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I would like to know why most TauDEM specialized tools have been developed just for the D-Infinity flow model. Is it because the D8 would not make sense for these algorithms, or they just have not been implemented? In the first case, what is the reason?

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Mostly this is a matter of implementation. They have not been implemented. Typically, each tool was historically developed in for a specific project or purpose and this development process has not resulted in complete consistency in the functionality available. I think all the algorithms would make sense with D8 too. Two of the tools (DinfAvalanche, DinfDistUp) have a parameter that sets a threshold for flow proportions to use in the accumulation. Setting this threshold to 0.5 (or 0.499 to numerically be >= 0.5) gives a result equivalent to D8. This could be added to each tool (given time and funding), and it would be good if there was a systematic process of upgrading each tool to include this threshold parameter so that equivalent D8 options are available to users.

If there is a developer who wants or needs this, these tools with an existing threshold could be used as a guide for implementation of others. A fork and pull request in the github repository (https://github.com/dtarb/taudem) could be used to request inclusion of code changes in the official releases.

  • Thank you for your answer. I hope TauDEM will receive attention as it is an important tool for many applications. – francesco lc Aug 28 '18 at 12:36

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