CN101826185B - WebGIS based irrigation area space data sharing method and realization system thereof - Google Patents
WebGIS based irrigation area space data sharing method and realization system thereof Download PDFInfo
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Abstract
The invention discloses a WebGIS irrigation area management method of shared data, which comprises the following steps of: obtaining the geographic information data of the corresponding irrigation areas by a plurality of data sources according to the requirement of a user; constructing a GML spatial database based on the obtained geographic information data according to a preset GML spatial data sharing model; customizing an access interface for a WebGIS server according to the GML spatial data sharing model and receiving data in the GML spatial database by the interface; analyzing and processing the received data and generating the geographic information contents of the corresponding irrigation areas according to the setting of the user; and transmitting the geographic information contents of the irrigation areas to a client browser by the access interface and displaying according to the operation of a client. The invention also discloses a system for realizing the method. By the invention, the spatial data of the irrigation areas can realize cross-platform sharing by a unified interface, and a technical basis is provided for the large-scale popularization of WebGIS in the field of the irrigation management of the irrigation areas.
Description
Technical field
The present invention relates to the computer information technology field, particularly a kind of irrigated area Spatial Data Sharing method and realization system thereof based on WebGIS.
Background technology
At present; The level of informatization of Chinese large-sized irrigated areas administration also is in lower level, and the irrigated area information gathering point is few, and observation method is more single; Through telephone wire simulating signal or manual papery media transmission information, can not monitor the various features indication information in waters, irrigated area real-time and accurately.Therefore, the water plan can not be dynamically adjusted in the irrigated area, and the water scheduling is carried out mostly by rule of thumb, can't adapt to situations of change such as regimen, crop-planting structure, also causes the waste of water resource inevitably.
GIS (Geographic Information System, GIS-Geographic Information System) database is the interior data acquisition about certain geographical element characteristic in certain zone, relates generally to management and tissue to figure and attribute data.
WebGIS (Web Geographic Information System, network geographic information system) a kind ofly carries out the issue of geographic information data, the system of sharing and exchanging cooperation based on the Internet platform.Through years of development, it is from theoretical, technology, product or uses and all made significant headway.The development of WebGIS has effectively promoted the socialization of GIS undoubtedly, has also promoted the widespread use of geographical spatial data.Yet, owing to present WebGIS product stand-alone development in different environment, culture background, domain background and the technical background of oneself arranged, formed data model and the functional organization of oneself.Though these products are all similar in function and problem description ability to, difference is very big in practical operation; The inner space data organization is maintained secrecy mutually in addition, has formed the barrier between different WebGIS system.In this case,, the user is difficult to if wanting the data of in a WebGIS system, browsing or integrating in the other system, or even impossible.Because this sealing, independently the WebGIS system is keeping a kind of state of complete closed to the processing of spatial data, causing can't shared data and disposal route between system.On the one hand, aiming at the geographical spatial data that a kind of WebGIS system generated can not be used by another system; On the other hand, the service function of a WebGIS system can not be used by another system.This situation has seriously hindered further developing of WebGIS.
GML geography information shared data model is a kind of general spatial geography data descriptor format.The coding standard that before GML occurs, has just had many geography information, GML and their essential distinction are based on XML's, represent geography information with the form of text, and be fairly simple, directly perceived, is easy to browse, edits, verifies, changes.Can the GML data-switching be become vector data forms such as SVG, VML, VRML, special figure plug-in unit need be installed can be shown on browser.The XML edit tool of most text edit software or specialty can be edited GML, without any need for GIS software.The same with XML, can verify through DTD or XML Schema whether the content and structure of GML is complete correct.The GML model has obtained the support energetically of many GIS software vendor, so data-switching becomes the loss of the information that do not have behind the GML.GML geography information shared data model is realized visit and the use of different system to the GML spatial data through eliminating the difference on the spatial data describing method, reach spatial data in form with sharing in essence.
Summary of the invention
The technical matters that (one) will solve
The technical matters that the present invention will solve is to overcome the defective that existing irrigated area spatial data can not be shared.
(2) technical scheme
For solving the problems of the technologies described above, technical scheme of the present invention provides a kind of irrigated area Spatial Data Sharing method based on WebGIS, comprising:
S1: obtain the geographic information data of corresponding irrigation areas according to user input instruction from a plurality of data sources, wherein, said data source comprises GIS database and internet electronic map web site;
S2:, set up the GML spatial database based on the said geographic information data that obtains according to the GML geographic information data sharing model that presets;
S3: according to said GML geographic information data sharing model is WebGIS server custom access interface, and receives the data in the said GML spatial database through said access interface;
S4: the data of said reception are analyzed and handled, the geographic information contents that generates corresponding irrigation areas is set according to the user;
S5: said irrigated area geographic information contents is sent to client browser through said access interface, operate demonstration according to the client.
Further, said step S2 comprises:
S201: the irrigated area geographical space is divided into a plurality of figure layers according to geographical spatial object;
S202: the said geographic information data that obtains is divided into space element data and spatial data; Wherein, Said space element data comprise figure layer metadata and data set metadata, and said spatial data comprises the geometric data and the attribute data of each geographical space object in the irrigated area;
S203:,, store said space element data and spatial data respectively with layered mode according to the figure layer of said irrigated area geographical space through having the database of GIS spatial data expanded function.
Further, when said data source was the GIS database, said step S2 also comprised between step S202 and 203: with said Conversion of Spatial Data is the GML document format, comprises following substep:
S21: newly-built GML document;
S22: read geographical geometric data and geographical attribute data in the said spatial data respectively;
S23: according to said data configuration document object tree of reading; Wherein, Each root node is corresponding to the title of a geographical space object in the irrigated area, and each child node of said root node comprises the geographical geometric data and the geographical attribute data of said geographical space object;
S24: said document object tree is write said GML document: at first write all root nodes of said document object tree, write all child nodes of each said root node then successively.
Wherein, Said space element data storage is arrived the PostgreSQL database; A table of the corresponding PostgreSQL database of space element data of each figure layer; The corresponding gauge outfit of the Property Name of space element data, the value of data in the property value correspondence table, the incidence relation between each table is corresponding to the spatial relationship between the geographical space object of irrigated area.
Wherein, store said spatial data into the PostGIS spatial database, with said geometric data abstract according to the division of figure layer be point, line, surface; Wherein, said point comprises the end points of isolated point, line and the head and the tail point of face, and the set of the point of each figure layer is stored as a table separately; Said line is divided into starting point, terminal point and segmental arc, and the set of the line of each figure layer is stored as a table according to the topological relation in space, and gauge outfit is starting point, terminal point and segmental arc; Said face is divided into polygon and segmental arc, and the set of the face of each figure layer is stored as a table according to spatial topotaxy, and gauge outfit is polygon and segmental arc; With attribute data is that unit stores with the pixel, the corresponding table of each pixel, the geographic coordinate and the geographical attribute value of this pixel of storage in the table.Wherein, among the said step S3, be the customization of the MapServer map server in WebGIS server space element data-interface, be the customization of the Apache Web server in WebGIS server spatial data interface.
The present invention also provides a kind of realization system for carrying out said process, comprising:
Client browser is used for the geographic information data according to user input instruction demonstration corresponding irrigation areas;
The data source data administration module is used for obtaining the geographic information data of corresponding irrigation areas according to user input instruction from GIS database and/or internet electronic map web site, and sets up the GML spatial database according to said geographic information data;
GML spatial data analysis treatment module is used to receive the data of said GML spatial database and analyzes and handle, and generates the required geographic information contents of client and also sends to client browser;
The WebGIS server is used to realize the data transmission between said client browser, data source data administration module, the GML spatial data analysis treatment module.
Further, said data source data administration module also comprises: the Data Format Transform submodule: with the Conversion of Spatial Data in the GIS database is the GML document format.
Further, said system also comprises: the access interface customized module is the data-interface of said WebGIS server custom based on the GML form.
(3) beneficial effect
The present invention can comprehensive various GIS databases and the geographic information data of online electronic chart; Various irrigated area spatial data resource is described with unified GML form; Make irrigated area geography information and the service can be, for the large-scale promotion in WebGIS irrigation management field in the irrigated area provides technical foundation through unified interface cross-platform sharing.
Description of drawings
Fig. 1 is the process flow diagram according to the irrigated area Spatial Data Sharing method based on WebGIS of the present invention;
Fig. 2 is the structured flowchart according to the realization system of the irrigated area Spatial Data Sharing method based on WebGIS of the present invention.
Embodiment
The WebGIS irrigated areas administration method and system of the shared data that the present invention proposes are explained as follows in conjunction with accompanying drawing and embodiment.Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
As shown in Figure 1, the irrigated area Spatial Data Sharing method based on WebGIS of the present invention may further comprise the steps:
S1: obtain the geographic information data of corresponding irrigation areas from a plurality of geodatas source according to user input instruction, wherein, the geodata source comprises existing traditional GIS database and internet electronic map web site; The form more complicated of Traditional GIS database space data, various GIS products all have the data layout of oneself, use commonplace have Shapefiles and MIF form; For the internet electronic map web site, after grasping and downloading the geographic information data of corresponding irrigation areas, type is classified these geographic information datas according to the map, for example satellite map, general map, get a bird's eye view map or the like;
S2: set up the GML spatial database according to the said geographic information data that obtains; Specifically, design irrigated area geodata Share Model as required, the geodata in irrigated area is divided into space element data and spatial data, use the GML form to describe, with the unification on the information description method of implementation space; Set up GML spatial data memory model then; In addition, for the Traditional GIS database, also must a kind of format conversion algorithm of design, according to the characteristic of spatial data, the Conversion of Spatial Data of different-format in the existing GIS database is become unified GML form.Thus, realize the foundation of GML spatial database.
Specifically, set up irrigated area geodata Share Model and be meant the geodata in the spatial dimension of irrigated area is divided into space element data and spatial data, use the GML form to describe.Wherein the space element data comprise figure layer metadata and data set metadata, are used to describe the spatial relationship characteristic in irrigated area; Spatial data comprises geographical geometric data and attribute data, is used to describe the geographical attribute in irrigated area.Specifically; For the figure layer metadata in the space element data; Each figure layer is a set that has the similar geographical space object of same alike result in the certain space scope of irrigated area, has expressed the distributivity of spatial geography data, and for example a slice rice field in the scope of irrigated area is a figure layer; For the data set metadata, what data set was expressed is the combination of figure layer in the particular space scope of irrigated area, such as the All Ranges of rice cultivation in the irrigated area.For spatial data; What wherein geographical geometric data was expressed is the geometric shape and the position of irrigated area spatial object, presses the geometric type that point, line, surface define entity with approach vector, forms the relation between a line, the line generation face definition entity by point; For example; The monitoring station in irrigated area can be expressed as a little, and irrigation canal can be expressed as line, and a slice plantation irrigated area can be expressed as face; Attribute data is that irrigated area spatial object attributes of entities is described, for example, and the geographic coordinate of monitoring station, irrigated area, water consumption, managerial personnel's information etc.
Wherein, When data source is the GIS database,, the real of implementation space geodata to share because different GIS manufacturers adopts different data layouts with organizational structure; Must eliminate the isomerism of these data sources; Therefore, the Conversion of Spatial Data of different-format in the traditional GIS database is become the GML form through GML format conversion algorithm, make obtain on the spatial data describing method unified.In the practical implementation process; The conversion of GML form spatial data, at first will be from the spatial data of unprocessed form reading of data, with the data abstraction that reads; Again construct the document object of tree structure, generate the spatial data of GML form then according to the document object tree that generates.Need to prove, change the spatial data of different-format, need the different access interface of definition.In reading of data, respectively geographical geometric data and attribute data in the spatial data are read internal memory, according to the document object of these data configuration tree structures.The first root node of structure document object, constructor node successively then.Wherein, each root node is corresponding to the title of certain geographic object of irrigated area, and each child node under this root node comprises attribute datas such as geometric datas such as spatial form and geographic coordinate corresponding to the spatial character of this geographic object.After in internal memory, generating the document object tree, the GML linguistic norm according to OGC (Open Geographic Information System association) formulates writes newly-built GML format file with said document object tree.At first write the root node of document object tree; Check then whether this node exists the child node that does not also write,, then write the geographical geometric data and the attribute data of this child node if having; And it is labeled as writes; Return father node then, repeat above step, up to all child nodes that write this root node.In GML format conversion process, also to consider the conversion of spatial data type, be the substandard corresponding data type of GML with the legacy data type conversion, for example; Shapefile is different to the describing mode of geological information with the GML form, and Shapefiles comprises 4 kinds of geometric data type Point, PolyLine, Polygon; MultiPoint, GML comprise 7 kinds of geometric data type Point, LineString; Polygon, GeometryCollection, MultiPoint; Therefore MultiLineString and MultiPolygon will become the corresponding type of GML form to the type conversion of Shapefiles form, and the data type corresponded manner is as shown in table 1.
Table 1
| Shapefile geometric data type | Point | PolyLine | Polygon | MultiPoint |
| GML geometric data type | Point | MultiLineString | MultiPolygon | MultiPoint |
Perhaps convert the available data source of different-format to general GML document through newly-built GML spatial geography data, realized the unification on the spatial data describing method, reached the basic demand of sharing of spatial geography data.But the data volume of spatial geography data is huge, need store and manage through spatial database.Spatial database based on GML is in conceptual phase at present, therefore considers to adopt ripe relation data library storage GML communal space data.Specifically, store spatial data and space element data in the Share Model through PostgreSQL database with GIS spatial data expanded function.Wherein PostGIS is the expansion of PostgreSQL, and spatial Information Service functions such as spatial object, spatial index, spatial operation function and spatial operation symbol are provided.In the practical implementation process, can the irrigated area spatial data be stored into the PostGIS spatial database of its expansion with irrigated area space element data storage to the PostgreSQL database.Wherein, space element data and spatial data are all stored respectively with layer mode according to the irrigated area space diagram layer that is provided with in advance, for example, can the irrigated area geographic range be divided into water system layer, resident stratum, monitoring point layer, plough layer, path layer, boundary layer etc.
The space element data are with the formal description of XML, and structure and data type are simple relatively, can be mapped as the list structure of relational database according to XML Schema and DTD; Field in the data corresponding relation database table; For example, a table of the corresponding PostgreSQL database of space element data of each figure layer, the corresponding gauge outfit of metadata attribute names; The value of data is as shown in table 2 in the property value correspondence table.
Table 2
| Figure layer title | Data source | Western boundary | The border, east | Northern border | The Bubba border | Engineer's scale |
| Beijing | Shapefile | 115.20 | 117.32 | 41.05 | 39.28 | 1∶100000 |
| The Chongqing City | MIF | 56.17 | 664.19 | 7.10 | 77.61 | 1∶10000 |
Spatial data of each figure layer is divided into geographical geometric data and attribute data again, and the mode of expression has two kinds of vector and grids, stores through the PostGIS database.Specifically, with vector data abstract be key elements such as point, line, surface.As shown in table 3, " point " comprises the end points of isolated point, line, the head and the tail point of face, and the set of the point of each figure layer can be stored as a table separately; As shown in table 4; " line " is divided into starting point, terminal point and segmental arc, and the set of the line of each figure layer is stored as a table according to the topological relation in space, and gauge outfit is starting point, terminal point and segmental arc, and is as shown in table 4; " face " is divided into polygon and segmental arc, and the set of the face of each figure layer is stored according to spatial topotaxy, and gauge outfit is polygon and segmental arc, and the length of segmental arc field is uncertain, and is as shown in table 5.Raster data is divided into pixel stores, the corresponding table of each pixel, the geographic coordinate and the geographical attribute value of this pixel of storage are as shown in table 6 in the table.Here, the segmentation of figure layer helps the management and the application of geodata, helps the expression and the expression of space key element.
Table 3
| Period | Coordinate |
| 1 | X1Y1 |
| 2 | X2Y2 |
| 3 | X3Y3 |
| 4 | X4Y4 |
Table 4
| Segmental arc | Starting point | Terminal point |
| A1 | N1 | N2 |
| A2 | N2 | N3 |
| A3 | N1 | N3 |
| A4 | N1 | N4 |
| A5 | N2 | N5 |
| A6 | N3 | N5 |
| A7 | N3 | N4 |
| A8 | N4 | N5 |
Table 5
| Polygon | Segmental arc |
| B1 | A1A2A3 |
| B2 | A2A5A6 |
| B3 | A3A4A7 |
| B4 | A6A7A8 |
Table 6
| The pixel title | The pixel numbering | Longitude coordinate | Latitude coordinate | Sea level elevation |
| Decision center | 1 | 115.90 | 36.98 | 113 |
| Monitoring station 1 | 2 | 115.20 | 37.24 | 112 |
| Monitoring station 2 | 3 | 115.57 | 38.20 | 120 |
S3: customize access interface, and receive the data in the said GML spatial database through said interface based on GML; That is,, realize the cross-platform sharing of irrigated area spatial data through the interface of customization based on the GML form.
In the practical implementation process,, can customize the space element data-interface, at Web server customization spatial data interface at map server because the WebGIS server of present embodiment adopts MapServer map server and Apache Web server; The customization of data-interface can realize under the J2EE environment, not be described further at this.
S4: the spatial data to the GML form of said reception is analyzed and is handled, and generates corresponding irrigated area geographic information contents according to geographic position, irrigated area, the message form of customization;
Specifically; Position, form according to the geography information of customization; The corresponding geographical data access service is provided, and these data access service can comprise: realize the demonstration of map through the GML data-switching being become vector data forms such as SVG, VML, VRML; The relevant information that shows the inquiry irrigated area is carried out analysis statistical treatments such as data contrast according to historical data and real time data, generates irrigated area spatial data statistical study chart; These historical datas and real time data can comprise data such as the precipitation, evaporation, soil water-containing, actual used water, weather condition, water distribution scheduling, personal information in irrigated area.
S5: these results among the step S4 are passed to client browser through the GML interface that customizes among the step S3.
Specifically, the user can through client browser to the irrigated area map show, basic operation such as output, convergent-divergent, roaming, geographic element selection; Can also obtain the information such as weather information and crop growth conditions, channel hydraulic pipeline situation, soil moisture content in irrigated area through spatial data statistical study chart.
As shown in Figure 2; The realization system of the irrigated area Spatial Data Sharing method based on WebGIS of the present invention can be made up of " client browser ", " WebGIS server " and " database server " three-layer network structure; The irrigated area spatial data exchanges between each layer through the GML form, and wherein the interface of WebGIS server also is based on the GML form.
Specifically, the realization system of present embodiment comprises:
Client browser, user input instruction also shows corresponding irrigated area geographic information contents according to said instruction;
The data source data administration module obtains the geodata of corresponding irrigation areas according to user's request by GIS database and/or internet, sets up the GML spatial database according to said geodata;
GML spatial data analysis treatment module receives the data of said GML spatial database and analyzes and handle, and generates the required geographic information contents of client and also sends to client browser;
WebGIS server: realize the data transmission between client browser, data source data administration module, the GML spatial data analysis treatment module.
Wherein, the data source administration module also comprises the Data Format Transform submodule: with the Conversion of Spatial Data in the GIS database is the GML format file.
Further, this system also comprises the access interface customized module, is the data-interface of said WebGIS server custom based on the GML form.
The principle of work of this each module of system can not done detailed description at this referring to the description of appropriate section among the preceding method embodiment.
In addition, native system can carry out forecast of need water and the irrigated area optimized dynamic water distribution scheduling of soil moisture content forecast, irrigated area crop through the irrigated area spatial data analysis forecast model of expansion.The irrigated area data that the monitoring station, irrigated area will be monitored through system platform in real time send to the server at irrigation decision center, and can read irrigated area each item information and irrigated area water allotment decision-making through system platform.The irrigated area decision center can be checked the real-time water water situation that needs of each monitoring station, irrigated area, is responsible to define irrigated area water operation plan.Monitoring point, irrigated area and irrigated area decision center are carried out the management and the interoperability of irrigated area spatial data through the WebGIS platform, realize the scientific allocation of irrigated area water and the informationization of irrigated areas administration thus.
Above embodiment only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (6)
1. the irrigated area Spatial Data Sharing method based on WebGIS is characterized in that, comprises step:
S1: obtain the geographic information data of corresponding irrigation areas according to user input instruction from a plurality of data sources, wherein, said data source comprises GIS database and internet electronic map web site;
S2:, set up the GML spatial database based on the said geographic information data that obtains according to the GML geographic information data sharing model that presets;
S3: according to said GML geographic information data sharing model is WebGIS server custom access interface, and receives the data in the said GML spatial database through said access interface;
S4: the data of said reception are analyzed and handled, the geographic information contents that generates corresponding irrigation areas is set according to the user;
S5: said irrigated area geographic information contents is sent to client browser through said access interface, operate demonstration according to the client;
Said step S2 further comprises:
S201: the irrigated area geographical space is divided into a plurality of figure layers according to geographical spatial object;
S202: the said geographic information data that obtains is divided into space element data and spatial data; Wherein, Said space element data comprise figure layer metadata and data set metadata, and said spatial data comprises the geometric data and the attribute data of each geographical space object in the irrigated area;
S203:,, store said space element data and spatial data respectively with layered mode according to the figure layer of said irrigated area geographical space through having the database of GIS spatial data expanded function;
And when said data source is the GIS database, between step S202 and 203, also comprise: with said Conversion of Spatial Data is the GML document format, specifically comprises following substep:
S21: newly-built GML document;
S22: read geographical geometric data and geographical attribute data in the said spatial data respectively;
S23: according to said data configuration document object tree of reading; Wherein, Each root node is corresponding to the title of a geographical space object in the irrigated area, and each child node of said root node comprises the geographical geometric data and the geographical attribute data of said geographical space object;
S24: said document object tree is write said GML document: at first write all root nodes of said document object tree, write all child nodes of each said root node then successively.
2. the method for claim 1; It is characterized in that, among the said step S203, said space element data storage is arrived the PostgreSQL database; A table of the corresponding PostgreSQL database of space element data of each figure layer; The corresponding gauge outfit of the Property Name of space element data, the value of data in the property value correspondence table, the incidence relation between each table is corresponding to the spatial relationship between the geographical space object of irrigated area.
3. the method for claim 1 is characterized in that, among the said step S203, stores said spatial data into the PostGIS spatial database, with said geometric data abstract according to the division of figure layer be point, line, surface; Wherein, said point comprises the end points of isolated point, line and the head and the tail point of face, and the set of the point of each figure layer is stored as a table separately; Said line is divided into starting point, terminal point and segmental arc, and the set of the line of each figure layer is stored as a table according to the topological relation in space, and gauge outfit is starting point, terminal point and segmental arc; Said face is divided into polygon and segmental arc, and the set of the face of each figure layer is stored as a table according to spatial topotaxy, and gauge outfit is polygon and segmental arc; With attribute data is that unit stores with the pixel, the corresponding table of each pixel, the geographic coordinate and the geographical attribute value of this pixel of storage in the table.
4. the method for claim 1 is characterized in that, among the said step S3, is the customization of the MapServer map server in WebGIS server space element data-interface, is the customization of the Apache Web server in WebGIS server spatial data interface.
5. like the realization system of any described method among the claim 1-4, it is characterized in that, comprising:
Client browser is used for the geographic information data according to user input instruction demonstration corresponding irrigation areas;
The data source data administration module is used for obtaining the geographic information data of corresponding irrigation areas according to user input instruction from GIS database and/or internet electronic map web site, and sets up the GML spatial database according to said geographic information data;
GML spatial data analysis treatment module is used to receive the data of said GML spatial database and analyzes and handle, and generates the required geographic information contents of client and also sends to client browser;
The WebGIS server is used to realize the data transmission between said client browser, data source data administration module, the GML spatial data analysis treatment module;
Said data source data administration module also comprises: the Data Format Transform submodule, and the Conversion of Spatial Data that is used for the GIS database is the GML document format;
Said data source data administration module also comprises: the data storage submodule is used for storing said space element data and spatial data respectively with layered mode.
6. realization as claimed in claim 5 system is characterized in that also comprise: the access interface customized module is used to the data-interface of said WebGIS server custom based on the GML form.
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| KR100712046B1 (en) * | 2005-11-25 | 2007-05-02 | 김지만 | Traceability Management System and the Method Based on Geographic Information System by Internet |
| CN100583926C (en) * | 2007-01-18 | 2010-01-20 | 北京邮电大学 | Telecommunication traffic forming method and system facing position service |
| CN101256590A (en) * | 2008-04-03 | 2008-09-03 | 北京艺龙天地文化传播有限公司 | Simulation system for three-dimensional on-line virtual reality of environment combining with WebGis and method thereof |
| CN101295172B (en) * | 2008-05-12 | 2010-11-10 | 福建省电力有限公司 | Electric network synthetic disaster prevention system based on geographic information system |
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| TWI814361B (en) * | 2022-04-27 | 2023-09-01 | 力鼎環境科技有限公司 | GIS |
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