[GRASS-user] r.stream.extract with external flow accumulation maps

[jentjr]

All,

I am trying to use r.stream.extract with the National Hydrography Dataset
Plus, which includes elevation, flow direction and flow accumulation maps. I
recently read the paper by Jasiewicz and Metz that states, "...network
modeling is based on accumulation maps that are created internally or
created with an external GIS software or as the result of map algebra."
However, I get the following when I try to use the module with the NHDPlus
data:

ERROR: Accumulation map does not match elevation map!

Should I be getting this error message? 

Thank you,

Justin Jent

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