PDS_VERSION_ID = "PDS3" /*** FILE FORMAT ***/ FILE_RECORDS = 2031 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 144 /*** GENERAL DATA DESCRIPTION PARAMETERS ***/ PRODUCT_ID = "MLATRACKADJUSTMENTS" PRODUCT_VERSION_ID = "V1" PRODUCT_CREATION_TIME = 2017-01-26 PRODUCT_TYPE = "RDR" STANDARD_DATA_PRODUCT_ID = "MLA_DATA" INSTRUMENT_HOST_NAME = "MESSENGER" INSTRUMENT_NAME = "MERCURY LASER ALTIMETER" INSTRUMENT_ID = "MLA" DATA_SET_ID = "MESS-E/V/H-MLA-3/4-CDR/RDR-DATA-V2.0" DATA_SET_NAME = "MESSENGER E/V/H MLA 3/4 CDR/RDR DATA V2.0" MISSION_PHASE_NAME = {"MERCURY ORBIT YEAR 4", "MERCURY ORBIT YEAR 5"} TARGET_NAME = "MERCURY" PRODUCER_ID = MESSENGER_MLA_TEAM PRODUCER_INSTITUTION_NAME = "GODDARD SPACE FLIGHT CENTER" START_TIME = 2014-05-26T02:38:29 STOP_TIME = 2015-04-30T11:14:16 SPACECRAFT_CLOCK_START_COUNT = "2/43395908" SPACECRAFT_CLOCK_STOP_COUNT = "2/72716444" DESCRIPTION = " A summary file of the adjustments made to the spacecraft position using navigation orbits and MLA data. This file contains one record corresponding to each plot file contained in the in RDR_PLOTS directory within this volume." ^TABLE = "MLATRACKADJUSTMENTS.TAB" OBJECT = TABLE COLUMNS = 15 INTERCHANGE_FORMAT = ASCII ROW_BYTES = 144 ROWS = 2031 DESCRIPTION = " This table summarizes all adjustments to spacecraft position made using data from the MLA instrument during the low altitude MESSENGER orbits. Each record represents one adjustment to spacecraft position based on an MLA ground track, an existing MLA Digital Elevation Map, and a predicted SPK provided by the navigation team. The record length is currently set to 142 bytes, with an additional 2 bytes for a carriage return/line feed." OBJECT = COLUMN COLUMN_NUMBER = 1 BYTES = 10 START_BYTE = 1 FORMAT = "I10" NAME = CDR_ID DATA_TYPE = LSB_UNSIGNED_INTEGER DESCRIPTION = "The ID of the MLA CDR/RDR that was used to evaluate the spacecraft position relative to an existing MLA digital elevation map." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 BYTES = 6 START_BYTE = 11 DATA_TYPE = ASCII_REAL FORMAT = "F6.1" NAME = NAV_SPK_ID DESCRIPTION = "Identifier of the predictive navigation orbit solution used to geolocate the particular CDR/RDR in column 1." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 BYTES = 9 START_BYTE = 17 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" NAME = PREDICTION_TIME UNIT = 'DAYS' DESCRIPTION = "Prediction time, in days, since the OD data cut-off of the navigation SPK used in this model. Note that a negative values indicates that the orbit is reconstructed." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 BYTES = 11 START_BYTE = 26 DATA_TYPE = ASCII_REAL FORMAT = "F11.4" NAME = ALONG_TRACK_CORRECTION UNIT = 'KM' DESCRIPTION = "Correction applied to the orbit to have MLA data match known MLA topography basemap. The correction has three components; along-track, across-track, and radial. This value is the along-track component of the correction, in km." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 BYTES = 10 START_BYTE = 37 DATA_TYPE = ASCII_REAL FORMAT = "F10.4" NAME = CROSS_TRACK_CORRECTION UNIT = 'KM' DESCRIPTION = "Correction applied to the orbit to have MLA data match known MLA topography basemap. The correction has three components; along-track, across-track, and radial. This value is the cross-track component of the correction, in km." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 BYTES = 10 START_BYTE = 47 DATA_TYPE = ASCII_REAL FORMAT = "F10.4" NAME = RADIAL_CORRECTION UNIT = 'KM' DESCRIPTION = "Correction applied to the orbit to have MLA data match known MLA topography basemap. The correction has three components; along-track, across-track, and radial. This value is the radial component of the correction, in km." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 BYTES = 9 START_BYTE = 57 DATA_TYPE = ASCII_REAL FORMAT = "F9.1" NAME = INITIAL_RMS UNIT = 'M' DESCRIPTION = "Initial altimetric residual RMS in meters. The returns are compared to values derived from an existing MLA topography basemap at the predicted location prior to adjustments being made." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 BYTES = 8 START_BYTE = 66 DATA_TYPE = ASCII_REAL FORMAT = "F8.1" NAME = FINAL_RMS UNIT = 'M' DESCRIPTION = "Final, minimized altimetric residual RMS in meters. The location of the spacecraft is adjusted to minimize the residual between measured values and those derived from an existing MLA topography basemap." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 BYTES = 6 START_BYTE = 74 NAME = NUMBER_DATA_PTS FORMAT = "I6" DATA_TYPE = LSB_UNSIGNED_INTEGER DESCRIPTION = "The number of ground returns measured by the MLA instrument in this CDR/RDR that are used to minimize RMS." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 BYTES = 9 START_BYTE = 80 DATA_TYPE = ASCII_REAL FORMAT = "F9.3" NAME = MIN_ALTITUDE_P2C UNIT = 'KM' DESCRIPTION = "The predicted minimum altitude of the spacecraft above topography as predicted by the navigation orbit prior to correction. This value was valuable to assuring the spacecraft's safety." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 BYTES = 9 START_BYTE = 89 DATA_TYPE = ASCII_REAL FORMAT = "F9.3" NAME = MIN_ORBITAL_RADIUS_P2C UNIT = 'KM' DESCRIPTION = "The predicted minimum orbital radius of the spacecraft in kilometers prior to applying any correction." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 BYTES = 13 START_BYTE = 98 DATA_TYPE = ASCII_REAL FORMAT = "F13.1" NAME = TIME_AT_MIN_RADIUS_PRED UNIT = 'S' DESCRIPTION = "The predicted time at which minimum orbital radius would be encountered by the spacecraft in seconds since J2000." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 13 BYTES = 9 START_BYTE = 111 DATA_TYPE = ASCII_REAL FORMAT = "F9.3" NAME = MIN_ALTITUDE_CORR UNIT = 'KM' DESCRIPTION = "The corrected minimum altitude of the spacecraft above topography as calculated using MLA data and the MLA digital elevation model. This value was valuable to assuring the spacecraft's safety." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 14 BYTES = 9 START_BYTE = 120 DATA_TYPE = ASCII_REAL FORMAT = "F9.3" NAME = MIN_ORBITAL_RADIUS_CORR UNIT = 'KM' DESCRIPTION = "The corrected minimum orbital radius of the spacecraft in kilometers." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 15 BYTES = 13 START_BYTE = 129 DATA_TYPE = ASCII_REAL FORMAT = "F13.1" NAME = TIME_AT_MIN_RADIUS_CORR UNIT = 'S' DESCRIPTION = "The corrected time at which minimum orbital radius would be encountered by the spacecraft in seconds since J2000." END_OBJECT = COLUMN END_OBJECT = TABLE END