TWP/GNDRAD/C3 - Maintenance activities affected GNDRAD

While maintenance was performed on the SMET anenometer, the GNDRAD instruments were 
inverted. Disregard GNDRAD data during this time.

• Net Radiation, Maxima(net_max)
• Net Radiation, Standard Deviation(net_std)
• lon(lon)
• base time in epoch(base_time)
• Upwelling shortwave hemispheric irradiance, pyranometer, minima(up_short_hemisp_min)
• Upwelling longwave hemispheric irradiance, pyrgeometer, maxima(up_long_hemisp_max)
• Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
  Standard Deviation(up_long_hemisp_std)
• Bit data. See details.(bit_data)
• NET minimum(net_min)
• North Latitude(lat)
• Net Radiation(net)
• Internal voltage(internal_voltage)
• Upwelling (10 meter) Shortwave Hemispheric Irradiance, Ventilated Pyranometer,
  Standard Deviation(up_short_hemisp_std)
• Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer, Maxima(up_short_hemisp_max)
• Upwelling Longwave Hemispheric Irradiance, Pyrgeometer, Minima(up_long_hemisp_min)
• 10 meter Upwelling Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)
• Time offset from base_time(time_offset)
• Data Logger Temperature(logger_temp)
• Surface Infra-Red Temperature, Minima(sfc_ir_temp_min)
• -180.0 - +180.0(alt)
• Surface infra-red temperature(sfc_ir_temp)
• Surface Infra-Red Temperature, Standard Deviation(sfc_ir_temp_std)
• 25 meter Upwelling Shortwave Hemispheric Irradiance, Pyranometer(up_short_hemisp)
• Surface Infra-Red Temperature, Maxima(sfc_ir_temp_max)
• External voltage(external_voltage)

• North Latitude(lat)
• base time in epoch(base_time)
• -180.0 - +180.0(alt)
• Instantaneous Surface Infra-Red Signal(inst_sfc_ir_signal)
• Time offset from base_time(time_offset)
• Instantaneous Upwelling Pyrgeometer Thermopile Pyrgeometer(inst_up_long_hemisp_tp)
• Instantaneous Upwelling Pyrgeometer Dome Thermistor Resistance Pyrgeometer(inst_up_long_dome_resist)
• Instantaneous Upwelling Pyrgeometer Case Thermistor Resistance, Pyrgeometer(inst_up_long_case_resist)
• lon(lon)
• Instantaneous Upwelling Shortwave Hemispheric Irradiance, Pyranometer(inst_up_short_hemisp)
• time_in_seconds_since_volume_start(time)