Don't hear much about GIS but it is possible to track trees with this kind of picture at 1800dpi or 3600dpi. It will take Glens a day or two to down load a 47Mb pic at 1800dpi. Vegetation Management made easier. It is here now and will be a part of the future tree management. Get used to it, it's here to stay. www.dot.state.oh.us/aerial/Samples.asp Click on samples.