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Urban fraction in WRF/UCM

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Hi,everyone,I've encountered a problem when I reading one paper.
I'm not sure that if the "urban fraction" in the following sentence refers to variable LANDUSEF which is in geo_em.d0x file,if so,then I could't understand why the urban fraction is a constant value,and I checked my geo_em file and found it is not a constant is there anyone who learned the WRF/UCM konws what the "urban fraction" refers to?


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