Map canvas overlay layers QGIS

How do you intersect layers in QGIS?

In the Processing toolbox there is an option under QGIS geoalgorithms/Vector selection tools ‘Select by location’. With this option you can select the features that are overlapping, intersecting and/or touching. The features can be saved to a new file by right-clicking the layer and choosing Save as.
 

How do I merge vector layers in QGIS?

Click on the Vector menu, Data Management tools, Merge Shapefiles to One



Process

1. Select the folder where the two (or more) shapefiles you want to merge are located using the Browse button.
2. Click browse next to Output shapefile, find your working folder, and name the output shapefile.
3. Click OK.

What is map canvas in QGIS?

The Map canvas widget is probably the most important widget within QGIS because it shows the map composed from overlaid map layers and allows interaction with the map and layers. The canvas always shows a part of the map defined by the current canvas extent.