Data processing: vehicles – navigation – and relative location – Navigation – Employing position determining equipment
Reexamination Certificate
2005-02-15
2005-02-15
Hernandez, Olga (Department: 3661)
Data processing: vehicles, navigation, and relative location
Navigation
Employing position determining equipment
C701S209000, C340S995240
Reexamination Certificate
active
06856897
ABSTRACT:
A method of obtaining data for a geographic database is disclosed. Data indicating a plurality of locations along roads including data indicating altitudes at the plurality of locations is provided. Road grade values for a plurality of subsections of the road are computed; each of the subsections is a portion of the road between two of the locations. A plurality of temporary change points are identified as joining two adjacent subsections having road grade values that differ by a value greater than a predetermined amount. Road grade values for each part of the road between adjacent temporary change points are computed. Consecutive parts of the road having road grade values that falls within a predetermined range are grouped into at least one constant road grade section. The geographic database stores data that define the constant road grade section.
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Alwar Narayanan
Dorum Ole Henry
Phuyal Bishnu
Hernandez Olga
Kaplan Lawrence M.
Kozak Frank J.
Navteq North America, LLC
Shutter Jon D.
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