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NOAA KLM User's GuideSection 8.3.1.3.3 |
Introduction Page,
NOAA KLM TOC, Acronyms
The Data Records for LAC and HRPT data sets are archived in packed format to reduce storage requirements. Three 10-bit sensor samples are stored in a 32-bit word using the Band Interleaved by Pixel (BIP) method. The format for packed data sets is documented in Table 8.3.1.3.3-1. However, this format is inconvenient for data processing.
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Table 8.3.1.3.3-1. Format of packed LAC/HRPT Data Sets. | ||||||
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Start Octet |
End Octet |
DT |
Word Size |
SF |
Number of Words |
SCAN LINE INFORMATION |
| 1 | 2 | u | 2 | 0 | 1 | Scan Line Number (cumulative, starting with 1) |
| 3 | 4 | u | 2 | 0 | 1 | Scan Line Year (e.g., 1999) |
| 5 | 6 | u | 2 | 0 | 1 | Scan Line Day of Year (e.g., 365) |
| 7 | 8 | i | 2 | 0 | 1 | Satellite Clock Drift Delta in milliseconds |
| 9 | 12 | u | 4 | 0 | 1 | Scan Line UTC Time of Day in milliseconds |
| 13 | 14 | u | 2 | 0 | 1 | Scan Line Bit Field bit 15: 0 = northbound data; 1 = southbound data bit 14: 1 = scan time corrected for clock drift bits 13-2: <zero fill> bits 1-0: channel 3 select (0 = 3b; 1 = 3a; 2 = transition) |
| 15 | 24 | i | 2 | 0 | 5 | <Zero Fill> |
| . | . | . | . | . | . |
QUALITY INDICATORS |
| 25 | 28 | u | 4 | 0 | 1 | Quality Indicator Bit Field If a bit is on (=1) then 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 bit 23: frame sync word error greater than zero bit 22: frame sync previously dropped lock bit 21: flywheeling detected during this frame bit 20: bit slippage detected during this frame bits 19-9: <zero fill> 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 bit 0: pseudo noise occurred on this frame |
| 29 | 32 | u | 4 | 0 | 1 | Scan Line Quality Flags If a bit is on (=1) then the statement is true. Time Problem Code (All bits off implies the scan time is as expected.) bits 31-24: <zero fill> bit 23: time field is bad but can probably be inferred from the previous good time. bit 22: time field is bad and can't be inferred from the previous good time. bit 21: this record starts a sequence that is inconsistent with previous times (i.e., there is a time discontinuity). This may or may not be associated with a spacecraft clock update. (See bit 26, Quality Indicator Bit Field) bit 20: start of a sequence that apparently repeats scan times that have been previously accepted. bits 19-16: <zero fill> Calibration Problem Code (Note these bits complement the channel indicators; all bits set to 0 indicates normal calibration.) bit 15: scan line was not calibrated because of bad time. bit 14: scan line was calibrated using fewer than the preferred number of scan lines because of proximity to start or end of data set or to a data gap. bit 13: scan line was not calibrated because of bad or insufficient PRT data. bit 12: scan line was calibrated but with marginal PRT data. bit 11: some uncalibrated channels on this scan (see channel indicators) bits 10-8: <zero fill> Earth Location Problem Code (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 because of questionable time code. (See time problem flags above). bit 5: earth location questionable -- only marginal agreement with reasonableness check. bit 4: earth location questionable -- fails reasonableness check. bits 3-0: <zero fill> |
| 33 | 38 | u | 2 | 0 | 3 | 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> Word 2: Channel 4 Word 3: Channel 5 |
| 39 | 40 | u | 2 | 0 | 1 | Count of Bit Errors in Frame Sync |
| 41 | 48 | i | 4 | 0 | 2 | <Zero Fill> |
| . | . | . | . | . | . |
CALIBRATION COEFFICIENTS |
| 49 | 52 | i | 4 | 7 | 1 | Visible Operational Cal Ch 1 Slope 1 |
| 53 | 56 | i | 4 | 6 | 1 | Visible Operational Cal Ch 1 Intercept 1 |
| 57 | 60 | i | 4 | 7 | 1 | Visible Operational Cal Ch 1 Slope 2 |
| 61 | 64 | i | 4 | 6 | 1 | Visible Operational Cal Ch 1 Intercept 2 |
| 65 | 68 | i | 4 | 0 | 1 | Visible Operational Cal Ch 1 Intersection |
| 69 | 72 | i | 4 | 7 | 1 | Visible Test Cal Ch 1 Slope 1 |
| 73 | 76 | i | 4 | 6 | 1 | Visible Test Cal Ch 1 Intercept 1 |
| 77 | 80 | i | 4 | 7 | 1 | Visible Test Cal Ch 1 Slope 2 |
| 81 | 84 | i | 4 | 6 | 1 | Visible Test Cal Ch 1 Intercept 2 |
| 85 | 88 | i | 4 | 0 | 1 | Visible Test Cal Ch 1 Intersection |
| 89 | 92 | i | 4 | 7 | 1 | Visible Prelaunch Cal Ch 1 Slope 1 |
| 93 | 96 | i | 4 | 6 | 1 | Visible Prelaunch Cal Ch 1 Intercept 1 |
| 97 | 100 | i | 4 | 7 | 1 | Visible Prelaunch Cal Ch 1 Slope 2 |
| 101 | 104 | i | 4 | 6 | 1 | Visible Prelaunch Cal Ch 1 Intercept 2 |
| 105 | 108 | i | 4 | 0 | 1 | Visible Prelaunch Cal Ch 1 Intersection |
| 109 | 112 | i | 4 | 7 | 1 | Visible Operational Cal Ch 2 Slope 1 |
| 113 | 116 | i | 4 | 6 | 1 | Visible Operational Cal Ch 2 Intercept 1 |
| 117 | 120 | i | 4 | 7 | 1 | Visible Operational Cal Ch 2 Slope 2 |
| 121 | 124 | i | 4 | 6 | 1 | Visible Operational Cal Ch 2 Intercept 2 |
| 125 | 128 | i | 4 | 0 | 1 | Visible Operational Cal Ch 2 Intersection |
| 129 | 132 | i | 4 | 7 | 1 | Visible Test Cal Ch 2 Slope 1 |
| 133 | 136 | i | 4 | 6 | 1 | Visible Test Cal Ch 2 Intercept 1 |
| 137 | 140 | i | 4 | 7 | 1 | Visible Test Cal Ch 2 Slope 2 |
| 141 | 144 | i | 4 | 6 | 1 | Visible Test Cal Ch 2 Intercept 2 |
| 145 | 148 | i | 4 | 0 | 1 | Visible Test Cal Ch 2 Intersection |
| 149 | 152 | i | 4 | 7 | 1 | Visible Prelaunch Cal Ch 2 Slope 1 |
| 153 | 156 | i | 4 | 6 | 1 | Visible Prelaunch Cal Ch 2 Intercept 1 |
| 157 | 160 | i | 4 | 7 | 1 | Visible Prelaunch Cal Ch 2 Slope 2 |
| 161 | 164 | i | 4 | 6 | 1 | Visible Prelaunch Cal Ch 2 Intercept 2 |
| 165 | 168 | i | 4 | 0 | 1 | Visible Prelaunch Cal Ch 2 Intersection |
| 169 | 172 | i | 4 | 7 | 1 | Visible Operational Cal Ch 3a Slope 1 |
| 173 | 176 | i | 4 | 6 | 1 | Visible Operational Cal Ch 3a Intercept 1 |
| 177 | 180 | i | 4 | 7 | 1 | Visible Operational Cal Ch 3a Slope 2 |
| 181 | 184 | i | 4 | 6 | 1 | Visible Operational Cal Ch 3a Intercept 2 |
| 185 | 188 | i | 4 | 0 | 1 | Visible Operational Cal Ch 3a Intersection |
| 189 | 192 | i | 4 | 7 | 1 | Visible Test Cal Ch 3a Slope 1 |
| 193 | 196 | i | 4 | 6 | 1 | Visible Test Cal Ch 3a Intercept 1 |
| 197 | 200 | i | 4 | 7 | 1 | Visible Test Cal Ch 3a Slope 2 |
| 201 | 204 | i | 4 | 6 | 1 | Visible Test Cal Ch 3a Intercept 2 |
| 205 | 208 | i | 4 | 0 | 1 | Visible Test Cal Ch 3a Intersection |
| 209 | 212 | i | 4 | 7 | 1 | Visible Prelaunch Cal Ch 3a Slope 1 |
| 213 | 216 | i | 4 | 6 | 1 | Visible Prelaunch Cal Ch 3a Intercept 1 |
| 217 | 220 | i | 4 | 7 | 1 | Visible Prelaunch Cal Ch 3a Slope 2 |
| 221 | 224 | i | 4 | 6 | 1 | Visible Prelaunch Cal Ch 3a Intercept 2 |
| 225 | 228 | i | 4 | 0 | 1 | Visible Prelaunch Cal Ch 3a Intersection |
| 229 | 232 | i | 4 | 6 | 1 | IR Operational Cal Ch 3b Coefficient 1 |
| 233 | 236 | i | 4 | 6 | 1 | IR Operational Cal Ch 3b Coefficient 2 |
| 237 | 240 | i | 4 | 6 | 1 | IR Operational Cal Ch 3b Coefficient 3 |
| 241 | 244 | i | 4 | 6 | 1 | IR Test Cal Ch 3b Coefficient 1 |
| 245 | 248 | i | 4 | 6 | 1 | IR Test Cal Ch 3b Coefficient 2 |
| 249 | 252 | i | 4 | 6 | 1 | IR Test Cal Ch 3b Coefficient 3 |
| 253 | 256 | i | 4 | 6 | 1 | IR Operational Cal Ch 4 Coefficient 1 |
| 257 | 260 | i | 4 | 6 | 1 | IR Operational Cal Ch 4 Coefficient 2 |
| 261 | 264 | i | 4 | 6 | 1 | IR Operational Cal Ch 4 Coefficient 3 |
| 265 | 268 | i | 4 | 6 | 1 | IR Test Cal Ch 4 Coefficient 1 |
| 269 | 272 | i | 4 | 6 | 1 | IR Test Cal Ch 4 Coefficient 2 |
| 273 | 276 | i | 4 | 6 | 1 | IR Test Cal Ch 4 Coefficient 3 |
| 277 | 280 | i | 4 | 6 | 1 | IR Operational Cal Ch 5 Coefficient 1 |
| 281 | 284 | i | 4 | 6 | 1 | IR Operational Cal Ch 5 Coefficient 2 |
| 285 | 288 | i | 4 | 6 | 1 | IR Operational Cal Ch 5 Coefficient 3 |
| 289 | 292 | i | 4 | 6 | 1 | IR Test Cal Ch 5 Coefficient 1 |
| 293 | 296 | i | 4 | 6 | 1 | IR Test Cal Ch 5 Coefficient 2 |
| 297 | 300 | i | 4 | 6 | 1 | IR Test Cal Ch 5 Coefficient 3 |
| 301 | 312 | i | 4 | 0 | 3 | <Zero Fill> |
| . | . | . | . | . | . |
NAVIGATION |
| 313 | 316 | u | 4 | 0 | 1 | Navigation Status Bit Field bits 31-17: <zero fill> bit 16: 1 = earth location corrected for TIP Euler angles bits 15 - 12: earth location indicator (0 = earth location available; 1 = user ephemeris files greater than 24 hours old; 2 = no earth location available) bits 11 - 8: spacecraft attitude control (0 = operating in YGC or NOMINAL mode; 1 = operating in another mode; 2 = attitude exceeds nominal tolerance; 3 = both 1 and 2) 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) |
| 317 | 320 | u | 4 | 0 | 1 | Time Associated with TIP Euler Angles (Seconds) |
| 321 | 326 | i | 2 | 3 | 3 | TIP Euler Angles in Degrees Word 1: Roll Word 2: Pitch Word 3: Yaw |
| 327 | 328 | u | 2 | 1 | 1 | Spacecraft Altitude above Reference Ellipsoid in km |
| 329 | 634 | i | 2 | 2 | 153 | Angular Relationships (relative azimuth range +/- 180.00 degrees) Word 1: Solar Zenith Angle, Point 25 Word 2: Satellite Zenith Angle, Point 25 Word 3: Relative Azimuth Angle, Point 25 Word 4: Solar Zenith Angle, Point 65 ... (set of 3 angles every 40 points) ... Word 153: Relative Azimuth Angle, Point 2025 |
| 635 | 640 | i | 2 | 0 | 3 | <Zero Fill> |
| 641 | 1048 | i | 4 | 4 | 102 | Earth Location (North latitude and East longitude are positive) Word 1: Latitude in Degrees, Point 25 Word 2: Longitude in Degrees, Point 25 Word 3: Latitude in Degrees, Point 65 ... (lat/lon word pair every 40 points) ... Word 102: Longitude in Degrees, Point 2025 |
| 1049 | 1056 | i | 4 | 0 | 2 | <Zero Fill> |
| . | . | . | . | . | . |
HRPT MINOR FRAME TELEMETRY |
| 1057 | 1068 | u | 2 | 0 | 6 | Frame Sync The first sixty bits (six 10-bit values: 644, 367, 860, 413, 527, 149) from a 63 bit pseudonoise generator starting in the all 1's state. The generator polynomial is: x6 + x5 + x2 + 1 |
| 1069 | 1072 | u | 2 | 0 | 2 | ID Word 1 bits 15-10: <zero fill> bit 9: 0 = internal sync; 1 = AVHRR sync bits 8-7: 0 = not an HRPT frame but a GAC frame; 1 = minor frame 1; 2 = minor frame 2; 3 = minor frame 3 bits 6-3: spacecraft address bit 2: 0 = frame stable; 1 = frame resync occurred bit 1: 0 = pseudonoise AVHRR input; 1 = normal AVHRR input bit 0: 0 = AVHRR Ch 3b; 1 = AVHRR Ch 3a Word 2 bits 15-10: <zero fill> bits 9-0: <undefined> |
| 1073 | 1080 | u | 2 | 0 | 4 | Time Code Word 1 bits 15-10: <zero fill> bits 9-1: binary day count bit 0 = 0 Word 2 bits 15-10: <zero fill> bit 9 = 1 bit 8 = 0 bit 7 = 1 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 |
| 1081 | 1100 | u | 2 | 0 | 10 | Telemetry Word 1: Ramp Calibration AVHRR Channel 1 Word 2: Ramp Calibration AVHRR Channel 2 Word 3: Ramp Calibration AVHRR Channel 3 Word 4: Ramp Calibration AVHRR Channel 4 Word 5: Ramp Calibration AVHRR Channel 5 Words 6-9 AVHRR Internal Target Temperature Data 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 6: PRT Reading 1 Word 7: PRT Reading 2 Word 8: PRT Reading 3 Word 9: Patch Temperature Word 10: <undefined> |
| 1101 | 1160 | u | 2 | 0 | 30 | Back Scan Ten words of calibration target view data from each AVHRR channel 3, 4, 5. Word 1: Channel 3, Word 1 ... Word 3: Channel 5, Word 1 Word 4: Channel 3, Word 2 ... Word 30: Channel 5, Word 10 |
| 1161 | 1260 | u | 2 | 0 | 50 | Space Data Ten words of space view data from each AVHRR channel 1, 2, 3, 4, 5 Word 1: Channel 1, Word 1 ... Word 5: Channel 5, Word 1 Word 6: Channel 1, Word 2 ... Word 50: Channel 5, Word 10 |
| 1261 | 1262 | u | 2 | 0 | 1 | Sync Delta bits 15-10: <zero fill> bit 9: 0 = AVHRR sync early; 1 = AVHRR sync late bits 8-0: 9-bit binary count of 0.9984 MHz periods |
| 1263 | 1264 | i | 2 | 0 | 1 | <Zero Fill> |
| . | . | . | . | . | . |
AVHRR SENSOR DATA |
| 1265 | 14920 | u | 4 | 0 | 3414 | Sensor Data, Band Interleaved by Pixel (BIP) Word 1 bits 31-30: <zero fill> bits 29-20: Channel 1, Point 1 bits 19-10: Channel 2, Point 1 bits 9-0: Channel 3, Point 1 Word 2 bits 31-30: <zero fill> bits 29-20: Channel 4, Point 1 bits 19-10: Channel 5, Point 1 bits 9-0: Channel 1, Point 2 ... Word 3414 bits 31-30: <zero fill> bits 29-20: Channel 5, Point 2048 |
| 14921 | 14928 | i | 4 | 0 | 2 | <Zero Fill> |
| . | . | . | . | . | . |
DIGITAL B TELEMETRY |
| 14929 | 14930 | u | 2 | 0 | 1 | Invalid Word Bit Flags (if bit = 1, associated telemetry bit was not updated during most recent minor frame cycle - possibly due to lost frame) bit 15: motor/telemetry bit 14: electronics/telemetry 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 calibrate status bit 5: cooler heat bit 4: scan motor bit 3: telemetry lock bit 2: earth shield bit 1: patch control bit 0: <zero fill> |
| 14931 | 14932 | u | 2 | 0 | 1 | AVHRR Digital B Data bit 15: motor/telemetry (0 = off; 1 = on) bit 14: electronics/telemetry (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 calibrate status (0 = off; 1 = on) bit 5: cooler heat (0 = off; 1 = on) bit 4: scan motor (0 = low; 1 = high) bit 3: telemetry lock (0 = off; 1 = lock) bit 2: earth shield (0 = disable; 1 = deploy) bit 1: patch control (0 = off; 1 = on) bit 0: <zero fill> |
| 14933 | 14944 | i | 4 | 0 | 3 | <Zero Fill> |
| . | . | . | . | . | . |
ANALOG HOUSEKEEPING DATA (TIP) |
| 14945 | 14948 | u | 4 | 0 | 1 | Invalid Word Bit Flags (if bit = 1, associated telemetry word was not updated during most recent minor frame cycle - possibly due to lost frame) bits 31 - 23: <zero fill> bit 22: reference voltage (word 22) bits 21-2: words 21 through 2 (in order) bit 1: patch temperature (word 1) bit 0: <zero fill> |
| 14949 | 14970 | u | 1 | 0 | 22 | Word 1: Patch Temperature Word 2: Patch Temperature Extended Word 3: Patch Power Word 4: Radiator Temperature Word 5: Black Body Temperature 1 Word 6: Black Body Temperature 2 Word 7: Black Body Temperature 3 Word 8: Black Body Temperature 4 Word 9: Electronics Current Word 10: Motor Current Word 11: Earth Shield Position Word 12: Electronics Temperature Word 13: Cooler Housing Temperature Word 14: Baseplate Temperature Word 15: Motor Housing Temperature Word 16: A/D Converter Temperature Word 17: Detector #4 Bias Voltage Word 18: Detector #5 Bias Voltage Word 19: Channel 3b Blackbody View Word 20: Channel 4 Blackbody View Word 21: Channel 5 Blackbody View Word 22: Reference Voltage |
| 14971 | 14976 | i | 2 | 0 | 3 | <Zero Fill> |
| . | . | . | . | . | . |
CLOUDS FROM AVHRR (CLAVR) |
| 14977 | 14980 | u | 4 | 0 | 1 | <Reserved> CLAVR Status Bit Field 1 bits 31 - 1: <undefined> bit 0: CLAVR status (0 = disable, CCM codes zero-filled; 1 = enable) |
| 14981 | 14984 | u | 4 | 0 | 1 | <Reserved> |
| 14985 | 15496 | u | 2 | 0 | 256 | <Reserved> CCM (Clear/Cloudy/Mixed) Codes (0 = unknown; 1 = clear; 2 = cloudy; 3 = partly cloudy) Word 1 bits 15-14: CCM Point 1 ... bits 1-0: CCM Point 8 ... (set of 8 CCM Codes per word) ... Word 256 bits 15-14: CCM Point 2041 ... bits 1-0: CCM Point 2048 |
| . | . | . | . | . | . |
FILLER |
| 15497 | 15872 | i | 4 | 0 | 94 | <Zero Fill> 1 |
| Notes (Revision History):
1 13Nov1998: Redefine reserved CLAVR section to include CLAVR Status Bit Field (Fagan, 24Sep1998); adjust trailing zero-fill | ||||||
Tables 8.3.1.3.3-2 and 8.3.1.3.3-3 (containing the 8 and 16-bit unpacked structure, respectively) summarize how the selection of channel and sensor data word size affects the data set structure documented in Table 8.3.1.3.3-1. While the alignment of data words on eight octet boundaries is maintained by adding binary zero-fill after the sensor data section, in the interests of minimizing data set size the record lengths are no longer restricted to multiples of 512 octets.
| Number of Channels | 1 | 2 | 3 | 4 | 5 |
| Pre-Data | 1 - 1264 | 1 - 1264 | 1 - 1264 | 1 - 1264 | 1 - 1264 |
| Sensor Data | 1265 - 3312 | 1265 - 5360 | 1265 - 7408 | 1265 - 9456 | 1265 - 11504 |
| Alignment Zero-Fill | 3313-3320 | 5361-5368 | 7409-7416 | 9457-9464 | 11505-11512 |
| Post-Data | 3321-3880 | 5369-5928 | 7417-7976 | 9465-10024 | 11513-12072 |
| Trailing Zero-Fill | 3881-4096 | 5929-6144 | 7977-8192 | 10025-10240 | 12073-12288 |
| Record Length | 4096 | 6144 | 8192 | 10240 | 12288 |
| Number of Channels | 1 | 2 | 3 | 4 | 5 |
| Pre-Data | 1 - 1264 | 1 - 1264 | 1 - 1264 | 1 - 1264 | 1 - 1264 |
| Sensor Data | 1265 - 5360 | 1265 - 9456 | 1265 - 13552 | 1265 - 17648 | 1265 - 21744 |
| Alignment Zero-Fill | 5361-5368 | 9457-9464 | 13553-13560 | 17649-17656 | 21745-21752 |
| Post-Data | 5369-5928 | 9465-10024 | 13561-14120 | 17657-18216 | 21753-22312 |
| Trailing Zero-Fill | 5929-6144 | 10025-10240 | 14121-14336 | 18217-18432 | 22313-22528 |
| Record Length | 6144 | 10240 | 14336 | 18432 | 22528 |
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