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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 :[[BR]]
[[Image(source:data/Docs/trac/Lakes/Lakes4.jpg,500px)]]
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
||[[Image(source:data/Docs/trac/Lakes/Lakes3.jpg,500px)]]||[[Image(source:data/Docs/trac/Lakes/Lakes1.jpg,500px)]]||[[Image(source:data/Docs/trac/Lakes/Lakes2.jpg,500px)]]||

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