Tile-Based System for the Rapid Display of Symbolized Digital Nautical Chart Data

摘要

For efficient retrieval and display of Digital Nautical Chart (DNC) imagery, a tiled-based approach is presented. By preprocessing the data into persistent image tiles, the presented method can minimize or eliminate image processing steps during the retrieval process. Tile-based approaches define constant image sizes and scales for geographic regions, therefore tiles can be pregenerated and stored in a format needed for transmission to users. This greatly improves the performance of applications that visualize DNC data and allows for advanced caching of DNC imagery tiles. In addition, the evenly- spaced and commonly-sized images are stored in files that are easily indexed allowing for simple and fast lookup of DNC imagery tiles for a given geographic area.