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10 Cards in this Set

  • Front
  • Back
data model
set of constraints used for representing and describing real world objects and processes, relationships
conceptual model
first step in modelling
lists, flow diagrams
puts concepts into cpu language
logical model
describes structure of some domain of info
uses tables columns, associated w/ concept.
physical model
physical storage of data
in actual database, using cpu's
science and mathematics of geometric relationships
topologic realtionship - non-metric properties of geographic objects which remain constant when space is distorted
planar enforcement
mutually exclusive, mutually exhaustive
rules used to built point, line, polygon features - no poly overlap etc
continuous shape, just distorted
object oriented data model
starts with object and its relationships
networks, heirarchy
mistakes - no ref to gis, budgetting time, too vague, not functional
role of data modelling
gives real world model to people who interpret it.
real world - gis data modelling - operational gis - people interp.
raster vs vector data model
raster - implementation of field conceptual model - cells rep objects - background maps/spatial analysis
vector - discrete object conceptual model - point/line/area representation - uses coordinates