Trái Đất tương tác với các vật thể khác trong không gian bao gồm Mặt Trời và Mặt Trăng. Hiện nay, thời gian Trái Đất di chuyển hết 1 vòng quanh Mặt Trời bằng 365,26 vòng nó tự quay quanh trục của chính nó. | Sharing of Distributed Geospatial Data through Grid Technology national climate data center Ramapriyan et al. 2006 . The data volume will increase significantly if similar models of finer spatial resolutions such as 1 km are used. The models are being changed and refined from time to time and new geospatial data the NASA EOS data and NOAA climate data are being collected by satellites continuously. A fixed computing environment that contains only static data sources will not fulfill such kind of geospatial applications. Consequently a capability of seamless and dynamic accessing to large quantities of distributed geospatial data is the key to the success of today s and tomorrow s geospatial applications. Although much progress in high performance computing has been made in recent years there still lacks a mechanism to enable global-scale integration and sharing of large quantities of data such as geospatial data from large-scale heterogeneous and distributed storage systems. Fortunately the emerging Grid technology might be able to solve this problem. Grid technology is a form of distributed computational technology that involves the coordination and sharing of computing application data storage and network resources across dynamic and geographically dispersed organizations Foster et al. 2001 . Resource sharing in a Grid is highly controlled. Resource providers and consumers define clearly and carefully what is shared who is allowed to share and the conditions under which the sharing occurs. Individuals and or institutions agreeing to follow such sharing rules form a virtual organization VO . The resource sharing across multiple VOs is enabled by the Grid technology. The intrinsic advantages ofthe Grid technology fit the problems of the sharing of distributed geospatial data very well Di 2005 . The Globus Toolkit currently at version 4 is an open source toolkit for building Grids provided by the Globus Alliance. It provides many useful components and services that
