CN103226604A - SVG-based Web GIS system and relevant energy consumption monitoring system - Google Patents
SVG-based Web GIS system and relevant energy consumption monitoring system Download PDFInfo
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Abstract
The invention provides an SVG (Scalable Vector Graphics) based Web GIS (Web Geographic Information System) system. The system comprises a server and a client, wherein the server further comprises a data persistent layer, an application logic layer and a Web service interface, and the client comprises a browser; the data persistent layer is used for storing space geometrical geographic data, the application logic layer is used for transferring the Shape file format space geometrical geographic data stored in the data persistent layer into the SVG format, and finally forms an SVG map; and the client interacts with the server through the Web service interface, the client sends a request to the server through the Web service interface, and the server sends an SVG map to the client through the Web service interface. The system provided by the invention has the advantages that the system utilizes the advantages such as accuracy, high scalability and small data amount of the SVG, transfers the long-term accumulated geographical information in the traditional GIS system, and enables the information to be displayed in the network terminal for people to develop and use.
Description
Technical field
The present invention relates to internet Geographic Information System applied technical field, particularly a kind of WebGIS system and corresponding energy consumption monitoring system based on SVG.
Background technology
Along with the development of Internet technology, internet Geographic Information System (webGIS) becomes the focus of current Geographic Information System (GIS, Geographic Information System).One of main developing direction of WWW Geographic Information System is multivariate data visit, and it requires in distributed network, and it is open that spatial data can reach, and can visit any data in the distributed network by Interchange Format.Present WebGIS both domestic and external adopts two kinds of map generation techniques, i.e. grid graph technology and vector graphics arts substantially.
Wherein, the shortcoming of grid graph technology is text data can't be separated with how much forms of expression, and the transmitted data on network amount is big, and interactivity is poor, and generating grid graph needs server end to carry out a large amount of calculating, is unfavorable for the development that the GIS diversification is multi-platform and popularizes.
Than the grid graph technology, the advantage that vector graphics arts has is: the scalable vector graphics (SVG that adopts in the vector graphics arts, Scalable Vector Graphic) being the two-dimension vector graphics form of an opening, is the application of extending mark language XML; SVG has any scalability, document size is little, easily generate, modifiability, strong interactivity, text independence, hyperlink, neutrality, characteristics such as platform-neutral, therefore in webGIS, geographical spatial data is encoded into the SVG form carries out the space technology storage, transmission and performance, can eliminate the problem in the data dissemination that is produced at existing proprietary Data Format effectively, in addition, graphic element among the SVG has animated function, can produce cartoon map in view of the above, make client user's map in front have more expressive force, therefore SVG is used for WebGIS, has very important significance.
At present, in generalized information system, three kinds of data management modes are arranged usually, that is: flat file system formula, hybrid, clear data storehouse formula.Wherein, the flat file system uses the file that gets up according to certain structure organization to store data, and file is spatial data files and attribute data file, and the management of the data operation of file (promptly to) is undertaken by own coding.Two kinds of forms of hybrid employing file and relational database, relational database is used for storing the attribute data of regular length, as text etc., because the data volume of spatial data and some attribute data is excessive, the length variations wide ranges, be not easy to traditional relational and store,, manage by coding so still adopt file to store.Perhaps for spatial data, can resolve into elongated spatial data the spatial data of fixed field, store with database again, have incidence relation but such spatial database has a lot of tables, and association is the very big operation of expense in the database, and is very high to server requirement.The full database formula is stored total data with the relational database after improving, database after this improvement also has higher efficient when storage and visit variable-length field, and the management to data does not need user oneself to become realization, but for the diverse data storage of data length constantly new field store, therefore for the unfixed data storage of length, database is not the selection of a wisdom.So usually attribute data is stored in the relational database, by the advantages such as tissue, inquiry, optimization and concurrent control of data base management system (DBMS) management attribute data very easily, and spatial data uses document form storage, hybrid-type storage means that Here it is.
Existing Web GIS has following problem:
First: the data store organisation of existing WebGIS does not adopt standardized storage rule, make its storage and read not have versatility, and data does not have extendability.
Second: geographical spatial data is only carried out metadata cache storage data one time, exist instant data to generate phenomenon, the pressure of server and database can be very big like this, and the user serves and just occurs white space when using map easily;
The 3rd: there is certain closure in existing geographical spatial data.
Summary of the invention
The object of the present invention is to provide a kind of WebGIS system, with the performance of the WebGIS system that improves SVG based on SVG.
Another object of the present invention is to provide a kind of energy consumption monitoring system of the WebGIS system based on SVG, to realize patterned monitoring management to energy consumption.
To achieve these goals, the invention discloses a kind of WebGIS system, comprise the client and server end based on SVG, wherein:
Described server end comprises lasting data layer, applied logic layer and Web service interface; Carry out mutual between described lasting data layer and the described applied logic layer;
Described lasting data layer comprises ESRI Shape spatial data files system, attribute database and PEMLW file system; Described applied logic layer comprises Shape file converteractivemil builder activemil builder, SVG assembler and metadata cache manager; Wherein:
How much geodatas of described ESRI Shape spatial data files system memory space;
The attribute data of the pel of how much geodatas of described attribute database storage space;
The pattern that described PWMLW file system storage space geodata presents, figure layer, structural information;
Described Shape file converteractivemil builder activemil builder is converted to the SVG form with the form of the geometry geodata in the described ESRI Shape spatial data files system from the Shape file layout;
The pattern that the spatial geography data that described SVG assembler is stored according to described PWMLW file system presents, figure layer, structural information, to assemble through the attribute data of the pel of the space geometry geodata of the geometry geodata of the SVG form after the conversion of described Shape file converteractivemil builder activemil builder and described attribute data library storage, be merged into complete SVG element, and the SVG element that each is complete assembles once more, until forming a complete SVG map;
Undertaken alternately by described Web service interface between described client and the described server end, described client sends request by described Web service interface to described server end, and described server end sends the SVG map by described Web service interface to described client;
Described metadata cache manager carries out buffer memory to the data that described client-requested is crossed, and when same resource was accessed again, directly reading of data returned to described client rapidly from described metadata cache manager.
Preferably, described lasting data layer also comprises pre-span database, and the geometry geodata in the described ESRI Shape spatial data files system is stored in after the Shape file layout is converted to the SVG form the described pre-span database.
Preferably, the pattern that the spatial geography data that described SVG assembler is stored according to described PWMLW file system presents, figure layer, structural information, the attribute data of pel that is stored in the space geometry geodata of the geometry geodata of the SVG form in the described pre-span database and described attribute data library storage is assembled, be merged into complete SVG element, and the SVG element that each is complete assembles once more, until forming a complete SVG map.
Preferably, described SVG assembler will be stored in the attribute data of pel of the space geometry geodata of the geometry geodata of the SVG form in the described pre-span database and described attribute data library storage and assemble, be merged into complete SVG element, and the SVG element that each is complete is assembled once more, until forming a complete SVG map, specifically comprise:
1) pattern that presents according to the spatial geography data of described PWMLW file system storage of described SVG assembler, figure layer, structural information are assembled the attribute data of the pel of the space geometry geodata of the geometry geodata of the SVG form in the described pre-span database and described attribute data library storage, form a plurality of atural object entity objects;
2) described SVG assembler is assembled some described atural object entity objects according to pattern, figure layer, structural information that the spatial geography data of described PWMLW file system storage presents, forms a plurality of figure layer object;
3) described SVG assembler is assembled some described figure layer objects according to pattern, figure layer, structural information that the spatial geography data of described PWMLW file system storage presents, forms a plurality of map objects;
4) circulation 1) to 3), until forming the SVG map.
Preferably, described applied logic layer also comprises the map data update device, is used for upgrading the data of described ESRI Shape spatial data files system.
Preferably, described client comprises browser, and the SVG map that described server end sends to described client by described Web service interface is by described browser display.
Preferably, described client also comprises SVG figure reader, described SVG figure reader is installed on the described browser as a plug-in unit, and when described browser was not supported the SVG form, described SVG figure reader was the browser of not supporting the SVG form function that provides support.
Preferably, described client also comprises the JavaScript resolver, described JavaScript resolver is directly carried out on described browser and described SVG figure reader, described JavaScript resolver is resolved the SVG map that described server sends, and the map after will resolving is filled in the SVG figure reader; It realizes that by described JavaScript resolver translation, rolling convergent-divergent, attribute information inquiry, figure layer to the SVG map show control.
Preferably, described client is carried out asynchronous communication by described JavaScript resolver and described server end.
To achieve these goals, the invention also discloses a kind of map inquiry method of above-mentioned WebGIS system based on SVG, it is characterized in that, may further comprise the steps:
Described client sends request to described server end by described Web service interface;
After described metadata cache manager is received request, according to figure layer, coordinate range, zoom level parameter, elder generation's retrieving map data from the metadata cache manager, if find coupling then directly these data are returned to described client, otherwise just from described lasting data layer, retrieve, and the geometry geodata that will retrieve is given described Shape file converteractivemil builder activemil builder;
Described Shape file converteractivemil builder activemil builder sends to described SVG assembler with the form of described how much geodatas after the Shape file layout is converted to the SVG form;
The pattern that the spatial geography data that described SVG assembler is stored according to described PWMLW file system presents, figure layer, structural information, the assembling that will circulate through the attribute data of the pel of the space geometry geodata of the geometry geodata of the SVG form after the conversion of described Shape file converteractivemil builder activemil builder and described attribute data library storage is until finishing required SVG map document;
Described SVG assembler carries out the SVG map document that assembles to return to described client after the GZIP compression, sends to described metadata cache manager simultaneously and carries out buffer memory.
To achieve these goals, the invention also discloses a kind of energy consumption monitoring system of the WebGIS system based on SVG, utilize above-mentioned WebGIS system to carry out energy consumption monitoring, should the space geometry geodata of SVG map correspondence be divided into area level based on the energy consumption monitoring system of the WebGIS system of SVG, the greening layer, the rivers and lakes layer, path layer, the buildings layer, the bridge layer, bus station's layer, the street lamp layer, the monitoring camera-shooting layer, water energy mechanical floor, water energy pipeline layer, water energy transport layer, the electric energy mechanical floor, electric energy cable layer, the electric energy Communication Layer, the gas-fired equipment layer, the burning line layer, its SVG map also correspondingly is divided into the areal map layer, greening figure layer, rivers and lakes figure layer, the mileage chart layer, buildings figure layer, bridge figure layer, the figure of bus station layer, street lamp figure layer, monitoring camera-shooting figure layer, water energy equipment drawing layer, water energy conduit line map layer, water energy transmission diagram layer, electric energy equipment drawing layer, electric energy cable figure layer, electric energy communication figure layer, gas-fired equipment figure layer, Gas Pipe line chart layer; When using this, only need to switch the figure layer that needs to pay close attention to and to check corresponding information in this figure layer in client based on the energy consumption monitoring system of the WebGIS system of SVG.
Compared with prior art, beneficial effect of the present invention is as follows:
1, standardization.Employing is based on the data structure of the W3C standard appearance form as map, figure is attractive in appearance, file standard is unified, readability by force, easy-to-use flexibly.
2, high-performance.Because geographical spatial data has been carried out the multiple cache processing and has generated in advance handling, there is not the phenomenon of instant data generation substantially, the pressure of server and database reduces greatly, white space can not occur when the user uses map, experiences very good.
3, portability.Data volume and programmed control size of code are few, on the perfect basis of assurance function, carry out the efficient height, and it is few to take resource.
4, promptness.SVG geometric data and attribute data are relative separation, can not have influence on relevant adeditive attribute information when upgrading the map graph data, so the renewal of map datum operation is simple relatively a lot.
5, high scalability.With the content of traditional GIS simply with thousand as same dull interface compare, native system can provide the data message of abundant dynamic and customization of individual character, and SVG has characteristics such as any scalability, modifiability, strong interactivity, text independence, hyperlink, neutrality, platform-neutral, we provide the expansion on a lot of functions, and the user can be very easily integrates oneself application and native system.
6, opening.The present invention uses Web Service to handle geographical spatial data, and a spatial Information Service platform opening, interoperable, dynamic link is provided.Simultaneously, Web Service is based on XML document and carries out service describing, services request and feedback result, with same based on the SVG of XML can be seamless integrated.
7, user friendly.The present invention has increased a layer at browser end--Ajax(Asynchronous JavaScript and XML), the request that the user triggers just gives this engine to handle, it is responsible for sending request to server, server is passed back is business datum but not html page, after engine receives, play up, present on the page by browser resolves, use the Ajax technology to carry out the part in the WebGIS map and refresh the user friendly that can improve system greatly, the user does not know that even browser just is being server communication.
Description of drawings
Fig. 1 is the structural representation of the specific embodiment of the invention based on the WebGIS of SVG;
Fig. 2 is the structural representation of specific embodiment of the invention geographical spatial data;
Fig. 3 is the work synoptic diagram of specific embodiment of the invention querying method;
Fig. 4 is the synoptic diagram of multi-level buffer provided by the invention.
Embodiment:
The present invention will be further described with specific embodiment in conjunction with the accompanying drawings in the below.
Embodiment
As Fig. 1, a kind of WebGIS system based on SVG and spatial database comprises client 1 and server end 2; Server end 2 comprises lasting data layer 4, applied logic layer 3 and Web service interface 12; Carry out data interaction between lasting data layer 4 and the applied logic layer 3, client 1 is carried out data interaction with server end 2 by Web service interface 12.
As Fig. 1, lasting data layer 4 comprises ESRI Shape spatial data files system 16, attribute database 10 and PEMLW file system 9, wherein: how much geodatas of ESRI Shape spatial data files system 16 storage spaces; The attribute data of the pel of how much geodatas of attribute database 10 storage spaces; The pattern that PEMLW file system 9 storage space geodatas present, figure layer, structural information.Wherein, attribute database 10 adopts SQL Serve databases, and it can further comprise SQL Serve database caches unit, to play the effect of the response speed of accelerating database.
As Fig. 1, described applied logic layer 3 comprises metadata cache manager 5, Shape file converteractivemil builder activemil builder 8 and SVG assembler 6; Wherein: Shape file converteractivemil builder activemil builder 8 is responsible for the form of the geometry geodata in the ESRI Shape spatial data files system 16 is converted to the SVG form from the Shape file layout; The pattern that the spatial geography data that SVG assembler 6 is stored according to described PWMLW file system 9 presents, figure layer, structural information, the attribute data of the pel of the space geometry geodata that will store through geometry geodata and the described attribute database 10 of the SVG form after 8 conversions of described Shape file converteractivemil builder activemil builder is assembled, be merged into complete SVG element, and the SVG element that each is complete assembles once more, until forming a complete SVG map;
Described client 1 sends request by described Web service interface 12 to described server end 2, and described server end 2 sends the SVG map by described Web service interface 12 to described client 1;
The data that 5 pairs of described clients 1 of described metadata cache manager were asked are carried out buffer memory, and when same resource was accessed again, directly reading of data returned to described client 1 rapidly from described metadata cache manager 5.
And in order further to improve the responding ability of server end, the present invention has adopted three grades of cache technologies, improves the responding ability of server to greatest extent.Three grades of high-speed caches lay respectively at the spatial data buffer memory of lasting data layer 4, the SVG cache map and the client-cache of applied logic layer 3, preceding two kinds of buffer memorys all are based on a hashmap that storage key/value is right, data are that the matching method with key/value exists, just as a very big Hash table, see Fig. 4.
The attribute database 10 main SQLSERVER of the application database caches of lasting data layer rely on, the performance bottleneck major part of GIS server is in Query Database, so at very important of the buffer memory of database, the present invention has realized the buffer memory of SQL Server database by a series of configurations, when tables of data is not upgraded, just from buffer memory, read ability reading of data from database when Data Update.Such as the essential information of the buildings of often inquiring about in GIS, we get up building information tables of data buffer memory, when the request road of building information comes, just do not need to have read from database again, have accelerated the response speed of system.
The spatial geography data of data base persistence layer and applied logic layer have adopted distributed memory target cache technology.Wherein, the applied logic layer also comprises a load balancing management device, load balance is as the term suggests be exactly the load balance of being responsible for processing server, it is analyzed the request that receives, then request is sent to the less server of load pressure and handle, thus the response speed of raising server.What is called is distributed can set up a bigger caching server by multiple servers in other words, reduces the number of times of reading database by data cached in internal memory and object, thereby improves the response speed of weblication.Such as the data in client-requested figure layer L, zoom level A, the coordinate range C, the metadata cache manager can check earlier in the distributed memory target cache system whether buffer memory is arranged, and just directly takes out data if having from buffer memory; If do not have, just take out from database that data return to the load balancing management device and with the metadata cache of request in distributed memory target cache system, ask identical data just can directly from internal memory, read so next time and need not remove Query Database again, in case data are had renewal, the buffer memory in new database and the internal memory has more simultaneously guaranteed the accuracy and the synchronism of data.By a large amount of tests and practice, the cache technology of applied logic layer can be brought up to the concurrent access number of separate unit server about 1000 from 20, has just improved 50 times, and this is a considerable performance boost.
Client-cache mainly is to realize by the buffer memory of browser and SVG figure reader itself.
In order to improve the processing speed of system, lasting data layer 4 also comprises pre-span database 11, the geometry geodata that pre-span database 11 is stored in the ESRI Shape spatial data files systems 16 is changed through the Shape file converteractivemil builder activemil builder, and the pel document of the SVG form that obtains after the process arrangement; This pre-span database 11 also comprises the space geometry data buffer storage unit, and it can accelerate the space geometry processing speed of data.By the Shape file converteractivemil builder activemil builder, space geometry data cell in the ESRI Shape file system and corresponding attribute data carried out assembly unit and be converted into the element fragment of SVG form, be stored in after treatment in the pre-span database and manage concentratedly, when request of data, directly visit pre-span database.
Wherein, the assembling mode of SVG assembler 6 is: the pattern that SVG assembler 6 presents according to the spatial geography data of storing in the PWMLW file system 9, figure layer, structural information, the attribute data that is stored in the pel of the space geometry geodata of storage in the geometry geodata of the SVG form in the pre-span database 11 and the attribute database 10 is assembled, be merged into complete SVG element, and the SVG element that each is complete assembles once more, until forming a complete SVG map.Specifically comprise following process:
1) SVG assembler 6 is assembled the attribute data of the pel of the space geometry geodata of storing in geometry geodata of the SVG form in the pre-span database 11 and the attribute database 10 according to the pattern that presents of spatial geography data of storage in the PWMLW file system 9, figure layer, structural information, forms a plurality of atural object entity objects;
2) SVG assembler 6 is assembled some described atural object entity objects according to the pattern that presents of spatial geography data, figure layer, the structural information of storage in the PWMLW file system 9, forms a plurality of figure layer object;
3) SVG assembler 6 is assembled some described figure layer objects according to the pattern that presents of spatial geography data, figure layer, the structural information of storage in the PWMLW file system 9, forms a plurality of map objects;
4) circulation 1) to 3), until forming the SVG map.
In certain embodiments, applied logic layer 3 also comprises map data update device 7, is responsible for upgrading the Shape file data in the ESRI Shape spatial data files system 16.
As Fig. 1, described client 1 comprises: browser 13, server end 2 show by browser 13 to the SVG map that described client 1 sends that by described Web service interface 12 therefore described browser 13 is visit instruments based on the WebGIS of SVG.
For the compatibility of enhanced system, in preferred embodiment, described client 1 also comprises SVG figure reader 15, and it is a plug-in unit that is installed on the browser, and SVG figure reader 15 is not supported the browser of the SVG document format function that provides support for some.
And, in preferred embodiment, described client 1 also comprises Javascript resolver 14, it is used for realizing that translation, rolling convergent-divergent, attribute information inquiry, the figure layer of SVG WebGIS show control, the SVG document that sends with server asynchronous communication, resolution server end and the operation that is filled into SVG figure reader, described JavaScript resolver 14 can also be used to define other application programming interfaces mutual with the SVG map, call for other map application developer, and then develop the abundanter SVG map application of function.Described client 1 also comprises the client-cache unit, and the response processing speed of client is accelerated in described client-cache unit.
Below the present invention is formed the SVG map principle be specifically described:
Geographical spatial data is used for describing the geographical space phenomenon, generally be divided into space geometry data and attribute data, because space geometry data more complicated, and SVG only supports the graphic element that some are basic at present, (contact that so-called spatial entities model is each spatial entities object all is directly to be stored in entity object inside so the space geometry data are organized by the spatial entities model, independently), be embodied as: the atural object in the real world is divided into simple atural object and complicated atural object two big classes, simple atural object is divided into point-like again and realizes, the wire map, area feature, complicated atural object are to have a plurality of simple maps to constitute.In addition, each atural object entity is made up of target identifying code, the collective data of describing this atural object and attribute data.(as Arc) is different with general generalized information system, and a figure layer can comprise dissimilar geographical entities in based on the WebGIS of SVG, and several figure layers can be formed a map.
As shown in Figure 2, a map object can be divided into several figure layer objects, and some figure layer objects comprise several atural object objects, the packet label that all map objects all adopt SVG and provided
gRepresent, use
gThe ID attribute of label comes the indicated object numbering, as: the agreement map object is with " M " beginning of letter; Figure layer object is with " L " beginning of letter; Entity object indicates with " R ", at point-like atural object, linear ground object, area feature, complicated atural object respectively with " RP ", " RL ", " RA ", " RC " beginning.The graphic element that SVG provides can directly be described these atural object: point-like atural object symol element definition, use then
UseElement is quoted, linear ground object circle, rect, polyline, element representations such as path, area feature circle, rect, polyline, element representations such as path.
WebGIS map datum storage means based on SVG: each atural object entity is made up of target identifying code, the collective data of describing this subway and attribute data, a figure layer can comprise dissimilar geographical entities in based on the WebGIS of SVG, and several figure layers can be formed a map, spatial geography data is stored in the ESRI Shape spatial data files system with the Shape document form, attribute data is stored in the attribute database 10, and attribute database 10 is a relational database; Described Shape file uses the positional information and the attribute information of simple non-topological form storage geographic object, the Shape file is the vector format map file, its coordinate is a Cartesian coordinates, in the Shape map file, the geometric configuration of each geographic element is stored with one group of phasor coordinate form in the figure layer, corresponding attribute information leaves in the tables of data of the attribute database (dBase) that links to each other with the Shape file, and carries out association by unique sign; The geographic element of a certain type of each Shape file storage, each key element is equivalent to the line item in the tables of data, ESRI Shape file layout leaves positional information and attribute information respectively in the specific file of one group of extended file name, these document storages are in same catalogue, this group file comprises a master file, a dBase form document and an index file
Master file is an extension name with .shp, is the file that the record length of a direct access differs, the wherein geological information of an object of each bar recording storage;
Index file is an extension name with .shx, in the indexed file, and one of correspondence its off-set value of record in each bar recorded and stored master file with respect to the master file reference position;
The dBase form document is extension name with .dbf, it comprises the attribute information of object, article one, write down corresponding object, the contact of attribute and object is based on recording mechanism (record number), and attribute record is recorded in sequence consensus in the master file in the storage order of dbase form document and its corresponding geographical location information.
During the storage of described attribute data in database the opening relationships table, each pel all has a corresponding data attribute link, the attribute of such all examples of pel of storage in table.
When WebGIS uses the Shape data, the Shape file is converted to the document of SVG form by instrument, be stored in pre-span database after the arrangement, by the SVG assembler itself and corresponding attribute data assembled again, until finishing required SVG map document.
As Fig. 3, based on the map inquiry method of the WebGIS system of SVG, it comprises the steps:
S1: client sends request to described server end by described Web service interface;
S2: after the metadata cache manager is received request, according to figure layer, coordinate range, zoom level parameter, elder generation's retrieving map data from the metadata cache manager, if find coupling then directly these data are returned to described client, otherwise just from described lasting data layer, retrieve, and the geometry geodata that will retrieve is given described Shape file converteractivemil builder activemil builder;
The S3:Shape file converteractivemil builder activemil builder sends to described SVG assembler with the form of described how much geodatas after the Shape file layout is converted to the SVG form;
The pattern that the spatial geography data that the S4:SVG assembler is stored according to described PWMLW file system presents, figure layer, structural information, the assembling that will circulate through the attribute data of the pel of the space geometry geodata of the geometry geodata of the SVG form after the conversion of described Shape file converteractivemil builder activemil builder and described attribute data library storage is until finishing required SVG map document;
The S5:SVG assembler carries out the SVG map document that assembles to return to described client after the GZIP compression, sends to described metadata cache manager simultaneously and carries out buffer memory.
Wherein, the coordinate system of definition oneself in SVG, be in SVG, to define coordinate transform (transform), its implication is similar to coordinate transform and the mapping ruler in the cartesian geometry, can carry out translation, convergent-divergent, rotation, mistake to one or set of diagrams shape object cuts, concrete conversion regime is as follows: and translate (x, y): graphic element is by specifying numerical value to be offset in X, Y direction respectively; Scale (x, y): graphic element by specifying numerical value to carry out convergent-divergent in X, Y direction respectively, if only specify a value, it will be used for both direction; Rotate (n): graphic element is rotated by the angle of appointment.
In browser, the drawing area of SVG file is at a definite rectangle viewport,＜svg〉be marked with " width " and " height " attribute, the viewport size when they are used for mark SVG graph rendering; During visit SVG document, client is the initialization viewport at first, sets up the viewport coordinate system, and its acquiescence far point is in the upper left corner of viewport, X-axis positive dirction level to the right, the Y-axis positive dirction is straight down.
By the root element attribute viewbox of control SVG document, change the upper left corner coordinate and the lower right corner coordinate of viewing window, realize that the convergent-divergent of figure shows; The viewbox attribute of SVG label allows level or vertical moving and convergent-divergent original figure, and this attribute comprises 4 numerals and specifies upper left corner coordinate and lower right corner coordinate, and these coordinates can be through the new form coordinate after the Pan and Zoom transformation calculations.
In based on the WebGIS system of SVG, can also carry out the inquiry of atural object attribute data, be specially: attribute data and geometry data separate storage, only store the descriptive geometry data of atural object in the SVG document, and attribute data leaves in the attribute database of server end, both connect by " atural object identification number ", increase a mouse-click incident for each the atural object object in the SVG map by the JavaScript program by way of bailment, when the user clicks an atural object, JavaScript can get access to current atural object " atural object identification number ", by the asynchronous communication technology " atural object identification number " sent to server then and inquire about, the server return data shows with the form that ejects the layer that floats later on again.
And can also carry out the control of map layer, be specially: at first the getElementById method by JavaScript finds the g packet label, and visual (Visibility) property value that this element is set then can be realized closing and show control to figure layer for hiding (hidden) or visible (visible); Wherein, getElementById is the grammer among the JavaScript, and its implication is to obtain element by the ID characteristic of element.
The present invention is on the basis based on the WebGIS system of SVG, a kind of WebGIS system energy consumption supervisory system based on SVG also is provided, should the space geometry geodata of SVG map correspondence be divided into area level based on the energy consumption monitoring system of the WebGIS system of SVG, the greening layer, the rivers and lakes layer, path layer, the buildings layer, the bridge layer, bus station's layer, the street lamp layer, the monitoring camera-shooting layer, water energy mechanical floor, water energy pipeline layer, water energy transport layer, the electric energy mechanical floor, electric energy cable layer, the electric energy Communication Layer, the gas-fired equipment layer, the burning line layer, its SVG map also correspondingly is divided into the areal map layer, greening figure layer, rivers and lakes figure layer, the mileage chart layer, buildings figure layer, bridge figure layer, the figure of bus station layer, street lamp figure layer, monitoring camera-shooting figure layer, water energy equipment drawing layer, water energy conduit line map layer, water energy transmission diagram layer, electric energy equipment drawing layer, electric energy cable figure layer, electric energy communication figure layer, gas-fired equipment figure layer, Gas Pipe line chart layer; When using this, only need to switch the figure layer that needs to pay close attention to and to check corresponding information in this figure layer in client based on the energy consumption monitoring system of the WebGIS system of SVG.
Below with two operation cases explanations down based on
SVGThe application of WebGIS in energy consumption monitoring administrative analysis platform:
1. the user switches " water energy mechanical floor ", can will come out in the map with energy device (water meter, collector, signal repeater, the signal concentrator) icon display that water closes, the user finds the water energy equipment that oneself will pay close attention to by convergent-divergent, translation, also can navigate to the water energy equipment that will pay close attention to by comprehensive inquiry, clickable icon can display essential information, the water consumption bar chart of this equipment;
2. the user switches " the monitoring camera-shooting layer ", the icon display of watch-dog can be come out in the map, the user finds the watch-dog that oneself will pay close attention to by convergent-divergent, translation, also can navigate to the watch-dog that to pay close attention to by comprehensive inquiry, clickable icon can will eject a window, and what the inside showed is the video pictures of this watch-dog.
More than be two operation cases, the user can also use this energy consumption monitoring system based on the WebGIS system of SVG that other figure layer information is checked.
The present invention uses by integrated WebGIS based on SVG in energy consumption monitoring administrative analysis platform, realize patterned monitoring management, can provide intuitively, concisely, data message inquiry efficiently and decision support service, simultaneously incoherent functional module in the system is integrated together, the user only need switch to the figure layer that needs to pay close attention on map interface can obtain corresponding information, improves user's the efficiency of management.
The preferred embodiment of the present invention just is used for helping to set forth the present invention.Preferred embodiment does not have all details of detailed descriptionthe, does not limit this invention yet and only is described embodiment.Obviously, according to the content of this instructions, can make many modifications and variations.These embodiment are chosen and specifically described to this instructions, is in order to explain principle of the present invention and practical application better, thereby the technical field technician can utilize the present invention well under making.The present invention only is subjected to the restriction of claims and four corner and equivalent.
Claims (11)
1. the WebGIS system based on SVG is characterized in that, comprises the client and server end, wherein:
Described server end comprises lasting data layer, applied logic layer and Web service interface; Carry out mutual between described lasting data layer and the described applied logic layer;
Described lasting data layer comprises ESRI Shape spatial data files system, attribute database and PEMLW file system; Described applied logic layer comprises Shape file converteractivemil builder activemil builder, SVG assembler and metadata cache manager; Wherein:
How much geodatas of described ESRI Shape spatial data files system memory space;
The attribute data of the pel of how much geodatas of described attribute database storage space;
The pattern that described PWMLW file system storage space geodata presents, figure layer, structural information;
Described Shape file converteractivemil builder activemil builder is converted to the SVG form with the form of the geometry geodata in the described ESRI Shape spatial data files system from the Shape file layout;
The pattern that the spatial geography data that described SVG assembler is stored according to described PWMLW file system presents, figure layer, structural information, to assemble through the attribute data of the pel of the space geometry geodata of the geometry geodata of the SVG form after the conversion of described Shape file converteractivemil builder activemil builder and described attribute data library storage, be merged into complete SVG element, and the SVG element that each is complete assembles once more, until forming a complete SVG map;
Undertaken alternately by described Web service interface between described client and the described server end, described client sends request by described Web service interface to described server end, and described server end sends the SVG map by described Web service interface to described client;
Described metadata cache manager carries out buffer memory to the data that described client-requested is crossed, and when same resource was accessed again, directly reading of data returned to described client rapidly from described metadata cache manager.
2. the WebGIS system based on SVG according to claim 1, it is characterized in that, described lasting data layer also comprises pre-span database, and the geometry geodata in the described ESRI Shape spatial data files system is stored in after the Shape file layout is converted to the SVG form the described pre-span database.
3. the WebGIS system based on SVG according to claim 2, it is characterized in that, the pattern that the spatial geography data that described SVG assembler is stored according to described PWMLW file system presents, figure layer, structural information, the attribute data of pel that is stored in the space geometry geodata of the geometry geodata of the SVG form in the described pre-span database and described attribute data library storage is assembled, be merged into complete SVG element, and the SVG element that each is complete assembles once more, until forming a complete SVG map.
4. the WebGIS system based on SVG according to claim 3, it is characterized in that, described SVG assembler will be stored in the attribute data of pel of the space geometry geodata of the geometry geodata of the SVG form in the described pre-span database and described attribute data library storage and assemble, be merged into complete SVG element, and the SVG element that each is complete is assembled once more, until forming a complete SVG map, specifically comprise:
1) pattern that presents according to the spatial geography data of described PWMLW file system storage of described SVG assembler, figure layer, structural information are assembled the attribute data of the pel of the space geometry geodata of the geometry geodata of the SVG form in the described pre-span database and described attribute data library storage, form a plurality of atural object entity objects;
2) described SVG assembler is assembled some described atural object entity objects according to pattern, figure layer, structural information that the spatial geography data of described PWMLW file system storage presents, forms a plurality of figure layer object;
3) described SVG assembler is assembled some described figure layer objects according to pattern, figure layer, structural information that the spatial geography data of described PWMLW file system storage presents, forms a plurality of map objects;
4) circulation 1) to 3), until forming the SVG map.
5. the WebGIS system based on SVG according to claim 4 is characterized in that described applied logic layer also comprises the map data update device, is used for upgrading the data of described ESRI Shape spatial data files system.
6. the WebGIS system based on SVG according to claim 1 is characterized in that described client comprises browser, and the SVG map that described server end sends to described client by described Web service interface is by described browser display.
7. the WebGIS system based on SVG according to claim 6, it is characterized in that, described client also comprises SVG figure reader, described SVG figure reader is installed on the described browser as a plug-in unit, when described browser was not supported the SVG form, described SVG figure reader was the browser of not supporting the SVG form function that provides support.
8. the WebGIS system based on SVG according to claim 7, it is characterized in that, described client also comprises the JavaScript resolver, described JavaScript resolver is directly carried out on described browser and described SVG figure reader, described JavaScript resolver is resolved the SVG map that described server sends, and the map after will resolving is filled in the SVG figure reader; It realizes that by described JavaScript resolver translation, rolling convergent-divergent, attribute information inquiry, figure layer to the SVG map show control.
9. the WebGIS system based on SVG according to claim 8 is characterized in that described client is carried out asynchronous communication by described JavaScript resolver and described server end.
10. the map inquiry method of the WebGIS system based on SVG as claimed in claim 1 is characterized in that, may further comprise the steps:
Described client sends request to described server end by described Web service interface;
After described metadata cache manager is received request, according to figure layer, coordinate range, zoom level parameter, elder generation's retrieving map data from the metadata cache manager, if find coupling then directly these data are returned to described client, otherwise just from described lasting data layer, retrieve, and the geometry geodata that will retrieve is given described Shape file converteractivemil builder activemil builder;
Described Shape file converteractivemil builder activemil builder sends to described SVG assembler with the form of described how much geodatas after the Shape file layout is converted to the SVG form;
The pattern that the spatial geography data that described SVG assembler is stored according to described PWMLW file system presents, figure layer, structural information, the assembling that will circulate through the attribute data of the pel of the space geometry geodata of the geometry geodata of the SVG form after the conversion of described Shape file converteractivemil builder activemil builder and described attribute data library storage is until finishing required SVG map document;
Described SVG assembler carries out the SVG map document that assembles to return to described client after the GZIP compression, sends to described metadata cache manager simultaneously and carries out buffer memory.
11. energy consumption monitoring system based on the WebGIS system of SVG, utilize WebGIS as claimed in claim 1 system to carry out energy consumption monitoring, it is characterized in that, should the space geometry geodata of SVG map correspondence be divided into area level based on the energy consumption monitoring system of the WebGIS system of SVG, the greening layer, the rivers and lakes layer, path layer, the buildings layer, the bridge layer, bus station's layer, the street lamp layer, the monitoring camera-shooting layer, water energy mechanical floor, water energy pipeline layer, water energy transport layer, the electric energy mechanical floor, electric energy cable layer, the electric energy Communication Layer, the gas-fired equipment layer, the burning line layer, its SVG map also correspondingly is divided into the areal map layer, greening figure layer, rivers and lakes figure layer, the mileage chart layer, buildings figure layer, bridge figure layer, the figure of bus station layer, street lamp figure layer, monitoring camera-shooting figure layer, water energy equipment drawing layer, water energy conduit line map layer, water energy transmission diagram layer, electric energy equipment drawing layer, electric energy cable figure layer, electric energy communication figure layer, gas-fired equipment figure layer, Gas Pipe line chart layer; When using this, only need to switch the figure layer that needs to pay close attention to and to check corresponding information in this figure layer in client based on the energy consumption monitoring system of the WebGIS system of SVG.
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