[GRASS-user] announcement of strahler stream order analysis

[Milton Cezar Ribeiro]

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>

> 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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> grass-user at lists.osgeo.org
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>
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