NOAA KLM USER'S GUIDE Section 8.3.1.4.3.2

8.3.1.4.3.2 NOAA-N Format (Version 4, post-April 28, 2005, all spacecraft)

The format for packed GAC Level 1b Data Sets for NOAA-N (Version 4, post-April 28, 2006, all spacecraft) is documented in Table 8.3.1.4.3.2-1. See the legend in Section 8.3.1.1 for further explanation of the headings on this table.

Table 8.3.1.4.3.2-1. Format of GAC data record for NOAA-N (Version 4, post-April 28, 2005, all spacecraft).
Field Name	Start Octet	End Octet	Data Type	Word Size	Number of Words	Scale Factor	Units
SCAN LINE INFORMATION
Scan Line Number (cumulative, starting with 1; range: 0 - 65,535)	1	2	u	2	1	0
Scan Line Year (e.g., 1999)	3	4	u	2	1	0
Scan Line Day of Year (e.g., 365)	5	6	u	2	1	0
Satellite Clock Drift Delta	7	8	i	2	1	0	milliseconds
Scan Line UTC Time of Day	9	12	u	4	1	0	milliseconds
Scan Line Bit Field bit 15: satellite direction (0=northbound; 1=southbound) bit 14: clock drift correction (0=not corrected; 1=scan time corrected bits 13-2: <zero fill> bits 1-0: channel 3 select (0=3B; 1=3A; 2=transition)	13	14	u	2	1	0
<zero fill>	15	24	i	2	5	0
QUALITY INDICATORS
Quality Indicator Bit Field (If a bit is on (=1), the statement is true.) bit 31: do not use scan for product generation bit 30: time sequence error detected within this scan (see below) bit 29: data gap precedes this scan bit 28: insufficient data for calibration (see below) bit 27: earth location data not available (see below) bit 26: first good time following a clock update (nominally 0) bit 25: instrument status changed with this scan bit 24: sync lock dropped during this frame (NOAA) or (MetOp) bit 23: frame sync word has errors (NOAA) or (MetOp) bit 22: frame sync returned to lock (NOAA) or (MetOp) bit 21: frame sync word not valid (NOAA) or (MetOp) bit 20: bit slip occurred during this frame (NOAA) or (MetOp) bits 19-9: bit 8: TIP parity error detected bits 7-6: reflected sunlight detected ch 3B (0=no anomaly; 1=anomaly; 3=unsure) bits 5-4: reflected sunlight detected ch 4 (0=no anomaly; 1=anomaly; 3=unsure) bits 3-2: reflected sunlight detected ch 5 (0=no anomaly; 1=anomaly; 3=unsure) bit 1: resync occurred on this frame (NOAA) or <zero fill>(MetOp) bit 0: pseudonoise occurred on this frame (NOAA) or <zero fill> (MetOp)	25	28	u	4	1	0
Scan Line Quality Flags [<Reserved>] (zero fill)	29	29	u	1	1	0
Scan Line Quality Flags [Time Problem Code] (If a bit is on (=1), the statement is true. All bits off implies the scan time is as expected.) bit 7: time field is bad but can probably be inferred from the previous good time bit 6: time field is bad and can't be inferred from the previous good time bit 5: this record starts a sequence that is inconsistent with previous times (i.e., there is a time discontinuity). This may be associated with a spacecraft clock update. (See bit 26, Quality Indicator Bit Field.) bit 4: start of a sequence that apparently repeats scan times that have been previously accepted bits 3-0: <zero fill>	30	30	u	1	1	0
Scan Line Quality Flags [Calibration Problem Code] (If a bit is on (=1), the statement is true. These bits complement the channel indicators; all bits set to 0 indicates normal calibration.) bit 7: scan line not calibrated: all IR channels failed calibration bit 6: scan line marginally calibrated: one or more IR channels marginally calibrated or one or more, but not all, IR channels failed calibration bit 5: scan line was not calibrated: bad or insufficient PRT data bit 4: scan line marginally calibrated: marginal PRT data bit 3: some uncalibrated channels for this scan line (i.e., one or more, but not all, IR channels failed calibration) bit 2: No visible calibration due to either the presence of MIRP psendonoise in place of AVHRR data (NOAA only)or calibration processing turned off bit 1: <zero fill> bit 0: scan line was not calibrated because of satellite maneuver (MetOp) or <zero fill> NOAA)	31	31	u	1	1	0
Scan Line Quality Flags [Earth Location Problem Code] (If a bit is on (=1), the statement is true. All bits set to 0 implies the earth location was normal.) bit 7: not earth located because of bad time; earth location fields zero-filled bit 6: earth location questionable: questionable time code (see time problem flags above) bit 5: earth location questionable: marginal agreement with reasonableness check bit 4: earth location questionable: fails reasonableness check bits 3-2: bit 1: not earth located because of satellite in-plane maneuver (MetOp) or <zero fill> (NOAA) bit 0: not earth located because of satellite out-of-plane maneuver (MetOp) or <zero fill> (NOAA)	32	32	u	1	1	0
Calibration Quality Flags (all bits off implies a good calibration) Word 1: Channel 3B bits 15-8: <zero fill> bit 7: this channel is not calibrated bit 6: this channel is calibrated but questionable bit 5: all bad blackbody counts for scan line bit 4: all bad space view counts for scan line bit 3: <zero fill> bit 2: marginal blackbody view counts for this line bit 1: marginal space view counts for this line bit 0: <zero fill> Words 2-3: Channels 4-5 (in order)	33	38	u	2	3	0
Count of Bit Errors in Frame Sync	39	40	u	2	1	0
<zero fill>	41	48	i	4	2	0
CALIBRATION COEFFICIENTS
Visible Operational Cal Ch 1 Slope 1	49	52	i	4	1	7
Visible Operational Cal Ch 1 Intercept 1	53	56	i	4	1	6
Visible Operational Cal Ch 1 Slope 2	57	60	i	4	1	7
Visible Operational Cal Ch 1 Intercept 2	61	64	i	4	1	6
Visible Operational Cal Ch 1 Intersection	65	68	i	4	1	0
Visible Test Cal Ch 1 Slope 1	69	72	i	4	1	7
Visible Test Cal Ch 1 Intercept 1	73	76	i	4	1	6
Visible Test Cal Ch 1 Slope 2	77	80	i	4	1	7
Visible Test Cal Ch 1 Intercept 2	81	84	i	4	1	6
Visible Test Cal Ch 1 Intersection	85	88	i	4	1	0
Visible Prelaunch Cal Ch 1 Slope 1	89	92	i	4	1	7
Visible Prelaunch Cal Ch 1 Intercept 1	93	96	i	4	1	6
Visible Prelaunch Cal Ch 1 Slope 2	97	100	i	4	1	7
Visible Prelaunch Cal Ch 1 Intercept 2	101	104	i	4	1	6
Visible Prelaunch Cal Ch 1 Intersection	105	108	i	4	1	0
Visible Operational Cal Ch 2 Slope 1	109	112	i	4	1	7
Visible Operational Cal Ch 2 Intercept 1	113	116	i	4	1	6
Visible Operational Cal Ch 2 Slope 2	117	120	i	4	1	7
Visible Operational Cal Ch 2 Intercept 2	121	124	i	4	1	6
Visible Operational Cal Ch 2 Intersection	125	128	i	4	1	0
Visible Test Cal Ch 2 Slope 1	129	132	i	4	1	7
Visible Test Cal Ch 2 Intercept 1	133	136	i	4	1	6
Visible Test Cal Ch 2 Slope 2	137	140	i	4	1	7
Visible Test Cal Ch 2 Intercept 2	141	144	i	4	1	6
Visible Test Cal Ch 2 Intersection	145	148	i	4	1	0
Visible Prelaunch Cal Ch 2 Slope 1	149	152	i	4	1	7
Visible Prelaunch Cal Ch 2 Intercept 1	153	156	i	4	1	6
Visible Prelaunch Cal Ch 2 Slope 2	157	160	i	4	1	7
Visible Prelaunch Cal Ch 2 Intercept 2	161	164	i	4	1	6
Visible Prelaunch Cal Ch 2 Intersection	165	168	i	4	1	0
Visible Operational Cal Ch 3A Slope 1	169	172	i	4	1	7
Visible Operational Cal Ch 3A Intercept 1	173	176	i	4	1	6
Visible Operational Cal Ch 3A Slope 2	177	180	i	4	1	7
Visible Operational Cal Ch 3A Intercept 2	181	184	i	4	1	6
Visible Operational Cal Ch 3A Intersection	185	188	i	4	1	0
Visible Test Cal Ch 3A Slope 1	189	192	i	4	1	7
Visible Test Cal Ch 3A Intercept 1	193	196	i	4	1	6
Visible Test Cal Ch 3A Slope 2	197	200	i	4	1	7
Visible Test Cal Ch 3A Intercept 2	201	204	i	4	1	6
Visible Test Cal Ch 3A Intersection	205	208	i	4	1	0
Visible Prelaunch Cal Ch 3A Slope 1	209	212	i	4	1	7
Visible Prelaunch Cal Ch 3A Intercept 1	213	216	i	4	1	6
Visible Prelaunch Cal Ch 3A Slope 2	217	220	i	4	1	7
Visible Prelaunch Cal Ch 3A Intercept 2	221	224	i	4	1	6
Visible Prelaunch Cal Ch 3A Intersection	225	228	i	4	1	0
IR Operational Cal Ch 3B Coefficient 1	229	232	i	4	1	6
IR Operational Cal Ch 3B Coefficient 2	233	236	i	4	1	6
IR Operational Cal Ch 3B Coefficient 3	237	240	i	4	1	6
IR Test Cal Ch 3B Coefficient 1	241	244	i	4	1	6
IR Test Cal Ch 3B Coefficient 2	245	248	i	4	1	6
IR Test Cal Ch 3B Coefficient 3	249	252	i	4	1	6
IR Operational Cal Ch 4 Coefficient 1	253	256	i	4	1	6
IR Operational Cal Ch 4 Coefficient 2	257	260	i	4	1	6
IR Operational Cal Ch 4 Coefficient 3	261	264	i	4	1	7
IR Test Cal Ch 4 Coefficient 1	265	268	i	4	1	6
IR Test Cal Ch 4 Coefficient 2	269	272	i	4	1	6
IR Test Cal Ch 4 Coefficient 3	273	276	i	4	1	7
IR Operational Cal Ch 5 Coefficient 1	277	280	i	4	1	6
IR Operational Cal Ch 5 Coefficient 2	281	284	i	4	1	6
IR Operational Cal Ch 5 Coefficient 3	285	288	i	4	1	7
IR Test Cal Ch 5 Coefficient 1	289	292	i	4	1	6
IR Test Cal Ch 5 Coefficient 2	293	296	i	4	1	6
IR Test Cal Ch 5 Coefficient 3	297	300	i	4	1	7
NAVIGATION
Computed Yaw Steering (MetOp: content defined below) or (NOAA) Word 1: Computed roll angle Word 2: Computed pitch angle Word 3: Computed yaw angle	301	306	i	2	3	0	degrees
Total Applied Attitude Correction Word 1: Roll Word 2: Pitch Word 3: Yaw	307	312	i	2	3	0	degrees
Navigation Status Bit Field(content defined below, depends on origin of data, either NOAA or MetOp) For NOAA Data: bits 31-18: <zero fill> bit 17: earth location at the satellite subpoint is accurate and reasonable, i.e., is within tolerance defined by "Nadir Earth Location tolerance" in header: 0=out of tolerance; 1 = in tolerance bit 16: Euler error angles from the CPU telemetry used by AELDS to correct the earth locations: 0=FALSE; 1=TRUE bits 15 - 12: earth location indicator: 0 = earth location available; 1 = first scan whose time is more thatn 24 hours older than the time [epoch] of the user ephemeris file; 2 = no earth location available bits 11 - 8: spacecraft attitude control 0 = operating in YGC or NOMINAL mode and attitude is good; 1 = operating in another mode but attitude is good; 2 = operating in YGC or NOMINAL mode but tests are being conducted which may cause attitude to exceed nominal tolerance; 3 = operating in another mode while tests are being conducted which may cause attitude to exceed nominal tolerance. bits 7 - 4: attitude SMODE 0 = NOMINAL mode; 1 = rate nulling mode; 2 = YGC mode; 3 = search mode; 4 = coast mode bits 3 - 0: attitude PWTIP$AC 0 = NOMINAL mode/no test; 1 = yaw axis test in progress; 2 = roll axis test in progress; 3 = pitch axis test in progress For MetOp Data: bits 31-21: <zero fill> bit 20-19: yaw steering parameters usage indicator: 0 = no yaw steering correction; 1 = measured angles from the MetOp SVM telemetry; 2 = computed angles from AELDS; 3 = measured angles + computed angles. bit 18: MetOp maneuver indicator 0 = scan does not occur during a MetOp in-plane or out-of-plane maneuver; 1 = scan, or some part of it, occurs during a maneuver. bit 17: bit 16: bits 15-12: bits 11-8: bits 7-4: OPM PF sub-mode 0 = fine point mode (FPM); 1 = yaw steering mode (YSM) bits 3-0: SVM PF mode 0 = LHM 5 = FAM3 OCM0 1 = RRM 6 = OPM 2 = CAM 7 = OCM1 3 = FAM1 8 = OCM2 4 = FAM2 9 = OCMT	313	316	u	4	1	0
Time Associated with Euler Angles	317	320	i	4	1	0	seconds
Euler Angles (NOAA, from TIP CPU telemetry near end of scan; MetOp [in FPM], from SVM telemetry just before start of scan) or Yaw Steering Parameters (MetOp [in YSM], from SVM telemetry or AELDS near nadir of scan) Word 1: Roll Word 2: Pitch Word 3: Yaw	321	326	i	2	3	3	degrees
Spacecraft Altitude above Reference Ellipsoid	327	328	u	2	1	1	kilometers
Angular Relationships (relative azimuth range +/- 180.00 degrees) Word 1: Solar zenith angle, FOV 5 Word 2: Satellite zenith angle, FOV 5 Word 3: Relative azimuth angle, FOV 5 Word 4: Solar zenith angle, FOV 13 ... (set of 3 angles every 8 FOVs) ... Word 153: Relative azimuth angle, FOV 405	329	634	i	2	153	2	degrees
<zero fill>	635	640	i	2	3	0
Earth Location (north latitude and east longitude are positive) Word 1: Latitude, FOV 5 Word 2: Longitude, FOV 5 Word 3: Latitude, FOV 13 ... (lat/lon word pair every 8 FOVs) ... Word 102: Longitude, FOV 405	641	1048	i	4	102	4	degrees
<zero fill>	1049	1056	i	4	2	0
FRAME TELEMETRY
Frame Sync (The first 60 bits (in 6 10-bit values) from a 63-bit pseudonoise generator starting in the all 1's state. The generator polynomial is: x⁶ + x⁵ + x² + 1.) Word 1: 644 Word 2: 367 Word 3: 860 Word 4: 413 Word 5: 527 Word 6: 149	1057	1068	u	2	6	0
ID Word 1 bits 15-10: <zero fill> bit 9: MIRP/AVHRR sync (0=internal sync; 1=AVHRR sync) bits 8-7: frame ID (0=GAC frame; 1=HRPT minor frame 1; 2=HRPT minor frame 2; 3=HRPT minor frame 3) bits 6-3: spacecraft address bit 2: resync (0=frame stable; 1=frame resync occurred) bit 1: AVHRR input (0=pseudonoise; 1=normal) bit 0: channel 3 status (0=AVHRR channel 3B; 1=AVHRR channel 3A) Word 2 bits 15-10: <zero fill> bits 9-0: <undefined>	1069	1072	u	2	2	0
Time Code Word 1 bits 15-10: <zero fill> bits 9-1: binary day count bit 0: 0 (zero) Word 2 bits 15-10: <zero fill> bit 9: 1 (one) bit 8: 0 (zero) bit 7: 1 (one) bits 6-0: most significant part of binary millisecond of day count Word 3 bits 15-10: <zero fill> bits 9-0: part of binary millisecond of day count Word 4 bits 15-10: <zero fill> bits 9-0: least significant part of binary millisecond of day count	1073	1080	u	2	4	0
Ramp Calibration Word 1: Ramp calibration, channel 1 Word 2: Ramp calibration, channel 2 Word 3: Ramp calibration, channel 3 Word 4: Ramp calibration, channel 4 Word 5: Ramp calibration, channel 5	1081	1090	u	2	5	0	counts
Internal Target Temperature (Three readings from one of the four platinum resistance thermometers (PRT). A different PRT is sampled for each scan. Every fifth scan will contain a reference value of 0 in place of each reading.) Word 1: PRT reading 1 Word 2: PRT reading 2 Word 3: PRT reading 3	1091	1096	u	2	3	0	counts
Patch Temperature	1097	1098	u	2	1	0	counts
<Undefined>	1099	1100	u	2	1	0
Back Scan (Ten samples of calibration target view data from each of AVHRR channels 3, 4, and 5.) Word 1: channel 3, sample 1 Word 2: channel 4, sample 1 Word 3: channel 5, sample 1 Word 4: channel 3, sample 2 ... Word 30: channel 5, sample 10	1101	1160	u	2	30	0	counts
Space Data (Ten samples of space view data from each of AVHRR channels 1, 2, 3, 4, and 5.) Word 1: channel 1, sample 1 Word 2: channel 2, sample 1 ... Word 5: channel 5, sample 1 Word 6: channel 1, sample 2 ... Word 50: channel 5, sample 10	1161	1260	u	2	50	0	counts
Sync Delta bits 15-10: <zero fill> bit 9: AVHRR sync (0=early; 1=late) bits 8-0: 9-bit binary count of 0.9984 MHz periods	1261	1262	u	2	1	0
<zero fill>	1263	1264	i	2	1	0
EARTH OBSERVATIONS
Earth Data Word 1 bits 31-30: <zero fill> bits 29-20: channel 1, FOV 1 bits 19-10: channel 2, FOV 1 bits 9-0: channel 3, FOV 1 Word 2 bits 31-30: <zero fill> bits 29-20: channel 4, FOV 1 bits 19-10: channel 5, FOV 1 bits 9-0: channel 1, FOV 2 ... Word 682 bits 31-30: <zero fill> bits 29-20: channel 4, FOV 409 bits 19-10: channel 5, FOV 409 bits 9-0: <zero fill>	1265	3992	u	4	682	0	counts
<zero fill>	3993	4000	i	4	2	0
DIGITAL B HOUSEKEEPING TELEMETRY
Digital B Telemetry Update Flags (If bit = 0, associated telemetry item is up-to-date. If bit = 1, associated telemetry item was not updated during most recent telemetry cycle - possibly due to lost frame.) bit 15: scan motor/telemetry status bit 14: electronics/telemetry status bit 13: channel 1 status bit 12: channel 2 status bit 11: channel 3A status bit 10: channel 3B status bit 9: channel 4 status bit 8: channel 5 status bit 7: channel 3A/3B select status bit 6: voltage calibration status bit 5: cooler heat status bit 4: scan motor mode status bit 3: telemetry lock status bit 2: earth shield status bit 1: patch control status bit 0: <zero fill>	4001	4002	u	2	1	0
AVHRR Digital B Data bit 15: scan motor/telemetry status (0=off; 1=on) bit 14: electronics/telemetry status (0=off; 1=on) bit 13: channel 1 status (0=disable; 1=enable) bit 12: channel 2 status (0=disable; 1=enable) bit 11: channel 3A status (0=disable; 1=enable) bit 10: channel 3B status (0=disable; 1=enable) bit 9: channel 4 status (0=disable; 1=enable) bit 8: channel 5 status (0=disable; 1=enable) bit 7: channel 3A/3B select status (0=3B; 1=3A) bit 6: voltage calibration status (0=off; 1=on) bit 5: cooler heat status (0=off; 1=on) bit 4: scan motor mode status (0=low; 1=high) bit 3: telemetry lock status (0=not locked on; 1=locked on) bit 2: earth shield status (0=disable; 1=deploy) bit 1: patch control status (0=off; 1=on) bit 0: <zero fill>	4003	4004	u	2	1	0
<zero fill>	4005	4016	i	4	3	0
ANALOG HOUSEKEEPING TELEMETRY
Analog Telemetry Update Flags (If bit = 0, associated telemetry item is up-to-date. If bit = 1, associated telemetry item was not updated during most recent telemetry cycle - possibly due to lost frame.) bits 31-23: <zero fill> bit 22: motor current bit 21: electronics current bit 20: blackbody temperature, channel 5 bit 19: detector #5 bias voltage bit 18: blackbody temperature, channel 4 bit 17: blackbody temperature, channel 3B bit 16: A/D converter temperature bit 15: blackbody temperature 4 bit 14: blackbody temperature 3 bit 13: blackbody temperature 2 bit 12: blackbody temperature 1 bit 11: motor housing temperature bit 10: baseplate temperature bit 9: electronics temperature bit 8: cooler housing temperature bit 7: radiator temperature bit 6: patch temperature bit 5: earth shield position bit 4: patch temperature extended bit 3: detector #4 bias voltage bit 2: reference voltage bit 1: patch power bit 0: <zero fill>	4017	4020	u	4	1	0
Patch Temperature (range: 0 - 255)	4021	4021	u	1	1	0	counts
Patch Temperature Extended (range: 0 - 255)	4022	4022	u	1	1	0	counts
Patch Power (range: 0 - 255)	4023	4023	u	1	1	0	counts
Radiator Temperature (range: 0 - 255)	4024	4024	u	1	1	0	counts
Black Body Temperature 1 (range: 0 - 255)	4025	4025	u	1	1	0	counts
Black Body Temperature 2 (range: 0 - 255)	4026	4026	u	1	1	0	counts
Black Body Temperature 3 (range: 0 - 255)	4027	4027	u	1	1	0	counts
Black Body Temperature 4 (range: 0 - 255)	4028	4028	u	1	1	0	counts
Electronics Current (range: 0 - 255)	4029	4029	u	1	1	0	counts
Motor Current (range: 0 - 255)	4030	4030	u	1	1	0	counts
Earth Shield Position (range: 0 - 255)	4031	4031	u	1	1	0	counts
Electronics Temperature (range: 0 - 255)	4032	4032	u	1	1	0	counts
Cooler Housing Temperature (range: 0 - 255)	4033	4033	u	1	1	0	counts
Baseplate Temperature (range: 0 - 255)	4034	4034	u	1	1	0	counts
Motor Housing Temperature (range: 0 - 255)	4035	4035	u	1	1	0	counts
A/D Converter Temperature (range: 0 - 255)	4036	4036	u	1	1	0	counts
Detector #4 Bias Voltage (range: 0 - 255)	4037	4037	u	1	1	0	counts
Detector #5 Bias Voltage (range: 0 - 255)	4038	4038	u	1	1	0	counts
Blackbody Temperature, Channel 3B (range: 0 - 255)	4039	4039	u	1	1	0	counts
Blackbody Temperature, Channel 4 (range: 0 - 255)	4040	4040	u	1	1	0	counts
Blackbody Temperature, Channel 5 (range: 0 - 255)	4041	4041	u	1	1	0	counts
Reference Voltage (range: 0 - 255)	4042	4042	u	1	1	0	counts
<zero fill>	4043	4048	i	2	3	0
CLOUDS FROM AVHRR (CLAVR)
<Reserved> [CLAVR Status Bit Field] bits 31-1: <undefined> bit 0: CLAVR status (0=disable, CCM codes zero-filled; 1=enable)	4049	4052	u	4	1	0
<Reserved> [CLAVR]	4053	4056	u	4	1	0
<Reserved> [CLAVR CCM (Clear/Cloudy/Mixed) Codes (0=clear;1=mixed clear; 2=mixed cloudy; 3=cloudy)] Word 1 bits 15-14: CCM code, FOV 1 bits 13-12: CCM code, FOV 2 ... bits 1-0: CCM code, FOV 8 Word 2 bits 15-14: CCM code, FOV 9 ... bits 1-0: CCM code, FOV 16 ... (set of 8 CCM codes per word) ... Word 52 bits 15-14: CCM code, FOV 409 bits 13-0: <zero fill>	4057	4160	u	2	52	0
FILLER
<zero fill>	4161	4608	i	4	112	0

Table 8.3.1.4.3.2-1. Format of GAC data record for NOAA-N (Version 4, post-April 28, 2005, all spacecraft).

Field Name

Start Octet

End Octet

Data Type

Word Size

Number of Words

Scale Factor

Units

Notes

SCAN LINE INFORMATION

Scan Line Number (cumulative, starting with 1; range: 0 - 65,535)

Scan Line Year (e.g., 1999)

Scan Line Day of Year (e.g., 365)

Satellite Clock Drift Delta

milliseconds

Scan Line UTC Time of Day

milliseconds

Scan Line Bit Field

bit 15: satellite direction (0=northbound; 1=southbound)
bit 14: clock drift correction (0=not corrected; 1=scan time corrected bits 13-2: <zero fill>
bits 1-0: channel 3 select (0=3B; 1=3A; 2=transition)

QUALITY INDICATORS

Quality Indicator Bit Field (If a bit is on (=1), the statement is true.)

bit 31: do not use scan for product generation
bit 30: time sequence error detected within this scan (see below)
bit 29: data gap precedes this scan
bit 28: insufficient data for calibration (see below)
bit 27: earth location data not available (see below)
bit 26: first good time following a clock update (nominally 0)
bit 25: instrument status changed with this scan
bit 24: sync lock dropped during this frame (NOAA) or (MetOp)
bit 23: frame sync word has errors (NOAA) or (MetOp)
bit 22: frame sync returned to lock (NOAA) or (MetOp)
bit 21: frame sync word not valid (NOAA) or (MetOp)
bit 20: bit slip occurred during this frame (NOAA) or (MetOp)
bits 19-9:
bit 8: TIP parity error detected
bits 7-6: reflected sunlight detected ch 3B (0=no anomaly; 1=anomaly; 3=unsure)
bits 5-4: reflected sunlight detected ch 4 (0=no anomaly; 1=anomaly; 3=unsure)
bits 3-2: reflected sunlight detected ch 5 (0=no anomaly; 1=anomaly; 3=unsure)
bit 1: resync occurred on this frame (NOAA) or <zero fill>(MetOp)
bit 0: pseudonoise occurred on this frame (NOAA) or <zero fill> (MetOp)

Scan Line Quality Flags [<Reserved>] (zero fill)

Scan Line Quality Flags [Time Problem Code] (If a bit is on (=1), the statement is true. All bits off implies the scan time is as expected.)

bit 7: time field is bad but can probably be inferred from the previous good time
bit 6: time field is bad and can't be inferred from the previous good time
bit 5: this record starts a sequence that is inconsistent with previous times (i.e., there is a time discontinuity). This may be associated with a spacecraft clock update. (See bit 26, Quality Indicator Bit Field.)
bit 4: start of a sequence that apparently repeats scan times that have been previously accepted
bits 3-0: <zero fill>

Scan Line Quality Flags [Calibration Problem Code] (If a bit is on (=1), the statement is true. These bits complement the channel indicators; all bits set to 0 indicates normal calibration.)

bit 7: scan line not calibrated: all IR channels failed calibration
bit 6: scan line marginally calibrated: one or more IR channels marginally calibrated or one or more, but not all, IR channels failed calibration
bit 5: scan line was not calibrated: bad or insufficient PRT data
bit 4: scan line marginally calibrated: marginal PRT data
bit 3: some uncalibrated channels for this scan line (i.e., one or more, but not all, IR channels failed calibration)
bit 2: No visible calibration due to either the presence of MIRP psendonoise in place of AVHRR data (NOAA only)or calibration processing turned off
bit 1: <zero fill>
bit 0: scan line was not calibrated because of satellite maneuver (MetOp) or <zero fill> NOAA)

Scan Line Quality Flags [Earth Location Problem Code] (If a bit is on (=1), the statement is true. All bits set to 0 implies the earth location was normal.)

bit 7: not earth located because of bad time; earth location fields zero-filled
bit 6: earth location questionable: questionable time code (see time problem flags above)
bit 5: earth location questionable: marginal agreement with reasonableness check
bit 4: earth location questionable: fails reasonableness check
bits 3-2:
bit 1: not earth located because of satellite in-plane maneuver (MetOp) or <zero fill> (NOAA)
bit 0: not earth located because of satellite out-of-plane maneuver (MetOp) or <zero fill> (NOAA)

Calibration Quality Flags (all bits off implies a good calibration)

Word 1: Channel 3B
bits 15-8: <zero fill>
bit 7: this channel is not calibrated
bit 6: this channel is calibrated but questionable
bit 5: all bad blackbody counts for scan line
bit 4: all bad space view counts for scan line
bit 3: <zero fill>
bit 2: marginal blackbody view counts for this line
bit 1: marginal space view counts for this line
bit 0: <zero fill>

Words 2-3: Channels 4-5 (in order)

Count of Bit Errors in Frame Sync

CALIBRATION COEFFICIENTS

Visible Operational Cal Ch 1 Slope 1

Visible Operational Cal Ch 1 Intercept 1

Visible Operational Cal Ch 1 Slope 2

Visible Operational Cal Ch 1 Intercept 2

Visible Operational Cal Ch 1 Intersection

Visible Test Cal Ch 1 Slope 1

Visible Test Cal Ch 1 Intercept 1

Visible Test Cal Ch 1 Slope 2

Visible Test Cal Ch 1 Intercept 2

Visible Test Cal Ch 1 Intersection

Visible Prelaunch Cal Ch 1 Slope 1

Visible Prelaunch Cal Ch 1 Intercept 1

Visible Prelaunch Cal Ch 1 Slope 2

100

Visible Prelaunch Cal Ch 1 Intercept 2

101

104

Visible Prelaunch Cal Ch 1 Intersection

105

108

Visible Operational Cal Ch 2 Slope 1

109

112

Visible Operational Cal Ch 2 Intercept 1

113

116

Visible Operational Cal Ch 2 Slope 2

117

120

Visible Operational Cal Ch 2 Intercept 2

121

124

Visible Operational Cal Ch 2 Intersection

125

128

Visible Test Cal Ch 2 Slope 1

129

132

Visible Test Cal Ch 2 Intercept 1

133

136

Visible Test Cal Ch 2 Slope 2

137

140

Visible Test Cal Ch 2 Intercept 2

141

144

Visible Test Cal Ch 2 Intersection

145

148

Visible Prelaunch Cal Ch 2 Slope 1

149

152

Visible Prelaunch Cal Ch 2 Intercept 1

153

156

Visible Prelaunch Cal Ch 2 Slope 2

157

160

Visible Prelaunch Cal Ch 2 Intercept 2

161

164

Visible Prelaunch Cal Ch 2 Intersection

165

168

Visible Operational Cal Ch 3A Slope 1

169

172

Visible Operational Cal Ch 3A Intercept 1

173

176

Visible Operational Cal Ch 3A Slope 2

177

180

Visible Operational Cal Ch 3A Intercept 2

181

184

Visible Operational Cal Ch 3A Intersection

185

188

Visible Test Cal Ch 3A Slope 1

189

192

Visible Test Cal Ch 3A Intercept 1

193

196

Visible Test Cal Ch 3A Slope 2

197

200

Visible Test Cal Ch 3A Intercept 2

201

204

Visible Test Cal Ch 3A Intersection

205

208

Visible Prelaunch Cal Ch 3A Slope 1

209

212

Visible Prelaunch Cal Ch 3A Intercept 1

213

216

Visible Prelaunch Cal Ch 3A Slope 2

217

220

Visible Prelaunch Cal Ch 3A Intercept 2

221

224

Visible Prelaunch Cal Ch 3A Intersection

225

228

IR Operational Cal Ch 3B Coefficient 1

229

232

IR Operational Cal Ch 3B Coefficient 2

233

236

IR Operational Cal Ch 3B Coefficient 3

237

240

IR Test Cal Ch 3B Coefficient 1

241

244

IR Test Cal Ch 3B Coefficient 2

245

248

IR Test Cal Ch 3B Coefficient 3

249

252

IR Operational Cal Ch 4 Coefficient 1

253

256

IR Operational Cal Ch 4 Coefficient 2

257

260

IR Operational Cal Ch 4 Coefficient 3

261

264

IR Test Cal Ch 4 Coefficient 1

265

268

IR Test Cal Ch 4 Coefficient 2

269

272

IR Test Cal Ch 4 Coefficient 3

273

276

IR Operational Cal Ch 5 Coefficient 1

277

280

IR Operational Cal Ch 5 Coefficient 2

281

284

IR Operational Cal Ch 5 Coefficient 3

285

288

IR Test Cal Ch 5 Coefficient 1

289

292

IR Test Cal Ch 5 Coefficient 2

293

296

IR Test Cal Ch 5 Coefficient 3

297

300

NAVIGATION

Computed Yaw Steering (MetOp: content defined below) or (NOAA)
Word 1: Computed roll angle
Word 2: Computed pitch angle
Word 3: Computed yaw angle

301

306

degrees

Total Applied Attitude Correction
Word 1: Roll
Word 2: Pitch
Word 3: Yaw

307

312

degrees

Navigation Status Bit Field(content defined below, depends on origin of data, either NOAA or MetOp)
For NOAA Data:

bits 31-18: <zero fill>
bit 17: earth location at the satellite subpoint is accurate and reasonable, i.e., is within tolerance defined by "Nadir Earth Location tolerance" in header:
0=out of tolerance;
1 = in tolerance

bit 16: Euler error angles from the CPU telemetry used by AELDS to correct the earth locations:
0=FALSE;
1=TRUE

bits 15 - 12: earth location indicator:
0 = earth location available;
1 = first scan whose time is more thatn 24 hours older than the time [epoch] of the user ephemeris file;
2 = no earth location available

bits 11 - 8: spacecraft attitude control
0 = operating in YGC or NOMINAL mode and attitude is good;
1 = operating in another mode but attitude is good;
2 = operating in YGC or NOMINAL mode but tests are being conducted which may cause attitude to exceed nominal tolerance;
3 = operating in another mode while tests are being conducted which may cause attitude to exceed nominal tolerance.

bits 7 - 4: attitude SMODE
0 = NOMINAL mode;
1 = rate nulling mode;
2 = YGC mode;
3 = search mode;
4 = coast mode

bits 3 - 0: attitude PWTIP$AC
0 = NOMINAL mode/no test;
1 = yaw axis test in progress;
2 = roll axis test in progress;
3 = pitch axis test in progress

For MetOp Data:
bits 31-21: <zero fill>

bit 20-19: yaw steering parameters usage indicator:
0 = no yaw steering correction;
1 = measured angles from the MetOp SVM telemetry;
2 = computed angles from AELDS;
3 = measured angles + computed angles.

bit 18: MetOp maneuver indicator
0 = scan does not occur during a MetOp in-plane or out-of-plane maneuver;
1 = scan, or some part of it, occurs during a maneuver.

bit 17:
bit 16:
bits 15-12:
bits 11-8:
bits 7-4: OPM PF sub-mode 0 = fine point mode (FPM);
1 = yaw steering mode (YSM)

bits 3-0: SVM PF mode
0 = LHM      5 = FAM3     OCM0
1 = RRM      6 = OPM
2 = CAM      7 = OCM1
3 = FAM1     8 = OCM2
4 = FAM2     9 = OCMT

313

316

Time Associated with Euler Angles

317

320

seconds

Euler Angles (NOAA, from TIP CPU telemetry near end of scan;
MetOp [in FPM], from SVM telemetry just before start of scan) or
Yaw Steering Parameters (MetOp [in YSM], from SVM telemetry or AELDS near nadir of scan)
Word 1: Roll
Word 2: Pitch
Word 3: Yaw

321

326

degrees

Spacecraft Altitude above Reference Ellipsoid

327

328

kilometers

Angular Relationships (relative azimuth range +/- 180.00 degrees)
Word 1: Solar zenith angle, FOV 5
Word 2: Satellite zenith angle, FOV 5
Word 3: Relative azimuth angle, FOV 5
Word 4: Solar zenith angle, FOV 13
...
(set of 3 angles every 8 FOVs)
...
Word 153: Relative azimuth angle, FOV 405

329

634

153

degrees

635

640

Earth Location (north latitude and east longitude are positive)
Word 1: Latitude, FOV 5
Word 2: Longitude, FOV 5
Word 3: Latitude, FOV 13
...
(lat/lon word pair every 8 FOVs)
...
Word 102: Longitude, FOV 405

641

1048

102

degrees

1049

1056

FRAME TELEMETRY

Frame Sync (The first 60 bits (in 6 10-bit values) from a 63-bit pseudonoise generator starting in the all 1's state. The generator polynomial is: x⁶ + x⁵ + x² + 1.)
Word 1: 644
Word 2: 367
Word 3: 860
Word 4: 413
Word 5: 527
Word 6: 149

1057

1068

ID
Word 1
bits 15-10: <zero fill>
bit 9: MIRP/AVHRR sync (0=internal sync; 1=AVHRR sync)
bits 8-7: frame ID (0=GAC frame; 1=HRPT minor frame 1; 2=HRPT minor frame 2; 3=HRPT minor frame 3)
bits 6-3: spacecraft address
bit 2: resync (0=frame stable; 1=frame resync occurred)
bit 1: AVHRR input (0=pseudonoise; 1=normal)
bit 0: channel 3 status (0=AVHRR channel 3B; 1=AVHRR channel 3A)
Word 2
bits 15-10: <zero fill>
bits 9-0: <undefined>

1069

1072

Time Code
Word 1
bits 15-10: <zero fill>
bits 9-1: binary day count
bit 0: 0 (zero)

Word 2
bits 15-10: <zero fill>
bit 9: 1 (one)
bit 8: 0 (zero)
bit 7: 1 (one)
bits 6-0: most significant part of binary millisecond of day count

Word 3
bits 15-10: <zero fill>
bits 9-0: part of binary millisecond of day count

Word 4
bits 15-10: <zero fill>
bits 9-0: least significant part of binary millisecond of day count

1073

1080

Ramp Calibration
Word 1: Ramp calibration, channel 1
Word 2: Ramp calibration, channel 2
Word 3: Ramp calibration, channel 3
Word 4: Ramp calibration, channel 4
Word 5: Ramp calibration, channel 5

1081

1090

counts

Internal Target Temperature (Three readings from one of the four platinum resistance thermometers (PRT). A different PRT is sampled for each scan. Every fifth scan will contain a reference value of 0 in place of each reading.)
Word 1: PRT reading 1
Word 2: PRT reading 2
Word 3: PRT reading 3

1091

1096

counts

Patch Temperature

1097

1098

counts

1099

1100

Back Scan (Ten samples of calibration target view data from each of AVHRR channels 3, 4, and 5.)
Word 1: channel 3, sample 1
Word 2: channel 4, sample 1
Word 3: channel 5, sample 1
Word 4: channel 3, sample 2
...
Word 30: channel 5, sample 10

1101

1160

counts

Space Data (Ten samples of space view data from each of AVHRR channels 1, 2, 3, 4, and 5.)
Word 1: channel 1, sample 1
Word 2: channel 2, sample 1
...
Word 5: channel 5, sample 1
Word 6: channel 1, sample 2
...
Word 50: channel 5, sample 10

1161

1260

counts

Sync Delta
bits 15-10: <zero fill>
bit 9: AVHRR sync (0=early; 1=late)
bits 8-0: 9-bit binary count of 0.9984 MHz periods

1261

1262

1263

1264

EARTH OBSERVATIONS

Earth Data
Word 1
bits 31-30: <zero fill> bits 29-20: channel 1, FOV 1
bits 19-10: channel 2, FOV 1
bits 9-0: channel 3, FOV 1

Word 2
bits 31-30: <zero fill>
bits 29-20: channel 4, FOV 1
bits 19-10: channel 5, FOV 1
bits 9-0: channel 1, FOV 2
...
Word 682
bits 31-30: <zero fill>
bits 29-20: channel 4, FOV 409
bits 19-10: channel 5, FOV 409
bits 9-0: <zero fill>

1265

3992

682

counts

3993

4000

DIGITAL B HOUSEKEEPING TELEMETRY

Digital B Telemetry Update Flags (If bit = 0, associated telemetry item is up-to-date. If bit = 1, associated telemetry item was not updated during most recent telemetry cycle - possibly due to lost frame.)
bit 15: scan motor/telemetry status
bit 14: electronics/telemetry status
bit 13: channel 1 status
bit 12: channel 2 status
bit 11: channel 3A status
bit 10: channel 3B status
bit 9: channel 4 status
bit 8: channel 5 status
bit 7: channel 3A/3B select status
bit 6: voltage calibration status
bit 5: cooler heat status
bit 4: scan motor mode status
bit 3: telemetry lock status
bit 2: earth shield status
bit 1: patch control status
bit 0: <zero fill>

4001

4002

AVHRR Digital B Data
bit 15: scan motor/telemetry status (0=off; 1=on)
bit 14: electronics/telemetry status (0=off; 1=on)
bit 13: channel 1 status (0=disable; 1=enable)
bit 12: channel 2 status (0=disable; 1=enable)
bit 11: channel 3A status (0=disable; 1=enable)
bit 10: channel 3B status (0=disable; 1=enable)
bit 9: channel 4 status (0=disable; 1=enable)
bit 8: channel 5 status (0=disable; 1=enable)
bit 7: channel 3A/3B select status (0=3B; 1=3A)
bit 6: voltage calibration status (0=off; 1=on)
bit 5: cooler heat status (0=off; 1=on)
bit 4: scan motor mode status (0=low; 1=high)
bit 3: telemetry lock status (0=not locked on; 1=locked on)
bit 2: earth shield status (0=disable; 1=deploy)
bit 1: patch control status (0=off; 1=on)
bit 0: <zero fill>

4003

4004

4005

4016

ANALOG HOUSEKEEPING TELEMETRY

Analog Telemetry Update Flags (If bit = 0, associated telemetry item is up-to-date. If bit = 1, associated telemetry item was not updated during most recent telemetry cycle - possibly due to lost frame.)
bits 31-23: <zero fill>
bit 22: motor current
bit 21: electronics current
bit 20: blackbody temperature, channel 5
bit 19: detector #5 bias voltage
bit 18: blackbody temperature, channel 4
bit 17: blackbody temperature, channel 3B
bit 16: A/D converter temperature
bit 15: blackbody temperature 4
bit 14: blackbody temperature 3
bit 13: blackbody temperature 2
bit 12: blackbody temperature 1
bit 11: motor housing temperature
bit 10: baseplate temperature
bit 9: electronics temperature
bit 8: cooler housing temperature
bit 7: radiator temperature
bit 6: patch temperature
bit 5: earth shield position
bit 4: patch temperature extended
bit 3: detector #4 bias voltage
bit 2: reference voltage
bit 1: patch power
bit 0: <zero fill>

4017

4020

Patch Temperature (range: 0 - 255)

4021

counts

Patch Temperature Extended (range: 0 - 255)

4022

counts

Patch Power (range: 0 - 255)

4023

counts

Radiator Temperature (range: 0 - 255)

4024

counts

Black Body Temperature 1 (range: 0 - 255)

4025

counts

Black Body Temperature 2 (range: 0 - 255)

4026

counts

Black Body Temperature 3 (range: 0 - 255)

4027

counts

Black Body Temperature 4 (range: 0 - 255)

4028

counts

Electronics Current (range: 0 - 255)

4029

counts

Motor Current (range: 0 - 255)

4030

counts

Earth Shield Position (range: 0 - 255)

4031

counts

Electronics Temperature (range: 0 - 255)

4032

counts

Cooler Housing Temperature (range: 0 - 255)

4033

counts

Baseplate Temperature (range: 0 - 255)

4034

counts

Motor Housing Temperature (range: 0 - 255)

4035

counts

A/D Converter Temperature (range: 0 - 255)

4036

counts

Detector #4 Bias Voltage (range: 0 - 255)

4037

counts

Detector #5 Bias Voltage (range: 0 - 255)

4038

counts

Blackbody Temperature, Channel 3B (range: 0 - 255)

4039

counts

Blackbody Temperature, Channel 4 (range: 0 - 255)

4040

counts

Blackbody Temperature, Channel 5 (range: 0 - 255)

4041

counts

Reference Voltage (range: 0 - 255)

4042

counts

4043

4048

CLOUDS FROM AVHRR (CLAVR)

<Reserved> [CLAVR Status Bit Field] bits 31-1: <undefined>
bit 0: CLAVR status (0=disable, CCM codes zero-filled; 1=enable)

4049

4052

<Reserved> [CLAVR]

4053

4056

<Reserved> [CLAVR CCM (Clear/Cloudy/Mixed) Codes (0=clear;1=mixed clear; 2=mixed cloudy; 3=cloudy)]
Word 1
bits 15-14: CCM code, FOV 1
bits 13-12: CCM code, FOV 2
...
bits 1-0: CCM code, FOV 8

Word 2
bits 15-14: CCM code, FOV 9
...
bits 1-0: CCM code, FOV 16

...
(set of 8 CCM codes per word)
...

Word 52
bits 15-14: CCM code, FOV 409
bits 13-0: <zero fill>

4057

4160

FILLER

4161

4608

112

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NOAA KLM User's Guide

Section 8.3.1.4.3.2

8.3.1.4.3.2 NOAA-N Format (Version 4, post-April 28, 2005, all spacecraft)