Select a subset of columns from the eBird Basic Dataset (EBD) or the sampling events file. Subsetting the columns can significantly decrease file size.
auk_select(x, select, file, sep = "\t", overwrite = FALSE)auk_ebd or auk_sampling object; reference to file created by
auk_ebd() or auk_sampling().
character; a character vector specifying the names of the
columns to select. Columns should be as they appear in the header of the
EBD; however, names are not case sensitive and spaces may be replaced by
underscores, e.g. "COMMON NAME", "common name", and "common_NAME" are
all valid.
character; output file.
character; the input field separator, the eBird file is tab separated by default. Must only be a single character and space delimited is not allowed since spaces appear in many of the fields.
logical; overwrite output file if it already exists
Invisibly returns the filename of the output file.
if (FALSE) {
# select a minimal set of columns
out_file <- tempfile()
ebd <- auk_ebd(system.file("extdata/ebd-sample.txt", package = "auk"))
cols <- c("latitude", "longitude",
"group identifier", "sampling event identifier",
"scientific name", "observation count",
"observer_id")
selected <- auk_select(ebd, select = cols, file = out_file)
str(read_ebd(selected))
}