- On the ribbon, click
Raster Tools tab
Edit panel
Remove drop-down menu
Diagonal Region.
- Select a starting point for the diagonal region. This point can be any corner of the area you want to remove.
- Select a second point to define one of the edges of the region you want to remove.
- A bounding parallelogram is displayed to help you select the next point.
- Select the third point to remove data within the diagonal rectangle or parallelogram.