In this paper, multilevel water gathering basins are separated and extracted automatically with filtering from geographic map based upon their differences in frequency domain.

利用多级汇水盆地在频率域(或波数域)中的频率差异，通过滤波方法逐级分离，并提取它们。

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Unlike the USA, which has been a well-established federation on roughly the same geographic map over a century, EU is still a collection of states in an area where ethnic diversities, racial differences, ideology and economic antagonism have changed the map several times.

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