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Rendering map images using modifications of non-raster map data

  • US 9,830,064 B2
  • Filed: 01/05/2015
  • Issued: 11/28/2017
  • Est. Priority Date: 09/26/2011
  • Status: Active Grant
First Claim
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1. A computer-implemented method in a map server for providing map data to client devices via communication networks, the method comprising:

  • generating first map data in a vector format organized into a set of two or more tiles, for displaying a first map image at a client device, the first map image corresponding to a perspective of a camera panned to a certain location at a certain zoom level, the map data including (i) a plurality of individually renderable map elements associated with a same tile in the set, each map element illustrating a respective physical entity, and (ii) a depth indication that specifies an initial order in which a first one of the plurality map elements is rendered relative to a second one of the plurality map elements overlapping the first one of the plurality map elements;

    providing the first map data to the client device via a communication network;

    generating, at the map server, modification data in a vector format specifying a difference between the first map data and a second map data, wherein the second map data is for displaying a second map image corresponding to the same perspective of the camera panned to the same location at the same zoom level, including providing a new depth indication that specifies a new order in which the first one of the plurality map elements is rendered relative to the second one of the plurality map elements; and

    providing the modification data to the client device via the communication network for generating the second map image using the first map data and the modification data.

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