Data Set Information
DATA_SET_NAME MSL MARS ROVER ENVIRONMENTAL MONITORING STATION 2 EDR V1.0
DATA_SET_ID MSL-M-REMS-2-EDR-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : The REMS instrument is a meteorological package designed to provide measurements of air and ground temperatures, wind speed and direction, pressure, humidity and ultraviolet radiation. This data set contains the raw unprocessed data stored in the REMS internal memory, as received from telemetry and formatted according to the REMS EDR SIS. It consists of a collection of tables that include the sensors readings as well as engineering data and instrument configurations parameters. The information included in this data set needs to be combined using calibration and other ancillary information to get the physical magnitudes. The required ancillary information can be found in the RDR archive volumes. Each data product in this data set contains one sol of activity time, in a time ordered fashion and taken at maximum resolution of one second. This data set should be useful for anyone interested in knowing the actual sensors electrical readings and status before any processing is applied. The actual environmental magnitudes can be found in the REMS RDRs. Parameters : Raw data consists of measurements from all REMS sensors which have been digitized from electrical data, such as voltages and resistances, to digital numbers or counts using a resolution of 12 bits. Engineering data and instrument configuration parameters are also included because some of them are required for data processing, although their primary function is monitoring and health assessment. Data as stored in the REMS internal memory is a time ordered mixed sequence of entries of the following data types: Sensor Acquisition Engineering Humidity Sensor Regeneration Acquisition Humidity Sensor Regeneration Report Humidity Sensor Defrost Acquisition Humidity Sensor Defrost Report Ground Temperature Sensor Calibration Reset Sleep Event Entry Ground Temperature Sensor Gain Management Error Sensors data are included in the Sensor Acquisition entries. Engineering entries contains some of their configuration modes. Additional instrument configuration parameters are stored in a separated area called the System Parameters. Detailed specification of the data contained in each type and in the System Parameters can be found in the REMS EDR SIS. Sampling is taken at 1Hz maximum, for a baseline operation of 5 minutes every hour. Additional measurements can be taken on an on-demand basis beyond those hourly observations. These additional measurements can also be triggered automatically if event mode is active, in which case the REMS computer will decide whether to continue operating after the 5 minutes session by comparing the measurements taken and the expected trend. The objective is to capture any ongoing transitory atmospheric event. During the first 72 sols, for each 5 minutes block, the wind sensor is set off for the first minute and the last 5 seconds, because it was believed it was causing noise to the rest of the sensors. After sol 73, the wind sensor is always on each time REMS is taking measurements. From sol 793 onwards, a new measurement strategy for Humidity Sensor was introduced. It is called HS HRIM (Humidity Sensor High Resolution Interval Mode) and is only used on selected one-hour long observations. This new strategy intends to minimize heating of the Humidity Sensor, and consists of alternately switching on and off the sensor at periodic intervals. At the same time, Boom 2 is switched off, which means that there are no Wind Sensor and Air Temperature Sensor measurements. Processing : The REMS EDR data products will be generated by the MIPL (Multimission Image Processing Laboratory) at JPL, under the OPGS, using the telemetry processing software called MSLEdrGen. This software will convert the binary data received from telemetry to ASCII and will generate a separate table for each of the data types mentioned above. This means that there will be a table for Sensor Acquisition entries, another for Engineering entries, and so on. Entries will be kept in time order. System Parameters tables will be generated from data provided by the REMS team. In nominal operation mode, they don't need to be downloaded from the instrument, since they are set from earth by means of Spacecraft Commands and therefore their values are known. Only on special situations data may be obtained directly from the instrument. Meta-data acquired from the telemetry data headers will be used to populate the PDS labels. If telemetry packets are missing during the initial downlink from the rover memory, partial data sets will be created. The data will be reprocessed after all data are received and a new version of the EDR (with a new version number) will be created. With the exception of NAIF provided ancillary data, all meta data stored in the label is acquired from the telemetry data stream. Data : REMS EDRs included in this data set are a series of ASCII tables converted from the instrument's internal memory and accompanied with detached PDS labels. This makes it easy to load them in a spreadsheet program or in a database. There is a table for each of the data types entries stored in the REMS memory. As for the System Parameters, instead of having one big table containing all of them, they are broken down into several tables for easier usage. The tables for their corresponding REMS data types are: ACQ Sensor acquisition ENG Engineering ERROR Error EVENT Event Entry GTS_CAL GT sensor calibration GTS_GAIN GT sensor gain management HS_DEF_ACQ Humidity sensor defrost acquisition HS_DEF_REPORT Humidity sensor defrost report HS_REG_ACQ Humidity sensor regen acq HS_REG_REPORT Humidity sensor regen report RESET Reset SLEEP Sleep The System Parameters tables are: SP_ASICS ASIC configuration SP_EVENTS Event mode configuration SP_GTS Ground temperature sensor configuration SP_HS_DEF_REG Humidity Sensor defrost configuration SP_HS_PS Humidity and Pressure sensors configuration SP_MIS Miscellaneous configuration SP_WS Wind sensor configuration Each table contains one sol of activity time and data is time ordered, with a timestamp reflecting the beginning of each each data acquisition. System Parameters are stored for each of the acquisition sessions, since their status is necessary to process acquisition data. One data product is created for each table, with the exception of Humidity Sensor regeneration acquisition and report one side, which are on the same data product, and Humidity Sensor Defrost Acquistion and Report on the other side, which are also on the same data product. Ancillary Data : Ancillary data required to process EDRs and subsequent RDRs to get environmental magnitudes are: Laboratory calibration data Solar azimuth an elevation Rover azimuth, elevation, altitude, pitch, yaw and roll Rover speed Masthead azimuth and elevation Temperature closest to power supply Deck temperature Front-right side temperature UV sensor dust attenuation Although some of these data can be obtained from external sources, all of them are included in the RDR archive volumes, either as RDRs or as separate files. Software : No software is provided in this data set. The EDR tables are simple ASCII files that can be displayed on UNIX, Macintosh, and PC platforms with common software.
DATA_SET_RELEASE_DATE 2015-07-31T00:00:00.000Z
START_TIME 2012-08-07T04:01:16.534Z
STOP_TIME 2015-03-27T02:38:56.480Z
MISSION_NAME MARS SCIENCE LABORATORY
MISSION_START_DATE 2003-10-01T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME MARS
TARGET_TYPE PLANET
INSTRUMENT_HOST_ID MSL
INSTRUMENT_NAME ROVER ENVIRONMENTAL MONITORING STATION
INSTRUMENT_ID REMS
INSTRUMENT_TYPE METEOROLOGY
NODE_NAME Planetary Atmospheres
ARCHIVE_STATUS LOCALLY_ARCHIVED_ACCUMULATING
CONFIDENCE_LEVEL_NOTE Confidence Level Overview : The data presented in the REMS EDR is intended to be the least processed, most primitive data set released for REMS. Data presented here are an accurate representation of REMS data as received from the rover. Data Coverage and Quality : Data reported are the minimally processed data received from the orbiter during nominal REMS operations. All data received is reformatted into one of the EDR data types. Data are by definition of good quality, as damaged telemetry packets are sequestered upon receipt from the spacecraft. We do not expect to receive many (if any) damaged data packets. Limitations : The major limitation of this data set is that this is level 0, minimally processed data. The data are received from the spacecraft telemetry and ingested into a database. If gaps exist in the telemetry, data are lost.
CITATION_DESCRIPTION Gomez-Elvira, J., Mars Science Laboratory Rover Environmental Monitoring Station EDR Data V1.0, MSL-M-REMS-2-EDR-V1.0, NASA Planetary Data System, 2013.
ABSTRACT_TEXT Raw, unprocessed scientific and housekeeping engineering data taken from the Rover Environmental Monitoring Station (REMS) aboard the Mars Science Laboratory.
PRODUCER_FULL_NAME JOSE A RODRIGUEZ-MANFREDI
SEARCH/ACCESS DATA
  • Atmospheres Mars Archive
  • Atmospheres Online Data Volumes
  • MSL Analysts Notebook
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