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I am currently working in Qgis (2.18.11) and I would like to view mi map window duplicated so I can represent a thematic map with different values in each window and compare both.

I usually do this in MapInfo (Map > Clone view). See the example:

enter image description here

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Yes, you can use the Dockable MirrorMap plugin which allows you to create multiple canvas windows:

Example


You can download this from the menubar:

Plugins > Manage and Install Plugins
  • It is good, but not exactly what I was looking for. Dockable MirrorMap only draws one layer at a time and changes the scale of the mirrormap when the scale is chankged in the original map. – Pescariz Aug 25 '17 at 11:58
  • @Pescariz - Uncheck the Render option so that the image remains static. If you click the plugin icon multiple times, you can create multiple windows :) – Joseph Aug 25 '17 at 11:59
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    Thanks! I just realised that by checking the lock next to the scale, it remains still too. It's just a pity if a map has many layers, one needs to click and click so many times. – Pescariz Aug 25 '17 at 12:07
  • @Pescariz - Most welcome! Note that the dockable windows display the canvas, not necessarily the individual layers. So you can have as many layers as you want shown in each map :) – Joseph Aug 25 '17 at 12:11
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Not exactly the same, but you can duplicate the layer (right click > 'Duplicate') which adds the layer again (as opposed to making a copy) which you can then style in a different way. If you put the layer and its duplicate into a group and then make the group mutually exclusive ( needs a reasonably recent version of QGIS) you can then toggle between the styling options.

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