| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a database (10) for a navigation device. <P>SOLUTION: The database includes digital elevation model data defining a three-dimensional surface. The database (10) stores, for plural tiles of a tiling, a first array (23) including three-dimensional coordinates of vertices of plural triangulated irregular networks, TINs, and a plurality of second arrays (24, 25). Each of the second arrays (24, 25) respectively defines triangular faces of a TIN and includes a plurality of vertex indices of the vertices to define triangular faces of the respective TIN. A method of outputting a three-dimensional representation of a terrain and a method of generating the database are also described. <P>COPYRIGHT: (C)2013,JPO&INPIT |
