Warnings Page for Various Data Products
- OSDPD Product Systems Branch's Level 1B Notices
- (04-10-02 - present) AMSU-A channel 11 detector output
- (11-28-00 - present) Discontinuance of N-15 AVHRR Level 1B
- (7-10-00 - present) N-15 AVHRR and HIRS Level 1B Data Suspect
- (9-28-99 - present) N-15 AMSU-B Antennae Change Impacts LAC and HRPT.
- (3-18-99 - 3-23-99) Improper Solar Zenith Angles in N-14 HRPT Level 1B
- (12-1-98 - present) Changes to Header Record for A-J Series Level 1B
(04-10-02 - present) AMSU-A channel 11 detector output
At 19:32z, JD 100, 10 April 2002,the AMSU-A channel 11 detector output changed rendering the data unusable. All readings of Space, Warm Target and Earth counts are approximately 7195 counts. No other parameters seem to be affected at this time. SOCC and instrument scientists have been notified of our observations. We will continue to monitor and investigate the problem. The user community will be notified of any changes.
(11-28-00 - present) Discontinuance of N-15 AVHRR Level 1B
On November 28th 2000, the Information Processing Division (IPD) will discontinue the distribution of the NOAA-15 Advanced Very High Resolution Radiometer (AVHRR) level 1B data. The current AVHRR data produced is not useable and will no longer be distributed to the general public. The Satellite Operations Control Center (SOCC) and other offices within the National Oceanic and Atmospheric Administration (NOAA) will continue efforts to identify and correct the problem. The user community will be notified when the AVHRR data is reliable and distribution will resume.
(7-10-00 - present) N-15 AVHRR and HIRS Level 1B Data Suspect Click here for details
(9-28-99 - present) N-15 AMSU-B Antennae Change Impacts LAC and HRPT
At 0100GMT on September 28, 1999 the STX-2 and STX-4 antennae on the AMSU-B instrument aboard NOAA-15 became the new operational antennae. This was done to stabilize the biases that have been occuring since the launch of NOAA-15. The current bias values in the 1B header for STX-2 are compatible with this new configuration. This new configuration will reduce the amount of LAC data from NOAA-15; however, by swithching to STX-2 the HRPT data will be less noisy. For an update on this new configuration and its effect on data visit website: NOAA Satellite Status Information or contact Mr. Wayne Winston at (301)457-5681.
(3-18-99 - 3-23-99) Improper Solar Zenith Angles in N-14 HRPT Level 1B
The final year 2000 changes were made to the A-J series level 1B files on March 17, 1999. On March 22, 1999, an error was discovered in the solar zenith angle computation for the AVHRR data (GAC, LAC, and HRPT). All solar zenith angles greater than 127.5 should have been stored as 127.5, but the angles were passed on "as is", scaled, and stored in 2-byte integers thus creating angles that went from values in the range of 127.5 to 0.0 or some small angle. The error was corrected on March 23, 1999. Below is a list of all data that were affected by the error. We hope that this has not created a major problem for any of our users and ask that you accept our apology. Our thanks to the Satellite Operations Control Center and the Computer Operations Branch for their assistance in reprocessing the affected data.
This is a list of the Monterey data sets (denoted with the data set suffix "MO") and a single Wallops Island data set (denoted with the data set suffix "WI") with bad solar zenith angles within the scan lines. This data can not be reprocessed:
| Data Set | Scan Line Numbers |
|---|---|
| NSS.HRPT.NJ.D99078.S0730.E0741.B2172626.WI |
1086 - 3893 |
| NSS.HRPT.NJ.D99077.S1103.E1116.B2171414.MO | 1928 - 4833 |
| NSS.HRPT.NJ.D99077.S1245.E1256.B2171515.MO | 2007 - 4234 |
| NSS.HRPT.NJ.D99078.S1051.E1105.B2172828.MO | 1972 - 4755 |
| NSS.HRPT.NJ.D99078.S1234.E1245.B2172929.MO | 1940 - 4304 |
| NSS.HRPT.NJ.D99081.S1018.E1034.B2177070.MO | 1930 - 4214 |
| NSS.HRPT.NJ.D99081.S1158.E1212.B2177171.MO | 2572 - 4966 |
| NSS.HRPT.NJ.D99082.S1011.E1018.B2178484.MO | 47 & 334 - 2509 |
| NSS.HRPT.NJ.D99082.S1147.E1201.B2178585.MO | 2635 - 5036 |
| NSS.HRPT.NJ.D99080.S1029.E1042.B2175656.MO | 61 & 2046 - 4531 |
| NSS.HRPT.NJ.D99080.S1210.E1223.B2175757.MO | 2307 - 4391 |
(12-1-98 - present) Changes to Header Record for A-J Series Level 1B
NESDIS has implemented Year 2000 enhancements to the level 1B format. Some of the previously spare bytes in the header record are now utilized to reflect four digit years. A summary of the changes follows:
The epoch year of the orbital parameters in the header (bytes 85-86) was switched to a four digit year. This implementation occurred on March 17, 1999 and went into effect beginning with the following data sets:
N-14:
NSS.GHRR.NJ.D99076.S1743.E1913.B2170405.WI NSS.HRPT.NJ.D99076.S1915.E1926.B2170505.WI NSS.LHRR.NJ.D99076.S1859.E1910.B2170404.WI
N-12:
NSS.HRPT.ND.D99076.S2006.E2015.B4071818.GC
Spare bytes 39 and 40 of the header record are now used to provide the four digit year matching the start time of the Level 1B. This change went into effect beginning with the following data sets from December 1, 1998:
N-14:
S1B.HRPT.NJ.D98335.S1729.E1739.B2020808.GC S1B.GHRR.NJ.D98335.S1400.E1554.B2020607.GC S1B.HIRX.NJ.D98335.S1400.E1554.B2020607.GC S1B.MSUX.NJ.D98335.S1400.E1554.B2020607.GC S1B.SSUX.NJ.D 98335.S1400.E1554.B2020607.GC S1B.LHRR.NJ.D98335.S1836.E1847.B2020808.WI
N-12:
S1B.HRPT.ND.D98335.S1913.E1923.B3921010.GC S1B.GHRR.ND.D98335.S1544.E1738.B3920809.GC S1B.HIRX.ND.D98335.S1544.E1738.B3920809.GC S1B.MSUX.ND.D98335.S1544.E1738.B3920809.GC (no SSUX for N-12) S1B.LHRR.ND.D98335.S1632.E1639.B3920808.GC
N-11:
S1B.HIRS.NH.D98335.S1436.E1631.B5252021.GC S1B.MSUS.NH.D98335.S1436.E1631.B5252021.GC S1B.SSUS.NH.D98335.S1436.E1631.B5252021.GC
All year fields in the data records will remain the same (2-digit years with "2000" reported as "00").