Geo 370 Exam 2 - March 9th 2010 Tuesday Lecture Exam 2...

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March 9th, 2010 Tuesday Lecture Exam 2 Linear Symbols and Flow Maps Flow Maps Ch. 19 - A thematic mapping technique not commonly used. - Flow maps generally utilize lines of varying width to depict the movement of phenomena between geographic locations. Done using flow lines of varying thickness. - Can be based on either quantitative or qualitative data Types of Flow Maps - Distributive Flow maps = depict the movement of commodities, people, or ideas between geographic regions - Network Flow Maps = depict flows within a network (e.g., a transportation network) - Continuous Flow Maps = depict the flows of continuous phenomena such as wind speed and direction. Characteristics of Flow Maps - Qualitative data or Quantitative Data depicted - Ex. of Quantitative (more common)-> depict numerical (interval or ratio- level data) The magnitude of migration between European and Asian countries and the US between 1961 and 200. - Ex. of Qualitative (less common) depiction of various linear features such as roads, streams, and railroads by respectively, red, blue, and black lines. (ordinal relationship) - Conceptual or True point locations - conceptual-> maps of migration population of each country originates from various locations within that country, but is illustrated as originating from a single point. - True-> represent the true point locations in direct proportion. - Based on Standardized or Unstandardized Data - Unstandardized-> (more common) Types of Flow Maps 1. Distributive Flow Maps a. depict the movement of commodities, people, or ideas between geographic regions. b. Important to distinguish two sub categories i. first typically maps the entire world or a large portion, and attempts to depict the actual routes of flow. ii. the second depicts the flow of a phenomenon within a portion of the Earth’s land surface (e.g., within a country). In this case the precise route of flow is not
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as important as the general direction and magnitude; thus, straight lines of varying width can be drawn between the origin and the destination points. (Example is the maps of migration) 1. Network Flow Maps a. depicts flows within networks, such as the transportation network. b. Shipping routes noted to be networks, a legend should be used. 1. Radial Flow Maps a. maps that have a distinctive radial pattern, such as a map centered on Kansas showing migration from Kansas to other states as a result of the Dust Bowl in the 1930s. 1. Continuous Flow Maps a. depicts the movement of a continuous phenomenon such as wind or ocean currents b. Such phenomena are usually composed of two attributes, magnitude and direction, that can change at any geographic location. i. For example, at any point on the ocean surface, we can measure the speed of the current and the direction from which it flows. **Mapping Continuous Flows**
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Geo 370 Exam 2 - March 9th 2010 Tuesday Lecture Exam 2...

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