Depending on the AHJ's definition of "Outdoors" you may or may not need GFCI protection. IMHO if it is elevated and not accessible from grade, meaning you can't stand on the ground and reach the receptacle as you discribed I would not expect to see GFCI protection as a requirement. I would say tho that if it were my own home and I planed on using this receptacle for use with a hand held piece of equipment on the ground I'd pop for the GFCI.
