| 摘要 |
Some embodiments of the invention include a method for selecting a set of data files comprising surface data in a plurality of different detail levels for downloading from a server computer, the surface data being associated with a portion of a three-dimensional surface in an image scene, the data files being stored as nodes of a hierarchical file system characterized in that the selection process comprises assessing whether the portion of a three-dimensional surface is visible in an actual image scene. If it is not visible, the selection process is resumed with a sibling or an uncle node; if it is visible, the selection process continues with determining whether the surface data meets the criteria of a predefined resolution quality factor. |
