Here is a log of a few mostly happy hours spent in the training manual located
at https://docs.qgis.org/3.16/en/docs/training_manual/index.html. Comments
would be welcome. Gary. OS 10.15.7 (Catalina) on iMac Pro. QGIS 3.16.0-Hannover.
4.1.2 Click on the Add New Map button. There is no such button on the
“Swellendam” window.
5.1.2 1. Click on the Select Features button in the Attributes Toolbar. 2.
Click on the feature that was just created and the remaining buttons will
become enabled. The remaining buttons do not become enabled.
5.1.5. If the roads layer is not in your map, then add it from the GeoPackage
file training-data.gpkg included in the exercise_data folder of the training
data you downloaded. At this point, I remember adding a portion of a GeoPackage
file, but I don’t remember how. I am unsuccessful in using the menu Layer ->
Create layer and Open Data Source. When I try to open the GeoPackage file I see
a message that the file is read only. I try Menu Layer —> Add Layer —> Add
Vector Layer —> … file dialog —> roads. This works. I feel a hint would be
useful to avoid some flailing around. Just a note that we are adding an
existing layer from the GeoPackage rather than creating a new layer would be
helpful. Now I see the layer training_data_roads in the Layers box. It is
checked and selected, it is the top layer, but no roads appear on the map. Now
I will have to search back to where a vector layer was first imported from the
GeoPackage. A numerical reference (2.2.3) and link would be useful here. I
delete the “training_data_roads” layer and try again. I use the Open Data
Source Manager and click on the GeoPackage tab. I add the roads, which appear
on the map. Success, but painful and time-consuming success.
I still need the routes.shp file, so I try Menu —> Create Layer —> New
ShapeFile layer. I select Geometry Type line and add the new field “name” in
the dialog box. Error message: Layer creation failed: Failed to create file
routes.shp: Read-only file system. Without the shapefile, the vectors for the
path and track can not be added.
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