Abstract
] Paik [2008] presents a new algorithm for the extrac-tion of surface flow paths from gridded elevation data,arguing that ‘‘significant improvement over the limitationof D8 and D8-LTD [methods] can be achieved using a newand simple idea without introducing any model parameter’’[Paik, 2008, paragraph 9]. However, all Paik’s [2008]arguments against Orlandini et al.’s [2003] D8-LTD methodcan be shown to be unsubstantial merely on the basis ofgeometrical considerations. The purpose of the presentcomment is to point out that (1) an analytical backgroundto support the decision to set the dampening factor l equalto 1 in the D8-LTD method does exist and (2) resultsobtained from incorrect implementations of the D8-LTDmethod are used in the investigation of Paik [2008]. Furtherconsiderations on Paik’s [2008] analysis of the D8-LTDmethod are also provided.[
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