In this video we cover how to separate plots and extract data from drone imagery using shapefiles in QGIS.
1:10 Measuring plot size
2:24 Creating the grid
6:30 Editing the grid (color, position, rotation)
18:23 Accessing the attribute table
21:12 Zonal Statistics: Adding plot data to attribute table
26:55 Moving attribute data to other programs

If you found these methods useful, please consider citing our recent paper in the journal Remote Sensing:

Parker, T. A., Palkovic, A., & Gepts, P. (2020). Determining the Genetic Control of Common Bean EarlyGrowth Rate Using Unmanned Aerial Vehicles. Remote Sensing, 12(11), 1748.