In Canada, monitoring crops or livestock is considered to be a "commercial" operation. It was explained to us in our CCUVS course that this activity provides a "financial advantage" and thus it is required to file for an SFOC (Special Flight Operations Certificate). One, I suppose, could argue the point. Use of a UAV is definitely advantageous, but is it a financial advantage? Not sure that this has ever been tried in court here. Tongue in cheek - "One certainly would not want anyone to have a financial advantage!"