Lecture-4b_Bb_1SlidePerPage

Lecture-4b_Bb_1SlidePerPage - Geometry of Features Two...

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Geometry of Features Two Levels of Geometry: Feature Geometry, and Components of Feature Geometry Feature geometry Components
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Topology Topology May Be Employed To Help Maintain _______________!
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Topology Two Database-Oriented Approaches For Managing And Storing Topology: _________ Model _________ Model _________ Model Focuses on the storage of an arc-node data structure. This is the _________ means of storing Topology
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Topology _________ Model (Cont.) Said to be _________ because: • Each object is decomposed into individual topological primitives for storage in a Dbase • Then reassembled at query time. – See discussion under Representing Geography & Data Modeling
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Topology Normalized Model (Cont.) This is the model employed by ESRI’s _________ Model • Explicitly defines, stores and maintains the topological information • Employs a fixed set of tools for creating and maintaining topology. • Topological integrity is steadfastly maintained. – Un-cleaned Coverages cannot be used
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Topology _________ Model Features are NOT _________ _________ into Topological primitives! Instead, each feature/object stores its entire geometry. • This means that coincident polygons/polylines will have duplicate geometries – The geometry of these features are SIMPLE – Leaves potential for slivers!
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Topology Physical Model (Cont.) Topological Relationships are computed on-the-fly! • Unlike the Normalized Model which explicitly
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This note was uploaded on 09/21/2011 for the course GIS 4043C taught by Professor Roberts during the Spring '11 term at FAU.

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Lecture-4b_Bb_1SlidePerPage - Geometry of Features Two...

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