Plotting two Maps on one sheet in QGIS?

Question

I am trying to put two different maps on one sheet, one of them should show the raster image of a survey, the other one the vector-rendering of anomalies of the same area, but without the raster image.

This worked in the editor by just not updating one of the mapframes, but when I save the plan as an image QGIS automatically updates both frames, so they both show the same image.

Does anyone know, how to avoid this?

I am using QGIS 2.8.1

Answer 1

I usually lock the map I want to prevent from updating automatically, using the option 'Lock layers for map item' within map properties in QGIS composer:

1. In the canvas: check the layer(s) you need to display
2. In the composer: create a new map and check the option 'Lock layers for map item' in the element's properties (see screenshot below)
3. Back in the canvas: check the layer(s) you need to display in your second map
4. Back in the composer: create another map. The first map shouldn't follow the canvas changes.

Hope this will help!