| 摘要 |
PURPOSE: A space error parameter about a 3D building and topography is provided to supply the rapid geometric expression of a 3D object. CONSTITUTION: If each parameter is less than a threshold value, a mobile device selects another LoD(Level of Detail) for a part of a 3D object or/and 3D topography(S260,S263). If no, the mobile device maintains an LoD previously mapped or selected for the part of the 3D object or/and the 3D topography(S265). The mobile device displays the part of the 3D object or/and the 3D topography according to geometric expression having the selected LoD(S270). [Reference numerals] (AA,DD) No; (BB,CC) Yes; (S210) Distances to all 3D objects or/and 3D topography viewable from the current position of a range measuring device are determined; (S220) LoD(TIN) for each viewable 3D object or/and 3D topography is selected according to LoD mapping with respect to distance or distance range; (S230) Whole parameters are set?; (S240) Whether to display at least part of a 3D object and/or 3D topography using a geometric expression with an LoD different from the LoD selected in the step S220 is determined based on the determination of each parameter; (S250) Considering the3D object or/and 3D topography in the step S240; (S260) Each parameter≤Critical value; (S263) Selecting another LoD for part of the 3D object or/and 3D topography; (S265) Maintaining the LoD for part of the 3D object or/and 3D topography; (S270) Part of the 3D object or/and 3D topography according to a geometric expression with the LoD selected in the step S220 and the step S263 or S265 is displayed
|
