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20 hours ago •
r-tmap
r-tmap
tm_raster fails for rasters with no values
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$toXYZ(color, from.ref.white) :
ncol(Lab) == 3L || length(Lab) == 3 is not TRUE
This only seems to occur if the raster is read from disk, and only if a palette is specified.
library(raster)
#> Loading required package: sp
library(tmap)
r <- raster(matrix(NA, 2, 2), crs='+init=epsg:4326')
# not reading from disk
tm_shape(r) + tm_raster(palette = "inferno")
#> Linking to GEOS 3.8.1, GDAL 3.1.1, PROJ 6.3.1
writeRaster(r, f <- tempfile(fileext='.tif'))
r <- raster(f)
# from disk, with palette specified
tm_shape(r) + tm_raster(palette = "inferno")
#> Error in from$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()
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