Construction of geo-spatial information public service platform based on cloud computing

1, cloud computing technology ideas

Cloud computing (Cloud Computing) was first proposed by Google CEO Schmidt at a search engine conference in 2006, and originated from Google's senior engineer Christophe Bisciglia. Google101 "Project, it is another new technology thought after the big transformation of mainframe computer to client-server (Client-server) in the last century 80. Cloud computing is an internet-based computing method in which software and hardware resources and information that are shared can be supplied to computers and other devices on demand, running in the same way as the current state grid. Cloud computing is Grid computing (Computing), distributed Computing (distributed Computing), parallel Computing (Parallel Computing), Utility computing (Utility Computing), Networked storage (receptacle Storage Technologies), Virtualization (virtualization), load balancing (load Balance) and other traditional computer and network technology development and integration of products. Cloud Computing provides an internet-based new IT service growth, usage, and delivery model that typically involves providing dynamically scalable and frequently virtualized resources over the Internet. Typical cloud computing technology applications are often provided by a service provider with a common network business application that can be accessed through software such as browsers or other Web services, while software and data are stored on the server. Cloud computing is divided into three tiers of services: Cloud devices (Infrastructureasa Service,iaas), cloud platforms (Platformasa Service,paas) and cloud software (Softwareasa Service,saas), That is, from three aspects of equipment, platform and software to provide cloud computing technology services.

Cloud computing has four salient features: first, cloud computing can provide the most reliable and safest data storage center, users do not have to worry about data loss, virus intrusion and so on, and secondly, cloud computing on the client's hardware device configuration requirements are lower, software use services convenient; Cloud computing can easily realize the data and application sharing services between different devices and can span different platforms; Finally, cloud computing provides an almost limitless number of possibilities for future use of network data, with huge potential for expansion.

2, cloud Computing in the application of GIS potential

The advent of cloud computing technology for traditional computing and Internet Information sharing brought many changes, "on-demand computing resources, flexible expansion of infrastructure," and other advantages of cloud computing technology in different areas of IT solutions used, and with a large number of information sharing and innovative service methods. Cloud computing is expected to be an industry-wide application. If every city has the need for e-government, however, in different regions and different industries, the specific requirements of e-government will be different, which would lead to the increase in the cost of hardware and software services; Similarly, with the spatial geographic information exponentially increasing, in the relevant GIS industry for GIS platform suppliers and project developers, Its development difficulty and resources investment will also rise. With the support model of cloud computing technology, the advantage of information sharing of geo-information public service platform will be reflected in the reduction of project cost, the reduction of repetitive input and waste of resources, and the rapid construction and deployment of GIS application. GIS applications based on cloud computing technology are of great potential value to suppliers, developers, users and the industry as a whole.

April 2011, ESRI Software Research and development director and ArcGIS Product chief designer Scottmorehouse on the application of cloud computing technology in the GIS potential also said: cloud computing to promote GIS information sharing there are many ways, One of them is that the web system architecture makes it easier to access GIS applications through leasing or hosting services, while at the same time, it is possible to realize the openness, WebGIS or privatization of geo-spatial information through technology, so as to ensure the security of information sharing; for the network Geographic Information System (), The biggest hurdle is building and managing servers, using cloud computing technology to make it easier to use cloud computing as a hosting environment, to build and manage traditional enterprise servers and services, or to serve as virtual data centers for servers. It can be said that cloud computing services reduce the threshold for GIS use, which allows the use of extensibility like azure framework to create new lightweight services, so it can be easier to manage and service from the client Web.

3. The construction of geo-spatial information public service platform supported by cloud computing technology

Geo-spatial information is an important strategic information resource, which plays a more and more important role in government management decision, new industry development and people's life improvement. With the scientific decision-making of Government, the informatization of national economic and social Development and the construction of harmonious society, the demand of authoritative and reliable geospatial information Service is increasing with the government departments and the public at all levels. Therefore, the construction of geo-spatial information public service platform will be a direction of the development and construction of national surveying and Mapping department in the future.

The general goal of the construction of geo-spatial Information public service platform ("Public Service Platform") proposed by the state: by 2015, the establishment of a more comprehensive public geographic information system, the establishment of a "one-stop" online geo-information Cooperative service mechanism, the establishment of land, transport, forestry, Water Conservancy, civil affairs, public security and other departments of Interconnection, To form a shared exchange mechanism of geo-information resources, and finally to build a geo-information public service platform based on e-government internal and external network, which provides online map and geographic Information service for Government macro-decision, national emergency management and social public service. Improve the National Geographic information public service ability and level under the information condition comprehensively.

The construction of public service platform is a large and complex system engineering with complex technology, wide scope and long period, and it is also a large and complicated project with diverse user participation, using a variety of technical environments, including multiple data sources, and establishing various applications. The platform uses a three-tier distributed service model (see Figure 1) and a three-tier technology model (see Figure 2).

The Public service platform is composed of the main node, the branch node and the information base, the main node, the node and the information base rely on the national, provincial and municipal three-level geographical information service agencies, respectively, the nodes of different levels to manage the data at various scale levels, the nodes through the electronic government within/outside the network to achieve vertical and horizontal interconnection, in the cloud hardware, Cloud software and cloud services for the technical support of government departments, enterprises and institutions and the public to provide application services.

Data is the blood and foundation of geo-spatial information public service platform, how to ensure the continuous operation of information platform, protect the most valuable data assets of information platform, the key of the stable development of geo-spatial information public service platform. According to data confidentiality requirements, the Public Service platform network system is divided into the dense wan and the non-dense wan, in which the dense WAN uses the E-Government intranet to realize the exchange and sharing of the secret-related geographic information, constituting the surveying and Mapping service network, and the non dense WAN uses the e-government extranet and the Internet to realize the non In addition to the special needs, the public service platform should avoid directly exposing the data itself, and using the cloud computing technology model can greatly improve the security and confidentiality of the data.

With the continuous improvement and development of the public service platform, there will be more and more key business and data in the platform network system, it is necessary to provide a high reliability and high availability of geospatial information Service Network, but the network system is always from natural disasters, human factors and technical factors such as destruction and invasion. Using cloud computing technology can quickly and conveniently realize data disaster backup and recovery function, greatly improve the security of data.

4. Conclusion

At present, cloud computing technology has been used in the ArcGIS Online, Supermap Company's Super Mapsgs, Google Google Earth and other Webgis applications, and the service efficiency is very good. With the deep application of cloud computing technology in the construction of geo-spatial information public service platform, the application service and industry development of GIS in our country will be more prosperous.