The National Spatial Data Infrastructure (NSDI ) is also known as the National Spatial Information Infrastructure (NSDI ). NSII Covers the policies and technologies used to produce, manage and share geospatial information in a country. It is a broad topic, and this chapter focuses on discussing technical issues of information sharing and collaboration in NSDI.

The concept of NSDI originated in the United States in the early 1990s and has been around for about 20 years. In the first ten years of NSDI’s construction, it was mainly government-centered and relied on data copying, such as CD-ROM and FTP, to share geographical information. This method often requires the recipient to have certain GIS software and hardware to carry people and use the received data. Moreover, this method can also cause problems such as time delays. It has become an inefficient way to share geospatial information, and even an efficient way to share geospatial information. Potential obstacles. The current World Wide Web provides new theories and technologies for information sharing and collaboration, including Web services, service-oriented architecture, cloud computing, aggregation and bottom-up information flow. The new generation of NSDI , namely NSDI 2.0, should make full use of these new technologies to make them efficient in time and flexible in use. It can attract extensive participation from governments, enterprises, scientific and educational institutions, etc., as well as individuals, and can achieve greater Reutilization of geographical information to maximize its value. These advantages have been reflected in many successful projects.