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Spatial indexing method and apparatus for navigation system for indexing and retrieval of XML map data

  • US 20100287207A1
  • Filed: 05/08/2009
  • Published: 11/11/2010
  • Est. Priority Date: 05/08/2009
  • Status: Active Grant
First Claim
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1. A method of spatial indexing a plurality of map cells and retrieving map data from the map cells for a navigation system utilizing XML map data, comprising the following steps of:

  • establishing a plurality of map cells for spatial indexing where the map cells divide an administrative region expressed by XML map data into small units where the XML map data is configured in a multiple-layered structure;

    determining a layer in the multiple-layered structure of the XML map data on which the map cells are established for the spatial indexing;

    selecting a type of tracing curve for sequentially indexing the plurality of map cells that divide the administrative regions;

    assigning index numbers consecutively to the plurality of map cells with the sequence determined by the selected tracing curve; and

    repeating foregoing steps for all of the map cells in all of the layers of the XML map data, thereby creating a map database in the XML format with the spatial indexes for all of the map cells.

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