<div dir="auto"><div dir="auto"><a href="https://github.com/qgis/QGIS/issues/40260#issuecomment-733932354">https://github.com/qgis/QGIS/issues/40260#issuecomment-733932354</a><br></div><div dir="auto"><br></div><div dir="auto">Riporto quanto consigliato da Nyall Dawson a proposito della scelta dei moduli in qgis.</div><div dir="auto"><br></div><div dir="auto">"Whenever I'm teaching qgis I always recommend that users pick algorithms in this order:</div><div dir="auto"><br></div><div dir="auto">Qgis native provider: it's the most actively maintained and will work with ALL layer sources supported by qgis, also has nice functionality like saving results directly into existing geopackages, postgres database, etc, and the ability to "data define" parameters values so that they vary feature by feature. Also very fast, and no loss of attributes/quality caused by conversion to intermediate formats.</div><div dir="auto"><br></div><div dir="auto">Gdal: a fantastic choice for any raster operations. Algorithms are super robust and extremely well tested, and heavily optimised for speed.</div><div dir="auto"><br></div><div dir="auto">Grass: algorithms are extremely robust and mature, but very difficult to learn and suffer from a confusing mash of options. You definitely need to read the manual before using a tool. Also can be quite slow due to forced conversion the grass data types, which can also cause loss/modification of attribute information. But on the plus side, an absolute ton of functionality which isn't available elsewhere.</div><div dir="auto"><br></div><div dir="auto">Saga. Use as an absolute last resort. Don't touch the vector algorithms as all have better alternatives in the other providers. Badly tested, frequently breaks, and unfortunately also often outputs incorrect results. Use only when there's no other alternative, and make sure you perform your own qa on the results to verify that the tool is indeed working as advertised.</div><div dir="auto"><br></div><div dir="auto">That's my 2c at least, but it's based on my years of experience in using and maintaining (and developing) these tools."</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Il mar 24 nov 2020, 22:57 Stefano Campus <<a href="mailto:skampus@gmail.com">skampus@gmail.com</a>> ha scritto:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">ciao a tutti,<br>
come ben sapete data la pessima abitudine degli sviluppatori di SAGA di<br>
cambiare senza preavviso, al momento la versione standard di SAGA supportata<br>
in Processing è la versione ltr 2.3.<br>
Tuttavia nel corso degli ultimi mesi ci sono vari tentativi di integrare in<br>
processing anche le ultime versioni di saga 7.x.<br>
attraverso un plugin di alexander bruy, non più presente nel suo repository<br>
[1] (c'è comunque il plugin per utilizzare in Processing gli altrettanto<br>
validi moduli di Whitebox GIS) ed ora un plugin di northroad sul repo<br>
ufficiale (Processing Saga NextGen Provider), è possibile, appunto,<br>
utilizzare le ultime versioni di SAGA.<br>
<br>
oggi invece scaricando la versione GUI di SAGA per windows nel repo di<br>
Sourceforge [2] ho scoperto che pare che direttamente si possa utilizzare<br>
SAGA in Processing senza plugin terzi.<br>
<br>
purtroppo, come spesso succede per la documentazione di SAGA non ho mica<br>
capito quale sia la procedura sinteticamente illustrata nel readme.txt.<br>
<br>
chiedo dunque a qualcuno se può cortesemente dare un'occhiata al contenuto<br>
del file saga4qgis.zip contenuto nel pacchetto [2] e mi può dare una propria<br>
interpretazione della procedura. <br>
<br>
grazie mille<br>
<br>
s.<br>
<br>
[1] <a href="https://plugins.bruy.me/plugins/plugins.xml" rel="noreferrer noreferrer" target="_blank">https://plugins.bruy.me/plugins/plugins.xml</a><br>
[2]<br>
<a href="https://sourceforge.net/projects/saga-gis/files/SAGA%20-%207/SAGA%20-%207.8.1/saga-7.8.1_x64.zip/download" rel="noreferrer noreferrer" target="_blank">https://sourceforge.net/projects/saga-gis/files/SAGA%20-%207/SAGA%20-%207.8.1/saga-7.8.1_x64.zip/download</a><br>
<br>
<br>
<br>
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</blockquote></div>