| 摘要 |
A system and method for providing efficient access to digital map data. An embodiment of the present invention is generally related to systems for accessing, displaying, editing and using digital maps. In some map data formats each map item is not necessarily stored or encoded using a consistent byte length. Instead, to save overall storage requirements, the map items can be stored as different byte length variables. In accordance with an embodiment, the system comprises a bit stream processor that provides a staging area for efficient reading and writing of map data, and also provides security for adjoining data portions that use different byte length variables. An input map or map data can be read into the system, and optionally written to an output map. As map data is read into the system, instead of reading it directly from disk storage to the display screen, which takes time, the bit stream processor places the map data in memory and reads it from there. As map data is written to the system for storage or output, the bit stream processor can cache the map data in the cache, and write it from there.
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