An innovative system is created for annotating photos used for model construction while observing outcrops in the field or virtual 3-D models with a computer using an applet on a tablet (herein iPad). Geologic tracings can be converted into 3-D points (from the pixels) with a Matlab program so that geologic information such as strike/dip can then be determined and quantitatively analyzed. Three sets of road-cut outcrops including the Cambro-Ordovician carbonates of the Arbuckle anticline, Oklahoma, the Paleozoic fluvial deltaic sedimentary rocks of the Breathitt Group, Pikeville, Kentucky,...