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Method and system for computing road grade data

  • US 6,856,897 B1
  • Filed: 09/22/2003
  • Issued: 02/15/2005
  • Est. Priority Date: 09/22/2003
  • Status: Expired due to Term
First Claim
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1. A method of obtaining data for a geographic database comprising:

  • providing data indicating a plurality of locations along roads, including data indicating altitudes at the plurality of locations;

    computing road grade values for a plurality of subsections of the road, each of the subsections being a portion of the road between two of the locations;

    identifying a plurality of temporary change points, each of the temporary change points joins two adjacent subsections having road grade values that differ by a value greater than a predetermined amount;

    computing a road grade value for each part of the road between adjacent temporary change points;

    grouping consecutive parts of the road having road grade values that fall within a predetermined range into at least one constant road grade section; and

    storing data that define the constant road grade section in the geographic database.

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