[GRASS-user] simple way to get Easting and Northing coordinates of stream outlet directly from r.watershed?

[Helmut Kudrnovsky]

jamaas wrote
> I'm using GRASS 7.0.3 (text) on Ubuntu Linux, and running it either from 
> a bash shell script or from an R file.
> 
> I've worked out a workflow that does what I want, but it is very long 
> and convoluted, so I'm wondering if there is a simple way to extract the 
> Easting and Northing coordinates of the lowest point on the stream 
> network, such that I can then use them as inputs for r.water.outlet?
> 
> Here is my workflow, realise it is long
> 
>  1. run r.watershed to get drainage, streams, and basin
>  2. run r.stream.order to calculate strahler order and get strahler
>     raster map
>  3. use r.stats and some bash code to extract highest strahler number
>     from the strahler map
>  4. use r.mapcalc .... not sure why, inherited this bit from someone!
>  5. use r.stats to get data from stream dem into a text file
>  6. use some bash and awk code to extract the Easting and Northing
>     values of the lowest point in the text file created from the stream
> dem
>  7. use r.water.outlet to create new drainage map for the basin
>  8. use r.lfp  to calculate longest flow path, also uses the Northing
>     and Easting values of the outflow point
> 
> 
> So I guess what I'm looking for is a simpler way to get the Northing and 
> Easting values of the lowest point, directly from r.watershed or 
> something analogous.
> 
> All suggestions most welcome. Thanks

have a look at

https://grasswiki.osgeo.org/wiki/R.basin#Preparation_for_multiple_basins.27_analysis

maybe for some inspirations.




-----
best regards
Helmut
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