Considering the unity of construction standards, data security, practicality of data maintenance and updating, stability of platform operation, convenience of platform application expansion and diversity of user functional requirements at different levels, urban basic geographic information platform adopts the architecture mode of combining B/S and C/S, and is designed in layers and developed in the form of components and services, which unifies different applications and services oriented to basic geographic information databases and reduces the coupling degree of internal functional operations at each level. Based on the basic geographic information database, the platform integrates all kinds of thematic information, realizes a complete system of resource integration, data sharing, data updating and maintenance, and provides rich basic geographic information services for relevant departments inside and outside surveying and mapping units. The overall framework of the platform is shown in Figure 2.
2 Platform construction content
2. 1 Establishment of information standard system
Informatization standard system is the basis of urban basic geographic information data production and platform construction. The standard system of platform informatization adopts scientific theories and methods. On the basis of strictly referring to and following the relevant national, local and industry norms and standards, combined with the actual data production and application, the current standards are supplemented, improved and refined, and the data standards that can support automatic lossless conversion, supervision and warehousing processing of the platform are formulated. Meet the whole process of basic geographic information data from production, supervision, conversion, warehousing, application, update, quality inspection and control, data exchange, service distribution and so on. , to guide the research and development of urban basic geographic information platform, and to stipulate all links, steps, submission results and corresponding inspection specifications of platform construction and implementation. The achievements of informatization standard system construction mainly include: large-scale topographic map data processing and storage standard, urban basic geographic information classification and coding standard specification, urban comprehensive underground pipeline detection technical specification, urban comprehensive underground pipeline data processing and database building standard specification, urban planning achievement data processing and database building standard specification, image data database building standard specification, metadata standard specification, and urban data exchange and sharing.
2.2 Basic Geographic Information Database Construction
Basic geographic information database is the core content of urban basic geographic information platform construction, which determines the development of platform application and thematic expansion application. In the specific construction, combined with the data situation and actual needs of urban survey units, the full coverage of the contents of the geographic information database closely related to urban survey within the survey units has been realized, and a comprehensive, accurate, dynamic, current, multi-resolution, multi-level and multi-scale basic geographic information database has been built, which can support spatial data search, data update, data statistics, data analysis, data fusion and data deep mining. The contents of the database mainly include: topographic database, underground pipeline database, planning achievement database, place name address database, image database, road network database, control survey database, surveying and mapping benchmark database, thematic database, business database, meta-database and other spatial and attribute databases.
2.3 Urban Basic Geographic Information Platform Development
EsriARC-GIS 10 is used as the GIS platform and Oracle 1 1g is used as the physical storage medium for data in the development of urban basic geographic information platform, MicrosoftVisualStudio2008.NET. NET as a development platform, using the GeoDatabase data model provided by Esri company to store and manage spatial data. For the part of C/S architecture mode, C# and ArcEngine components are used to develop core component library, general component library and basic component library, which are used to build platforms and thematic application subsystems. For the part of B/S architecture mode, ArcGISServer application interface and WebService are used to realize various service publishing and system customization. The platform development aims at serving surveying and mapping and the application of relevant departments, and is mainly divided into internal services and external services: ① Internal services mainly refer to the internal services of urban surveying units, mainly including: assisting surveying and mapping production departments to produce surveying and mapping data, assisting information centers to build, update and maintain basic geographic information data, and providing units with a unified and integrated platform for obtaining basic geographic information resources, basic geographic information services and comprehensive GIS operation functions.
3 platform application example
In the process of urban basic geographic information platform construction, several application subsystems are implemented and expanded closely around the platform construction framework. Taking the underground pipeline integrated management information system and a map of urban and rural planning as an example, the rationality, practicability and advancement of the platform construction are demonstrated: ① The underground pipeline integrated management information system based on the platform provides an effective way for the safe operation and management of municipal facilities, and can quickly realize the comprehensive functional operations such as tube explosion analysis, cross-sectional analysis and three-dimensional analysis, and Figure 5 shows the three-dimensional underground pipeline; (2) Relying on the platform to provide data interface and * * * services for the Construction and Development Bureau, the managers of the planning office can use the basic topographic base map data and planning thematic data for business approval, which greatly improves the decision-making analysis ability and scientific planning. Figure 6 is an urban and rural planning map.
4 conclusion
Urban basic geographic information platform aims to serve the data production of surveying and mapping units and the application services of government departments, enterprises and institutions, and is the bearing of the whole urban information system. Taking standardized data production, regulatory transformation, warehousing update and * * * sharing release as the main line, we will comprehensively integrate basic geographic information resources and build an infrastructure and comprehensive geographic information service system that adapts to the development of informationization. At present, the achievements of urban basic geographic information platform have been successfully applied to municipal administration, planning, urban management and other fields. With the rapid development of information technology and the accelerating pace of urban construction, the application prospect of the platform will be broader, and the achievements of the platform will be more deeply and widely used in education, health and other fields.
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