Tianmap.com is loaded with geographic information data covering the whole world, which are presented in vector, image and 3D modes in all directions and from multiple angles, and can be roamed and zoomed in and out. The data of China covers the whole territory of China from macro to micro townships and villages. When the general public logs into the website of "Tianmap", they can see 1:1 million vector data and 500-meter resolution satellite remote sensing images covering the whole world, 1:250,000 public version map data, navigation electronic map data, 15-meter and 2.5-meter resolution satellite remote sensing images covering the whole country, 0.6 million vector data and 500-meter resolution satellite remote sensing images covering more than 300 cities above the prefecture level, and 0.6 million vector data covering the whole country. Geographic information data such as 0.6-meter resolution satellite remote sensing images of cities above prefecture level, is currently the most complete geographic information service website with the most complete data resources in the region of China.

Through the "Tianmap" portal, users can conveniently access the Internet to realize two-dimensional and three-dimensional browsing of various levels and types of geographic information data, and perform common operations such as searching and positioning of geographical names, distance and area calculation, marking of points of interest, and taking screenshots and printing. The public can also access the completed provincial and municipal geographic information service portals in the form of hyperlinks to obtain more personalized services around the world and enjoy direct access to the provinces and municipalities. In addition, on "Tianmap", users can also access the national surveying and mapping results catalog service system to learn about the surveying and mapping results of the country, provinces (autonomous regions) and cities, and link to the relevant geographic information service websites of the State Bureau of Surveying and Mapping to obtain information including "Dynamic Map It can also link to the relevant geographic information service websites of the State Bureau of Surveying and Mapping and obtain thematic geographic information such as "Dynamic Map" and "Map Witnesses to Brilliance". Tianmap contains 1:1,000,000 vector data and 500-meter resolution satellite remote sensing images covering the whole world, 1:250,000 public version map data covering the whole country, navigation electronic map data, 15-meter resolution satellite remote sensing images, 2.5-meter resolution satellite remote sensing images, and 0.6-meter resolution satellite remote sensing images covering more than 300 prefectural-level and above-prefectural-level cities in the country. Remote sensing images and other geographic information data, is currently China's most complete geographic information service website in the region of data resources. To emphasize one more point, different from the ordinary map website, Tianmap has made it possible to provide users with services in the form of both portal website and service interface.

Different from ordinary map websites, Tianmap provides services in the form of both portal and service interface. Ordinary users can conveniently access the Internet to realize two-dimensional and three-dimensional browsing of various geographic information data, search and positioning of geographical names, distance and area measurement, marking of points of interest, and printing of screenshots and other operations. After authorization, commercial map websites such as navigation, catering, hotels, etc. can freely call relevant geographic information service resources, load thematic information, and develop value-added service functions, thus greatly saving the costs required for geographic information collection, updating and maintenance. Based on different network environments and user groups, the China National Geographic Information Public **** Service Platform is divided into three versions: public, government and classified, with the Internet-based public version of the platform being "Sky Map". The opening of the platform meets the growing demand for geographic information from the public, and also shows that China's geographic information public ****service capacity and level have been significantly improved, which will fundamentally change the way China's traditional geographic information service is provided.

The State Bureau of Surveying and Mapping has organized the construction of the national geographic information public **** service platform with the aim of strengthening the development and utilization of basic geographic information resources, changing the traditional service mode, and transforming the single provision of maps and data into the online provision of geographic information services. The development of map service software is the technical basis for realizing this transformation, the significance of which is reflected in the fact that the results of surveying and mapping are important strategic information resources of the country, which are directly related to national strategic security. For enterprises and professional departments, after authorization, they can make use of the secondary development interface provided by "Tianmap" to freely call the geographic information service resources of "Tianmap" and embed them into the existing GIS application system or use the "Tianmap" software to provide geographic information service online. The API (Application Programming Interface) provided by "Tianmap" can be used to build new GIS application systems. Various types of commercial map websites that provide thematic information services (such as navigation, catering, hotels and restaurants) are able to load thematic information and develop value-added service functions on the public **** geographic information platform built by them, which eliminates the need for them to deal with and maintain the data of the public **** geographic framework and bear the high costs of the underlying geographic information services, and avoids the waste of personnel, funds and time caused by the repeated collection of the basic geographic information as well as maintenance and updating, and greatly reduces the number of people and time wasted. It avoids the waste of personnel, capital and time caused by the repeated collection of basic geographic information and maintenance and updating, and greatly reduces the cost and cycle of developing GIS application systems or websites, so that these operators can focus their main efforts on website operation and value-added services instead of the collection and maintenance of public **** geographic information. At present, the "Sky Map" service has been applied in the "National Disaster Geographic Information System", realizing the aggregation and integration service of disaster thematic data and the "Sky Map" map service.

Geographic information is an important strategic information resource of the country, playing an increasingly important role in government management decision-making, information resources*** enjoyment, and improvement of people's lives. With the rapid development of Internet technology, the public demand for the open use of surveying and mapping results and geographic information is becoming more and more urgent, and the construction of China's own geographic information service website has become an inevitable trend in the development of geographic information industry.

In 2009, the State Bureau of Surveying and Mapping completed the top-level design and prototype construction of the national geographic information public **** service platform; in the first half of 2010, the National Center for Basic Geographic Information (NCBGI), a subsidiary of the State Bureau of Surveying and Mapping, completed the "Tianmu" public geographic information service platform. The data on the platform is based on unified standards and specifications, and is produced and serviced by national, provincial and municipal surveying and mapping departments and relevant professional departments and enterprises in a "sub-built***sharing, collaborative updating and online integration" manner.

As the public version of the national geographic information public **** service platform running on the Internet, the "sky map" portal is the "general entrance" and "main node" of the public geographic information service. The portal is the "general entrance" and "main node" for public geographic information services. Its official opening not only meets the public's growing demand for geographic information and enriches people's daily lives, but also signals a significant improvement in China's geographic information public ****service capacity and level, highlights the wide application of surveying and mapping technology and geographic information resources in society and people's livelihoods, and recapitulates the rapid and healthy development of the geographic information industry, which will powerfully promote the development of the national economy and the process of social informatization.

With the development and application of "Sky Map", geographic information data resources will continue to be enriched, especially the results of provincial and municipal surveying and mapping departments, such as "Digital Provinces and Districts" and "Digital Cities". In particular, the achievements of provincial and municipal surveying and mapping departments, such as "Digital Provinces and Regions" and "Digital Cities", will be incorporated into "Tianmap" in the form of network interconnection and service aggregation, and information silos will be eliminated gradually by technological means, so that users will be able to enjoy a more comprehensive, complete, detailed and accurate geographic information service; at the same time, the relevant enterprises will use "Tianmap" as a platform for the development and application of geographic information. At the same time, relevant enterprises will use the public *** geographic information services provided by "SkyMap" as the basis for value-added development of thematic information services related to the public's food, clothing, housing and transportation, such as public transportation inquiries, navigation, catering and so on, in order to provide the public with richer, more informative and more convenient geographic information services. In the near future, Tianmap will become a Chinese brand of Internet geographic information service with global data coverage, rich and informative content, convenient and fast application, high-speed and reliable service, and independent property rights.

It marks a significant progress in the construction of China's national geographic information public **** information service platform, and fundamentally changes China's traditional geographic information services, helping to promote the information **** enjoyment, to avoid the duplication of geographic information data collection, and to ensure the security of national geographic information.