EMSE 6340 Chapter Notes - Chapter Slocum 4: Phenome, Contour Line
3 Jun 2016
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Week 2: slocum et al. , chapter 4: principles of symbolization. Four common thematic mapping techniques: choropleth (most common method for thematic mapping) Portray data for larger units such as counties or states. Limitations: don"t portray variation within units, and the enumeration units are set arbitrarily. Need data standardization (e. g. consider the size of each unit instead of just using raw totals: proportional symbol. Data is portrayed by scaling symbols in proportion to the data magnitude (e. g. differing sizes of circles) Subset of an isarithmic (or contour) map that interpolates isolines between sample points (e. g. maps showing temperatures in a continuous smooth manner) Use when the data collected are a part of a smooth continuous (2 -d) phenomenon: dot. One dot = an amount of a phenomenon (more dots = more likely for something to occur) In order to decide on an appropriate technique, consider: Various levels where we measure geographic phenomena. Types of symbols available for representing spatial data.
