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Bitmap array for optimally distributing map data content to wireless communications devices

  • US 8,483,947 B2
  • Filed: 08/10/2007
  • Issued: 07/09/2013
  • Est. Priority Date: 04/25/2007
  • Status: Active Grant
First Claim
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1. A method of distributing map data from a map server to a wireless communications device, the method comprising:

  • obtaining vector map data in response to a request for map data received at the map server from the wireless communications device;

    generating a bitmap array that is a low-resolution representation of the vector map data for a particular location specified in the request;

    computing attributes of the bitmap array to determine which map features are to be retained and which map features are to be omitted;

    simplifying the map data by omitting at least one map feature to thereby provide simplified map data; and

    transmitting to the wireless communications device only the simplified map data for the map features to be retained.

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