In order to overcome this limitation,sketch-content based spatial data retrieval was presented.
针对这一局限性,提出了一种基于草图内容的空间数据检索算法。
<Abstrcat>Effective data source selection strategy is one of the important issues of the spatial information retrieval.
合理高效的数据源选择策略是提高空间信息检索系统效率的重要因素之一。