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You can use the map_data function from the {ggplot2} package to pull data for maps at different levels (“usa,” “state,” “world,” “county”). The data you pull give locations of the borders of geographic polygons like states and counties. For example, you can get the polygon location data for U.S. states by running the following code
百度地图比例尺不对,数据经纬度和地图经纬度对不上
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