| 摘要 |
Embodiments of the present invention comprise a method for transmitting map data, a method for displaying map data, a system for processing and displayi ng map data, and a method for rendering line segments on a pixel display. A preferred method for transmitting map data comprises receiving, layering ~220~, and simplifying map data and transmitting some of the simplified data ~240~. A preferred method for displaying map data comprises receiving compressed map data ~250~, decompressing the received data ~3~, and renderin g the decompressed data ~3~ on a display device. A preferred system for processing and displaying map data comprises a map database ~110~, a map generation sub-system, a map rendering sub-system, and a display device. A preferred method for rendering line segments on a pixel display comprises, f or a line segment from a first endpoint to a second endpoint, rounding off the slope of the line segment and calculating pixel locations based on that rounded off slope.
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