(ster’ ē ∂ graf, ik) 1. A representation of directional information used in three-dimensional structural problems. A stereonet or Wulff net is used if angular relations are to be preserved and a Schmidt or Lambert net if areas are to be preserved. Lines are represented as points indicating their direction, planes as either great circles (cyclographic projection) or points for axial lines perpendicular to the plane (polar projection). See Figure S-24. 2. A projection used to map the Earth; see Figure M-4.