Select features: Edit>Select>Select Features by [Value, Expression, etc.]. To Edit>Select>Select Features by Expression, use this example: “FACILITY_N” LIKE ‘%Reston Pkwy%’ AND “TREATMENT_” = ‘Trail’ OR “FACILITY_N” LIKE ‘%Lawyers Rd Trail%’ OR “FACILITY_N” LIKE ‘%West Ox Rd Trail%’ where LIKE means contains. To Deselect features, hold the Cmd key and use Select Features by Freehand button. Other examples” “FACILITY_N” LIKE ‘%Gallows Rd Trail%’ OR “FACILITY_N” LIKE ‘%Route 50 Trail%’ OR “FACILITY_N” LIKE ‘%Route 50 Path%’ OR “FACILITY_N” LIKE ‘%Fairfax County Parkway Trail%’ OR “FACILITY_N” LIKE ‘%Braddock Road Trail%’ OR “FACILITY_N” LIKE ‘%Braddock Rd Trail%’ or “FACILITY_N” LIKE ‘%Braddock Rd Sidewalk%’ OR “FULLNAME” LIKE ‘%I66 WB%’ OR “FACILITY_N” LIKE ‘%Lorton Rd%’ AND “TREATMENT_” LIKE ‘%Trail%’ OR “FACILITY_N” LIKE ‘%Cross County Trail%’
To delete a selected feature, select the layer, right-click and select Toggle Editing, then use the Delete Selected icon in the toolbar. The Toggle Editing again.
To change color of selection and background: QGIS>Preferences>Canvas & Legends – Applies to new projects.
To create a new layer from a selection: Right click on the layer with the selected features. Choose: Export>Save Selected Features As... use GeoPackage format OR Select the features and then use Edit>Copy and then Paste Features As>New Vector Layer (or a Scratch layer).
Transfer Strava data to QGIS – Navigate to one of your Activity pages and from the more (ellipses) menu, select “Export GPX“. In QGIS use Layer>Add Layer>Add GPX Layer…
To merge two layers – Use the Processing Toolbox>Vector general>Merge vector layers. Select the Input layers by clicking on the box next to each layer. Then select the Merged layer name and click Run.