将 colorFactor 调色板添加到 mapview 对象

Question

目的是为因子值提供固定颜色。我很难将 colorFactor 比例应用于 mapview 对象。但是，调色板似乎与 zcol 不匹配。

我尝试了以下，类似于传单地图。

library(mapview)

colors <- colorFactor(palette = c("Red", "Green", "Blue"),
                      levels = c("Oberfranken","Mittelfranken", "Unterfranken"))

mapview(franconia, zcol = "district",col.regions=colors)

我收到以下错误消息：

1: In col.regions(nregions) :   Some values were outside the color
scale and will be treated as NA

有什么帮助吗？

以下内容适用于传单，但不使用 mapview。

franconia %>% leaflet() %>% addTiles() %>% addPolygons(fillColor = ~colors(district))

Answer 1

mapview::mapviewColors 似乎可以解决问题：

library(mapview)

colors <- mapviewColors(x=franconia,
                        zcol = "district", 
                        colors = c("Red", "Green", "Blue"),
                        at = c("Oberfranken","Mittelfranken", "Unterfranken"))

mapview(franconia, zcol = "district",col.regions = colors)

将 colorFactor 调色板添加到 mapview 对象

add colorFactor palette to mapview object

r

leaflet

mapview