SELECTIVE DOWNLOAD OF CORRIDOR MAP DATA

摘要

A method for displaying a map on a mobile client device (24). The method includes storing map data on a server (28), the map data including road data with respect to roads (70, 72, 74) of multiple different road types. The server determines a route (40) from a starting point (42) to a destination (43) within an area covered by the map data, the route including one or more route segments (44, 46, 48, 50, 52). The server defines a corridor map including the route segments and the roads of the different road types that are within different, respective distances, determined by the road types, of the route segments. The server downloads the road data with respect to the route segments and the roads of the different road types included in the corridor map to the client device. The client device, using the downloaded road data, renders one or more images, each image comprising at least a respective portion of the corridor map.