sf map 用 inter_join 添加缺失值

Question

我有一个技术问题要问你。

    read_sf("map.shp")  %>% mutate(Groups = as.factor(Groups)) %>% 
        mutate(Groups = factor(Groups, levels = c(paste0(1:23)))) %>%
        left_join(data, by = "cities_code") %>%
# Show map with cities border
      ggplot() +
        geom_sf(aes(fill = Groups),  size = 0.4) +
# Color the different Groups, here 23 colors
        stat_sf_coordinates(aes(size = observation)) +
# Put point with the size of my number of observations
        scale_radius(range = c(1, 6)) +
        geom_sf(fill = "transparent", color = "gray20", size = 1, data = . %>% group_by(Groups) %>% summarise()) +
# Show the border of my Groups
        theme_bw()

这张地图正是我想要的。它代表一个州的城市，按地区细分 ("Groups")。但是在我的map.shp和我的data之间我有50个城市的差异，因为这些城市没有观察（所以没有“stat_sf_coordinates(aes(size = observation))”的意义）。

我能找到与anti_join(data, by = "cities_code")的区别。我想要相同的地图，但请将缺少的城市标为红色。

谢谢

Answer 1

很简单：

        read_sf("map.shp")  %>% mutate(Groups = as.factor(Groups)) %>% 
            mutate(Groups = factor(Groups, levels = c(paste0(1:23)))) %>%
            left_join(data, by = "cities_code") %>%
          ggplot() +
            geom_sf(aes(fill = Groups),  size = 0.4) +
            stat_sf_coordinates(aes(size = observation)) +
            scale_radius(range = c(1, 6)) +
##

geom_sf(fill = "red", color = "gray40", size = 0.4, data = . %>% anti_join(data, by = "cities_code")) +

##
            geom_sf(fill = "transparent", color = "gray20", size = 1, data = . %>% group_by(Groups) %>% summarise()) +
            theme_bw()

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