中文摘要：

首先阐述空间数据网络渐进传输的概念、关键支撑技术以及意义。其次，总结了国内外相关研究的现状，分析了空间数据网络渐进传输研究方面的技术难点。最后结合目前国内该方面最新的研究成果对空间数据网络渐进传输的研究趋势做了进一步展望。

英文摘要：

This paper presents the concept, key techniques of the progressive transmission of spatial data over the Internet, summarizes the state-of-the-art of related studies, and comments on the latest research progress in the world. Finally, this paper concludes with an outlook and several key techniques of the progressive transmission of spatial data over the Internet.