suppressPackageStartupMessages(library(sf))
suppressPackageStartupMessages(library(units))
if (utils::packageVersion("units") >= "0.5-0")
units_options(auto_convert_names_to_symbols = FALSE)
ll = st_crs(4326)
sf:::crs_parameters(ll)$ud_unit
u = names(sf:::udunits_from_proj)
unrecognized = NULL
out = sapply(u, function(x) {
p4s = paste0("+proj=laea +units=", x)
cat(x, ": ")
ret = try(sf:::crs_parameters(st_crs(p4s))$ud_unit, silent = TRUE)
if (! inherits(ret, "try-error"))
print(ret)
else
unrecognized = c(unrecognized, x)
})
if (length(unrecognized))
print(paste("unrecognized units:", paste(unrecognized, collapse = ", "), ": older GDAL version?"))
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