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Published byAlyson Day Modified over 6 years ago
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Maps and Mapping Never have so many poor maps been made so quickly
Types of maps Data types and measurement Symbolization Classification Map scale Map layout
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Maps A representation of the earth surface on a flat medium at certain scale A model of spatial patterns of features Selective Classified Generalized: point, line, areas Graphically customized
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Types of Maps General purpose maps Thematic maps Where? Topography
What A theme
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General Purpose Maps
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Thematic Maps
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Thematic Maps
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Map Elements A Map Title: what, where, when Scale Orientation Legend
Others
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Symbolization Symbols Point Lines Areas
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Symbolization Qualitative difference Quantitative difference
Different things Landuse, residential, commential Highways, Railways Quantitative difference Essentially same thing, but different in degree Population density Temperature Crime rate Population
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Qualitative Differences
Different shapes Different patterns Different colors
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Quantitative Difference
Size of symbol Value of color
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Symbolization Points Lines Areas Qualitative Quantitative
Shape Color (Hue) Pattern Size Value Points Lines Areas
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Choropleth Map
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Area Map
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Isopleth Map
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Bad Choice of Colors
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Map Scale Representation Representation fraction (RF): 1:2,500
Graphic scale Verbal scale: one cm on the map represents 25 meters on the ground
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Large scale vs. small scale
25, , ,000 Smaller
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Orientation: North Arrow
North arrow appropriate
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Orientation North arrow not appropriate
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Grid
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Classification Equal Interval Natural breaks Quartiles
The range of possible values is divided into equal-sized intervals Natural breaks Finding the biggest gap Quartiles Same number of observations in a class Standard deviations Mean and standard deviation Equal area
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Natural Break Percentages of Asian Pacific Islanders, 1999
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Equal Interval
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Quantile
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