PowerPoint Presentation Intro to GIS

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Introducing GIS
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Whatever map you want
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A GIS map contains layers
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Layers may contain features or surfaces

• Each geographic object in a layer is called a
  feature
• City
• River
• Lake
• Country

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Features have shape and size

• Three (3) categories
• points
• lines
• polygons

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Layers may contain features or surfaces

• Not all layers contain features.
• Ocean is continuous expanse
• according to depth
• varied color
• surface

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Surfaces have numeric values
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Features have locations
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Features are linked to information
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Analysis from overlap
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Result of analysis