2

I have install QGIS 2.18.11 via OSGEO4W 64 bit (that programs and versions install with QGIS SAGA version 2.3.2 GRASS version 7.2.1). I can use SAGA algorithms without problem in QGIS using processing toolbar but not all algorithms from this SAGA version. If I use SAGA stand-alone, I can use the terrain analysis Slope Stability toolbar. That toolbar has six SAGA algorithms.

Why are algorithms from this toolbar missing from the Processing toolbox?

Is it possible to add these algorithms manually?

Improve this question

1 Answer 1

Reset to default
1

It is not a problem in the installation of QGIS 2.18.11 and version 2.3.2 on your machine, but actually not all SAGA tools existing in SAGA standalone program are integrated in QGIS SAGA processing tools. There are many tools in SAGA standalone program such as slope stability (completely not included), Lighting (3 tools in QGIS, but 7 tools in SAGA software), and many others which are very useful and not integrated in QGIS processing tools.

Maybe it is not a convenient way, but the easiest route you can follow is to work with both software to get the results you want. This is the way I do if I need to work with a SAGA tool that does not exist in QGIS processing toolbox.

Integrating all SAGA tools in QGIS may require to do some python programming as there is a python wrapper located in C:\Program Files\QGIS2.18\apps\qgis\python\plugins\processing\algs\saga if you download the QGIS installer (thanks to AndreJ for pointing that), or in C:\OSGeo4W64\apps\qgis\python\plugins\processing\algs\saga if you download QGIS from OSGeo4W. Therefore, it will be a lengthy process if you want to do it by yourself.

Improve this answer
6
  • 1
    Are you sure about the C++ programming? As far as I know, the wrappers in C:\Program Files\QGIS 2.18\apps\qgis\python\plugins\processing\algs\saga are written in Python.
    – AndreJ
    Commented Oct 23, 2017 at 6:12
  • @AndreJ thanks for your comment. I am not sure about C++, but if there is a wrapper for python that can integrate additional SAGA tool, I think it will be easier. Anyway, I will update my answer.
    – ahmadhanb
    Commented Oct 23, 2017 at 6:45
  • @ahmadhanb I use pyqgis I have built some plugins but your details is wrong if I print processing.alglist() then I don't get names of this algorithms where I want
    – jessie jes
    Commented Oct 23, 2017 at 18:32
  • @jessiejes my details are not wrong. When you use print processing.alglist() you actually print what exists in the processing toolbox, and since the tool that you want does not exist, you do not get anything. I am saying that the python wrapper may help you to write your own script to include additional SAGA tools into processing toolbox. However, I am not sure if that can work either. There might be some reasons why OSGeo4W team did not add all tools of SAGA into processing toolbox, which I do not have knowledge about.
    – ahmadhanb
    Commented Oct 24, 2017 at 3:22
  • @ahmadhanb ok sorry I understand,can you tell how to fix that using python ?you have some idea ?
    – jessie jes
    Commented Oct 26, 2017 at 9:45

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.