发明名称 |
Method and system for computing road grade data |
摘要 |
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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申请公布号 |
US6856897(B1) |
申请公布日期 |
2005.02.15 |
申请号 |
US20030667769 |
申请日期 |
2003.09.22 |
申请人 |
NAVTEQ NORTH AMERICA, LLC |
发明人 |
PHUYAL BISHNU;ALWAR NARAYANAN;DORUM OLE HENRY |
分类号 |
G01C21/26;G01C21/28;G06C21/00;G06F17/30;G06T17/05;(IPC1-7):G06C21/00 |
主分类号 |
G01C21/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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