2. Project preparation

2.5. Creating map themes

To facilitate the changing of background maps, we can configure map themes in our QGIS project.

With map themes you can show only visible layers that are stored in a theme.

All our themes need the survey layer (Groundtruth) on top, followed by the Boundary layer.

We'll make map themes to show them on:

  • Sentinel True Colour
  • Sentinel False Colour
  • OSM online
  • OSM offline
Let's start with the first one:
1. In the Layers panel organise the layers in such a way that Groundtruth is on top, followed by Boundary and then Sentinel_True_Colour.
2. Make sure that these layers are visible by checking the boxes and the others are not visible by unchecking the boxes.
Preparing the Sentinel True Color map theme
3. Click the Manage Map Themes button Manage map themes button and choose Add theme...
Add theme
4. Save the theme as Sentinel True Colour and click OK .
Save as Sentinel True Colour theme
5. Repeat the steps for Sentinel_False_Colour. Make sure the layers are checked like this:
Save as Sentinel False Colour theme
6. Do the same for OSM offline and OSM online.
7. If you now go to the Manage Map Themes button Manage map themes button you can see all themes and switch easily between the themes. Try it.
Map themes
8. Save the project.

These themes can later be chosen in the Input app.