[GRASS-user] announcement of strahler stream order analysis
Milton Cezar Ribeiro
miltinho.astronauta at gmail.com
Tue Jul 28 12:14:07 EDT 2009
2009/7/28 Carlos Grohmann <carlos.grohmann at gmail.com>
> Just tested in a LatLong region. works fine.
> 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
> >> _______________________________________________
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> Carlos Henrique Grohmann - Geologist D.Sc.
> a.k.a. Guano - Linux User #89721
> ResearcherID: A-9030-2008
> Can’t stop the signal.
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