Figure 4. Three-dimensional model of part of the outcrop at Big Rock Quarry built from laser scanned (east, north, elevation) points. Total outcrop face is 250 m long and 50 m high. (A) Perspective view (looking northwest) of the laser mapping by a low-resolution, robotic laser range-finding system. The 2722 points are decimeter spaced and are accurate to 5 cm. (B) Three-dimensional terrain model of the outcrop from the points in A. Due to the low resolution of the terrain data, the fracture pattern is not evident. (C) High-resolution point cloud of the same part of the outcrop as in A. The model has 613,083 points at about half-centimeter spacing. (D) Three-dimensional terrain model of the outcrop from the points in C. Fractured pattern of the outcrop is clearly visible. White borders delimit the areas used in the surface classification and fracture analysis. (E) Photo realistic model of the outcrop at Big Rock Quarry.