Representing Geography

Representing Geography - GGS 311: Introduction to...

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GGS 311: Introduction to Geographic Information Systems Chapter 3: Representing Geography Dr. Matt Rice George Mason University Fall 2011
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Question What coordinate system are these units likely associated with? 621,161 m E 3,349,894 m N UTM? PLSS / Township and Range? Latitude and Longitude in decimal degrees (DD)? Latitude and Longitude in degrees, minutes, seconds (DMS)?
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Chapter 3: Learning Objectives The importance of understanding representation in GIS The concept of fields and objects their fundamental significance Raster and vector representation and how they affect many GIS principles, techniques, and applications The paper map and its role as a GIS product and data source The importance of generalization methods and the concept of representational scale The art and science of representing real-world phenomena in GIS
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Sensing the World Personal experience limited in time and space One human lifetime A small fraction of the planet’s surface All additional knowledge comes from books, the media, movies, maps, images, and other information sources From indirect or “remote” sensing
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Schematic representation of the lives of three US citizens in space (two horizontal axes) and time (vertical axis)
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Representations Are needed to convey information Fit information into a standard form or model In the diagram the colored trajectories consist only of a few straight lines connecting points Almost always simplify the truth that is being represented There is no information in the representation about daily journeys to work and shop, or vacation trips out of town
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Representations Occur: In the human mind, when information is acquired through the senses and stored in memory In photographs, which are two- dimensional models of light received by the camera In written text, when information is expressed in words
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Digital Representation Uses only two symbols, 0 and 1, to represent information The basis of almost all modern human communication Many standards allow various types of information to be expressed in digital form MP3 for music JPEG for images ASCII for text GIS relies on standards for geographic data
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This note was uploaded on 01/23/2012 for the course GGS 311 taught by Professor Dr.rice during the Fall '11 term at George Mason.

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Representing Geography - GGS 311: Introduction to...

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