The original formats of the Level 1b data before any
enhancements were implemented are contained in this appendix. These
formats are valid for Level 1b data collected after the launch of
TIROS-N and before September 8, 1992. Tables K-1 and K-2 contain
the format of the GAC and LAC/HRPT data records before September 8,
1992, respectively. Table K-3 contains the format of the quality
indicators before September 8, 1994. A detailed explanation of the
contents of the data records is contained in Sections 3.1 and
3.2.
Table K-3. Format of quality indicators before September
8, 1994.
| Byte # |
Bit # |
Contents |
| 9 |
1 |
FATAL FLAG - Data should not be used for product
generation. |
| 2 |
TIME ERROR - A time sequence error was detected
while processing this frame. |
| 3 |
DATA GAP - A gap precedes this frame. |
| 4 |
DATA JITTER - Resync occurred on this frame. |
| 5 |
CALIBRATION - Insufficient data for
calibration. |
| 6 |
NO EARTH LOCATION - Earth location data not
available. |
| 7 |
ASCEND/DESCEND - AVHRR Earth location indication
of ascending (=0) or descending (=1) data. |
| 8 |
P/N STATUS - Pseudo Noise (P/N) occurred (=1) on
the frame, data not used for calibration computations. |
| 10 |
1 |
BIT SYNC STATUS - Drop lock during frame. |
| 2 |
SYNC ERROR - Frame Sync word error greater than
zero. |
| 3 |
FRAME SYNC LOCK - Frame Sync previously dropped
lock. |
| 4 |
FLYWHEELING - Flywheeling detected during this
frame. |
| 5 |
BIT SLIPPAGE - Bit slippage detected during this
frame. |
| 6-8 |
SPARE |
| 11 |
1 |
TIP PARITY - In first minor frame. |
| 2 |
TIP PARITY - In second minor frame. |
| 3 |
TIP PARITY - In third minor frame. |
| 4 |
TIP PARITY - In fourth minor frame. |
| 5 |
TIP PARITY - In fifth minor frame. |
| 6-8 |
SPARE |
| 12 |
1-6 |
SYNC ERRORS - Number of bit errors in frame
sync. |
| 7-8 |
SPARE |