我如何使用 RStudio 生成各州癌症患病率的热图。我一直只得到一个空地块的 US ma
图书馆（地图项目） 图书馆（ggmap）
us_map <- get_map(location = "united states", zoom = 3)
ggmap(us_map) + geom_density2d(data = state_data_clean, aes(x = Longitude, y = Latitude, color = avg_cancer), alpha = 0.4) + scale_color_gradient(low = "yellow", high = "red", name = "Avg Cancer Prevalence")
ggplot(state_data_clean, aes(x = long, y = lat, group = group, fill = avg_cancer)) + geom_tile() + scale_fill_gradient(low = "yellow", high = "red", name = "Avg Cancer Prevalence") + theme_void() + 坐标图（）