Research Of Global Remote Sensing Image Browser System Based On Octahedron Discrete Global Grids Model

As space technology and information technology continue to progress and improve, especially in the global remote sensing and global positioning technology,the scope of the remote sensing dynamic monitoring extended to global.It is possible for people to obtain multi-resolution,massive,real-time observation data of the earth.With these information people can research global sustainable development,monitor resources and environmental changes,forecast disaster early-warning,defend national security and so on.Under this background,the traditional data model plane can not fully meet the global spatial information management.It is an effective way to build a global, continuity,and dynamic levels of spherical data model to solve the problem.The new model will settle the limitations of the traditional model.In this paper,the studies are around the discrete global grids model,finish the main job is as follows:1.The paper analyzes existing limitations of the traditional plane model in applying on large regional or global scope.It classifies the internal and abroad studies in three types,then lists the main features of discrete grids model.It also introduces the differences between discrete global grids model and the traditional vector model,grid model,makes some simple comparison between virtual earth products both at home and abroad,and explains its video display Principle and defects.2.Second followed the spherical surface based on octahedron achieves a recursive subdivision and QTM subdivision,and region of interest for local high-precision subdivision.Global grids in any way can not reach the ideal of equal-area,such as shape,but cell shape and size distribution have the law,with the subdivision level increases,the changes tended to stabilize so as to ensure the reliability in applying during deeper the level of subdivision.3.Defines the grid unit encoding Morton code,which is unique encoding. Accordance with the Morton code can search the grids within a certain range. Implement the conversion between Morton code and latitude longitude through algorithm.Introduce spherical distance and area measurement method.4.Introduce the image transformation method in Clarendon Laboratory of Oxford University and in Resources Institute of China Mining University.Analyze the transformation method between remote sensing and global grids.Have designed discrete global grids file storage method,files management and indexing.5.The discrete global grids are applied in astronomical observations,atmospheric circulation study.Introduce Discrete Grids image applications with FengYun No.3 data.