Remote Sensing Digital Image Processing In Three-dimensional Terrain Visualization Applications

Along with the increase of remote sensing technology and digital image processing arithmetic, the resolving power of space, spectrum and radiation are more and more detailed the capability of us distilling information from remote sensing image developed fast, these information are important parameters of space model in many fields.The rendering of 3D terrain scene is playing a key role in many research fields such as virtual reality, geographic information system and simulation system, etc. It's third dimension can not be replaced by other way. As we know the build of third dimension scene needs a lots of real remote sensing images, theirs combination is one efficient way to high third dimension.This paper combines digital image processing with the ChunHui program of Ministry ofEducation------"The Basic Research about Digital Museum of Karst Topography Based on GirdingTechnology", investigates modeling and visual arts of 3D terrain scene.The LOD (levels of detail) algorithm is researched. We bring up one way of terrain rendering based on vertex stack. Using the display-list and face-cut can improve the efficiency of the rendering. The methods of gaining the height fields from the remote sensing images supplied by the China and Brazil Earth Resource Satellite are described. The rendering of the region around the FanJingShan is preliminarily realized by using the technologies discussed above.In the field of great terrain rendering, the real-time, multi-tasks and blocking terrain rendering based on same distinguish is put forward. Because of same distinguish there are no cracks among blocks. The final sense is no different between great-block and multi-blocks. The exercise proves that this method is fast and working well.During the process of multi-wave-band images amalgamation, weighted arithmetic average method, pyramid method and PCA (principal component analysis) method are analyzed. We bring up alternating weighted average method of image amalgamation based on RGB bit planes. We choose three wave band images according to OIF (optimum index factor), alternate weight, and assign to RGB bit planes. We realized true color image processing both in space domain and frequency domain. Such as image enhance and filter.A framework based on RGB bit planes is established to manage the texture partitions and the corresponding terrain blocks. We elementarily realize real-time rendering of the region around the FanJingShan.