从类别数据库中手动导出注册的数据库别名。
Manually export the registered database aliases from the catalog database.
同时他们也提供了庞大的类别数据库，便于你进行分类。
You can also search their large database of channels, which are conveniently categorised for you.
不确定性是评价分类专题类别数据质量最主要的方面。
Uncertainty in the classified remotely sensed data is one of the most important elements of the data quality.
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