stream network extraction

[Markus Metz-2]

Hi all,

in grass-addons is a new module for clean stream network extraction from
flow accumulation. It can extract streams from accumulation maps
generated with any method (D8, FD8, D-Inf, DEMON, etc) and any software,
granted that exactly the same elevation map is provided that was used to
calculate flow accumulation. In case of r.terraflow, that would be the
flooded (filled) output elevation map, not the elevation map used as
input for r.terraflow. For e.g. TAS flow accumulation as input, it must
be the elevation map used within TAS to calculate flow accumulation.

r.stream.extract output is available as raster and vector with unique
stream IDs. The vector is a complete network with stream segments and
points for stream heads, confluences and outlets. The raster output can
be used as input for the r.stream.* modules of Jarek, also in grass-addons.

Regards,

Markus M
_______________________________________________
grass-user mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/grass-user

[achim]

Hi Markus,

That is what was missing in stream-network analyzes!

Great to have this! I didnt have a deeper look yet, but I will test and
probably enjoy the script (in fast C-code).

Thank you for that!
Achim



Markus Metz schrieb:

> Hi all,
>
> in grass-addons is a new module for clean stream network extraction from
> flow accumulation. It can extract streams from accumulation maps
> generated with any method (D8, FD8, D-Inf, DEMON, etc) and any software,
> granted that exactly the same elevation map is provided that was used to
> calculate flow accumulation. In case of r.terraflow, that would be the
> flooded (filled) output elevation map, not the elevation map used as
> input for r.terraflow. For e.g. TAS flow accumulation as input, it must
> be the elevation map used within TAS to calculate flow accumulation.
>
> r.stream.extract output is available as raster and vector with unique
> stream IDs. The vector is a complete network with stream segments and
> points for stream heads, confluences and outlets. The raster output can
> be used as input for the r.stream.* modules of Jarek, also in grass-addons.
>
> Regards,
>
> Markus M
> _______________________________________________
> grass-user mailing list
> [hidden email]
> http://lists.osgeo.org/mailman/listinfo/grass-user

_______________________________________________
grass-user mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/grass-user

[Jarosław Jasiewicz]

Markus Metz pisze:

> Hi all,
>
> in grass-addons is a new module for clean stream network extraction
> from flow accumulation. It can extract streams from accumulation maps
> generated with any method (D8, FD8, D-Inf, DEMON, etc) and any
> software, granted that exactly the same elevation map is provided that
> was used to calculate flow accumulation. In case of r.terraflow, that
> would be the flooded (filled) output elevation map, not the elevation
> map used as input for r.terraflow. For e.g. TAS flow accumulation as
> input, it must be the elevation map used within TAS to calculate flow
> accumulation.
>
> r.stream.extract output is available as raster and vector with unique
> stream IDs. The vector is a complete network with stream segments and
> points for stream heads, confluences and outlets. The raster output
> can be used as input for the r.stream.* modules of Jarek, also in
> grass-addons.
>
> Regards,
>
> Markus M
> _______________________________________________
> grass-user mailing list
> [hidden email]
> http://lists.osgeo.org/mailman/listinfo/grass-user

Hi Markus, Hi all.

rest of r.stream* modules including new r.stream.stats for Hortonian
statistics are now available by grass addons page and by grass add-ons
svn repository. I actually move tutorial on r.stream* to grass wiki page.

Jarek
_______________________________________________
grass-user mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/grass-user

[achim]

Hi all,

I have a problem reclassing a vector of polygons:

I have areas with unique cats and a column "value" as integer.
I want to reclass from column "value"
and ->here is the problem:
keep the value information to identify the areas.

In the manual it says:
No table is created for reclassed layer if column option is used and
column type is integer (there is nothing which could be written to the
table).

But couldn't be there a table with value-integer as cat?

So how can I identify areas with the "value"?

Thanks,
Achim

PS:
workaround would be:
v.to.rast with old values
update centros of reclassed map from that raster map
-> but it seems a bit in-elegant..

_______________________________________________
grass-user mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/grass-user

[achim]

> PS:
> workaround would be:
> v.to.rast with old values
> update centros of reclassed map from that raster map
> -> but it seems a bit in-elegant..
...and which is a bit complicated as centroids cannot be used in
v.what.rast...
...and conversion into points produces more than one point for some
centroids (where one cat has more than two separate areas), so
v.what.rast produces NULLs here...

-so the workaround isn't one-
_______________________________________________
grass-user mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/grass-user

[Markus Metz-2]

Jarosław Jasiewicz wrote:
>
> rest of r.stream* modules including new r.stream.stats for Hortonian
> statistics are now available by grass addons page and by grass add-ons
> svn repository. I actually move tutorial on r.stream* to grass wiki page.
Great, IMHO the tutorials on your website are very helpful and show
nicely all the various results the new r.stream.* modules can produce.
Maybe a link to the wiki page can be added to the manuals?

Markus M
_______________________________________________
grass-user mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/grass-user

[Jarosław Jasiewicz]

Markus Metz pisze:

>
> Jarosław Jasiewicz wrote:
>>
>> rest of r.stream* modules including new r.stream.stats for Hortonian
>> statistics are now available by grass addons page and by grass
>> add-ons svn repository. I actually move tutorial on r.stream* to
>> grass wiki page.
> Great, IMHO the tutorials on your website are very helpful and show
> nicely all the various results the new r.stream.* modules can produce.
> Maybe a link to the wiki page can be added to the manuals?
>
> Markus M

Will be,
Jarek
_______________________________________________
grass-user mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/grass-user

[achim]

Well, I really stuck here:

I havent found anything about playing with the common geom multipolygon
in GRASS. I think that is what I need and what I thought I could handle
with v.reclass. But it does not work.

-Is there something in GRASS to create multipolygons?
-Do they have one centroid or multiple with the same cat (as I thought)

Any suggestions are very welcome
achim

achim schrieb:

>> PS:
>> workaround would be:
>> v.to.rast with old values
>> update centros of reclassed map from that raster map
>> -> but it seems a bit in-elegant..
> ...and which is a bit complicated as centroids cannot be used in
> v.what.rast...
> ...and conversion into points produces more than one point for some
> centroids (where one cat has more than two separate areas), so
> v.what.rast produces NULLs here...
>
> -so the workaround isn't one-
> _______________________________________________
> grass-user mailing list
> [hidden email]
> http://lists.osgeo.org/mailman/listinfo/grass-user

_______________________________________________
grass-user mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/grass-user

[Annalisa Minelli]

Hi Markus, hi all,
I'm trying to compilate the code of r.stream.extract (from addOns) but when I run "make" command it gives me this error:

annalisa@annalisa-laptop:~/grass_dev64/raster/r.stream.extract$ sudo make
test -d OBJ.i686-pc-linux-gnu || mkdir -p OBJ.i686-pc-linux-gnu
gcc -I/home/annalisa/grass_dev64/dist.i686-pc-linux-gnu/include  -g -Wall    -I/usr/local/include    -DPACKAGE=\""grassmods"\"  -I/home/annalisa/grass_dev64/dist.i686-pc-linux-gnu/include -o OBJ.i686-pc-linux-gnu/close.o -c close.c
close.c: In function ‘close_streamvect’:
close.c:33: warning: format not a string literal and no format arguments
close.c:152: warning: format not a string literal and no format arguments
close.c:184: warning: format not a string literal and no format arguments
close.c:210: warning: format not a string literal and no format arguments
close.c:218: warning: format not a string literal and no format arguments
close.c:221: error: too few arguments to function ‘Vect_build’
close.c: In function ‘close_maps’:
close.c:242: warning: format not a string literal and no format arguments
make: *** [OBJ.i686-pc-linux-gnu/close.o] Error 1

"close.c:221: error: too few arguments to function ‘Vect_build’"
Where am I going wrong?

thanks

Anna

2009/9/23 Jarosław Jasiewicz <[hidden email]>

Markus Metz pisze:

Jarosław Jasiewicz wrote:

rest of r.stream* modules including new r.stream.stats for Hortonian statistics are now available by grass addons page and by grass add-ons svn repository. I actually move tutorial on r.stream* to grass wiki page.

Great, IMHO the tutorials on your website are very helpful and show nicely all the various results the new r.stream.* modules can produce. Maybe a link to the wiki page can be added to the manuals?

Markus M

Will be,
Jarek

_______________________________________________
grass-user mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/grass-user

_______________________________________________
grass-user mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/grass-user

[Martin Landa]

Hi,

2009/9/24 annagrass6 <[hidden email]>:

> Hi Markus, hi all,
> I'm trying to compilate the code of r.stream.extract (from addOns) but when
> I run "make" command it gives me this error:
>
> annalisa@annalisa-laptop:~/grass_dev64/raster/r.stream.extract$ sudo make
> test -d OBJ.i686-pc-linux-gnu || mkdir -p OBJ.i686-pc-linux-gnu
> gcc -I/home/annalisa/grass_dev64/dist.i686-pc-linux-gnu/include  -g -Wall
> -I/usr/local/include    -DPACKAGE=\""grassmods"\"
> -I/home/annalisa/grass_dev64/dist.i686-pc-linux-gnu/include -o
> OBJ.i686-pc-linux-gnu/close.o -c close.c
> close.c: In function ‘close_streamvect’:
> close.c:33: warning: format not a string literal and no format arguments
> close.c:152: warning: format not a string literal and no format arguments
> close.c:184: warning: format not a string literal and no format arguments
> close.c:210: warning: format not a string literal and no format arguments
> close.c:218: warning: format not a string literal and no format arguments
> close.c:221: error: too few arguments to function ‘Vect_build’
> close.c: In function ‘close_maps’:
> close.c:242: warning: format not a string literal and no format arguments
> make: *** [OBJ.i686-pc-linux-gnu/close.o] Error 1
>
> "close.c:221: error: too few arguments to function ‘Vect_build’"
> Where am I going wrong?

update your GRASS. In r34288 was eliminate non-standard logging
mechanism, currently Vect_build() takes only one argument - pointer to
Map_info structure.

Martin

--
Martin Landa <landa.martin gmail.com> * http://gama.fsv.cvut.cz/~landa
_______________________________________________
grass-user mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/grass-user

[margherita]

Thank you for your work, Markus, it's wonderful :)

Best,

Margherita

Hi all,

in grass-addons is a new module for clean stream network extraction from
flow accumulation. It can extract streams from accumulation maps
generated with any method (D8, FD8, D-Inf, DEMON, etc) and any software,
granted that exactly the same elevation map is provided that was used to
calculate flow accumulation. In case of r.terraflow, that would be the
flooded (filled) output elevation map, not the elevation map used as
input for r.terraflow. For e.g. TAS flow accumulation as input, it must
be the elevation map used within TAS to calculate flow accumulation.

r.stream.extract output is available as raster and vector with unique
stream IDs. The vector is a complete network with stream segments and
points for stream heads, confluences and outlets. The raster output can
be used as input for the r.stream.* modules of Jarek, also in grass-addons.

Regards,

Markus M

_______________________________________________
grass-user mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/grass-user