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ENV510 Landscape Ecology and GIS
Definitions
& descriptions | Concepts
& issues | Setting
up GIS | Using
GIS
| Applications
Representation
| Spatial data | Referencing
| Data issues
| Accuracy
| Error
| Management
| File systems | DBMS
| Hierarchical
| Network
| Relational
| OO
Object-oriented
database structures
originated out of the concepts of object-orientated programming languages. Their
use in GIS has been encouraged by the need to handle complex entities more sophisticatedly
than as simple point, line and polygon features, and also because of the problems
that arise in the database due to GIS operations like polygon overlay.
Object-oriented
approaches combine the speed of hierarchical and network approaches with the
flexibility of relational approaches.
The data
are defined in terms of a series of unique objects which are organised into
groups of similar phenomenon (object classes).
Relationships between different objects and classes are established through explicit links (Burrough and McDonnell, 1998).
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