- Software: QGIS 3.22
- OS: Any
- Updated: October 2021
I want to put an arrow or triangle to show me the direction of digitizing. In this case I have a road and it’s important to know which way the person digitized it. Maybe I have a stream and I need to know if it is flowing “uphill” vs “downhill”.
Open QGIS and add your vector data.
Right click the layer and go to properties -> Symbology. You should have a simple line as you symbol.
Add a marker line symbol by pressing the plus button.
Change the marker line placement to on central point.
Change Simple Marker to a triangle and be sure to set the rotation to 90 degrees.
If I change the marker size to something larger than normal – you should have an arrow (triangle) pointing downstream.
There are several other ways to accomplish this but this seems to hold true between versions of QGIS