近二三十年来，各国编制了大量的水文地质图，积累了极其丰富的经验。
Many countries have produced the hydrogeological maps and accumulated a wealth of experience in the last two or three decades.
以农安幅1：20万综合水文地质图空间数据库的建立为例，介绍了利用GIS建立空间数据库的全过程。
Space database of 1: 200 000 Comprehensive Hydrograpric Geological Map of Nong' an is an example of GIS in application. The whole process of establishing the space database using GIS was introduced.
以农安幅1：20万综合水文地质图空间数据库的建立为例，介绍了利用GIS建立空间数据库的全过程。
Space database of 1: 200 000 Comprehensive Hydrograpric Geological Map of Nong' an is an example of GIS in application. The whole process of establishing the space database using GIS was introduced.
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