| 摘要 |
A method for providing map data to a client device includes receiving, at a server from the client device over a network, a request for parameters related to map data for a region of interest, where each region of interest is a separate geographic area. The method also includes providing, for use by the client device, a local zoom table indicating each zoom level for which new map data is available and usable by the client to determine whether or not to request new map data in response to a zoom command. Providing the local zoom table includes generating the local zoom table by analyzing tile data from multiple zoom levels to determine a progression order of map tile zooms to be requested by the client. |
