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A landform-based approach for the representation of terrain silhouettes

The research proposed in this paper introduces a qualitative approach whose objective is to identify a computational representation of terrain features. The model developed is derived from the horizon and the forms that materialise the frontier between Earth and the sky. This frontier is represented as a silhouette and modelled as a sequence of constituent landforms. These constituent landforms give a complete set of orthogonal and sound primitives that can be used and computed to represent silhouettes at different levels of abstraction. Pre-categorisation of the set of landform constituents favours the generation of landform sequences adapted to user requirements. This flexibility is adapted to geographical contexts where terrain entities are interpreted and made of indeterminate boundaries. A prototype implementation illustrates the potential of the approach by an interface that allows for the integration of sample silhouettes and computation of landform sequences.