[Qgis-user] qgis and saga (future) integration hypothesis

[G. Allegri]

> SAGA has a very optimized code (about 10% disk space of a GRASS
> install), is very fast and is designed specifically to
> terrain/hydrology analysis, instead of being a general-purpose GIS
> like GRASS.


Well, SAGA is quite general porpuse too, through various low level modules
for vector and grid management.
I add that it has geostatistical analysis tools, imagery classification,
various algorithms for simulations (like genetic algorithms), etc.





>
> On Sat, Jul 11, 2009 at 10:36, G. Allegri<giohappy at gmail.com> wrote:
> > Hi Paolo.
> > SAGA community is apprently small. The dev team is small, but they work
> > hard, even if it doesn't appear from the SAGA site.
> > I've just chatted with its major developer (Volker) and he was asking
> help
> > to mantain the build chain updated and give a refresh to the site (wiki
> is a
> > bit outdated, etc.). The latest version build binary is not available,
> but
> > there's a quite new snapshot at Laserdata [1], where some of its
> developers
> > work.
> >
> > I said the community is large, even if its not so noticeable. I have many
> > collegues that use it (more then GRASS), also through the very good RSAGA
> > interface for R [2]. Tomislav Hengl has lot of material about this [3]
> >
> > Why I'm so much interested in SAGA:
> >
> > I find it has all the features to make lot of (vectorial, grid and
> imagery)
> > analysis and automation. It includes functions that GRASS doesn't offer
> out
> > of the box, that you can find (partly) in the latter user manual (a
> litlle
> > bit outdated) [4].
> > I don't have time in this moment to list all the differences between it
> anf
> > GRASS, and please don't misunderstand me: I love GRASS, and will continue
> > using it too... but:
> >
> >  1 - the GRASS Windows version situation is a major problem, while SAGA
> > works smooth both on Windows and Linux. I don't know which version you
> used,
> > I haven't tried the linux version yet, but I don't see bad feedbacks in
> the
> > resent ML posts.
> >
> > 2 - It doesn't need to be installed: I use it from my pen drive :)
> >
> > 3 - It doesn't work with topology. Yes, it can be seen as a missing,
> > important, feature for someone and for some uses, but the end users often
> > prefer to work directly on shapefiles, without the overhead of
> clean/build
> > issues during GRASS imports... And that's one of the points that make
> QGIS,
> > Gvsig, etc. more usable.
> >
> > 4 - The latest version (that I'm going to buid), links well with the the
> > latest libraries (GDAL, PROJ) and Python 2.5.
> >
> > 5 - While the GRASS dev team is putting much effort in the GUI
> development,
> > SAGA GUI is a bit secondary. It would gain great benefit from an
> integration
> > with QGIS...
> >
> > Ok, this is just my personal, subjective, overview. But I repeat I don't
> > wnat to discourage GRASS usage, but to highlight this good alternative...
> >
> > Giovanni
> >
> > [1] http://www.laserdata.at/saga_packages.html
> > [2] http://cran.r-project.org/web/packages/RSAGA/index.html
> > [3] http://spatial-analyst.net/wiki/index.php?search=rsaga&go=Go
> > [4]
> >
> http://garr.dl.sourceforge.net/sourceforge/saga-gis/SAGA2_UserGuide_Cimmery_20070401.pdf
> >
> > 2009/7/11 Paolo Cavallini <cavallini at faunalia.it>
> >>
> >> G. Allegri ha scritto:
> >> > SAGA algorithms were the basis on which Sextentegis was developed.
> Then
> >> > this was integrated into Gvsig... Why don't make happen the same for
> >> > SAGA? :)
> >>
> >> Hi Giovanni.
> >> I have tested saga a few years ago, and I was rather disappointed by its
> >> (lack of) stability on Linux. Also, the apparently very small community
> >> was a bit worrisome to me. More generally, I do not understand well what
> >> is the advantage of using saga rather than grass: have you checked their
> >> different strengths and weak points?
> >> Thanks a lot.
> >> --
> >> Paolo Cavallini: http://www.faunalia.it/pc
> >> _______________________________________________
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> >> http://lists.osgeo.org/mailman/listinfo/qgis-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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