Remote sensing supplies continuous information sources to environment surveying and monitoring in a large region. GIS is a powerful tool to management and analysis spatial data.
遥感技术为大范围的环境调查和监测提供了时间和空间上连续覆盖的信息源，GIS技术为空间数据的管理和分析提供了有力的工具。
Region is one basic unit of spatial analysis in GIS applications, which is a kind of entity existing widely in many fields such as environment science, land information science and so on.
区域是GIS空间分析的基本单元。它是环境科学、土壤科学等领域中广泛存在的一类地理实体。
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