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Some problem with the function import colum or with the calcuation into postgre or R with area/1e6[[BR]]
The area of some upstream segment are null so the up_ in the clc or the up_catchment are not calculated and give "NA"

Use :[[BR]]
{{{
ccm<-loaddb_all(ccm)
ccm@data$c_area<-ccm@data$area/1000000
import_column(ccm,newcolumn="c_area",newcolumntype="numeric",display=FALSE)
}}}

to verify !