| 摘要 |
Road network data can include two dimensional (2D) coordinates corresponding to junctions and non junctions in the road network. Height values for roads at junctions can be obtained from optimizing a cost function or as input. Height values for roads at non junction locations can be obtained from a height function defined using the height values for the junctions. Pitch, yaw, and roll vectors can be obtained for non junction locations using the height function, the 2D coordinates, and one or more road parameters, respectively. These vectors can define a coordinate frame for the road, along with which a width can provide points for defining polygons for the road. Road surface data can be constructed from the polygons. The polygons can be provided to a device display for rendering of a three dimensional image of navigation data. |
