Returns the GDAL_METADATA XML string (TIFF tag 42112) embedded in a
GeoTIFF file. Returns NA if the tag is not present.
Examples
# \donttest{
f <- tempfile(fileext = ".tif")
df <- data.frame(x = 1:4, y = rep(1:2, each = 2), band1 = as.double(1:4))
write_tiff(df, f, metadata = "<GDALMetadata></GDALMetadata>")
tiff_metadata(f)
unlink(f)
# }