PRE-FETCHING MAP TILE DATA ALONG A ROUTE

摘要

A path made up of several points including an origin, a destination, and intermediate points, is determined. Map data is fetched from an external map database to a local memory of a client device prior to detecting a need to use the map data for rendering maps at the client device. To this end, respective priorities of the points are determined, amounts of map data to be fetched are determined based on the determined priorities, and map data is fetched in accordance with the determined priorities, so that a first amount of map data is fetched for a point with a first priority and a second amount of map data for a point with a second priority, where the first amount is greater from the second amount. Respective digital maps of the one the geographic areas are generated using the pre-fetched map data stored in the local memory.

主权项

1. A method for pre-fetching map data for generating digital maps at client devices, the method comprising:
determining, by one or more processors, a path made up of a plurality of points including a first geographic location defining an origin, a second geographic location defining a destination, and intermediate points; fetching, by the one or more processors, map data from an external map database to a local memory of a client device prior to detecting a need to use the map data for rendering maps at the client device, wherein the map data is usable for rendering digital maps of geographic areas disposed along the path, including:
determining respective priorities of the plurality of points,determining amounts of map data to be fetched based on the determined priorities,fetching map data in accordance with the determined priorities, including fetching a first amount of map data for a point with a first priority and a second amount of map data for a point with a second priority, wherein the first amount is greater from the second amount; and generating respective digital maps of the one the geographic areas using the pre-fetched map data stored in the local memory.