Question

我想将包含多边形的shapefile添加到我使用Choroplethr包创建的等值区域图中。使用以下代码创建了等值区域图：

choro=county_choropleth(Change, title= "WeeklyChange", state_zoom = continental_us,reference_map = F)+ scale_fill_manual(values=c("-3"="red4","-2"="red3","-1"="red1", "0"="snow","1"="greenyellow","2"="green","3"="green3"))

plot(choro)

gold= readShapePoly("Gold") gold_df= fortify(gold) land= ggplot(data= gold_df,aes(x=long, y= lat, group=group))+ geom_polygon(colour="gold3")

plot(gold)

两个对象都显示正确，但是我无法在等值线图上堆叠黄金图。 Choropleth and gold map

提前致谢！

Answer 1

感谢Ari Lamstein帮助我。以下是添加多边形的代码

# Create Choropleth Map
`choro=county_choropleth(Change, title= "WeeklyChange",
state_zoom = continental_us,reference_map = F)+
scale_fill_manual(values=c("-3"="red4","-2"="red3","-1"="red1",
"0"="snow","1"="greenyellow","2"="green","3"="green3"))`

`#Import shapefile polygons
gold= readShapePoly("Gold")`

`#Create dataframe for ggplot
gold_df= fortify(gold)`

`#Combine Choropleth Map and shapefile dataframe
choro+geom_polygon(data= gold_df,aes(x=long, y= lat,group=group),fill="gold3")`

将shapefile多边形添加到等值线图（Choroplethr）

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