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I am using QGIS 3.4.2-Madeira. It has GRASS 7 as a core plugin.

In QGIS, when I open Processing Toolbox, I can see the GRASS option but under the imagery sub-menu, I cannot find the i.ortho.rectify module.

My Processing Toolbox

Missing <code>i.ortho.rectify</code>

I am also unable to add a new mapset since my GRASS toolbar doesn't show all the options as told in this QGIS tutorial. It only shows Open GRASS Tools option which upon clicking opens the GRASS Tools as seen in the lower half of both of the attached images.

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Did you install everything cleanly using OSGEO4W?

This module is also on my QGIS but the executable is present in the GRASS folder of QGIS.

C:\Program Files\QGIS 3.4\apps\grass76\bin

You could try using the command line executable. The syntax is as follows: https://grass.osgeo.org/grass76/manuals/i.ortho.rectify.html

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  • I am on Ubuntu. You're somewhat right. I searched for i.ortho.rectifyon my system and I got it in /usr/lib/grass74/bin/path/. However, the path of the GRASS plugin which my QGIS is using is different from this - /usr/lib/qgis/plugins/. So from what I understand, the required module is on my system but QGIS is fetching plugins from somewhere else. How do I solve this? – Nancy Dec 23 '19 at 8:46
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    For plugin GRASS, there are two different folders : one for the installation of GRASS and another for the modules. Have you try to reinstall with OSGeo4W ? – Vincent Bré Dec 23 '19 at 8:57
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    There are many error messages, the best is to reinstall – Vincent Bré Dec 23 '19 at 9:04
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    @Nancy , You have GRASS working fine in text based interface. You cannot run directly the command from the console because you are not defining the mapset first. That is GRASS GIS. In QGIS you have another two GRASS: the GRASS plugin, and processing algorithms implementations for QGIS. All of them are different things, installed in different folders. i.ortho.rectify GRASS command is not implemented in QGIS processing GRASS provider algorithms. You can run it from the plugin or from the console. But you need to define the mapset and the region. See the GRASS GIS docs if you need it. – Gabriel De Luca Dec 23 '19 at 9:41
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    That is possible. GRASS GIS projects are not exactly like QGIS projects. You will need to understand how GRASS work. But if you really need GRASS tools, that is the better way to do it. Then, you will find that the GRASS Tools plugin is like a GRASS GIS GUI inside QGIS. – Gabriel De Luca Dec 23 '19 at 10:20

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