spatial data models raster –exhaustive regular or irregular partitioning of space –associated...
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![Page 1: Spatial data models Raster –exhaustive regular or irregular partitioning of space –associated with the field view –location-based Vector –points, lines,](https://reader035.vdocument.in/reader035/viewer/2022081520/5697c01a1a28abf838ccef1b/html5/thumbnails/1.jpg)
Spatial data models• Raster
– exhaustive regular or irregular partitioning of space– associated with the field view– location-based
• Vector– points, lines, areas– associated with the object view– object-based
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Spatial data models
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Vector data models
• An object (as opposed to field or location) viewpoint of space
• represent geographic entities as discrete objects composed of points, lines, and polygons
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Vector data models
• Spaghetti vector data model– each point, line, or polygon that represents a
geographic entity is stored as a record in a file that consists of that entity’s ID and a list of coordinates that define it’s location (or the coordinate space that it occupies)
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Vector data models
• Spaghetti vector data model
– relationships among objects are implied
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Vector data models
• Spaghetti vector data model– advantages
• simple
• efficient for display and plotting
– disadvantages• inefficient for most types of spatial analysis
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Vector data models
• Vector topologic data model
– composed of points, lines, and polygons– node: a point at the intersection of two or more
lines– in addition to coordinate locations, the
topologic relationships between geometric features are explicitly recorded
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Vector data models
• Vector topologic data model
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Vector data models
• Vector topologic data model
![Page 10: Spatial data models Raster –exhaustive regular or irregular partitioning of space –associated with the field view –location-based Vector –points, lines,](https://reader035.vdocument.in/reader035/viewer/2022081520/5697c01a1a28abf838ccef1b/html5/thumbnails/10.jpg)
Vector data models• Vector topologic data model: GBF/DIME
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Vector data models
• Vector topologic data model: POLYVRT (hierarchical data structure)
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Vector data models• Freeman - Hoffman chain-code for compacting vector storage
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Vector data model
• TIN: Triangulated Irregular Network
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Vector data model
TIN: Triangulated
Irregular Network
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Vector data model• TIN: Triangulated Irregular Network
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Vector data model
• Hybrid vs. integrated systems for vector data models– A hybrid system stores spatial data in one type
of data model and the attribute data in another data model that is often an existing commercial non-spatial database
– An integrated system manages both spatial and attribute data using the same data model
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