PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = "2007-01-02 D. Humm, version 1 based on FFC data modified by S. Murchie and recalculated by S. Pelkey; 2007-05-21 D. Humm v2, based on v1 production-like IR TRDR; 2007-06-29 D. Humm v3, based on v1 IR volcano scan TRDR 2007_158/FFC61C4; 2008-11-17 D. Humm v4, based on images provided by M. F. Morgan; 2009-02-03 D. Humm v5, based on images provided by M. F. Morgan" /* Level 6 CDR (Calibration Data Record) Identification */ DATA_SET_ID = "MRO-M-CRISM-4/6-CDR-V1.0" PRODUCT_ID = "CDR6_4_0891104419_CT_L_8" PRODUCT_TYPE = CDR INSTRUMENT_HOST_NAME = "MARS RECONNAISSANCE ORBITER" SPACECRAFT_ID = MRO INSTRUMENT_NAME = "COMPACT RECONNAISSANCE IMAGING SPECTROMETER FOR MARS" INSTRUMENT_ID = CRISM TARGET_NAME = MARS START_TIME = 2008-03-27T17:00:00 STOP_TIME = 2008-05-22T09:30:00 SPACECRAFT_CLOCK_START_COUNT = "4/0891104419" SPACECRAFT_CLOCK_STOP_COUNT = "4/0895915820" OBSERVATION_TIME = NULL PRODUCT_CREATION_TIME = 2012-04-06T10:40:00.000 OBSERVATION_TYPE = NULL OBSERVATION_ID = NULL MRO:OBSERVATION_NUMBER = NULL MRO:ACTIVITY_ID = NULL MRO:SENSOR_ID = "L" PRODUCT_VERSION_ID = "8" /* CDR Instrument and Observation Parameters */ MRO:WAVELENGTH_FILE_NAME = "CDR6_1_0803692813_SW_L_3.TAB" MRO:DETECTOR_TEMPERATURE = NULL MRO:OPTICAL_BENCH_TEMPERATURE = NULL MRO:SPECTROMETER_HOUSING_TEMP = NULL MRO:SPHERE_TEMPERATURE = NULL SHUTTER_MODE_ID = "OPEN" LIGHT_SOURCE_NAME = "NONE" MRO:CALIBRATION_LAMP_STATUS = "OFF" MRO:CALIBRATION_LAMP_LEVEL = 0 /* This Level 4 CDR label describes one calibration data file. The file */ /* is a mutiple-band, multiple-frame image file derived from flight data. */ /* It consists of a binary image followed by a list of row numbers */ /* corresponding to the wavelength filter. */ /* The AT or atmospheric transmission CDR was calculated by Frank Morgan */ /* of JHU/APL from CRISM observations of Olympus Mons. */ /* This file is used within CAT to estimate the amount of gas */ /* transmission in CRISM data, and remove it as a multiplicative factor. */ SOURCE_PRODUCT_ID = {"FFC0001B815_01_IF254L_TRR3"} /* Atmospheric Transmission from Volcano Scan with artifact spectrum */ /* */ /* This AT CDR is derived from volcano scan observation ID 1B815. */ /* It contains 3 lines. The first line is the atmospheric transmission */ /* spectrum at each binned detector column. Subsequent lines are artifact */ /* spectra for each column; different lines correspond to different pairs */ /* of scaling wavelengths as follows: */ /* Line 2: [2007.0,1980.0], McGuire */ /* Line 3: [2011.0,1899.0], Pelkey */ /* */ /* Atmospheric transmission is derived by dividing spectra from the base */ /* (near 0 km elevation) by spectra from the summit (near 20 km elevation). */ /* It includes a spectral fit-based adjustment to correct an aerosol-like */ /* slope at wavelengths shortward of approximately 2.7 microns. The raw */ /* transmission is fit at wavelengths outside gas absorptions with an */ /* aerosol model with optical depth quadratic in log wavelength, then */ /* divided by that fit. */ /* The detailed sshape of the 2-micron CO2 absorption in CRISM depends on */ /* pressure and temperature. The volcano scan derived transmision, */ /* combining high and low elevation spectra, differs in detail from the */ /* observed spectra being corrected. Atmospheric correction usually leaves */ /* a broad bowl-shaped depression around 2 microns as a result of the */ /* mismatch between scene and transmission spectra. A first order artifact */ /* correction can be applied by adding a multiple of an artifact spectrum */ /* from this CDR to the spectrum after initial correction. The artifact */ /* spectrum included in this CDR is derived by correcting spectra from the */ /* volcano scan base with the tranmsmission derived from the same volcano */ /* scan - essentially, correcting the volcano scan with itself. A linear */ /* interpolation between two wavelengths bracketing the 2-micron region */ /* is assumed to define the correct continuum, and the difference between */ /* continuum estimate and the actual correction is the artifact spectrum. */ /* For these artifact spectra, the interpolation wavelengths were: */ /* 1764.0,2239.0 nm */ /* Use the artifact spectrum matching the scaling wavelengths used for */ /* initial correction. */ /* */ /* This AT CDR applies to a period starting: */ /* SCLK = 891104419 */ /* UTC = 2008-03-27T17:00 */ /* EVENT: Midpoint of decon period */ /* And ending: */ /* SCLK = 895915820 */ /* UTC = 2008-05-22T09:30 */ /* EVENT: Midpoint of decon period */ /* Each value of the atmospheric transmission in the CT level 4 CDR */ /* is the *median*, not the mean, of columns 270-369 in a single row of */ /* the AT level 4 CDR. */ OBJECT = FILE ^TABLE = "CDR6_4_0891104419_CT_L_8.TAB" RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 14 FILE_RECORDS = 480 OBJECT = TABLE NAME = "CENTER OF FIELD ATMOS TRANS TABLE" INTERCHANGE_FORMAT = "ASCII" ROWS = 480 COLUMNS = 2 ROW_BYTES = 14 DESCRIPTION = "center of field atmos trans table" OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = ROWNUM DATA_TYPE = ASCII_INTEGER START_BYTE = 1 BYTES = 3 DESCRIPTION = "detector row number (0-479)" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = SAMPL_WAV DATA_TYPE = ASCII_REAL START_BYTE = 5 BYTES = 8 DESCRIPTION = "center of field atmospheric transmission" END_OBJECT = COLUMN END_OBJECT = TABLE END_OBJECT = FILE END