First, download the ortho of your flight from Site Scan into your computer.

1. Open QGIS, drag and drop the ortho file (.TIF) and zoom in to the area of interest.

2. Go to the top-menu -> Layer -> Create Layer -> New Shapefile Layer

3. Customize and click on OK and select a destination folder
Type: Point
CRS: If you data was processed with control points, select your coordinate system here, otherwise don't change anything.
Name: Add a name for your "layer"

4. Click on your new "layer" on the left, and click on the pencil button at the top. 

Then click on the "Add feature button". This will be the center of the ring that you will generate. Then add a name to it and click on OK.
If you want to create multiple rings, set points for each ring you want to create.

When done, click on the pencil button again and "save".

5. Go to Vector -> Geoprocessing tools -> Buffer(s)

6. Set the settings for your rings and click OK
Select the layer that contains your points
Segments: Set the number "50"
Buffer distance: This is the radius of your rings
 - If you process with GCPs, set the radius in the units of your survey data

 - If no-GCPs, then a value of 0.0001 represents roughly 35 ft or 11 m. Use multiples of 0.0001 to set the desired radius

Click on "Browse" and set a destination folder

7. You will now have your rings displayed overlayed on the map.

OPTIONAL - Import rings to Site Scan

Go to the destination folder for these rings. Compress all of the files with the name of your rings into a ZIP

Open Site Scan, go to your flight. Click on Add -> Overlays and select the ZIP file. 

Then just turn them "on" from the "Files" tab. 

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