Reprocess:SGP BLC reprocessing status

The BLC data was the subject of a reprocessing 
effort last summer in support of the ARSCL
effort.  As a result three distinct windows of
data with varying levels of processing have been
created.

1) 940401-961031 - not reprocessed.  This data
   has a 110m offset in the reported cloud base
   height (see P980831.1).  No sgpblcprofC1.a1
   data available.  Reprocessing required.

2) 961101-990630 - reprocessed.  The 110m offset
   was corrected in this data and the blcprof
   data were created.  This data still contains
   the defunct field 'operational_state' which
   was determined to be useless and was removed
   in later data.  This data will be reprocessed
   at a later date to remove the operational_state
   field to create a continuity with the current
   data.

3) 990701-present - reprocessed/processed without
   'operational_state' field.  Offset has been
   corrected or no longer exists.  The format of
   this data is the target for the previous two
   data windows.

• Cloud, base height, second lowest base detected with threshold algorithm(cloud2)
• Cloud, base height, lowest cloud detected with threshold algorithm(cloud1)
• Cloud, base height, third cloud detected by Klett algorithm(kcloud3)
• Cloud, base height, second lowest base detected by Klett algorithm(kcloud2)
• operational_state
• Cloud, base height, lowest cloud detected by Klett algorithm(kcloud1)
• Cloud, base height, third base detected with thrreshold algorithm(cloud3)

• Raw data stream - documentation not supported

• operational_state
• Cloud, base height, third base detected with thrreshold algorithm(cloud3)
• Cloud, base height, second lowest base detected with threshold algorithm(cloud2)
• Cloud, base height, lowest cloud detected with threshold algorithm(cloud1)
• Cloud, base height, lowest cloud detected by Klett algorithm(kcloud1)
• Cloud, base height, second lowest base detected by Klett algorithm(kcloud2)
• Cloud, base height, third cloud detected by Klett algorithm(kcloud3)

SGP/BLC - Retraction of D000111.4 BLC offset

D000111.4 reported on the reprocessing status of the SGP BLC
data and indicated which time periods had been reprocessed to
remove a 110m offset.

First error:  the offset was actually 122m, not 110m.
Second error: an error in the reprocessing algorithm
              resulted in the offset not being removed.

This DQR retracts D000111.4.  All BLC data processed to date
still have a 122m offset.  That is the cloud base height 
reported in the data stream is 122m too high.

Data processed after 20000204 with version 7.0 of the algorithm 
(recorded in the header of the data file) do not contain the 
offset.

The data processed through 20000204 will be reprocessed
when resources are available.

• Cloud, base height, second lowest base detected with threshold algorithm(cloud2)
• Cloud, base height, lowest cloud detected with threshold algorithm(cloud1)
• Cloud, base height, third cloud detected by Klett algorithm(kcloud3)
• Cloud, base height, second lowest base detected by Klett algorithm(kcloud2)
• Cloud, base height, lowest cloud detected by Klett algorithm(kcloud1)
• Cloud, base height, third base detected with thrreshold algorithm(cloud3)

• Raw data stream - documentation not supported

• Cloud, base height, third base detected with thrreshold algorithm(cloud3)
• Cloud, base height, second lowest base detected with threshold algorithm(cloud2)
• Cloud, base height, lowest cloud detected with threshold algorithm(cloud1)
• Cloud, base height, lowest cloud detected by Klett algorithm(kcloud1)
• Cloud, base height, second lowest base detected by Klett algorithm(kcloud2)
• Cloud, base height, third cloud detected by Klett algorithm(kcloud3)

SGP/BLC/C1 - Metadata errors

The latitude, longitude and altitude of the Belfort Laser Ceilometer
were incorrectly entered into the ARM database.  The correct 
location of the SGP.C1 BLC was:
     Lat: 36.606N
     Lon: 97.485W
     Alt:    316m

• alt
• lon
• lat