重叠标签 ggmap

Question

我有一张谷歌地图和一列带文本标签的坐标。预览时，这些标签重叠在一起，因此变得不可读：

library(ggmap)
WPmap <- qmap(c(lon=4.80324, lat=52.40738), zoom = 12,  source = "google")

表格 kaart_rtw:

              Naam      lat     lon
1 Nieuw-Zeelandweg 52.40466 4.80214
2      Portsmuiden 52.39014 4.78554
3     Westhavenweg 52.41602 4.82282
4     Westhavenweg 52.41702 4.82282
5     Westhavenweg 52.41802 4.82282
6         Deccaweg 52.40196 4.83910
7     Coenhavenweg 52.40364 4.86195 

AmsterdamMap + geom_text(data = kaart_rtw, aes(label = kaart_rtw$Naam, x = X, y = Y)) 

有没有办法停止重叠？

- user3346225

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欢迎来到StackOverflow！请阅读有关如何提供一个可复现的示例，包括数据和代码，然后相应地更新您的问题。 - Thomas

我想我只需要稍微调整一下坐标。 - user3346225

Answer 1

如果您想要在不重叠的情况下放置标签，可以考虑尝试ggrepel：

library(ggmap)
install.packages("devtools")
devtools::install_github("slowkow/ggrepel")
library(ggrepel)

df <- read.table(text="Naam lat lon
Nieuw-Zeelandweg 52.40466 4.80214
Portsmuiden 52.39014 4.78554
Westhavenweg 52.41602 4.82282
Westhavenweg 52.41702 4.82282
Westhavenweg 52.41802 4.82282
Deccaweg 52.40196 4.83910
Coenhavenweg 52.40364 4.86195", header = TRUE, strip.white = TRUE)

roads <- get_map(location = c(lon = 4.82824, lat = 52.40738), zoom = 13, 
                 maptype = "roadmap", scale = 2)

ggmap(roads) +
  geom_point(
    data = df,
    aes(x = lon, y = lat),
    alpha = 0.5, fill = "red", size = 4, shape = 21
  ) +
  geom_label_repel(
    data = df,
    aes(x = lon, y = lat, label = df$Naam),
    box.padding = unit(2, "lines")
  ) +
  guides(fill = FALSE, alpha = FALSE)

- Kamil Slowikowski

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ggrepel现在已经上线CRAN，因此可以直接从那里安装。 - Sam Firke

Answer 2

调整坐标可能是一个简单的解决方法，但只有在您有少量观测数据时才适用。以下是一个例子:

df <- read.table(text="Naam lat lon
Nieuw-Zeelandweg 52.40466 4.80214
Portsmuiden 52.39014 4.78554
Westhavenweg 52.41602 4.82282
Westhavenweg 52.41702 4.82282
Westhavenweg 52.41802 4.82282
Deccaweg 52.40196 4.83910
Coenhavenweg 52.40364 4.86195", header = TRUE, strip.white = TRUE)

require(ggmap)
require(ggplot2)

roads <- get_map(location = c(lon = 4.82824, lat = 52.40738), zoom = 13, 
                 maptype = "roadmap", scale = 2)

ggmap(roads) +
  geom_point(data = df, aes(x=lon, y=lat, fill="red", alpha=0.5, label = df$Naam),
             size=4, shape=21) +
  geom_text(data = df, aes(x = lon, y = lat, label = Naam), 
            size = 3, vjust = 0, hjust = -0.1) +
  guides(fill = FALSE, alpha = FALSE)

结果：

- Jaap