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

James_Maas_MED · April 26, 2016, 12:27pm

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
J

--
Dr. Jim Maas
University of East Anglia

Blumentrath_Stefan1 · April 26, 2016, 1:02pm

Hi,

Did you consider using:
https://grass.osgeo.org/grass70/manuals/addons/r.stream.basins.html
?

Cheers
Stefan

-----Original Message-----
From: grass-user [mailto:grass-user-bounces@lists.osgeo.org] On Behalf Of Jim Maas
Sent: 26. april 2016 14:28
To: grass-user@lists.osgeo.org
Subject: [GRASS-user] simple way to get Easting and Northing coordinates of stream outlet directly from r.watershed?

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
J

--
Dr. Jim Maas
University of East Anglia

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

hellik · April 26, 2016, 1:16pm

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
--
View this message in context: http://osgeo-org.1560.x6.nabble.com/simple-way-to-get-Easting-and-Northing-coordinates-of-stream-outlet-directly-from-r-watershed-tp5262970p5262976.html
Sent from the Grass - Users mailing list archive at Nabble.com.

James_Maas_MED · April 26, 2016, 1:43pm

Hi Stefan,

Thanks for this. I've had a look but not tried it yet. Just for me to clarify, are you suggesting that:

1. r.stream.basins will somehow produce and output the Easting and
Northing values of the overall outlet?
2. r.stream.basins, will replace most of this workflow and thus the
Eastings and Northings will not be required explicitly?

In the case of 1, I can't quite see how it will output these values?

Thanks a bunch,

J

On 26/04/16 14:02, Blumentrath, Stefan wrote:

Hi,

Did you consider using:
https://grass.osgeo.org/grass70/manuals/addons/r.stream.basins.html
?

Cheers
Stefan

-----Original Message-----
From: grass-user [mailto:grass-user-bounces@lists.osgeo.org] On Behalf Of Jim Maas
Sent: 26. april 2016 14:28
To: grass-user@lists.osgeo.org
Subject: [GRASS-user] simple way to get Easting and Northing coordinates of stream outlet directly from r.watershed?

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
J

--
Dr. Jim Maas
University of East Anglia

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

--
Dr. Jim Maas
University of East Anglia

Bartolomei.Chris · April 26, 2016, 5:03pm

Hi Jim,
I've used r.stream.extract a fair amount. It produces a downstream-oriented vector. In layer 2 of the output stream vector map the "cat" value of 2 indicates outlet points. See (https://grass.osgeo.org/grass64/manuals/addons/r.stream.extract.html) (note this is GRASS 6.4.4 but should be similar for 7.x)

Chris Bartolomei P.E.
Engineer/Scientist
ENSCO, Inc.
4849 North Wickham Road
Melbourne, FL 32940 (official office)
5038 Park Rim Drive
San Diego, CA 92117 (home office)
(858) 581-3005
bartolomei.chris@ensco.com
________________________________________
From: grass-user [grass-user-bounces@lists.osgeo.org] On Behalf Of Jim Maas [j.maas@uea.ac.uk]
Sent: Tuesday, April 26, 2016 6:43 AM
To: Blumentrath, Stefan; grass-user@lists.osgeo.org
Subject: Re: [GRASS-user] simple way to get Easting and Northing coordinates of stream outlet directly from r.watershed?

Hi Stefan,

Thanks for this. I've had a look but not tried it yet. Just for me to
clarify, are you suggesting that:

1. r.stream.basins will somehow produce and output the Easting and
Northing values of the overall outlet?
2. r.stream.basins, will replace most of this workflow and thus the
Eastings and Northings will not be required explicitly?

In the case of 1, I can't quite see how it will output these values?

Thanks a bunch,

J

On 26/04/16 14:02, Blumentrath, Stefan wrote:

Hi,

Did you consider using:
https://urldefense.proofpoint.com/v2/url?u=https-3A__grass.osgeo.org_grass70_manuals_addons_r.stream.basins.html&d=CwIGaQ&c=DsZY2bea7iNIzyp-7sZ0t0F2UfNQZUfZhEPCv_2wBI0&r=O31ltou6ygJL2Y01kQyNJJD2kiILIsbyz2V0Hn4lFUY&m=uLWb19rS_9IrFOaSAkQeNfJ1qv_6HGtvzKSj16TxYN8&s=iQFFPiu77Qwcm1tmAu9f-H9-0rZQOG8HFgkRIUXvgs0&e=
?

Cheers
Stefan

-----Original Message-----
From: grass-user [mailto:grass-user-bounces@lists.osgeo.org] On Behalf Of Jim Maas
Sent: 26. april 2016 14:28
To: grass-user@lists.osgeo.org
Subject: [GRASS-user] simple way to get Easting and Northing coordinates of stream outlet directly from r.watershed?

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
J

--
Dr. Jim Maas
University of East Anglia

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.osgeo.org_mailman_listinfo_grass-2Duser&d=CwIGaQ&c=DsZY2bea7iNIzyp-7sZ0t0F2UfNQZUfZhEPCv_2wBI0&r=O31ltou6ygJL2Y01kQyNJJD2kiILIsbyz2V0Hn4lFUY&m=uLWb19rS_9IrFOaSAkQeNfJ1qv_6HGtvzKSj16TxYN8&s=1QihHldi_jAaJN_Jzs5qtFb-hG4ZZFYRLI7AhntJ1bk&e=

--
Dr. Jim Maas
University of East Anglia

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.osgeo.org_mailman_listinfo_grass-2Duser&d=CwIGaQ&c=DsZY2bea7iNIzyp-7sZ0t0F2UfNQZUfZhEPCv_2wBI0&r=O31ltou6ygJL2Y01kQyNJJD2kiILIsbyz2V0Hn4lFUY&m=uLWb19rS_9IrFOaSAkQeNfJ1qv_6HGtvzKSj16TxYN8&s=1QihHldi_jAaJN_Jzs5qtFb-hG4ZZFYRLI7AhntJ1bk&e=

The information contained in this email message is intended only for the use of the individual(s) to whom it is addressed and may contain information that is privileged and sensitive. If you are not the intended recipient, or otherwise have received this communication in error, please notify the sender immediately by email at the above referenced address and note that any further dissemination, distribution or copying of this communication is strictly prohibited.

The U.S. Export Control Laws regulate the export and re-export of technology originating in the United States. This includes the electronic transmission of information and software to foreign countries and to certain foreign nationals. Recipient agrees to abide by these laws and their regulations -- including the U.S. Department of Commerce Export Administration Regulations and the U.S. Department of State International Traffic in Arms Regulations -- and not to transfer, by electronic transmission or otherwise, any content derived from this email to either a foreign national or a foreign destination in violation of such laws.

Bartolomei.Chris · April 26, 2016, 5:42pm

Jim - one other thought...
If you look at r.stream.distance, you see that internally it finds the stream outlet. Unfortunately it does not report it but if you go into the source python script, you can see how it is calculated and extract that bit of code for your own script. I've done similar translating the python into a POSIX (sh) script (mainly because I suck at python...lol).
Chris

Chris Bartolomei P.E.
Engineer/Scientist
ENSCO, Inc.
bartolomei.chris@ensco.com
________________________________________
From: grass-user [grass-user-bounces@lists.osgeo.org] On Behalf Of Jim Maas [j.maas@uea.ac.uk]
Sent: Tuesday, April 26, 2016 6:43 AM
To: Blumentrath, Stefan; grass-user@lists.osgeo.org
Subject: Re: [GRASS-user] simple way to get Easting and Northing coordinates of stream outlet directly from r.watershed?

Hi Stefan,

Thanks for this. I've had a look but not tried it yet. Just for me to
clarify, are you suggesting that:

1. r.stream.basins will somehow produce and output the Easting and
Northing values of the overall outlet?
2. r.stream.basins, will replace most of this workflow and thus the
Eastings and Northings will not be required explicitly?

In the case of 1, I can't quite see how it will output these values?

Thanks a bunch,

J

On 26/04/16 14:02, Blumentrath, Stefan wrote:

Hi,

Did you consider using:
https://urldefense.proofpoint.com/v2/url?u=https-3A__grass.osgeo.org_grass70_manuals_addons_r.stream.basins.html&d=CwIGaQ&c=DsZY2bea7iNIzyp-7sZ0t0F2UfNQZUfZhEPCv_2wBI0&r=O31ltou6ygJL2Y01kQyNJJD2kiILIsbyz2V0Hn4lFUY&m=uLWb19rS_9IrFOaSAkQeNfJ1qv_6HGtvzKSj16TxYN8&s=iQFFPiu77Qwcm1tmAu9f-H9-0rZQOG8HFgkRIUXvgs0&e=
?

Cheers
Stefan

-----Original Message-----
From: grass-user [mailto:grass-user-bounces@lists.osgeo.org] On Behalf Of Jim Maas
Sent: 26. april 2016 14:28
To: grass-user@lists.osgeo.org
Subject: [GRASS-user] simple way to get Easting and Northing coordinates of stream outlet directly from r.watershed?

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
J

--
Dr. Jim Maas
University of East Anglia

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.osgeo.org_mailman_listinfo_grass-2Duser&d=CwIGaQ&c=DsZY2bea7iNIzyp-7sZ0t0F2UfNQZUfZhEPCv_2wBI0&r=O31ltou6ygJL2Y01kQyNJJD2kiILIsbyz2V0Hn4lFUY&m=uLWb19rS_9IrFOaSAkQeNfJ1qv_6HGtvzKSj16TxYN8&s=1QihHldi_jAaJN_Jzs5qtFb-hG4ZZFYRLI7AhntJ1bk&e=

--
Dr. Jim Maas
University of East Anglia

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.osgeo.org_mailman_listinfo_grass-2Duser&d=CwIGaQ&c=DsZY2bea7iNIzyp-7sZ0t0F2UfNQZUfZhEPCv_2wBI0&r=O31ltou6ygJL2Y01kQyNJJD2kiILIsbyz2V0Hn4lFUY&m=uLWb19rS_9IrFOaSAkQeNfJ1qv_6HGtvzKSj16TxYN8&s=1QihHldi_jAaJN_Jzs5qtFb-hG4ZZFYRLI7AhntJ1bk&e=

The information contained in this email message is intended only for the use of the individual(s) to whom it is addressed and may contain information that is privileged and sensitive. If you are not the intended recipient, or otherwise have received this communication in error, please notify the sender immediately by email at the above referenced address and note that any further dissemination, distribution or copying of this communication is strictly prohibited.

The U.S. Export Control Laws regulate the export and re-export of technology originating in the United States. This includes the electronic transmission of information and software to foreign countries and to certain foreign nationals. Recipient agrees to abide by these laws and their regulations -- including the U.S. Department of Commerce Export Administration Regulations and the U.S. Department of State International Traffic in Arms Regulations -- and not to transfer, by electronic transmission or otherwise, any content derived from this email to either a foreign national or a foreign destination in violation of such laws.

Blumentrath_Stefan1 · April 26, 2016, 9:10pm

Hi Jim,

If I understood you final objective correctly, I would say 2: r.stream.basins, will replace most of your workflow...

With the stream_rast option, r.stream.basisns produces basins using raster input maps with "multiple outlets".
You can feed this option either with a raster map of your whole stream (which naturally covers the outlet) or even specify categories of the streams you want to get the basisns for. Citing from the manual:

To delineate one or more particular basins defined by given streams, add simply stream categories:
r.stream.basins -lc direction=direction stream_rast=streams cats=2,7,184 basins=bas_basin

See also: https://grasswiki.osgeo.org/wiki/R.stream.*_modules and of course the related scientific paper: http://www.sciencedirect.com/science/article/pii/S0098300411000975

Hope that helps.

Cheers
Stefan

-----Original Message-----
From: Jim Maas [mailto:j.maas@uea.ac.uk]
Sent: 26. april 2016 15:44
To: Blumentrath, Stefan <Stefan.Blumentrath@nina.no>; grass-user@lists.osgeo.org
Subject: Re: [GRASS-user] simple way to get Easting and Northing coordinates of stream outlet directly from r.watershed?

Hi Stefan,

Thanks for this. I've had a look but not tried it yet. Just for me to clarify, are you suggesting that:

1. r.stream.basins will somehow produce and output the Easting and
Northing values of the overall outlet?
2. r.stream.basins, will replace most of this workflow and thus the
Eastings and Northings will not be required explicitly?

In the case of 1, I can't quite see how it will output these values?

Thanks a bunch,

J

On 26/04/16 14:02, Blumentrath, Stefan wrote:

Hi,

Did you consider using:
https://grass.osgeo.org/grass70/manuals/addons/r.stream.basins.html
?

Cheers
Stefan

-----Original Message-----
From: grass-user [mailto:grass-user-bounces@lists.osgeo.org] On Behalf
Of Jim Maas
Sent: 26. april 2016 14:28
To: grass-user@lists.osgeo.org
Subject: [GRASS-user] simple way to get Easting and Northing coordinates of stream outlet directly from r.watershed?

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
J

--
Dr. Jim Maas
University of East Anglia

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

--
Dr. Jim Maas
University of East Anglia

James_Maas_MED · April 27, 2016, 6:37am

Thanks Stefan,

I guess I should have mentioned, the whole point of all this work is to get the appropriate input data, including the topidx map required to run topmodel for a two year period, on very small catchments (25km^2 ). I can run either the GRASS or R version of topmodel, but it appears that the R version is better equipped to do sensitivity analysis, i.e. pass it a parameters file with multiple lines of parameters, through which it will iterate and do the sensitivity analysis. I'm assuming this doesn't change your advice?

Thanks

J

On 26/04/16 22:10, Blumentrath, Stefan wrote:

Hi Jim,

If I understood you final objective correctly, I would say 2: r.stream.basins, will replace most of your workflow...

With the stream_rast option, r.stream.basisns produces basins using raster input maps with "multiple outlets".
You can feed this option either with a raster map of your whole stream (which naturally covers the outlet) or even specify categories of the streams you want to get the basisns for. Citing from the manual:

To delineate one or more particular basins defined by given streams, add simply stream categories:
r.stream.basins -lc direction=direction stream_rast=streams cats=2,7,184 basins=bas_basin

See also: https://grasswiki.osgeo.org/wiki/R.stream.*_modules and of course the related scientific paper: http://www.sciencedirect.com/science/article/pii/S0098300411000975

Hope that helps.

Cheers
Stefan

-----Original Message-----
From: Jim Maas [mailto:j.maas@uea.ac.uk]
Sent: 26. april 2016 15:44
To: Blumentrath, Stefan <Stefan.Blumentrath@nina.no>; grass-user@lists.osgeo.org
Subject: Re: [GRASS-user] simple way to get Easting and Northing coordinates of stream outlet directly from r.watershed?

Hi Stefan,

Thanks for this. I've had a look but not tried it yet. Just for me to clarify, are you suggesting that:

  1. r.stream.basins will somehow produce and output the Easting and
     Northing values of the overall outlet?
  2. r.stream.basins, will replace most of this workflow and thus the
     Eastings and Northings will not be required explicitly?

In the case of 1, I can't quite see how it will output these values?

Thanks a bunch,

J

On 26/04/16 14:02, Blumentrath, Stefan wrote:

Hi,

Did you consider using:
https://grass.osgeo.org/grass70/manuals/addons/r.stream.basins.html
?

Cheers
Stefan

-----Original Message-----
From: grass-user [mailto:grass-user-bounces@lists.osgeo.org] On Behalf
Of Jim Maas
Sent: 26. april 2016 14:28
To: grass-user@lists.osgeo.org
Subject: [GRASS-user] simple way to get Easting and Northing coordinates of stream outlet directly from r.watershed?

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
J

--
Dr. Jim Maas
University of East Anglia

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

--
Dr. Jim Maas
University of East Anglia

--
Dr. Jim Maas
Mathematical Modelling in
Epidemiology of Infectious Disease
Rm 2.13 MED
Norwich Medical School
University of East Anglia
Norwich Research Park,
NR4 7TJ U.K.

E: j.maas@uea.ac.uk