|  | 
 | Virtual Antarctica (1) | virtual globe (1) | virtual observatories (1) | 
 | visualization (1) | Visualization, Arctic DMS, AAGRUUK, ArcView 3.3 (1) | Volterra algorithm (1) | 
 | voluntary geographic information (1) | volunteered geographic information (1) | Voronoi cells (1) | 
 | Voronoi diagram (1) | Voronoi map algebra (1) | VR-Ocean (1) | 
 | vulnerability | tsunami | evacuation | hazard | disaster (1) |  |  |