利用改进主动轮廓模型的自动跟踪功能，实现河流的最终提取。
Utilizing automated tracking function of an improved snake model extracts river finally.
利用GIS的数据库功能，将参数化过程中提取的模型参数纳入到数据库中统一管理。
Using GIS database function, the model parameters extracted from the process parameterization were managed in the database.
在此基础上，提取系统功能，分析故障处理流程，建立故障信息管理系统信息模型。
On the base of summarizing system function and analyzing failure maintenance flow, the information model of failure management system is built.
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