栅格瓦片的融合显示与性能优化研究  

Study on the fusion display and performance optimization of raster tile

作　　者：刘阳成[1] 聂颖[1] 高龙[1] 谢贤博 刘睿智 LIU Yangcheng;NIE Ying;GAO Long;XIE Xianbo;LIU Ruizhi(R&D Depatment of GIS and Graphic&Image,North China Institute of Computing Technology,Beijing 100083,China)

机构地区：[1]华北计算技术研究所地理信息与图形图像研发部,北京100083

出　　处：《测绘科学与工程》2020年第3期63-67,共5页Geomatics Science and Engineering

摘　　要：本文介绍了栅格瓦片的应用背景及栅格数据的特点,针对高分辨率数据有限,在高分辨率数据边缘地区融合显示次高分辨率数据的需求,设计了瓦片状态标记位,应用于不同级别瓦片的融合显示,可以解决瓦片显示不完整的问题;针对性能优化需求,提出了基于位图缓存的拉伸融合处理以及并行两级缓存技术。经工程实践应用,证明该技术方案可行;试验结果表明,显示效果满足需求,显示耗时降低为原来的1/3左右。The application background of grid tiles and the characteristics of raster data are introduced in this paper.As the high resolution data is limited,it is necessary to fuse and display sub-high resolution images into the marginal zone of high resolution images.Tile flag bits are designed and applied to fusion display of different levels of tiles,which can solve the problem of incomplete display.According to the requirement of performance optimization,a stretch fusion processing method based on bitmap caching is proposed,and the parallel two-level caching technology is designed.The application in engineering practice verifies the feasibility of technical solution.The test results show that the display effect meets the requirement and the display time is reduced to about one third of the previous one.

关 键 词：栅格数据 瓦片数据模型 显示流程 并行处理 显示性能优化 

分 类 号：P283[天文地球—地图制图学与地理信息工程]