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So I am trying to calculate stream order using the Strahler method. I have vector data from NHD in high resolution and was wondering if anyone has ideas on how to assign stream order using vector data. I prefer opensource solution. Any ideas?

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  • You can try the Strahler plugin, but you'll have to manually select each "root" segment in order to compute the Strahler order.
    – ArMoraer
    Commented Nov 7, 2016 at 8:17

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NHDplus has stream ordering built-in. However, it is only available for the contiguous lower 48 states. I recently finished a Strahler ordering project for a large part of Alaska. Since NHDplus data was not available for my project area, I used the ArcMap RivEX tool to generate Strahler ordering using the traditional NHD data. The results were splendid.

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An answer using Whitebox Tools if stream network doesn't have a plus version: Strahler ordering of existing vector stream network data with a DEM (SRTM)

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