Gis

Front 1

data model

Back 1

set of constraints used for representing and describing real world objects and processes, relationships

Front 2

conceptual model

Back 2

first step in modelling
lists, flow diagrams
puts concepts into cpu language

Front 3

logical model

Back 3

describes structure of some domain of info
uses tables columns, associated w/ concept.

Front 4

physical model

Back 4

physical storage of data
in actual database, using cpu's

Front 5

topology

Back 5

science and mathematics of geometric relationships
topologic realtionship - non-metric properties of geographic objects which remain constant when space is distorted

Front 6

planar enforcement

Back 6

mutually exclusive, mutually exhaustive
rules used to built point, line, polygon features - no poly overlap etc

Front 7

contiguity

Back 7

continuous shape, just distorted

Front 8

object oriented data model

Back 8

starts with object and its relationships
networks, heirarchy
mistakes - no ref to gis, budgetting time, too vague, not functional

Front 9

role of data modelling

Back 9

gives real world model to people who interpret it.
real world - gis data modelling - operational gis - people interp.

Front 10

raster vs vector data model

Back 10

raster - implementation of field conceptual model - cells rep objects - background maps/spatial analysis
vector - discrete object conceptual model - point/line/area representation - uses coordinates