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= Difference between '''up_catchment_area''' et '''up_area''' =
see riversegments comment in postgre 

 * '''area (m²)''' of the unit basin where upstream node are not calculated
 * '''up_catchment_area''' is area calculated from downtream node see R script which is run on all up_blabla columns as it not calculated on strahler rank 1 (most upstream basins)
 * '''up_area (km²)''' is sum area of the unit basins from upstream node including this segment catchment surface


c_area (km²)=area/1000000[[BR]]