Xuelian ChenJingtao HuLiancheng ShanYaping WangExtraction and Code of Drainage Network Based on Digital Elevation Model.468-4732009HIS (3)https://doi.org/10.1109/HIS.2009.308https://doi.ieeecomputersociety.org/10.1109/HIS.2009.308conf/his/2009db/conf/his/his2009-3.html#ChenHSW09