Abstract
The circle has long been a useful symbol for displaying quantitative data. Determining the proper size for the circles has remained a problem. If the circles are too small, differences in size are not readily apparent and a pattern is not evident. If the circles are too big, the overlap between the symbols will be excessive or too much of the map will be covered. A method is proposed here that allows the user to interactively adjust both the size and the opacity of the circle shading. The online version of the map, with all relevant code, is available at: http://maps.unomaha.edu/GoogleMapGallery/GradCircles/circles.htm
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References
Chang KT (1977) Visual estimation of graduated circles. Can Cartogr 14(2):130–138
Flannery JJ (1971) The relative effectiveness of some common graduated point symbols in the presentation of quantitative data. Cartogr Int J Geogr Inf Geovis 8(2):96–109
Google. Google maps API. http://code.google.com/apis/maps/documentation/reference.html. 19 Apr 2010
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© 2012 Springer-Velag Berlin Heidelberg
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Paziak, D. (2012). User Scalable Graduated Circles with Google Maps. In: Peterson, M. (eds) Online Maps with APIs and WebServices. Lecture Notes in Geoinformation and Cartography(). Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27485-5_13
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DOI: https://doi.org/10.1007/978-3-642-27485-5_13
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Publisher Name: Springer, Berlin, Heidelberg
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Online ISBN: 978-3-642-27485-5
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