character vector of subdataset names that can be used in
gdal_translate.
Details
Currently, this only returns the subdataset names of HDF4,
HDF5, and NetCDF files, assuming they follow the
SUBDATASET_n_NAME convention. This can be used with
gdal_translate to extract a single subdataset (or with
gdal_translate(...,sd_index=n)
This function assumes the user has a working GDAL on their
system. If the "gdalUtils_gdalPath" option has been set
(usually by gdal_setInstallation), the GDAL found in that
path will be used. If nothing is found,
gdal_setInstallation will be executed to attempt to find a
working GDAL.