Miralles Lines, Curvature Analysis through Graphic Differential Geometry 3: Tangent & Normal Notation. In order to find a common notation that can describe all three curves, a notation of lines tangent and normal to the curves is introduced. Each tangent vector describes the trajectory at an instant along the curve. Each normal vector is extended to the center of the circle that best approximates the radius of curvature at that instant.
Miralles Lines, Curvature Analysis through Graphic Differential Geometry 2: Linear & Radial Measurement Notations. These notations can translate the retaining wall and enclosure wall into numeric notations, but fail to numerically describe the complex curve signifying the paving/landscape division.