I understand that the greens are different from course to course. So i have a question. Would it be better to map my irons by hitting them up and down a fairway OR by hitting from a fairway onto a green? It seems to me that hitting from fairway to green would give me a better indication of what kind of roll out i could expect when applying different degrees of spin,so that is the way i am leaning at present. I did a forum search on mapping irons and ran across a thread concerning this and am looking for a little more insight beyond what i read. Any help will be greatly appreciated. Thank you in advance.