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GIS |
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Geographic Information System |
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Computer Mapping and Analysis Tool |
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GPS |
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Global Positioning System |
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Handheld device that uses satellites to
determine your location |
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Maps in a computer |
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Layers… |
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“Alike” features are combined in their own layer
(e.g., roads or parks) |
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Layers can be overlaid like transparencies |
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Map sandwich |
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Dynamic & Interactive |
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You display only what you want to see |
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You can ask the GIS questions (queries) |
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The GIS knows that every feature on the map is a
separate “thing” |
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Accurate analysis and measurement |
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Ask the GIS questions… |
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“Show me the streams with a pH under 3.” |
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“Which counties have more than 50 underground
oil tanks?” |
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“Which census tracts have cases of West Nile
Virus?” |
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The GIS will highlight the features that fit
your criteria |
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Vital to the success of your GIS |
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Data are… |
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The map features themselves (e.g., county
boundaries, highways or water wells) |
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Attributes for the features (e.g., population,
width, pH) |
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Digitized and Scanned Maps |
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purchased, donated, free (Internet) |
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created by user |
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Data Bases – Tables of data |
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GPS – Global Positioning System |
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accurate locations |
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Field Sampling of Attributes |
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Remote Sensing &
Aerial Photography |
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Emergency Services – Fire & Police |
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Environmental – Monitoring & Modeling |
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Business – Site Location, Delivery Systems |
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Industry – Transportation, Communication,
Mining, Pipelines, Healthcare |
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Government – Local, State, Federal, Military |
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Education – Research, Teaching Tool,
Administration |
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Wherever Spatial Data Analysis
is Needed |
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Notes