Terrain Prickliness: Theoretical Grounds for High Complexity Viewsheds. - Ankush Acharyya; Ramesh K. Jallu; Maarten Löffler; Gert G. T. Meijer; Maria Saumell; Rodrigo I. Silveira; Frank Staals (GIScience (II), 2021)

Terrain prickliness: theoretical grounds for low complexity viewsheds. - Ankush Acharyya; Ramesh K. Jallu; Maarten Löffler; Gert G. T. Meijer; Maria Saumell; Rodrigo I. Silveira; Frank Staals; Hans Raj Tiwary (CoRR, 2021)