The basic properties of urban spatial environment are important spatial factors which affect urban crime.
城市空间环境的基本属性是影响城市犯罪的重要的空间因子。
Distance estimation is the behavior in actual spatial environment, which is based on acquiring the distance knowledge.
环境空间距离估计任务就是获取环境空间距离知识基础上的实际空间行为。
These services have a much closer relationship with surrounding spatial environment, so are called Location-Based service.
这些服务跟空间位置密切联系，我们称之为基于位置的服务。
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