Spatial and Temporal Information

Temporal interval relations; temporal logic

  • state-based representations; actions as state changes; preconditions - body of an action - effect
  • temporal annotation: actions are represented as state changes that are annotated with temporal data such as duration
  • non state-based representation: for example, Allen's interval logic which uses "time period" and "meet" as primitives and the basic relations "equal", "before", "meets", "starts", "finishes", "during", "overlaps".

    Spatial information

  • raster data: pixel- or cell-based; cannot be scaled; can represent complex continuous features; examples: gif files, jpeg files, bitmaps
  • vector data: points and lines in a coordinated system; object-oriented; can be scaled; examples: CAD, Flash, VML
  • attribute data: non-spatial attributes that apply to spatial information
  • geographic information systems: storage, analysis and retrieval of spatial information