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

[Johannes Radinger]

Am 27.06.2011 um 02:56 schrieb 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!

I think you have to have all the input maps with the same spatial extend and the
same grid resolution to be able to process it with r.stream.*
Did you check for that?

/johannes

> 
> Should I be getting this error message? 
> 
> Thank you,
> 
> Justin Jent
> 
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