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.
在这个方法中，首先获得应该显示的类别数据，然后再使用populate方法相应创建GUI内容。
In this method, you first obtain the category data that should be displayed and then create corresponding GUI content using the populate method.
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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