When making a target (or "Witness") for use in either Radionics or Symbolic Radionics, it is important to make it as specific as possible. With a person, it is best to edit a clear, recent picture of a face, and edit add text of current location, and possibly a date or at least a year of birth.
If a piece of land is the target, it is fairly easy to make a target through the use of Google Earth and Microsoft Paint, or other photo editor. I will take you briefly through the process below, as I am making a target from a nursing home near Seattle.