        
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Spatial representation
Real world objects can be represented in the GIS as
points, lines, areas and surfaces.
- Points (eg. trees,
houses, road intersections)
- Lines are one dimensional
( eg. roads, rivers, regional boundaries, fences)
- Areas are two-dimensional
( eg. administrative regions, land cover types, geological regions)
- Surfaces are
three dimensional (e.g. hills, valleys)
Objects are represented within conceptual
models and translated into a computer format using data
models.
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