15_Point Symbol Mapsdblines2

15_Point Symbol Mapsdblines2 - Point Symbol Maps Dot Maps...

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Point Symbol Maps Dot Maps Graduated Symbol Maps
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Dot Maps Indicate distribution of data by repetition of a uniform symbol, usually a small, dark, filled circle Dot size and value (and sometimes color) are the visual variables used Eye is drawn to portions of the map that are unequal in dot density- good at illustrating density using raw data (unlike choropleth that uses standardized data)
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Campbell, 1984
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Dot Placement Dot maps made by most simple computer programs simply scatter the symbols randomly within an enumeration area A better way is to use “ limiting factors ” that guide the placement of dots within areas Often dot maps are produced at one scale (e.g., state) from data actually collected at a finer scale (e.g., county) This provides a rationale for within-unit distribution of dots (i.e., not random)
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Dent, 1996 Map hogs on: Private land Outside of urban areas Topographic slope is less than x% Such limiting factors provide location filters for dot placement allow for a more accurate representation of density
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Cuff and Mattson, 1982 If you are going to map hog production, you should be cognizant of where hogs can and cannot be produced.
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This note was uploaded on 04/01/2012 for the course 044 005 taught by Professor Davidbennett during the Fall '11 term at University of Iowa.

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15_Point Symbol Mapsdblines2 - Point Symbol Maps Dot Maps...

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