NSA/TSI/C1 - camera lens covered

The shadowband was not properly masking the sun so the camera lens was covered on 4/13 to 
prevent damage to the CCD. On 4/20, the mirror was blown off by a snow storm and the 
instrument was brought inside for repair. The mirror was replaced, the lens uncovered, and 
the instrument reinstalled.

• region.zenith.count.opaque
• count.sub.proczen
• count.sub.horz
• Cloud amount, thin (percent)(percent.thin)
• count.opaque
• count.thin
• region.horizon.count.opaque
• region.sun.count
• region.horizon.count.thin
• count.unknown
• region.horizon.count
• region.zenith.count
• region.sun.count.thin
• region.zenith.count.thin
• Sunshine Meter(sunny)
• sun.strength
• count.box
• region.sun.count.opaque
• count.sky
• count.mask
• Cloud amount, opaque (percent)(percent.opaque)

NSA/TSI/C1 - shadowband misaligned

At several times during this period the shadowband did not mask the sun because the mirror 
was not properly secured. Attempts were made to align the mirror on 4/2, 4/3, and 4/10.

• region.zenith.count.opaque
• count.sub.proczen
• count.sub.horz
• Cloud amount, thin (percent)(percent.thin)
• count.opaque
• count.thin
• region.horizon.count.opaque
• region.sun.count
• region.horizon.count.thin
• count.unknown
• region.horizon.count
• region.zenith.count
• region.sun.count.thin
• region.zenith.count.thin
• sun.strength
• count.box
• region.sun.count.opaque
• count.sky
• count.mask
• Cloud amount, opaque (percent)(percent.opaque)

NSA/TSI/C1 - frost/condensation in lens

The sky image appeared hazy and was corrected by cleaning the neutral-density filter and 
lens of the camera. The determination of cloud fraction may be affected.

• Cloud amount, thin (percent)(percent.thin)
• Cloud amount, opaque (percent)(percent.opaque)

NSA/TSI/C1 - Mirror frozen

The mirror was not rotating so the shadowband was not masking the sun. This appears to 
have been caused by snow that was melted by the mirror heater and then re-frozen by high, 
cold winds.

• region.zenith.count.opaque
• region.zenith.count
• region.sun.count.thin
• region.zenith.count.thin
• Cloud amount, thin (percent)(percent.thin)
• count.opaque
• count.thin
• region.sun.count.opaque
• count.sky
• region.horizon.count.opaque
• region.sun.count
• Cloud amount, opaque (percent)(percent.opaque)
• region.horizon.count.thin
• region.horizon.count

NSA/TSI/C1 - Ingest Problem

A minor error was made with diagnostic metadata attribute sunny_thresh when the TSI ingest 
was updated.

• base_time

NSA/TSI/C1 - Water on lens

After a rain episode, drops of water collected on the lens window causing the cloud 
fraction values to be suspect.

To prevent this, a drip edge was formed around the bottom of the enclosure with thick 
electrical or splicing tape.

• region.zenith.count.opaque
• region.zenith.count
• region.zenith.count.thin
• Cloud amount, thin (percent)(percent.thin)
• count.opaque
• count.thin
• count.sky
• Cloud amount, opaque (percent)(percent.opaque)

NSA/TSI/C1 - Mirror contamination

The surface of the chrome mirror was soiled causing the cloud fraction determination to be 
unreliable.

• Cloud amount, thin (percent)(percent.thin)
• count.opaque
• count.thin
• Cloud amount, opaque (percent)(percent.opaque)

NSA/TSI/C1 - Reprocessed and Corrected: Recalibration

DATA REPROCESSED and CORRECTED: 

The sky filter thresholds were not set correctly during this time. The data has been 
re-filtered and processed to create the correct data.

The data were archived November 2016. Please retrieve the reprocessed data for use in your 
analysis.

You may find these data using the ARM Discovery tool at the following link:
http://www.archive.arm.gov/discovery/#v/results/s/finst::tsi/fsite::nsa/ffac::nsa.C1


ORIGINAL DQR CATEGORY:	Red (Incorrect)

REPROCESSED and CORRECTED DATA ARCHIVED:2016-11

REPROCESS IDENTIFICATION NUMBER: RID 924

---------------------------------------------------
--- ORIGINAL DQR DESCRIPTION ---
---------------------------------------------------
The processed image and cloud fraction determination were incorrect because the clear/thin 
threshold was set too high.

• region.zenith.count.opaque
• region.sun.count.thin
• region.zenith.count.thin
• Cloud amount, thin (percent)(percent.thin)
• count.opaque
• count.thin
• region.sun.count.opaque
• region.horizon.count.opaque
• count.mask
• Cloud amount, opaque (percent)(percent.opaque)
• region.horizon.count.thin

NSA/TSI/C1/X1 - data processing problem

Values of count_opaque and count_thin are reals but should be integers  (units = pixels).

• count.opaque
• count.thin

NSA/TSI/C1 - Reprocessing Notice (RID 951)

See below for details of reprocessing that was completed on 20140922.  Original 
DQR category: 5 (Transparent - Does not affect quality).

-----------------------------------------------------------


The units of global attributes region_sun_radius and region_zenith_radius should be 
degrees, not pixels.

• base_time

NSA/TSI/C1 - Camera misaligned

The camera lens was not centered over the middle of mirror. The position of the camera 
enclosure was adjusted.

• region.zenith.count.opaque
• count.sub.proczen
• count.sub.horz
• count.opaque
• Cloud amount, thin (percent)(percent.thin)
• count.thin
• region.horizon.count.opaque
• region.sun.count
• region.horizon.count.thin
• count.unknown
• region.horizon.count
• region.zenith.count
• region.sun.count.thin
• region.zenith.count.thin
• count.box
• region.sun.count.opaque
• count.sky
• count.mask
• Cloud amount, opaque (percent)(percent.opaque)

NSA/TSI/C1 - Obstruction

The electrical tape serving as a drip edge for the camera housing came loose and blocked 
the view of the camera.

• region.zenith.count.opaque
• region.sun.count.thin
• region.zenith.count.thin
• Sunshine Meter(sunny)
• Cloud amount, thin (percent)(percent.thin)
• count.opaque
• sun.strength
• region.sun.count.opaque
• count.sky
• region.horizon.count.opaque
• count.mask
• Cloud amount, opaque (percent)(percent.opaque)
• region.horizon.count.thin

NSA/TSI/C1 - Obstruction

The electrical tape serving as a drip edge for the camera housing came loose and was in 
the zenith view of the camera.

• region.zenith.count.opaque
• region.zenith.count.thin
• Cloud amount, thin (percent)(percent.thin)
• count.opaque
• count.sky
• Cloud amount, opaque (percent)(percent.opaque)

NSA/TSI/C1 - Shadowband misalignment

The shadowband was slightly misaligned. When the TSI was reinstalled after the Arctic 
night, communication with the mirror control board was not re-established and the time of the 
board's RTC was 56m 55s slow.

• region.zenith.count.opaque
• region.sun.count.thin
• region.zenith.count.thin
• Cloud amount, thin (percent)(percent.thin)
• count.opaque
• count.thin
• region.sun.count.opaque
• count.sky
• region.horizon.count.opaque
• Cloud amount, opaque (percent)(percent.opaque)
• region.horizon.count.thin

NSA/TSI/C1 - Communication

A software communication error occurred with the camera. The problem was corrected by 
power-cycling the instrument.

• region.zenith.count.opaque
• count.sub.horz
• count.thin
• base_time
• region.horizon.count.opaque
• region.sun.count
• region.horizon.count.thin
• North latitude(lat)
• region.sun.count.thin
• solar.altitude
• sun.strength
• count.box
• region.sun.count.opaque
• count.mask
• Cloud amount, opaque (percent)(percent.opaque)
• count.sub.proczen
• solar.azimuth
• East longitude(lon)
• count.opaque
• Cloud amount, thin (percent)(percent.thin)
• count.unknown
• Altitude above mean sea level(alt)
• time
• region.horizon.count
• time_offset
• region.zenith.count
• Sunshine Meter(sunny)
• region.zenith.count.thin
• count.sky

NSA/TSI/C1 - frost on lens

The camera lens window was covered with frost because the thermal pad in camera housing 
was not powered on.

• region.zenith.count.opaque
• Cloud amount, thin (percent)(percent_thin)
• region_horizon_count_opaque
• Cloud amount, thin (percent)(percent.thin)
• count_sky
• count.opaque
• count.thin
• region_sun_count_opaque
• count_opaque
• region_zenith_count_thin
• region_horizon_count_thin
• region.horizon.count.opaque
• region.horizon.count.thin
• count_thin
• region.sun.count.thin
• region.zenith.count.thin
• Cloud amount, opaque (percent)(percent_opaque)
• region_sun_count_thin
• region.sun.count.opaque
• count.sky
• Cloud amount, opaque (percent)(percent.opaque)
• region_zenith_count_opaque

NSA/TSI/C1 - Reprocess: Sky filter thresholds

The sky filter thresholds are incorrect causing poor fractional cloud cover values.

The cldmask images and fractional sky cover values will be reprocessed by changing the sky 
filter thresholds thin_thresh from 45 to 50 and opaque_thresh from 70 to 90.

• region.zenith.count.opaque
• Cloud amount, thin (percent)(percent_thin)
• region_horizon_count_opaque
• Cloud amount, thin (percent)(percent.thin)
• count_sky
• count.opaque
• count.thin
• region_sun_count_opaque
• count_opaque
• region_zenith_count_thin
• region_horizon_count_thin
• region.horizon.count.opaque
• region.horizon.count.thin
• count_thin
• region.sun.count.thin
• region.zenith.count.thin
• Cloud amount, opaque (percent)(percent_opaque)
• region_sun_count_thin
• region.sun.count.opaque
• count.sky
• Cloud amount, opaque (percent)(percent.opaque)
• region_zenith_count_opaque

NSA/TSI/C1 - Condensation on lens

The images and fractional sky cover values are affected by moisture inside the camera 
housing. The desiccant was added.

• region.zenith.count.opaque
• count.sub.horz
• Cloud amount, thin (percent)(percent_thin)
• count_sky
• count.thin
• region_sun_count_opaque
• region_zenith_count_thin
• region_horizon_count_thin
• region.horizon.count.opaque
• region.sun.count
• region.horizon.count.thin
• region.sun.count.thin
• region_zenith_count
• region_sun_count_thin
• region_sun_count
• region.sun.count.opaque
• Cloud amount, opaque (percent)(percent.opaque)
• region_zenith_count_opaque
• region_horizon_count_opaque
• count.opaque
• Cloud amount, thin (percent)(percent.thin)
• count_opaque
• region.horizon.count
• count_thin
• region.zenith.count
• region.zenith.count.thin
• Cloud amount, opaque (percent)(percent_opaque)
• count_sub_horz
• count.sky
• region_horizon_count

NSA/ECOR/TSI/C1/E10 - Data Missing

Site data systems were being upgraded during this time.

• count.sub.horz
• Cloud amount, thin (percent)(percent_thin)
• count_sky
• count.thin
• qc_count_sky
• region_sun_count_opaque
• region.sun.count
• qc_percent_opaque
• region.sun.count.thin
• count_sub_proczen
• region_zenith_count
• solar.altitude
• qc_sunny
• region.sun.count.opaque
• qc_region_zenith_count_thin
• count.mask
• Cloud amount, opaque (percent)(percent.opaque)
• count.sub.proczen
• solar_altitude
• qc_percent_thin
• Cloud amount, thin (percent)(percent.thin)
• qc_count_sub_horz
• qc_solar_azimuth
• Altitude above mean sea level(alt)
• count_thin
• time
• qc_count_mask
• count.sky
• qc_time
• region_horizon_count
• region.zenith.count.opaque
• qc_count_sub_proczen
• qc_region_horizon_count_opaque
• base_time
• qc_region_sun_count
• region_zenith_count_thin
• region.horizon.count.opaque
• region_horizon_count_thin
• region.horizon.count.thin
• North latitude(lat)
• count_mask
• qc_region_zenith_count_opaque
• region_sun_count_thin
• region_sun_count
• qc_region_zenith_count
• sun.strength
• count.box
• qc_solar_altitude
• qc_region_horizon_count_thin
• region_zenith_count_opaque
• solar.azimuth
• region_horizon_count_opaque
• East longitude(lon)
• count.opaque
• count_box
• qc_region_sun_count_thin
• qc_count_opaque
• count_opaque
• qc_region_horizon_count
• qc_sun_strength
• count.unknown
• region.horizon.count
• time_offset
• region.zenith.count
• solar_azimuth
• region.zenith.count.thin
• Sunshine Meter(sunny)
• qc_count_thin
• Cloud amount, opaque (percent)(percent_opaque)
• qc_count_unknown
• qc_region_sun_count_opaque
• sun_strength
• count_sub_horz
• count_unknown
• qc_count_box

NSA/TSI/C1 - Re-installation

The TSI required maintenance and configuration after being re-installed after winter.

• count.sub.horz
• region.zenith.count.opaque
• Cloud amount, thin (percent)(percent_thin)
• count_sky
• count.thin
• region_sun_count_opaque
• region_zenith_count_thin
• region_horizon_count_thin
• region.horizon.count.opaque
• region.sun.count
• region.horizon.count.thin
• count_sub_proczen
• region.sun.count.thin
• count_mask
• region_zenith_count
• region_sun_count_thin
• region_sun_count
• sun.strength
• count.box
• region.sun.count.opaque
• count.mask
• Cloud amount, opaque (percent)(percent.opaque)
• region_zenith_count_opaque
• count.sub.proczen
• region_horizon_count_opaque
• count.opaque
• Cloud amount, thin (percent)(percent.thin)
• count_box
• count_opaque
• count.unknown
• count_thin
• region.horizon.count
• region.zenith.count
• Sunshine Meter(sunny)
• region.zenith.count.thin
• Cloud amount, opaque (percent)(percent_opaque)
• sun_strength
• count_sub_horz
• count.sky
• count_unknown
• region_horizon_count