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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