MAG/TSI/M1 - 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_thin
• region_zenith_count_opaque
• Cloud amount, opaque (percent)(percent_opaque)
• count_sky
• count_thin
• Cloud amount, thin (percent)(percent_thin)
• region_zenith_count
• count_opaque

MAG/TSI/M1 - Shadowband misalignment

The mirror was not being controlled correctly so the shadowband did not block the sun 
because the encoder failed. Also, the shadowband was not correctly positioned in the 
processed image while at port because the INS system failed.

On 10/19 while at Long Beach port, the encoder was replaced and software was installed to 
get the mirror control board to receive the SeaNav data and correctly position the 
shadowband to mask the sun in the visible image. However, the position of the shadowband in the 
processed image was not correct because the imaging software needed to be configured to 
independently read the SeaNav information.

On 11/8 while at Honolulu port, the TSI software was upgraded at 17:10 and the position of 
the shadowband in the processed image was corrected. However, because SeaNav failed and 
course-over-ground was being used as a surrogate for heading, the heading is 0 deg when 
the ship speed is < 1 m/s. So the platform heading was changed manually at 17:45 to 
correct the position of the shadowband in the visible image while the ship was in port. 

This method was used by the site technicians to configure the TSI upon arrival and 
departure at port until the ship navigation system was replaced on 12/7 at 9:00. The $TSINV 
heading value became accurate while in port so the position of the TSI shadowband was 
automatically controlled correctly both at sea and at port.

• region_zenith_count_thin
• region_sun_count
• region_horizon_count
• region_zenith_count_opaque
• region_horizon_count_opaque
• region_sun_count_opaque
• Cloud amount, opaque (percent)(percent_opaque)
• region_sun_count_thin
• region_horizon_count_thin
• Cloud amount, thin (percent)(percent_thin)
• region_zenith_count

MAG/TSI/M1 - Data processing problem

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

• count_thin
• count_opaque

MAG/TSI/M1 - 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

MAG/ALL/M1 - Ship in Dry Dock

Ship was at dry dock without MAGIC instruments or in transit to or from dry dock.  No 
instrument data available.

• region_zenith_count_thin
• region_sun_count
• East longitude(lon)
• region_zenith_count_opaque
• solar_azimuth
• region_horizon_count_thin
• count_sub_horz
• Sunshine Meter(sunny)
• time
• count_box
• time_offset
• base_time
• region_horizon_count_opaque
• Cloud amount, opaque (percent)(percent_opaque)
• count_thin
• count_unknown
• region_zenith_count
• solar_altitude
• Altitude above mean sea level(alt)
• region_horizon_count
• North latitude(lat)
• region_sun_count_thin
• count_mask
• region_sun_count_opaque
• sun_strength
• count_sky
• Cloud amount, thin (percent)(percent_thin)
• count_sub_proczen
• count_opaque

MAG/TSI/M1 - Ship mast in field-of-view

The mast of Horizon Spirit cargo ship was in the field-of-view of the TSI and contributed 
to the calculated fractional sky cover amount (i.e. the ship's mast was interpreted as a 
cloud). This effect is most apparent during clear sky periods and negligible during 
overcast periods.

An algorithm will be developed to remove the contribution of the ship's mast to the 
fractional sky cover determination.

• region_zenith_count_thin
• region_zenith_count_opaque
• Cloud amount, opaque (percent)(percent_opaque)
• count_thin
• Cloud amount, thin (percent)(percent_thin)
• count_opaque

MAG/AOS/ALL/M1/S1/S2 - Ship in port

The ship was in port during these periods and the measurements may be affected by various 
sources (overhead cranes, anthropogenic sources, etc).

Note: Dates and times were found by looking at the NAV datastream.  The standard deviation 
of pitch, roll, and surge velocity were used to determine when the ship was slowing down 
to enter port or speeding up to leave port.  Thresholds used; pitch (0.01), roll (0.01), 
surge velocity (3.0)

• region_zenith_count_thin
• East longitude(lon)
• region_sun_count
• region_zenith_count_opaque
• solar_azimuth
• region_horizon_count_thin
• count_sub_horz
• Sunshine Meter(sunny)
• time
• count_box
• time_offset
• base_time
• region_horizon_count_opaque
• Cloud amount, opaque (percent)(percent_opaque)
• count_thin
• count_unknown
• region_zenith_count
• solar_altitude
• Altitude above mean sea level(alt)
• region_horizon_count
• North latitude(lat)
• region_sun_count_thin
• count_mask
• region_sun_count_opaque
• sun_strength
• count_sky
• Cloud amount, thin (percent)(percent_thin)
• count_sub_proczen
• count_opaque