urn:nasa:pds:mess_mascs:data_ddr:virsvd_ob4_14350_084151 1.0 1.11.0.0 Product_Observational 2019-10-11 1.0 This label was modified to convert to PDS4. 2014-12-16T08:41:52Z 2014-12-16T09:02:41Z Science Derived Visible Atmosphere Atmospheres Structure MESSENGER Mission urn:nasa:pds:context:investigation:mission.messenger data_to_investigation MESS MASCS Instrument urn:nasa:pds:context:instrument:instrument.mascs__mess is_instrument MESSENGER Spacecraft urn:nasa:pds:context:instrument_host:spacecraft.mess is_instrument_host MERCURY Planet urn:nasa:pds:context:target:planet.mercury data_to_target Mercury Orbit Year 4 2/061043308.225 2/061044557.009 VIRSDVIS PIPE-MASCS2DDR 1.0 CK msgr20141215.bc CK msgr20141216.bc CK msgr20141217.bc FK msgr_dyn_v600.tf FK msgr_v231.tf IK msgr_mascs_v100.ti LSK naif0011.tls PCK pck00010_MSGR_v21.tpc SCLK messenger_2548.tsc SPK msgr_20040803_20150430_od431sc_2.bsp All MESSENGER geometry data are contained in a separate data set. This data set was cumulatively delivered in conjunction with each archive delivery as described in the MESSENGER Data Management and Archiving Plan (DMAP). This data set contains geometry data in the form of SPICE kernels. The data set is archived by the PDS NAIF Node in the MESSSP_1000 volume, PDS data set ID MESS-E/V/H/SPICE-6-V1.0. It is available from the NAIF online archives at http://naif.jpl.nasa.gov. urn:nasa:pds:mess_mascs:document:virs_ddr_ds.cat data_to_document data set catalog file urn:nasa:pds:mess_mascs:document:virsvd.fmt data_to_document format file containing column information virsvd_ob4_14350_084151.dat virsvd_ob4_14350_084151_file 2017-03-24T18:51:43Z 5814648 556 virsvd_ob4_14350_084151_table_binary 0 556 This table contains MESSENGER VIRS spectra collected in the visible wavelength, converted to reflectance and photometrically normalized as well as instrument engineering data. Detailed descriptions for the parameters defined below are contained in the CDR/DDR SIS document. The complete column definitions are contained in an external file found in the LABEL directory of the archive volume. 26 7 10458 SC_TIME 1 1 UnsignedMSB4 4 Spacecraft time in integer seconds that is transmitted to MESSENGER subsystems by the Integrated Electronics Module. This is assigned to the first spectral observation contained in a science packet. All spectra contained in the science packet will be associated with this start time. Unit is in Mission Elapsed Time which is the number of seconds since launch. PACKET column. PACKET_SUBSECONDS 2 5 UnsignedMSB2 2 Subsecond time in milliseconds that the telemetry packet was initiated. All spectra contained in the science packet will be associated with this subsecond start time. Unit is 5 milliseconds (i.e. all values will be to the nearest 5 milliseconds). PACKET column. INT_TIME 3 7 UnsignedMSB2 2 Amount of time the array detectors will integrate photon counts. Unit is 0.05 second. OBSERVATION column. INT_COUNT 4 9 UnsignedMSB2 2 Total amount of integrations that will be taken. OBSERVATION column. DARK_FREQ 5 11 UnsignedMSB2 2 Dark counts will be collected every X integrations during a VIRS observation. OBSERVATION column. TEMP_2 6 13 IEEE754MSBSingle 4 One of a redundant pair of array temperature sensors. A more complete description of this field can be found in the MASCS User\\s Guide (Applicable Document 6 in VIRS_CDR_DDR_DAP_SIS.PDF). Conversion from raw counts (DN) to degrees Celsius is: For the VIS detector it is: -3.34338E-18 * DN^5 + 8.979E-15 * DN^4 + 3.8131E-11 * DN^3 - 2.703E-8 * DN^2 - 0.0061 * DN - 1.67826 For the NIR detector it is: TEMP_2 = -8.89100589E-18 * DN^5 - 9.72043502E-15 * DN^4 + 1.73862825E-10 * DN^3 + 3.39958815E-7 * DN^2 - 0.00702301101 * DN - 22.2879012 For other temperature data (TEMP_1 and GRATING_TEMP) see CDR. PER SPECTRUM column. BINNING 7 17 UnsignedMSB2 2 Number of pixels that were binned together in the data. A flight-software update during the mission changed how the pixels are were binned. For data with SPECTRUM_UTC_TIME prior to March 16, 2009, the pixels were co-added. For data with SPECTRUM_UTC_TIME on or after March 16, 2009, the multiple pixels were averaged. OBSERVATION column. START_PIXEL 8 19 UnsignedMSB2 2 Start pixel of data captured by the detector array. For VIS the value can be from 0-511. For NIR the value can be from 0-255. OBSERVATION column. END_PIXEL 9 21 UnsignedMSB2 2 End pixel of data captured by the detector array. For VIS the value can be from 0-511. For NIR the value can be from 0-255. The END_PIXEL must be greater than START_PIXEL. OBSERVATION column. SPECTRUM_NUMBER 10 23 UnsignedMSB2 2 Ordered number sequence for spectra in a given observation. First spectrum is 0, second is 1, third is 2, and so on. Note that for observations which span multiple science packets, the numbering sequence is continuous. PER SPECTRUM column. SPECTRUM_MET 11 25 UnsignedMSB4 4 A calculated value intended to reflect mission elapsed time (in seconds) since launch (for partition 1) or since reset (for partition 2) at the start of an individual VIRS spectrum. This is derived using the following formula: SPECTRUM_MET = SC_TIME + floor(SPECTRUM_NUMBER*PERIOD*0.050) PER SPECTRUM column. SPECTRUM_SUBSECONDS 12 29 UnsignedMSB2 2 The calculated subsecond time in milliseconds that a VIRS integration was started. For each VIRS integration, SPECTRUM_MET plus SPECTRUM_SUBSECONDS gives the spacecraft time of the start of that integration. This is derived using the following formula: SPECTRUM_SUBSECONDS = (PACKET_SUBSECONDS + SPECTRUM_NUMBER * PERIOD * 50) mod 1000 PER SPECTRUM column. SPECTRUM_UTC_TIME 13 31 ASCII_String 17 UTC time in YYDOYTHH:MM:SS.00 format translated from spacecraft time and packet subseconds (in integer seconds) that is transmitted to MESSENGER subsystems by the Integrated Electronics Module. PER SPECTRUM column. 512 1 0 48 2048 IOF_SPECTRUM_DATA 1 48 IEEE754MSBSingle 4 Derived column of reflectance-at-sensor spectra. One row per spectrum. NIR spectrum has up to 256 values (depending on binning and windowing), VIS has up to 512. Reflectance is a unitless parameter. Reflectance from saturated pixels, or binned pixels with one saturated element, are set to 1e32. PER SPECTRUM column. 512 1 0 2096 2048 PHOTOM_IOF_SPECTRUM_DATA 1 2096 IEEE754MSBSingle 4 Derived column of photometrically normalized reflectance-at-sensor spectra. One row per spectrum. NIR spectrum has up to 256 values (depending on binning and windowing), VIS has up to 512. Reflectance is a unitless parameter. Reflectance from saturated pixels, or binned pixels with one saturated element, are set to 1e32. PER SPECTRUM column. 512 1 0 4144 2048 IOF_NOISE_SPECTRUM_DATA 1 4144 IEEE754MSBSingle 4 Derived column of noise/error in reflectance propagated through post-calibration procedure. One row per spectrum. NIR spectrum has up to 256 values (depending on binning and windowing), VIS has up to 512. Unitless. Noise from saturated pixels, or binned pixels with one saturated element, are set to 1e32. PER SPECTRUM column. 512 1 0 6192 2048 PHOTOM_IOF_NOISE_SPECTRUM_DATA 1 6192 IEEE754MSBSingle 4 Derived column of noise/error in photometrically normalized reflectance propagated through post-calibration procedure. One row per spectrum. NIR spectrum has up to 256 values (depending on binning and windowing), VIS has up to 512. Unitless. Noise from saturated pixels, or binned pixels with one saturated element, are set to 1e32. PER SPECTRUM column. SOFTWARE_VERSION 14 8240 IEEE754MSBSingle 4 Indicates version of calibration software used. Increments with reprocessing of DDRs. OBSERVATION column. 512 1 0 8244 2048 CHANNEL_WAVELENGTHS 1 8244 IEEE754MSBSingle 4 Column of wavelengths paired to spectrum data channels. Wavelengths derived from calibration report equation 6.5. See VIRS CDR- DDR SIS. Unit = nanometers. OBSERVATION column. DATA_QUALITY_INDEX 15 10292 ASCII_String 19 19 character index of data quality. Each digit signifies quality factor of measurements. PER SPECTRUM column. Format: ABCD-EFGH-IJKL-MNOP A: Dark Scan Flag, denotes shutter commanded closed for dark observation. 0 = shutter not engaged 1 = shutter engaged B: Temperature 1 Flag 0 = Temperature does not exceed 15 deg C threshold. 1 = Temperature exceeds 15 deg C threshold but less than 25 deg C threshold. 2 = Temperature exceeds 25 deg C threshold but less than 40 deg C threshold. 3 = Temperature exceeds 40 deg C threshold. C: Temperature 2 Flag 0 = Temperature does not exceed 15 deg C threshold. 1 = Temperature exceeds 15 deg C threshold but less than 25 deg C threshold. 2 = Temperature exceeds 25 deg C threshold but less than 40 deg C threshold. 3 = Temperature exceeds 40 deg C threshold. D: Grating Temperature Flag 0 = Temperature does not exceed 15 deg C threshold. 1 = Temperature exceeds 15 deg C threshold but less than 25 deg C threshold. 2 = Temperature exceeds 25 deg C threshold but less than 40 deg C threshold. 3 = Temperature exceeds 40 deg C threshold. E: Anomalous Pixels Integer 0-9 = Indicates number of hot pixels found. Working Definition: The number of pixels with a noise spike (defined in DQI L, below). Procedure: The number of noise spike channels for spectra i. Repeat for all N spectra. F: Partial Data Flag 0 = No partial data. 1 = Partial data exists. Working Definition: If any spectrum has nulls in the beginning or end, signifying data drop outs. Procedure: Given spectra i, evaluate first 10 channels and last 10 channels. If any channel has 0 value, set Partial Data Flag = 1. G: Saturation Flag 0 = No pixels saturated. 1 = Saturated pixels exist. H: Low Signal Level Flag 0 = Signal level not below -32768 threshold. 1 = Signal level below -32768 threshold. I: Low VIS Wavelength Uncertainty Flag (not yet implemented, set to 0) 0 = Uncertainty not above TBD threshold at low wavelengths. 1 = Uncertainty above TBD threshold at low wavelengths. J: High VIS Wavelength Uncertainty Flag (not yet implemented, set to 0) 0 = Uncertainty not above TBD threshold at high wavelengths. 1 = Uncertainty above TBD threshold at high wavelengths. K: UVVS Operating Flag 0 = UVVS is not scanning during readout. 1 = UVVS is scanning during readout. L: UVVS Noise Spike Flag 0 = No noise spike detected. 1 = Noise spike detected. Using VIRS VIS (512 channel spectrum, N spectra per CDR) as an example, Working Definition: A noise spike is a data value in 1 or 2 channels that exceeds 3 standard deviations of the average for a given channel in a given observation. Procedure: Calculate the standard deviation for channel 1 through all 1-N spectra. If spectra i has stdev >=3, then spectra i has a noise spike. Repeat calculation for channels 2-512. Keep track of the number of oise spike channels\\ per spectra. M: SPICE Version Epoch. Indicates what SPICE is used to determine pointing fields in CDR. \\Predict\\ SPICE may change one or more times before settling on \\Final\\ pointing solutions about 2 weeks from data acquisition. 0 = No SPICE 1 = Predict 2 = Actual N: Dark Saturation Flag Denotes that there are minimal unsaturated dark frames available for the polynomial fit of one or more pixels. 0 = All pixels in data record contain at least four unsaturated dark frames. 1 = One or more pixels in data record contain three or fewer unsaturated dark frames. O-P: Spares 5 1 0 10311 40 TARGET_LATITUDE_SET 1 10311 IEEE754MSBDouble 8 Derived latitude of footprint center, uprange edge (c1), downrange edge (c2), port, (c3) and starboard (c4) edges (5 total values, coordinates as in Figure 4 of VIRS_CDR_DDR_DAP_SIS.PDF; center point, c1, c2, c3, c4) on planet target corresponding to spectral observation. Unit = degrees. PER SPECTRUM column. 5 1 0 10351 40 TARGET_LONGITUDE_SET 1 10351 IEEE754MSBDouble 8 Derived longitude of footprint center, uprange edge (c1), downrange edge (c2), port, (c3) and starboard (c4) edges (5 total values, coordinates as in Figure 4 of VIRS_CDR_DDR_DAP_SIS.PDF; center point, c1, c2, c3, c4) on planet target corresponding to spectral observation. Unit = degrees. PER SPECTRUM column. ALONG_TRACK_FOOTPRINT_SIZE 16 10391 IEEE754MSBDouble 8 Derived length of VIRS footprint along track over the spectrum integration time, accounting for smear across surface. Unit = meters. PER SPECTRUM column. ACROSS_TRACK_FOOTPRINT_SIZE 17 10399 IEEE754MSBDouble 8 Derived instantaneous width of VIRS footprint across track at the spectrum integration midpoint, accounting for jitter across surface. Unit = meters. PER SPECTRUM column. INCIDENCE_ANGLE 18 10407 IEEE754MSBDouble 8 Derived solar incidence angle of footprint center. Unit = degrees. PER SPECTRUM column. EMISSION_ANGLE 19 10415 IEEE754MSBDouble 8 Derived emission angle of footprint center. Unit = degrees. PER SPECTRUM column. PHASE_ANGLE 20 10423 IEEE754MSBDouble 8 SOLAR_DISTANCE 21 10431 IEEE754MSBDouble 8 Derived subsolar distance to footprint center on planet surface. Unit = kilometers. PER SPECTRUM column. SPARE_1 22 10439 IEEE754MSBSingle 4 SPARE column. SPARE_2 23 10443 SignedMSB4 4 SPARE column. SPARE_3 24 10447 SignedMSB4 4 SPARE column. SPARE_4 25 10451 SignedMSB4 4 SPARE column. SPARE_5 26 10455 SignedMSB4 4 SPARE column. virsvd_ob4_14350_084151.lbl virsvd_ob4_14350_084151_pds3file 2403 virsvd_ob4_14350_084151_pds3file_stream 0 2811 7-Bit ASCII Text Carriage-Return Line-Feed