back to first page ..

Pour les lacs, dans la couche lacs upstream_a correspond à cont_pixel du riversegments aval dans la couche riversegments . #63

How to join the lakes with the riversegments layer

Differents "types" of lakes :
Lake 1 : upstream_a=350 = cont_pixel du riversegement 1 Lake 2 : uptream_a=60826=cont_pixel du riversegment 2 (and pfafstette lake2 = pfafstette riversegment2) Lake 3 : upstream_a=0 (but several cont_pixel=0)

• Some are on the same river segement --> one cont_pixel in riversegments = one upstream_a
• Some cross different river segements --> severals cont_pixel = one upstream_a
• Some are not on a river segement

The "shape_area" variable is more accurate than "area" variable, same as "shape_leng" and "perimeter"