[GRASS-user] announcement of strahler stream order analysis

[stephen sefick]

First, if I haven't said this yet, wonderful job.  Is there a way to
extract things like total lengths of streams from the raster.  Like
length of stream order 1, 2, etc., so that percentage of occurrence
could be calculated- length order1/length total?  On an unrelated note
I added this package to the raster set in the source and recompiled on
Mac.  I have lost the ability to use the python GUI.  I am having a
hard time figuring out how to do this.  Should I reinstall the Binary
version, add r.streams to the add on packages, or is there a simpler
way to add a flag in the ./configure argument?
Thanks,

Stephen Sefick

On Tue, Jul 28, 2009 at 11:14 AM, Milton Cezar
Ribeiro<miltinho.astronauta at gmail.com> wrote:
> Thanks Carlos!!
>
> milton
>
> 2009/7/28 Carlos Grohmann <carlos.grohmann at gmail.com>
>>
>> Just tested in a LatLong region. works fine.
>>
>> Carlos
>>
>>
>>
>>
>>
>> 2009/7/28 Jarek Jasiewicz <jarekj at amu.edu.pl>:
>> > try, I don't know I haven't  LL location to test it
>> > but it shoud work
>> > program do not use any inforamtuon about units and units conversion
>> >
>> > Jarek
>> >
>> > Milton Cezar Ribeiro pisze:
>> >>
>> >> Hi Jarek
>> >>
>> >> Can use this on a LatLong mapset where my unit is not meters?
>> >> Thanks for the effort!
>> >>
>> >> milton
>> >>
>> >> 2009/7/26 Jarek Jasiewicz <jarekj at amu.edu.pl
>> >> <mailto:jarekj at amu.edu.pl>>
>> >>
>> >>    Hi list!
>> >>
>> >>    I just finish first version of new grass module r.stream. Module
>> >>    is regular Grass module, written in C an has no addational
>> >>    dependencies. It was compiled with GRASS65 devel  downloaded in
>> >>    last  two week. Source code you can find here:
>> >>
>> >>    http://heretic.livenet.pl/heretic/r.stream.tar.gz
>> >>
>> >>    Module compiles and seems to work. Analysis was tested only on one
>> >>    dataset.
>> >>
>> >>    To compile it copy r.streams directory to your grassXX../raster/
>> >>     cd r.stream run make and make install
>> >>
>> >>    What module calculate:
>> >>    - strahler stream order
>> >>    - shreeve stream magnitude
>> >>    - class of topological elements of drainage networks
>> >>
>> >>    Module use r.watershed outputs: SDF flow direction and SDF stream
>> >>    network.
>> >>
>> >>
>> >>    Analysis of r.stream shall be run on same regions setings as
>> >>    r.watershed. If no, run g.region rast=your_dir_file first. For now
>> >>    module do not check if region and rasters are identical. It is
>> >>    planned to add in nearest feature. It also do not check if dirs
>> >>    and streams are SDF result. Threre are no addational description.
>> >>    It will be added after testing.
>> >>
>> >>    It works only on cells data. Floating points data are not allowed
>> >>    (and have no sense).
>> >>
>> >>    Module is quite fast. 3000 x3000 cells all three analysis runs no
>> >>    more than 30 s. on AMD 3800 2GB, Ubuntu 8.04
>> >>
>> >>    Module is part of comprehensive project which will add full Horton
>> >>    analysis and some addational terrrains analysis to Grass. More
>> >>    details in the feature. Any cooperation is welcome. The next
>> >>    module I plan is directional vectorisation of stream network.
>> >>
>> >>    For now module is available only form web address pointed below.
>> >>    After testing and removing critical errors it will be added to
>> >>    grass add-ons (or maybe to main branch?).
>> >>
>> >>    Any coments, improvements and critics is very welcome.
>> >>
>> >>    More advanced Grass developers: Please check my code. Its funny,
>> >>    but I don't know C.
>> >>    General code is based on GRASS r.topindex module (by Keith Beven
>> >>    and Huidae Cho, strongly modified)
>> >>    Strahler stream order algorithm from Saga GIS (by Victor Olaya,
>> >>    modified)
>> >>    Shreeve stream magnitude and class of topological network are my
>> >>    own ideas
>> >>
>> >>    Test and enjoy.
>> >>
>> >>    Jarek Jasiewicz
>> >>    Adam Mickiewicz University, Poznan
>> >>    Geoecology and Geoinformation Institute
>> >>    _______________________________________________
>> >>    grass-user mailing list
>> >>    grass-user at lists.osgeo.org <mailto:grass-user at lists.osgeo.org>
>> >>    http://lists.osgeo.org/mailman/listinfo/grass-user
>> >>
>> >>
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>>
>>
>>
>> --
>> Carlos Henrique Grohmann - Geologist D.Sc.
>> a.k.a. Guano - Linux User #89721
>> ResearcherID: A-9030-2008
>>
>> http://digitalelevation.blogspot.com
>>
>> http://www.igc.usp.br/pessoais/guano
>> _________________
>> Can’t stop the signal.
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-- 
Stephen Sefick

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods.  We are mammals, and have not exhausted the
annoying little problems of being mammals.

								-K. Mullis