Abstract:

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.

Key words: virtual globes, multi-scale image, tile pyramid, real-time creating, parallel computing