Geography 1400F/G Lecture : Why Care About Maps
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16 Jan 2012
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Maps have been important in the past because of hunting, trade, navigation, and land division. Maps can be used for spatial analysis (ex: john snow s map of the london cholera outbreak) Integrates hardware, software, and data for capturing, managing, analyzing, and displaying all forms of geographically referenced information. Contributors are people, data, analysis, hardware, and software. Data collection (work study students/interns) data management (research assistants/grad students) data analysis (research assistants/grad students) data presentation (grad students/professors) decision making (professors/planners/politicians) planning process real world. Concepts of gis types of spatial data: We can use both concepts together through layering. Grid uses cells or pixels like a digital picture. Has unique values (ex: elevation, land use, climate data) Has entity points, label points, and nodes (ex: incidents, people, intersections, fire hydrants) Polylines are line segments, links, chains and arcs (ex: road and sewer networks, rivers) Polygons are a closed area (ex: parks, buildings, census tracts)
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