Ok Victor<div>I read the grass.txt description and one thing isn't clear to me.</div><div>If I add a "description.txt" to the description folder in \sextante\grass\ then the module described there is automatically loaded among sextante algorithms?</div>
<div><br></div><div>Controlling and editing description files, as described in grass.txt file, doesn't seem to be a difficult task for a rookie like me..</div><div>So I can modify them in case they don't work as expected, test them and ask you if it's the case to upload via svn. Is that ok for you?</div>
<div><br></div><div>Thanks again</div><div>Pietro</div><div><br><div class="gmail_quote">2012/5/10 Victor Olaya-3 [via OSGeo.org] <span dir="ltr"><<a href="/user/SendEmail.jtp?type=node&node=4967897&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">
> This module don't start if you don't have a raster in the Qgis TOC with an
<br>> error like "Wrong or missing parameter values". This raster is required if
<br>> you want a mask layer to be used but not always is the case and grass let
<br>> you decide if use it or not.
<br><br>> Then
<br>> I only made some test with a raster used as mask but the module don't load
<br>> output layers because of some cross validation problems..
<br>> All these parameters seem to be optional in Grass but I think that sextante
<br>> consider them obligatory.
<br><br></div><div class="im">I have just made the layer optional and uploaded the new description
<br>to the SVN. Note that if you find errors like that, you can modify the
<br>description of GRASS algorithms yourself and help us improve the
<br>SEXTANTE-GRASS link. Read this to know how to do it:
<br><br><a href="http://sextante.googlecode.com/svn/trunk/soft/bindings/qgis-plugin/src/sextante/grass/grass.txt" rel="nofollow" link="external" target="_blank">http://sextante.googlecode.com/svn/trunk/soft/bindings/qgis-plugin/src/sextante/grass/grass.txt</a><br>
<br><br></div><div class="im">> Then
<br>> Grass module let you choose if you want to use layer 0 (i.e. 3D vector) or
<br>> layer n (1 i.e. z column). In sextante it is assumed that you use layer 1
<br>> and of course you have to specify z column name.
<br><br></div><div class="im">Do QGIS support 3D vector? I was not sure about that, so I assumed
<br>that most likely for most users, z values would be in a separate field
<br><br></div><div class="im">> Then
<br>> In Grass there are 10 output files, 6 raster and 4 vectorial and you can
<br>> choose if you want them or not - at least one (in my case elev).
<br>> Sextante elaborate each one of them (If I'm not wrong) and then let you
<br>> choose if you want to add to the TOC.
<br>> Would it be better if you can choose which one to elaborate (could be time
<br>> spending) and then if you want to add it to the TOC?
<br><br></div><div class="im">That would be easy to do for the toolbox...but very hard for the
<br>modeler :-( The modeler needs a well-defined sematic of the algorithm.
<br>If the number or outputs depends on the user...that makes things
<br>really hard to control...which means more work on the developer side.
<br>I have decided to first strive for a robust modeler, which means taht
<br>algorithms are more restricted (or, if they are not restricted, they
<br>can be left out of the modeler, but I think in this case it is worth
<br>to have that process available in the modeler)
<br><br>By now, the only solution is to not load layers, which is just a
<br>cosmetic trick, but does not add extra performance if a layer is not
<br>added, because is generated anyway
<br><br></div><div class="im">> And, if you don't specify the name the layer is given a number as name, but
<br>> it could be confusing if you let sextante work on more output than one more
<br>> without specify each name.. So may be it would be better to concatenate a
<br>> random number with the parameter name?
<br><br></div><div class="im">If you want names instead of filenames (those number are a temporary
<br>filename), you can set it in the general settings, unckecking the "use
<br>filename as layer name" box. Doing that, it will use the output name
<br>(in this case, the GRASS output name)
<br><br></div><div class="im">> At the end I couldn't obtain any output, I attach some logs
<br><br></div><div class="im">should work now. Please, check the SVN version. There are now two
<br>algorithms, one for the interpolation and one for the cross validation
<br>(v.surf.rst.cvdev). I have, however, removed the "devi" output, since
<br>it blocks grass when i use it... I have also removed the derived
<br>outputs (slope, etc), to keep things more simple. All those can later
<br>be extracted with another algorithm in SEXTNATE.
<br><br>As I said, there is much work to do in polishing algorithm
<br>descriptions. It is easy, but boring...so we are slowly advancing and
<br>hopefully will soon have SEXTANTE working fine with all these external
<br>applications.
<br><br>Regards
<br></div><div class="im">_______________________________________________
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