摘要
针对国家空间数据交换中心的安全性问题，通过一个实例从数据存储、数据库维护、动态网页技术（ＡＳＰ）进行了深入的研究和探讨，并进一步说明了ＡＳＰ技术在动态站点安全性维护中的诸多优势。
Though GIS industry in China has made an unprecedented progress in recent years, there exist difficulties and challenges due to all kinds of reasons such as the lack of proper policies, standards for data sharing, high-quality technical personnel and so on. Obviously, it is very important for most of GIS users to get geospatial information quickly and easily. The development of Interent and corresponding techniques makes it possible. National Geospatial Data Clearinghouse (NGDC) is a distributed network of geospatial data producers, managers, and users linked electronically (Clinton, 1994). It is one of the most important activities in the National Spatial Data Infrastructure (NSDI). What's more, it will be in favor of the nation-wide geospatial data sharing and decrease the repeated investment of the GIS industry. Based on the authors' experiences of setting up a NGDC model Web site, this paper attempts to present some significant aspects about the security of NGDC based on active server puges (ASP). They include data storing, database maintenance, new technical supporting and so on. Firstly, this paper analyzes how to provide the security of data which is saved in the hosts of NGDC. The security model of 'Networks-DB Server-DB-DB Object' is also presented in it. In Windows NT Server, Internet Information Server (IIS) is in charge of transferring message and the management of Web sites. ASP is also based on IIS. The advantages of virtual directory technique provided by IIS are emphasized. As a NGDC Web site example, the NGDC model Web site at the Research Center of GIS in WTUSM is also mentioned. Because it is only a model Web site where the transmission of digital spatial products is not included in the functions. However, the management of spatial metadata is more important and some functions of metadata query are implemented. It is illustrated clearly in the functional diagram of the NGDC model Web site.
出处
《武汉测绘科技大学学报》
CSCD
2000年第1期66-69,共4页
Geomatics and Information Science of Wuhan University
关键词
ASP技术
空间数据
交换中心
安全性
GIS
active server pages (ASP)
National Geospatial Data Clearinghouse (NGDC)
GIS
