[GRASS-user] announcement of strahler stream order analysis

[Milton Cezar Ribeiro]

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
> _________________
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