| 摘要 |
Architecture for encoding (or packaging) vector-object data using fixed boundary tiles. Tiling a large vector database provides the same advantages that tiling provides for a large raster image. Tiling the dataset means that the set of all possible browser requests is finite and predetermined. The tiles can be rasterized on a client once the tiles have been received from a server. Alternatively, the server can do the tiling and rasterizing, and then send the raster data to the client for presentation and user interaction. Tiles can be precomputed on the server, with selected tiles then transmitted to the client for rasterization. Moreover, tiles can be cached for improved performance, and prefetched based on user interactivity on the client. Summarization of the vector-object data can be accomplished at the server using a configurable plug-in interface.
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