Pie Charts are some of the first forms of geovisualization to be developed. They are divided into sectors, illustrating relative magnitudes or frequencies or percents.
This chart shows the cause of weather-related deaths in Texas from 1988 to 2005.
web site - http://www.srh.noaa.gov/lub/images/safety/swaw/tx-deaths-1988-2005-wx-pie-graph.gif
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