The initial contour of an obstacle (Left); the expanded contour

The Five Basic Rules for Designing a Great Golf Course - WSJ

Contour map (a) with its corresponding contour tree (b), contour graph

Definitions of coastal terms - Coastal Wiki

Multi-obstacle path planning and optimization for mobile robot - ScienceDirect

Contour line - Wikipedia

ANAVMG: Automatic generation of suboptimal Navmeshes for 3D

Initial Contour - an overview

Seeing the map in 3D - Wilderness Magazine

Free-surface disturbances due to the submersion of a cylindrical obstacle, Journal of Fluid Mechanics