Map Symbols and Size Legends for leaflet

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The leaflet package in R has built-in functionality for creating color encoded geometries and annotating with color legends. Support is lacking in the area of providing the ability to encode data with sizes or symbology except for the case of circle markers. Size and symbology are an important part of data visualization on a map. Using the leaflegend package, you can add both to your leaflet maps without adding external css or javascript.

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