AppendixA_4Ed_Sp08 - Appendix A Maps and Geographic...

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Appendix A Maps and Geographic Information Systems MAPS : - representations of the world - two dimensional graphic representations that use lines and symbols to convey information/ideas about spatial relationships - social products - expressing particular interpretations of the world * Topographic Maps ( General-Reference ): represent the form of Earth’s surface (horizontal and vertical dimensions), showing permanent (or long-standing) features – buildings, highways, field boundaries, or political boundaries. The height of landforms is represented by contours lines that connect points of equal vertical distance above/below sea level (0m). * Geographic Maps ( Thematic/Statistical ): display a spatial pattern of a theme (attribute) or variables. 1
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Devices – allow cartographers to portray spatial variations or relationships . e.g.: isolines, proportional symbols, shades, located charts - isolines (isopleth maps) - connect places of equal data value (e.g. – air pollution). -
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AppendixA_4Ed_Sp08 - Appendix A Maps and Geographic...

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