tm_raster fails for rasters with no values #529
Description
If a raster layer that contains only NA values is written to disk and then read back into R, the following error is thrown when plotting with tm_raster:
Error in from$toXYZ(color, from.ref.white) :
ncol(Lab) == 3L || length(Lab) == 3 is not TRUE This only seems to occur if the raster is read from disk, and only if a palette is specified.
library(raster)
#> Loading required package: sp
library(tmap)
r <- raster(matrix(NA, 2, 2), crs='+init=epsg:4326')
# not reading from disk
tm_shape(r) + tm_raster(palette = "inferno")
#> Linking to GEOS 3.8.1, GDAL 3.1.1, PROJ 6.3.1writeRaster(r, f <- tempfile(fileext='.tif'))
r <- raster(f)
# from disk, with palette specified
tm_shape(r) + tm_raster(palette = "inferno")
#> Error in from$toXYZ(color, from.ref.white): ncol(Lab) == 3L || length(Lab) == 3 is not TRUE
# from disk, no palette
tm_shape(r) + tm_raster()Created on 2020-12-07 by the reprex package (v0.3.0)
Session info
devtools::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#> setting value
#> version R version 4.0.2 (2020-06-22)
#> os macOS Mojave 10.14.3
#> system x86_64, darwin17.0
#> ui X11
#> language (EN)
#> collate en_AU.UTF-8
#> ctype en_AU.UTF-8
#> tz Australia/Melbourne
#> date 2020-12-07
#>
#> ─ Packages ───────────────────────────────────────────────────────────────────
#> package * version date lib source
#> abind 1.4-5 2016-07-21 [1] CRAN (R 4.0.0)
#> assertthat 0.2.1 2019-03-21 [1] CRAN (R 4.0.0)
#> base64enc 0.1-3 2015-07-28 [1] CRAN (R 4.0.0)
#> callr 3.5.1 2020-10-13 [1] CRAN (R 4.0.2)
#> class 7.3-17 2020-04-26 [1] CRAN (R 4.0.2)
#> classInt 0.4-3 2020-04-07 [1] CRAN (R 4.0.0)
#> cli 2.1.0 2020-10-12 [1] CRAN (R 4.0.2)
#> codetools 0.2-16 2018-12-24 [1] CRAN (R 4.0.2)
#> crayon 1.3.4 2017-09-16 [1] CRAN (R 4.0.0)
#> crosstalk 1.1.0.1 2020-03-13 [1] CRAN (R 4.0.0)
#> curl 4.3 2019-12-02 [1] CRAN (R 4.0.0)
#> DBI 1.1.0 2019-12-15 [1] CRAN (R 4.0.0)
#> desc 1.2.0 2018-05-01 [1] CRAN (R 4.0.0)
#> devtools 2.3.1 2020-07-21 [1] CRAN (R 4.0.2)
#> dichromat 2.0-0 2013-01-24 [1] CRAN (R 4.0.0)
#> digest 0.6.27 2020-10-24 [1] CRAN (R 4.0.2)
#> dplyr 1.0.2 2020-08-18 [1] CRAN (R 4.0.2)
#> e1071 1.7-4 2020-10-14 [1] CRAN (R 4.0.2)
#> ellipsis 0.3.1 2020-05-15 [1] CRAN (R 4.0.0)
#> evaluate 0.14 2019-05-28 [1] CRAN (R 4.0.0)
#> fansi 0.4.1 2020-01-08 [1] CRAN (R 4.0.0)
#> fs 1.5.0 2020-07-31 [1] CRAN (R 4.0.2)
#> generics 0.1.0 2020-10-31 [1] CRAN (R 4.0.2)
#> glue 1.4.2 2020-08-27 [1] CRAN (R 4.0.2)
#> highr 0.8 2019-03-20 [1] CRAN (R 4.0.0)
#> htmltools 0.5.0 2020-06-16 [1] CRAN (R 4.0.0)
#> htmlwidgets 1.5.2 2020-10-03 [1] CRAN (R 4.0.2)
#> httr 1.4.2 2020-07-20 [1] CRAN (R 4.0.2)
#> KernSmooth 2.23-17 2020-04-26 [1] CRAN (R 4.0.2)
#> knitr 1.30 2020-09-22 [1] CRAN (R 4.0.2)
#> lattice 0.20-41 2020-04-02 [1] CRAN (R 4.0.2)
#> leafem 0.1.3 2020-07-26 [1] CRAN (R 4.0.2)
#> leaflet 2.0.3 2019-11-16 [1] CRAN (R 4.0.2)
#> leafsync 0.1.0 2019-03-05 [1] CRAN (R 4.0.0)
#> lifecycle 0.2.0 2020-03-06 [1] CRAN (R 4.0.0)
#> lwgeom 0.2-5 2020-06-12 [1] CRAN (R 4.0.0)
#> magrittr 1.5 2014-11-22 [1] CRAN (R 4.0.0)
#> memoise 1.1.0 2017-04-21 [1] CRAN (R 4.0.0)
#> mime 0.9 2020-02-04 [1] CRAN (R 4.0.0)
#> pillar 1.4.6 2020-07-10 [1] CRAN (R 4.0.2)
#> pkgbuild 1.1.0 2020-07-13 [1] CRAN (R 4.0.2)
#> pkgconfig 2.0.3 2019-09-22 [1] CRAN (R 4.0.0)
#> pkgload 1.1.0 2020-05-29 [1] CRAN (R 4.0.0)
#> png 0.1-7 2013-12-03 [1] CRAN (R 4.0.0)
#> prettyunits 1.1.1 2020-01-24 [1] CRAN (R 4.0.0)
#> processx 3.4.4 2020-09-03 [1] CRAN (R 4.0.2)
#> ps 1.4.0 2020-10-07 [1] CRAN (R 4.0.2)
#> purrr 0.3.4 2020-04-17 [1] CRAN (R 4.0.0)
#> R6 2.5.0 2020-10-28 [1] CRAN (R 4.0.2)
#> raster * 3.4-5 2020-11-14 [1] CRAN (R 4.0.2)
#> RColorBrewer 1.1-2 2014-12-07 [1] CRAN (R 4.0.0)
#> Rcpp 1.0.5 2020-07-06 [1] CRAN (R 4.0.2)
#> remotes 2.2.0 2020-07-21 [1] CRAN (R 4.0.2)
#> rgdal 1.5-18 2020-10-13 [1] CRAN (R 4.0.2)
#> rlang 0.4.8 2020-10-08 [1] CRAN (R 4.0.2)
#> rmarkdown 2.5 2020-10-21 [1] CRAN (R 4.0.2)
#> rprojroot 2.0.2 2020-11-15 [1] CRAN (R 4.0.2)
#> sessioninfo 1.1.1 2018-11-05 [1] CRAN (R 4.0.0)
#> sf * 0.9-6 2020-09-13 [1] CRAN (R 4.0.2)
#> sp * 1.4-4 2020-10-07 [1] CRAN (R 4.0.2)
#> stars 0.4-3 2020-07-08 [1] CRAN (R 4.0.2)
#> stringi 1.5.3 2020-09-09 [1] CRAN (R 4.0.2)
#> stringr 1.4.0 2019-02-10 [1] CRAN (R 4.0.0)
#> testthat 3.0.0 2020-10-31 [1] CRAN (R 4.0.2)
#> tibble 3.0.4 2020-10-12 [1] CRAN (R 4.0.2)
#> tidyselect 1.1.0 2020-05-11 [1] CRAN (R 4.0.0)
#> tmap * 3.2 2020-09-15 [1] CRAN (R 4.0.2)
#> tmaptools 3.1 2020-07-01 [1] CRAN (R 4.0.2)
#> units 0.6-7 2020-06-13 [1] CRAN (R 4.0.0)
#> usethis 1.6.1 2020-04-29 [1] CRAN (R 4.0.0)
#> vctrs 0.3.4 2020-08-29 [1] CRAN (R 4.0.2)
#> viridisLite 0.3.0 2018-02-01 [1] CRAN (R 4.0.0)
#> withr 2.3.0 2020-09-22 [1] CRAN (R 4.0.2)
#> xfun 0.19 2020-10-30 [1] CRAN (R 4.0.2)
#> XML 3.99-0.5 2020-07-23 [1] CRAN (R 4.0.2)
#> xml2 1.3.2 2020-04-23 [1] CRAN (R 4.0.0)
#> yaml 2.2.1 2020-02-01 [1] CRAN (R 4.0.0)
#>
#> [1] /Library/Frameworks/R.framework/Versions/4.0/Resources/library