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Thread: how to calculate Moran's I based on the distance along river

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    Wayne Zhang
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    Default how to calculate Moran's I based on the distance along river

    I have some monitoring sites in a basin. I wan to calculate the Moran's I based on the distance along the river instead of Euclidean distance. How to do that? Thanks!

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    William Huber

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    Default Re: how to calculate Moran's I based on the distance along river

    Calculate the distances (perhaps with a set of costdistance calculations based on a raster representation of the river or with a network-based calculation based on a vector representation). Then proceed as usual. Detailed guidance for computing Moran's I from a set of (arbitrary) distances appears, inter alia, at http://www.ats.ucla.edu/stat/r/faq/morans_i.htm.
    --Bill Huber
    Quantitative Decisions
    For more help, visit the worldwide community at http://gis.stackexchange.com

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    Wayne Zhang
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    Default Re: how to calculate Moran's I based on the distance along river

    thanks. how to calculate the distance along river network? Is there any tool in ArcGIS?

  4. #4
    William Huber

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    Default Re: how to calculate Moran's I based on the distance along river

    To calculate distances along a river network, either use Network Analyst (treating the rivers as a route) or Spatial Analyst (with its CostDistance functionality).
    --Bill Huber
    Quantitative Decisions
    For more help, visit the worldwide community at http://gis.stackexchange.com

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