It extracts the channel network from the drainage directions in five possible ways:
  1. by using a threshold value on the contributing areas, then only the pixels with contributing area greater than the threshold are the channel heads (mode 0)
  2. by using a threshold value of the estimated stress tangential to the bottom (mode 1)
  3. by using a threshold value on the estimated stress tangential to the bottom only in convergent sites (mode 2)
Individuated the beginning of the channel incision, the points upriver are considered as canalized.

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