Question

我正在尝试制作一张伦敦的插图和一张更大的英国地图。我正在使用包＆＃34; tmap＆＃34;我发现它是一个很好的包装，特别容易使用ggplot2一段时间。但是，有关如何使用tmap生成插图的文档有点不清楚。 reference manual描述了如何使用以下方式生成插图：

    save_tm(...insets_tm = NULL, insets_vp = NULL)

但不清楚第二个命令insets_vp应该如何使用。我只找到一个实例，它实际上提供了使用tmap生成insetmap的建议语法：

    alaska <- tm_shape(shp_alaska) + … print(alaska, vp=viewport(x=.1, 
    y=.15, width=.2, height=.3))

请参阅此处查看source of the above code。这实际上并没有显示美国和阿拉斯加/夏威夷地图的组合方式。至于我自己的编码尝试，我尝试了以下（dplyr，magrittr，rgdal，GISTools，RColorBrewer，tmap都加载了，R vn 3.3.2，RStudio 1.0.136）：

我首先为所有英国（UK_Im_Sec）和伦敦（London_Im_Sec）创建两个tmap对象多边形和点：

UK_Im_Sec<-tm_shape(UKNI_LA_ll, is.master = TRUE)+
tm_borders(lwd=0.25)+
tm_shape(Immobile_residuals)+
tm_dots(col="Sec_Name", style="cat", palette="Set1", title="Socio-economic background (NS-SEC)")+
tm_layout(title="Mapping outlier residuals - non-predicted 'immobility' (Social class)", title.size = 3.0,
    title.position=c("center","TOP"),legend.outside = TRUE,
    legend.outside.position = "right",frame = FALSE)

LDN_Im_Sec<-tm_shape(Immobile_resids_LDN)+
tm_dots(col="Sec_Name", style="cat", palette="Set1", size = 0.25,title="Socio-economic background (NS-SEC)")+
tm_shape(LDN_Poly, is.master = TRUE)+
tm_borders(lwd=0.25)+
tm_text(text="NAME", size = 0.6, auto.placement=TRUE)+
tm_layout("London",title.position = c("center", "BOTTOM"),legend.outside = TRUE, legend.outside.position = "right", frame =  FALSE)

然后我尝试保存一个结合了两个对象的pdf：

save_tmap(UK_Im_Sec,insets_tm = LDN_Im_Sec,filename="ZRMdlNoRg_SEC_-3to-5SDs_ImmobResids_FINAL.pdf", dpi=600)

这将打印pdf，但仅显示英国地图。所以，

我尝试将insets_vp添加到代码中：

save_tmap(UK_Im_Sec,insets_tm = LDN_Im_Sec,insets_vp=UK_Im_Sec, filename="ZRMdlNoRg_SEC_-3to-5SDs_ImmobResids_FINAL.pdf", dpi=600)

但是这会产生以下错误代码：

    Error in save_tmap(UK_Im_Sec, insets_tm = LDN_Im_Sec, insets_vp = UK_Im_Sec,  : 
    Insets and/or its viewports not in the correct format

然后我尝试将print（x，view =（x =，y =，h =，w =）的建议语法与insets_vp结合使用，如下所示：

save_tmap(UK_Im_Sec,insets_tm = LDN_Im_Sec,insets_vp=viewport(x=2, y=.15, width=.2, height=.3), filename="ZRMdlNoRg_SEC_-3to-5SDs_ImmobResids_FINAL.pdf", dpi=600)
Error in inherits(insets_vp, "viewport") : 
could not find function "viewport"

我知道其他人在其他软件包中生成嵌入式地图时遇到了困难，并且已经有其他软件包已经被问及解决了问题，特别是在ggplot中（由于限制我无法链接到问题）在链接上），但据我所知，这个特定的tmap问题没有任何内容。

这是我在这里的第一个问题，所以对于提出问题时的任何错误表示歉意。

Answer 1

您需要加载grid包。所以，这应该工作

library(grid)
save_tmap(UK_Im_Sec,insets_tm = LDN_Im_Sec,insets_vp=viewport(x=2, y=.15, width=.2, height=.3), filename="ZRMdlNoRg_SEC_-3to-5SDs_ImmobResids_FINAL.pdf", dpi=600)

我将很快通过save_tmap示例更新美国的等值线演示。

Answer 2

tmap demo documentation中的最后一张图表有阿拉斯加和夏威夷的插图。下面是代码，我刚刚删除了填充变量：

library("readxl")
library("maptools")
library("grid")
library("tmap")
library("tmaptools")

# function to obtain US county shape
get_US_county_2010_shape <- function() {
  dir <- tempdir()
  download.file("http://www2.census.gov/geo/tiger/GENZ2010/gz_2010_us_050_00_20m.zip", destfile = file.path(dir, "gz_2010_us_050_00_20m.zip"))
  unzip(file.path(dir, "gz_2010_us_050_00_20m.zip"), exdir = dir)
  read_shape(file.path(dir, "gz_2010_us_050_00_20m.shp"))
}

# obtain US county shape
US <- get_US_county_2010_shape()

# split shape 
US_cont <- US[!(US$STATE %in% c("02","15","72")),]  
US_AK <- US[US$STATE == "02", ]
US_HI <- US[US$STATE == "15",]

# create state boundaries
US_states <- unionSpatialPolygons(US_cont, IDs=US_cont$STATE)

设置shapefile后，这里是将视口窗口添加到绘图中的位置：

# change back to the plotting mode
tmap_mode("plot")

# plot contiguous US
tm_shape(US_cont, projection=2163) +
  tm_polygons(border.col = "grey50", border.alpha = .5, title = "", showNA = TRUE) +
  tm_shape(US_states) +
  tm_borders(lwd=1, col = "black", alpha = .5) +
  tm_credits("Data @ Unites States Department of Agriculture\nShape @ Unites States Census Bureau", position = c("right", "bottom")) +
  tm_layout(title.position = c("center", "top"), 
            legend.position = c("right", "bottom"), 
            frame = FALSE, 
            inner.margins = c(0.1, 0.1, 0.05, 0.05))

# Alaska inset
m_AK <- tm_shape(US_AK, projection = 3338) +
  tm_polygons(border.col = "grey50", border.alpha = .5, breaks = seq(10, 50, by = 5)) +
  tm_layout("Alaska", legend.show = FALSE, bg.color = NA, title.size = 0.8, frame = FALSE)

# Hawaii inset
m_HI <- tm_shape(US_HI, projection = 3759) +
  tm_polygons(border.col = "grey50", border.alpha = .5, breaks=seq(10, 50, by = 5)) +
  tm_layout(legend.show = FALSE, bg.color=NA, title.position = c("LEFT", "BOTTOM"), title.size = 0.8, frame=FALSE)

# print insets
print(m_AK, vp=viewport(x= 0.15, y= 0.15, width= 0.3, height= 0.3))
print(m_HI, vp=viewport(x= 0.4, y= 0.1, width= 0.2, height= 0.1))

来源：我已经从https://github.com/mtennekes/tmap/tree/master/demo/USChoropleth

改编了这个

使用R

2 个答案: