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https://broadbandusa.maps.arcgis.com/apps/webappviewer/index.html?id=e2b4907376b548f892672ef6afbc0da5
希望在 R 中为一个县创建与此类似的地图。我有每个（FCC、ACS 和 Ookla）的 shapefile，但是当我尝试为新对象创建新填充时，旧填充会被覆盖。有没有办法绘制三个不同的数据集并为每个数据集提供一个图例？