parameter the step of memory;
(2) value that is used for obtaining the georeferencing of certain one deck from the ability description of Web Feature Service is stored in step the memory as the target-based coordinate system parameter;
(3) with three parametric methods or seven ginseng methods target-based coordinate system parameter and source coordinate system parameter are carried out parameter calculation, the corrected value of output coordinate;
(4) be used for the data of the geographical marking language format that obtains from the Web Feature Service, the coordinate figure that takes out a certain discrete point on this layer is as input, after adding the corrected value of coordinate, obtains the new coordinate figure of this point and is stored in step in the memory;
(5) to each discrete point on this layer circulation step successively (4);
(6) to every layer of Web Feature Service circulation step (2) successively;
(7) the geographical marking language format data behind the output registration;
The value of georeferencing comprises: the value of the number of projection title, projective parameter, the title of projective parameter and projective parameter.
2. the method for claim 1 is characterized in that: also comprise between step (2) and step (3):
Be used for step that target-based coordinate system parameter and source coordinate system parameter are compared, this step can be selected following action:
Target-based coordinate system parameter and source coordinate system parameter matching, execution in step (6);
Or target-based coordinate system parameter and source coordinate system parameter do not match execution in step (3).
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| CN115809244A (en) * | 2022-11-20 | 2023-03-17 | 北京泰策科技有限公司 | Massive spatial data access, processing and release method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1435790A (en) * | 2002-01-30 | 2003-08-13 | 上海众恒信息产业有限公司 | Geographic information system on-line analysis data model and attribute data relating method |
| JP2004101780A (en) * | 2002-09-09 | 2004-04-02 | Hitachi Ltd | Device and method for processing positional coordinate correction |
| KR20040107716A (en) * | 2003-06-12 | 2004-12-23 | 주식회사 케이티 | Geographic information system application method capable of using composite projection and system thereof, and recording medium storing program including the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1435790A (en) * | 2002-01-30 | 2003-08-13 | 上海众恒信息产业有限公司 | Geographic information system on-line analysis data model and attribute data relating method |
| JP2004101780A (en) * | 2002-09-09 | 2004-04-02 | Hitachi Ltd | Device and method for processing positional coordinate correction |
| KR20040107716A (en) * | 2003-06-12 | 2004-12-23 | 주식회사 케이티 | Geographic information system application method capable of using composite projection and system thereof, and recording medium storing program including the same |
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