DQRID : D100616.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
12/03/2009210706/15/20102143Suspect
more
Subject:
NSA/CEIL/C1 - Small gaps in data
DataStreams:nsaceilC1.b1
Description:
When the ceilometer was replaced, small gaps in the netCDF files occurred due to the 
presence of '?' characters in the backscatter and header records of the raw data that could 
not be ingested. It is unknown whether this was caused by a poor CPU board or 
incompatibilities with the computer configuration (hyper-threading). The problem was corrected when 
the instrument and computer were both replaced. 

During this period, approximately 3% of data are missing each hour due to this problem.
Suggestions: 
Measurements:nsaceilC1.b1:
  • window_contamination
  • alt_highest_signal
  • detection_status
  • receiver_sensitivity
  • laser_temperature
  • second_cbh
  • backscatter
  • base_time
  • vertical_visibility
  • third_cbh
  • measurement_parameters
  • first_cbh
  • tilt_angle
  • time_offset
  • background_light
  • status_flag
  • laser_pulse_energy
  • status_string
  • range
  • sum_backscatter
more

Close this window