| 摘要 |
An ontology-based search engine enabling search criteria to be defined within a Virtual Earth visualization system. The search criteria can be entered directly as a set of ontology-based keywords or "search terms" and together with a number of optional spatio-temporal search criteria that are combined to become a spatial database query which is subsequently submitted to a spatial database whereby the search results are returned to the search client, for display directly into the Virtual Earth visualization system.
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