r - 如何在 R 中使用 tmap 绘制 GeoTIFF？

Question

简单的plotRGB 会导致original image，而使用tmap 绘图则会返回only a blue-shaded image。我做错了什么？

原始图片

蓝色阴影图像

代码片段:

library(raster)
library(tmap)
library(rnaturalearth)

ne_download(scale = 50, type = 'HYP_50M_SR_W', category = 'raster', destdir = getwd())
rst <- brick("HYP_50M_SR_W/HYP_50M_SR_W.tif")

plotRGB(rst) # works

tmap_mode("plot")
tm_shape(rst) + tm_rgb() # does not work

使用:R 版本 3.5.1、RStudio 1.1.456、tmap 2.1-1、raster 2.6-7、rnaturalearth 0.1.0

Answer 1

现在可能可以正常工作，但请注意警告:

library(raster)
#> Loading required package: sp
library(tmap)
#> Warning: package 'tmap' was built under R version 3.5.2
library(rnaturalearth)
#> Warning: package 'rnaturalearth' was built under R version 3.5.2

ne_download(scale = 50, type = 'HYP_50M_SR_W', category = 'raster', destdir = getwd())
rst <- brick("HYP_50M_SR_W/HYP_50M_SR_W.tif")

plotRGB(rst)

tm_shape(rst) + tm_rgb()
#> Raster object has 58320000 (5400 by 10800) cells, which is larger than 1e+07, the maximum size determined by the option max.raster. Therefore, the raster will be shown at a decreased resolution of 1e+07 cells. Set tmap_options(max.raster = c(plot = 58320000, view = 58320000)) to show the whole raster.
#> Linking to GEOS 3.6.1, GDAL 2.2.3, PROJ 4.9.3

^{由reprex package于2019年1月30日创建(v0.2.1)}

devtools::session_info()
#> - Session info ----------------------------------------------------------
#>  setting  value                       
#>  version  R version 3.5.1 (2018-07-02)
#>  os       Windows 7 x64 SP 1          
#>  system   x86_64, mingw32             
#>  ui       RTerm                       
#>  language (EN)                        
#>  collate  English_United States.1252  
#>  ctype    English_United States.1252  
#>  tz       Europe/Berlin               
#>  date     2019-01-30                  
#> 
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