PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 2011-12-13 NOTE = "Comments on Moon Mineralogy Mapper, Level 0 and Level 1B (Version 3.0) Data Product Archives (ERRATA.TXT)" END_OBJECT = TEXT END This file contains an accumulation of corrections and notes for the Ch-1 M3 Level 0 and Level 1B Data Product Archives. The most recent entries are listed first. 1.) Added earth-view image to EXTRAS subdirectory, January 12, 2012. 2.) Updated /INDEX/L1B_INDEX.TAB file. Addition of column containing the solar beta angle for each M3 RDN.IMG file, December 13, 2011. 3.) Level 1B calibration update November 16, 2011. 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CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T063543_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T063543_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T102544_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T102544_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T102544_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T102751_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T102751_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T102751_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T122429_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T122429_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T122429_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T122626_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T122626_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T122626_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T142043_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T142043_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T142043_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T142145_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T142145_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T142145_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T161644_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T161644_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T161644_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T183929_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T183929_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200904\L1B\M3T20090421T183929_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T083435_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T083435_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T083435_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T083505_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T083505_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T083505_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T083552_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T083552_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T083552_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T083751_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T083751_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T083751_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T103232_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T103232_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T103232_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T123035_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T123035_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200905\L1B\M3T20090516T123035_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090628T155010_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090628T155010_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090628T155010_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090628T200530_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090628T200530_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090628T200530_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090630T083026_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090630T083026_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090630T083026_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090630T083407_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090630T083407_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090630T083407_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090630T103803_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090630T103803_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090630T103803_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090630T124550_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090630T124550_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200906\L1B\M3T20090630T124550_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T094734_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T094734_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T094734_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T094918_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T094918_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T094918_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T095059_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T095059_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T095059_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T115515_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T115515_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T115515_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T140255_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T140255_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T140255_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T140357_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T140357_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090701T140357_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T141557_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T141557_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T141557_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T141802_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T141802_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T141802_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T141947_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T141947_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T141947_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T162336_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T162336_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T162336_V03_RDN.IMG CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T162420_V03_L1B.LBL CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T162420_V03_RDN.HDR CH1M3_0003\DATA\20090415_20090816\200907\L1B\M3T20090704T162420_V03_RDN.IMG Replacement of: CH1M3_0003\INDEX\L1B_INDEX.LBL CH1M3_0003\INDEX\L1B_INDEX.TAB Addition of earth observing image collected on 22 July 2009 in EXTRAS Directory: CH1M3_0003\EXTRAS\M3G20090722T021504_EARTH_IMAGE CH1M3_0003\EXTRAS\M3G20090722T021504_EARTH_IMAGE.HDR 4.) Level 1B calibration update September 30, 2011. We have developed a detector-temperature-driven empirical gain adjustment to the M3 Level 1B data. We refer to this correction as the SSC_ADJ correction and it is based on a family of spectral gain curves that are applied to each Level 1B radiance cube after its nominal radiometric calibration. Based on the detector temperature for each scene, a single curve is chosen from the family of temperature-based curves and each spectrum in the radiance cube is multiplied by this correction factor. This update should replace versions 1.0 and 2.0 of the M3 Level 1B data products. 5.) Level 1B calibration update December 31, 2010 The M3 Level 1B radiometric calibration was updated to better account for the thermal emitted energy from the laboratory calibration fixture during laboratory calibration of the M3 instrument in April 2007. This update improves the radiometric calibration of the last 5 spectral channels in the M3 Global data set. This update in calibration should replace version 1.0 of the M3 Level 1B data products delivered in June of 2010. 6.) Non-standard PDS unit, Astronomical Unit (AU), December 9, 2010 The keyword element, SOLAR_DISTANCE, contains a value that uses the Astronomical Unit (AU), a non-standard PDS unit, as the unit of measuremenet. The SOLAR_DISTANCE value is used by the M3 team as a measure of the distance to the Sun to modulate the solar irradiance. The solar flux varies a few percent (as 1/R^2) as the to-Sun distance varies from about 0.98 to 1.02 AU during the year. The AU, a basic non-SI unit of length for bodies within the solar system, is recognized by the International Astronomical Union (IAU) for use in astronomy and planetary science. The AU is also recognized by the National Institute of Standards and Technology (NIST). For more information see http://www.iau.org/science/publications/proceedings_rules/units/ http://physics.nist.gov/cuu/Units/outside.html 7.) Misnamed pointer, November 30, 2010 M3 L1B labels for Optical Period 1 (OP1) contain a misnamed pointer. For example, the pointer, ^TABLE, in the sample PDS label portion below, should be ^UTC_TIME_TABLE. /* Description of UTC timing data file */ OBJECT = UTC_FILE ^TABLE = "M3G20090201T064933_V01_TIM.TAB" ... OBJECT = UTC_TIME_TABLE ... END_OBJECT = UTC_TIME_TABLE END_OBJECT = UTC_FILE 8.) Level 1B Data Product Archives, November 3, 2010 Replacement of entire contents of CH1M3_0001\EXTRAS\BROWSE directory. The following images have been replaced in the L1B directories due to a mismatch of image lines between RDN.IMG and LOC.IMG/OBS.IMG products: CH1M3_0001\DATA\20081118_20090214\200811\L1B\M3G20081124T023353_V01_L1B.LBL CH1M3_0001\DATA\20081118_20090214\200811\L1B\M3G20081124T023353_V01_RDN.HDR CH1M3_0001\DATA\20081118_20090214\200811\L1B\M3G20081124T023353_V01_RDN.IMG CH1M3_0001\DATA\20081118_20090214\200811\L1B\M3G20081124T023528_V01_L1B.LBL CH1M3_0001\DATA\20081118_20090214\200811\L1B\M3G20081124T023528_V01_RDN.HDR CH1M3_0001\DATA\20081118_20090214\200811\L1B\M3G20081124T023528_V01_RDN.IMG CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090207T101211_V01_L1B.LBL CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090207T101211_V01_RDN.HDR CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090207T101211_V01_RDN.IMG CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090207T101751_V01_L1B.LBL CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090207T101751_V01_RDN.HDR CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090207T101751_V01_RDN.IMG CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T193851_V01_L1B.LBL CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T193851_V01_RDN.HDR CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T193851_V01_RDN.IMG CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T194335_V01_L1B.LBL CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T194335_V01_RDN.HDR CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T194335_V01_RDN.IMG CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T201331_V01_L1B.LBL CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T201331_V01_RDN.HDR CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T201331_V01_RDN.IMG CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T204328_V01_L1B.LBL CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T204328_V01_RDN.HDR CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T204328_V01_RDN.IMG CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T233450_V01_L1B.LBL CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T233450_V01_RDN.HDR CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T233450_V01_RDN.IMG CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T233940_V01_L1B.LBL CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T233940_V01_RDN.HDR CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090208T233940_V01_RDN.IMG CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090209T000934_V01_L1B.LBL CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090209T000934_V01_RDN.HDR CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090209T000934_V01_RDN.IMG CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090209T003927_V01_L1B.LBL CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090209T003927_V01_RDN.HDR CH1M3_0001\DATA\20081118_20090214\200902\L1B\M3G20090209T003927_V01_RDN.IMG Replacement of: CH1M3_0001\INDEX\INDXINFO.TXT CH1M3_0001\INDEX\L0_INDEX.LBL CH1M3_0001\INDEX\L0_INDEX.TAB CH1M3_0001\INDEX\L1B_INDEX.LBL CH1M3_0001\INDEX\L1B_INDEX.TAB 9.) Level 0 Data Product Archives, October 19, 2010 The format of the line prefix header, included in all M3 Level 0 Data Products, is not describable using existing PDS3 data types. The Indian Space Research Organisation (ISRO), creator of the data, uses a non-PDS standard for capturing and organizing these values within the header. Given that the M3 mission was of an international nature, the M3 team along with the PDS, had no authority to obligate ISRO to conform to the American PDS standards. Therefore, for the sake of our current PDS data users and those in the future, we have documented a description of the L0 data prefix header structure in various places within this archive. This includes the M3_L0_TIME_DECODING.TXT file within the DOCUMENT sub-directory, the LN_PRFX_HDR.FMT file within the LABEL sub-directory and the ERRATA.TXT file here, which you are now viewing. Detailed description of format and usage of M3 raw time data. ------------------------------------------------------------- The raw time data in M3 L0 data are stored in three fields comprised of 6, 8 and 8 bytes respectively. These three fields carry the 22 bytes of raw data that record the CH-1 clock tick at the once-per-minute synch mark, the M3 clock tick at the once-per-minute synch mark and the M3 clock tick at the image frame time. The 22 bytes of raw clock data are embedded in consecutive bytes of the 1280-byte prefix that precedes each M3 image frame (line) in the L0 data images. The 22 bytes start at byte 641 (using 1-based indexing, i.e. 1 to 1280) in each frame prefix. All other bytes in the 1280-byte frame prefixes are all zero values. The first two values are used to develop the CH-1 clock to M3 clock regression in the Level 1B processing. The third value is used to time tag each image frame in M3 ticks, then CH-1 ticks via the regression and finally in real time via the clock kernel that is built from raw on-board-time versus Earth-received time data provided by ISRO. The clock kernel is in the Level 1B PDS volume. This text describes how the 22 bytes of timing data are formatted and can be converted into the three clock tick values. Here we detail an example where the 22 bytes of raw timing data are: 112, 199, 165, 30, 116, 78, 0, 0, 251, 154, 2, 228, 65, 110, 0, 0, 251, 156, 3, 140, 8, 44. I) CH-1 Clock Ticks at Sync Mark The first six bytes are the raw CH-1 clock tick at the most recent once-per-minute sync pulse, encoded in MIL-STD-1750a Extended Precision Float format. These are bytes 641-646 of the 1280-byte frame prefix. Bytes 1, 2, 3 are the most significant part of the mantissa in 2's-complement format. Byte 4 is the 2's-complement format exponent. Bytes 5, 6 are the least significant portion of the mantissa in 2's-complement format. A detailed example of building the value follows for a six-byte set of values of 112, 199, 165, 30, 116 and 78, in order. Since we expect only positive values for the mantissa and exponent, bytes 1 and 4 should never exceed 127. The mantissa is built from bytes 1, 2, 3, 5, 6 in order of most significant to least significant. The exponent is byte 4. Mantissa = (112 * 2^32 + 199 * 2^24 + 165 * 2^16 + 116 * 2^8 + 78 * 2^0)/2^39 = 484,385,846,350 / 549,755,813,888 = 0.881092721738 Exponent = 30 Value = Mantissa * 2^Exponent = 0.881092721738 * 2^30 = 946066106.15234375 This value represents the CH-1 clock tick count at the most recent sync pulse. The nominal CH-1 tick rate is 1000Hz, but fractional ticks are reported suggesting the real clock had higher precision intervals. The CH-1 clock rolled over to zero every 21 days (modulo 1,814,400,000 = 21 days/cycle * 24 hours/day * 3600 seconds/hour * 1000 ticks/second). II) M3 Clock Ticks at Sync Mark The next eight bytes in the frame prefix (bytes 647-654) encode the M3 clock tick at the most recent sync pulse. The value is encoded as an integer but in a non-standard manner across the eight bytes. The first and second set of four bytes in the eight-byte sequence are used to form two long integers. Then the first is promoted by 2^26 as it counts the number of times the M3 tick counter rolls over at that value. The second integer is the least significant part and rolls over to zero at 2^26 - 1, when the upper integer is correspondingly incremented. A detailed example of building the tick count value follows for an eight-byte set of values of 0, 0, 251, 154, 2, 228, 65 and 110, in order. The most significant part is formed from promoting the long integer of bytes 1, 2, 3, 4 by a factor of 2^26. The least significant portion is the long integer formed by the last four bytes (5, 6, 7, 8). The value is the sum of these two integers. Most Significant Part = (0 * 2^24 + 0 * 2^16 + 251 * 2^8 + 154 * 2^0) * 2^26 = 64410 * 67108864 = 4322481930240 Least Significant Part = 2 * 2^24 + 228 * 2^16 + 65 * 2^8 + 110 * 2^0 = 48513390 Value = Most Significant Part + Least Significant Part = 4322481930240 + 48513390 = 4322530443630 The nominal M3 tick rate was 12MHz. The M3 clock did not rollover during the mission. III) M3 Clock Ticks at Frame Time The final eight bytes of the 22 raw timing bytes (bytes 655-662) encode the M3 clock tick at the image frame time. The value is encoded in the exact manner as the M3 Clock at Sync Mark previously described. In the example being worked for clarity, these eight bytes are 0, 0, 251, 156, 3, 140, 8, 44. Most Significant Part = (0 * 2^24 + 0 * 2^16 + 251 * 2^8 + 156 * 2^0) * 2^26 = 64412 * 67108864 = 4322616147968 Least Significant Part = 2 * 2^24 + 228 * 2^16 + 65 * 2^8 + 110 * 2^0 = 59508780 Value = Most Significant Part + Least Significant Part = 4322616147968 + 59508780 = 4322675656748 This frame is approximately 12.101093 seconds after the most recent sync pulse, using the nominal 12 MHz M3 clock rate. (4322675656748 - 4322530443630) / 12000000 = 12.101093 In practice we use a per-image regression between M3 ticks and CH-1 ticks to convert the per-frame M3 ticks to equivalent CH-1 ticks. This regression accommodates any drift in the relative clock rates and their stability. Then the derived CH-1 ticks are converted to real time via the clock kernel, in the Level 1B PDS Archive, that relates CH-1 ticks to TDT time.