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Analysis and Modeling in GIS
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Analysis and Modeling in GIS
Hữu Minh
85
46
ppt
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Description: Using GIS to create descriptive models of the world --representations of reality as it exists. Analysis: Using GIS to answer a question or test an hypothesis. Often involves creating a new conceptual output layer, (or table or chart), the values of which are some transformation of the values in the descriptive input layer. --e.g. buffer or slope or aspect layers | Analysis and Modeling in GIS GIS and the Levels of Science Description: Using GIS to create descriptive models of the world --representations of reality as it exists. Analysis: Using GIS to answer a question or test an hypothesis. Often involves creating a new conceptual output layer, (or table or chart), the values of which are some transformation of the values in the descriptive input layer. --e.g. buffer or slope or aspect layers Prediction: Using GIS capabilities to create a predictive model of a real world process, that is, a model capable of reproducing processes and/or making predictions or projections as to how the world might appear. --e.g. flood models, fire spread models, urban growth models The Analysis Challenge Recognizing which generic GIS analytic capability (or combination) can be used to solve your problem: meet an operational need answer a question posed by your boss or your board address a scientific issue and/or test a hypothesis Send mailings to property owners | Analysis and Modeling in GIS GIS and the Levels of Science Description: Using GIS to create descriptive models of the world --representations of reality as it exists. Analysis: Using GIS to answer a question or test an hypothesis. Often involves creating a new conceptual output layer, (or table or chart), the values of which are some transformation of the values in the descriptive input layer. --e.g. buffer or slope or aspect layers Prediction: Using GIS capabilities to create a predictive model of a real world process, that is, a model capable of reproducing processes and/or making predictions or projections as to how the world might appear. --e.g. flood models, fire spread models, urban growth models The Analysis Challenge Recognizing which generic GIS analytic capability (or combination) can be used to solve your problem: meet an operational need answer a question posed by your boss or your board address a scientific issue and/or test a hypothesis Send mailings to property owners potentially affected by a proposed change in zoning Determine if a crime occurred within a school’s “drug free zone” Determine the acreage of agricultural, residential, commercial and industrial land which will be lost by construction of new highway corridor Determine the proportion of a region covered by igneous extrusions Do Magnitude 4 or greater sub-oceanic earthquakes occur closer to the Pacific coast of South America than of North America? Are gas stations or fast food joints closer to freeways? Availability of Capabilities in GIS Software Descriptive Focus: Basic Desktop GIS packages Data editing, description and basic analysis ArcView Mapinfo Geomedia Analytic Focus: Advanced Professional GIS systems More sophisticated data editing plus more advanced analysis ARC/INFO, MapInfo Pro, etc. Provided through extra cost Extensions or professional versions of desktop packages Prediction: Specialized modeling and simulation via scripting/programming within GIS VB and ArcObjects in .
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