I think that most places its illegal for commercial uav flying. In the states people refer to it as a grey area of the law. But I have talked to people who do large scale UAV GIS mapping, who also serve on FAA boards, and to paraphrase they said, "its not grey, its illegal for commercial purposes, the faa just does not have a police force." So from what I can tell its illegal in the US but people do it anyway without issue, yet.