Projections: various coordinate transformations for vector and grid data (using Proj4 and GeoTrans libraries), georeferencing of grids.
The Saga of Darren Shan | The Forsyte Saga | GIS | Saga | The Twilight Saga (film series) | The Twilight Saga: Breaking Dawn – Part 1 | Saga (band) | Orkneyinga saga | Óláfs saga Tryggvasonar | Laxdæla saga | Hell's Angels: The Strange and Terrible Saga of the Outlaw Motorcycle Gangs | Ynglinga saga | Saga Prefecture | Íslendinga saga | GRASS GIS | Excel Saga | Arita, Saga | Víglundar saga | Vanguard: Saga of Heroes | The Twilight Saga: New Moon | The Twilight Saga | Seafort Saga | SaGa (series) | Saga Domain | SaGa | saga | Roots: The Saga of an American Family | Illuga saga Gríðarfóstra | Eyrbyggja saga | Egils saga einhenda ok Ásmundar berserkjabana |
A viewshed analysis can be performed using one of many GIS programs, such as GRASS GIS (r.los, r.viewshed), SAGA GIS (Visibility), TNT Mips, ArcMap, Maptitude, ERDAS IMAGINE.