ACTGIS: A Web-based collaborative tiled Geospatial image map system

In the past few years, the Web has become a de facto deployment environment for new application systems. Web-based Geospatial image map systems make satellite remote sensing data available to a wider range of public users than ever before. The storage and organization of global massive multi-dimensional remote sensing data have a big impact on the performance of Web mapping systems. To implement a performance-optimized Web mapping system, we propose a global grid division pyramid hierarchical data model for massive remote sensing data management, and adopt Hilbert curve allocation method for data placements. Collaborative web map browsing is also very important for many applications such as crisis management, military activities and government decision-making. However, realizing collaboration functionality on the basis of the stateless HTTP protocol, optimized for client requests, is not trivial. The limitations of the Web's request/response architecture prevent server from pushing real-time dynamic Web data. To address this problem, we propose a web-based interactive collaborative browsing framework based on server push technique (Comet). Moreover, we develop a prototype system called ACTGIS. Finally, we evaluate the prototype system using real remote sensing datasets, which demonstrate the good performance data access in our system.