Lecture06

Lecture06 - Todays Themes Geography 128 Lecture 6 Data...

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Geography 128 Lecture 6: Data Storage and Representation Today’s Themes z How we represent the world makes a big difference in how we map it z Technology impacts how the computer can store maps z The scale transformation and data capture errors abound: be wary! Hardware for Computer Cartography Clarke, K., 1995, Analytical and Computer Cartography Input Devices for Computer Cartography
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What is Geocoding? z “Geocoding is the conversion of spatial information into computer-readable form. As such, Geocoding, both the process and the concepts involved, determines the type, scale, accuracy and precision of digital maps” – K., Clarke, 1995 z Geocoding involves capturing the coordinates, and sometimes also capturing the attributes z Often involves address matching What is Geocoding? (cnt.) z Real world broken into phenomena, landscapes z Phenomena can be broken down into cartographic entities z Entities are geocoded to become cartographic objects – Geometry – Topology – Attribute Two fundamentally different data models z Features Objects Entity-by-entity Point/Line/Area/(Volume) Based on coordinates with given precision z Fields Variable is continuous Measurement can take place anywhere Samples are used, sampling strategy matters Common issues with Cartographic Data Models z Holes z Undefined areas z Discontinuities z Multi-values z Uncertainty
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Topology Non-topological Approach Topological Approach
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This note was uploaded on 12/28/2011 for the course GEOG 128 taught by Professor Staff during the Fall '08 term at UCSB.

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Lecture06 - Todays Themes Geography 128 Lecture 6 Data...

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