Rough set is a novel mathematical tool for dealing with uncertainties and imprecision of geographic information, which can be used to represent uncertainties in multi-levels spatial knowledge.

• 摘要粗集是一种处理地理信息不确定性和不精确性的新型数学工具，在揭示和表达多层次（或粒度）的空间知识方面具有较大优势。