面向虚拟地球系统的多尺度影像瓦片数据实时创建技术

Creating Tile Pyramid in Real-time for Multi-scale Images Using Virtual Globes

针对传统虚拟地球系统对多分辨率影像预先切片构建瓦片金字塔,导致的数据通用性差、数据更新效率低等问题,提出了一种实时创建多尺度影像瓦片数据的改进技术。设计并构建多尺度影像金字塔模型,对影像进行逻辑上的裁剪和接边处理,并将多尺度影像金字塔工程发布为数据服务,基于多核处理器设计影像切片并行算法实现用户实时响应请求。采用World Wind虚拟地球系统选择广东及海南区域的多源影像进行试验,试验结果证明该技术能够方便地管理影像数据,满足虚拟地球系统的并发访问需求,并能极大地提高数据更新效率。

In this research we propose an improved approach of creating tile pyramid in real time for multi-scale images to resolve the problems of poor versatility of image data and low efficiency of data updating caused by traditional virtual globes to create tile pyramid beforehand. In the proposed model,clip and mosaic of images in logic sense are obtained,and then the tile pyramid project is published as data service,and tile data is created in real time by a parallel computing program based on multiprocessor. The model was trialed with Worldwind using the multi-source images of Guangdong and Hainan Provinces. Test results show that the present method is convenient in managing original image data and responding customers＇ requests. Meanwhile,it remarkably improves the efficiency of updating image data.