HDF5 file, superblock version 2
group /
	attribute Conventions = "CF-1.8"
	attribute author = "hagen.telg@noaa.gov"
	attribute comments = "The \"time\" coordinate was re-indexed to the full minute by back-filling the nearest valid data value within the following minute.The data values have not undergone any processing other than what the Vaisala software has applied. In addition, no QC has been applied other than a visual inspection for impossible values or obvious errors."
	attribute input_files = "L2_GWN_202104040000_p1950285.nc"
	attribute institution = "NOAA/GML/GRAD"
	attribute serial_number = "p1950285"
	attribute site_latitude = "34.254700"
	attribute site_longitude = "-89.872902"
	attribute site_name = "gwn"
	attribute source = "Vaisala CL51 ceilometer"
	attribute title = "Ceilometer cloud product"
	attribute version = "1.3.1"
dataset /backscatter_profile: float32, shape (1440, 1540)
	attribute _FillValue = nan
	attribute comments = "Range-corrected-scattering"
	attribute long_name = "2-D ceilometer signal backscatter profile."
	attribute units = "10e-9 m^-1 sr^-1"
dataset /cloud_data: float32, shape (1440, 3)
	attribute _FillValue = nan
	attribute cloud_base_1 = "First cloud base height or vertical visibility if cloud_status=4"
	attribute cloud_base_2 = "Second cloud base height or highest received signal if cloud_status=4"
	attribute cloud_base_3 = "Third cloud base height"
	attribute comments = "A 2D array containing all three cloud bases at each timestep. -999 if no significant signal."
	attribute long_name = "Cloud base heights."
	attribute units = "m"
dataset /cloud_layer: int8, shape (3)
	attribute axis = "Z"
	attribute long_name = "Cloud layer index"
	attribute positive = "up"
	attribute units = "1"
// cloud_layer: first 1, last 3, count 3
dataset /cloud_status: float32, shape (1440)
	attribute _FillValue = nan
	attribute comments = "When cloud_status=4 there is an optically thick cloud that obscures the signal. Therefore it is not possible to discern additional cloud layers above it so the vertical visibility and highest signal are reported instead."
	attribute flag_0 = "No significant backscatter."
	attribute flag_1 = "One cloud layer detected."
	attribute flag_2 = "Two cloud layers detected."
	attribute flag_3 = "Three cloud layers detected."
	attribute flag_4 = "Full obscuration/vertical visibility mode. First cloud_base will report vertical visibility and second cloud_base will report highest signal"
	attribute flag_values = "0,1,2,3,4"
	attribute long_name = "Cloud detection status."
	attribute units = "1"
dataset /instrumen_reported_time: int64, shape (1440)
	attribute calendar = "proleptic_gregorian"
	attribute comments = "Timestamp that was reported by the instrument. The \"time\" coordinate was re-indexed to the full minute (see global comments)."
	attribute long_name = "Instrument reported time"
	attribute units = "seconds since 1900-01-01T00:00:00+00:00"
dataset /range: int32, shape (1540)
	attribute axis = "Z"
	attribute long_name = "Distance from ground"
	attribute positive = "up"
	attribute standard_name = "distance"
	attribute units = "m"
// range: first 10, last 15400, count 1540
dataset /time: int64, shape (1440)
	attribute calendar = "proleptic_gregorian"
	attribute units = "seconds since 1900-01-01T00:00:00+00:00"