{
  "$type": "site.standard.document",
  "description": "A navigation device (1) for a vehicle (8) comprises a database (2a, 2b) storing, for a plurality of tiles of a tiling, at least one triangulated irregular network, TIN, defining a three-dimensional surface, and, for a plurality of triangular faces of the at least one TIN, control information…",
  "path": "/patents/990962",
  "publishedAt": "2013-05-08T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01C21/3638",
    "HARMAN BECKER AUTOMOTIVE SYS [DE]"
  ],
  "textContent": "A navigation device (1) for a vehicle (8) comprises a database (2a, 2b) storing, for a plurality of tiles of a tiling, at least one triangulated irregular network, TIN, defining a three-dimensional surface, and, for a plurality of triangular faces of the at least one TIN, control information defining a nested bounding sphere for the respective triangular faces. The navigation device (1) comprises further a processor (3) coupled to said database (2a, 2b), configured to calculate a screen-space error for the plurality of triangular faces based on the respective control information (16) and based on at least one of the following: a viewing angle of an electronic map view, a virtual camera position of the electronic map view. The processor is configured to predict whether a triangular face is visible in the electronic map view based on the calculated screen-space error.",
  "title": "Navigation device, method of predicting a visibility of a triangular face in an electronic map view"
}