Research And Implementation Of Raster Ocean Data Real Time Rendering Technology

Nowadays,with the development of science and technology,countries,especially developed countries,pay more and more attention to the field of marine industry.Marine informatization may become a new scientific and technological revolution.China's economic strength is increasingly strong,but due to the late start of the development of science and technology in China,many technologies are not mature enough.In order to realize the marine power strategy as soon as possible,China is increasing the investment in marine resources,marine information data and marine science and technology.In order to develop marine science and technology,it is necessary to make good use of marine data resources.However,due to the characteristics of multi-source heterogeneous marine data,it is almost unrealistic to make full use of it.In the process of visualization and rendering of marine data,the utilization rate is very low because of the lack of unified classification and analysis of data.In view of this,this paper proposes an improved LOD algorithm based on Morton coding.Through coding compression and spatial multi-scale reconstruction,it realizes the real-time rendering technology according to the change of user's view range,and applies this technology to the development and implementation of marine data visualization rendering system.The main research results are as follows(1)In order to solve the problem of distortion in vector data rendering,this paper uses Bresenham algorithm to rasterize vector lines.At the same time,aiming at the problems of large amount of computation and ambiguity in rasterization of vector surface by ray algorithm,this paper proposes an improved scan ray algorithm to rasterize vector surface Lattice processing.(2)In order to ensure the fluency of the system in data rendering,this paper proposes a spatial multi-scale reconstruction technology which improves the traditional LOD technology through Morton coding.In order to reduce the load of nodes,Morton coding is introduced to encode the raster data and compress the duplicate data.Finally,the raster ocean data is constructed into layers with different spatial scales and resolutions to realize the real-time display and rendering of ocean data.(3)Aiming at the problem of invalid nodes being loaded,this paper proposes a spherical bounding box method,which judges the view range according to the calculation formula of view cone plane,and eliminates the data outside the view range,so as to reduce the rendering of invalid nodes.By introducing the dual control factor node evaluation system,the degree of node subdivision is calculated.In order to better realize the repair of rendering cracks,this paper proposes an adaptive crack repair method.Through the experimental test and analysis,this method can significantly improve the repair speed of cracks.(4)In order to effectively reduce the CPU consumption in the process of data processing,this paper uses Geo Server as the map server,which can easily store and pull data.In order to achieve interactive rendering of data,this paper uses webgl as the rendering technology.After the system test,it is proved that the improved method proposed in this paper can realize the visualization rendering of ocean data well.