t4 - Geography 231 Introduction to Geospatial Methods Topic...

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1 Geography 231 Introduction to Geospatial Methods Topic 4: Geographic Phenomena and Data II: The Nature of Geographic Data Goals for This Topic Finish off our look at raster and vector data models with a quick look at their file structures Understand the concepts of geographic scale and cartographic scale, and make sure we know the difference! Look briefly at the impact of scale and spatial resolution on cartographic generalization
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2 Rasters Based on grid cells Normally called pixels Each grid cell holds one attribute E.g. brightness, elevation, etc… Are usually easy to process Normally take up more storage Normally take up more storage space Remote sensing data is nearly always in the form of rasters Raster File Structure
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3 Vectors Uses the point (node) and the connecting segment as building blocks Can represent points, lines, areas, or volumes very accurately Can develop topology Adjacency, containment, and connectivity Vector File Structure
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4 The Various Definitions of “Scale” Geographic Scale: Refers to the extent of the map, or size of the object under investigation
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This note was uploaded on 02/04/2010 for the course GEOG 158 taught by Professor Dobson,j during the Spring '08 term at Kansas.

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t4 - Geography 231 Introduction to Geospatial Methods Topic...

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