Dataset Format Description

NAVY SST Temporary Observation File

This file contains retrievals or observations in a format which can be readily sorted according to 100km field row and column or 5 degree and 1 degree square.

This file is a sequential data set with fixed-length data records. The data record length is 104 bytes. Since no HIRS data are included in the retrievals, bytes 65 through 104 in each data record are padded with zeroes.

Following normal convention, the first (most significant) bit in the byte sequence for each value is the sign bit (0-positive, 1-negative).

Below are the contents of each data record in this file.

BYTE(S)	VALUE	UNITS	NOTE
1-2	5 degree Square #	Numeric	Range is 1 to 2592.
3-4	1 degree Square #	Numeric	Range is 1 to 25.
5-6	Row # of nearest 100km field point (row 1 is 70S & incr. by 1 each degree northward)	Numeric	Range is 0 to 151 (70S to 80N).
7-8	Column of nearest 100km field point	Numeric	Range is 1 to 360.
9	Type of SST observation/retrieval	Numeric	See local BUFR code table 0-06-193. (Currently see values of 151, 152, 159.)
10	SST observation source	Numeric	See local BUFR code table 0-06-194. (Currently see values of 7, 8, 12.)
11	2-digit year	Numeric	Range is 00 to 99.
12	Month of year	Numeric	Range is 1 to 12.
13-14	Latitude	degrees*100 (N+, S-)	Range is -9000 to 9000.
15-16	Longitude	degrees*100 (E+, W-)	Range is -18000 to 17999.
17	Day of month	Numeric	Range is 1 to 31.
18	Hour (UTC)	Numeric	Range is 0 to 23.
19	Minute	Numeric	Range is 0 to 59.
20	Second	Numeric	Range is 0 to 59.
21-22	SST	deg C*10	Range is -20 to 350. A value of -3000 means the data is missing.
23-24	Standard deviation of SST retrieval	deg C*100	Range is 0 to 32767 although values should usually not be much above 150.
25-26	Solar zenith angle	degrees*10	Range is 0 to 1800.
27-28	Satellite zenith angle	degrees*100	Range is -600 to 600. A value of -3000 means the data is missing.
29-30	Analyzed Field SST	deg C*10	Range is -20 to 350. A value of -3000 means the data is missing.
31-32	Bias in SST retrieval	deg C*100	Range is -150 to 150.
33-34	Solar azimuth angle	degrees*10	Range is 0 to 1800. A value of -3000 means the data is missing.
35-36	Climatological SST	deg C*10	Range is -20 to 350. A value of -3000 means the data is missing.
37	Reliability classification	Numeric	Values are either 1 (clear), 2 (probably clear) or 3(questionable). See this link for more information.
38	Proximity confidence value	Numeric	Values are “6 minus the reliability classification (byte 37) plus 100”. This is either 105 (clear), 104  (probably cear) or 103 (questionable) . See this link for more information.
39-40	Channel 1 albedo	percent*100	Range is 0 to 10000.
41-42	Channel 2 albedo	percent*100	Range is 0 to 10000.
43-44 – daytime for morning satellites (e.g., METOP-2, NOAA-17)	Channel 3a albedo	percent*100	Range is 0 to 10000.
43-44 – daytime and nighttime for afternoon satellites (e.g., NOAA-19, NOAA-18); nighttime for morning satellites (e.g., METOP-2, NOAA-17)	Channel 3b brightness temperature	K*100	Range is 0 to 32767.
45-46	Channel 4 brightness temperature	K*100	Range is 0 to 32767.
47-48	Channel 5 brightness temperature	K*100	Range is 0 to 32767.
49-50	Navy Aerosol Analysis and Prediction System (NAAPS) sulfate optical depth	Numeric*1000	Range is 0 to 32767. (Range observed is 4 to 475)
51-52	Navy Aerosol Analysis and Prediction System (NAAPS) smoke optical depth	Numeric*1000	Range is 0 to 32767. (Range observed is 0 to 203)
53-54	Navy Aerosol Analysis and Prediction System (NAAPS) dust optical depth	Numeric*1000	Range is 0 to 32767. (Range observed is 13 to 188)
55-56	Spare	=0
57-58	Spare	=0
59-60	4-digit year	Numeric	Range is 1998 to present year.
61-62	Navy Aerosol Analysis and Prediction System (NAAPS) total optical depth	Numeric*1000	Range is 0 to 32767. (Range observed is 27 to 623)
63-64	Gridded 1/10^th degree SST	deg C*10	Range is -20 to 350. A value of -800 means the data is over land.
65-104	Spares	=0