Data Set Information
DATA_SET_NAME LRO MOON LAMP 2 EXPERIMENT DATA RECORD V1.0
DATA_SET_ID LRO-L-LAMP-2-EDR-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION DATA SET OVERVIEW : The Lunar Reconnaissance Orbiter (LRO) Lyman Alpha Mapping Project (LAMP) CODMAC Level 2 Experiment Data Record is a collection of the far ultraviolet photon detections obtained by the LAMP instrument, in raw form. As such, it constitutes the permanent record of the raw LAMP data. These data include both the instrument science and housekeeping data, organized into extensions within files formatted according to the Flexible Image Transport System (FITS) standard, version 2.1b. The LAMP EDR archive enables reprocessing of the raw science data as radiometric and geometric calibration processing routines improve. Investigators interested in applying advanced calibration methods or needing to understand the properties of the raw data will find the EDR products useful. Most investigators, however, will be interested in using either the LAMP data products contained in the CODMAC Level 3 Reduced Data Record, as radiometric and geometric calibration processing has already been done for these products, or the LAMP CODMAC Level 5 far ultraviolet map products. PARAMETERS : The fundamental measured parameters contained in the LAMP EDR data set are the nearest time markers and the spatial and spectral locations on the LAMP detector for each of the recorded far ultraviolet photon detection events. From these values raw calculated count rates (counts/sec) integrated over all spatial and spectral bins are also derived. The sampling interval for the derived count rate values is determined by the commanded rate at which the time markers are inserted into the data stream. This value will normally be set to 250 Hz. PROCESSING : LAMP EDR data products will be generated at the LAMP Science Operations Center (SOC), located at the Southwest Research Institute in Boulder, Colorado. The products will be generated by an automated pipeline process. The LAMP instrument will nominally generate one housekeeping telemetry file and one science data file per orbit. Once per day these LAMP-generated files will be retrieved from the LRO spacecraft by the LRO Mission Operations Center (MOC) and then transferred by the MOC to the LAMP SOC. The automated LAMP SOC pipeline will ingest these files and invoke software to process them, in pairwise fashion (one housekeeping and one science data file at a time), into EDR data product files. No calibration of the science data will be done at this time. Raw housekeeping telemetry values will be converted to engineering units, where applicable, and these converted values will be included in the EDR data product files. DATA : The LAMP EDR data product file will contain the following seven types of data: 1) Spectral Image (Aperture Door Open) - This is a reconstructed histogram generated from the pixel list data in the science data file. Using information from the housekeeping data, only the pixel list data acquired when the aperture door was open are included in this dataset. If housekeeping data are unavailable, all pixel list data are included in this histogram. If the science data file contains only data acquired with LAMP operating in histogram mode, this dataset will contain a copy of the first histogram image. This summary image is used as a 'quick-look' check on data quality. [Extension 0, primary FITS header and data unit (HDU)] 2) Spectral Image (Aperture Door Closed) - This is similar to the first dataset above, but the reconstructed histogram here is generated from pixel list data acquired when the aperture door was closed. If housekeeping data are unavailable, this dataset will be empty. If the science data file contains only data acquired in histogram mode, this dataset will contain a copy of the second histogram image in the file. This summary image is used as a 'quick-look' check on data quality. [Extension 1] 3) Acquisition List - This dataset contains a list of the generated frame acquisitions as determined from the housekeeping data file. The list includes, for each frame, the instrument frame sequence number, start and stop times, mode type, aperture door and other instrument state information. The frame acquisition times and instrument state data contained in this list are used to cross-reference with the pixel list mode data for purposes of selecting data and checking timing consistency. [Extension 2] 4) Raw Frame Data - This dataset contains all of the raw data from the science data file except for the file header. [Extension 3] 5) Calculated Count Rate - This dataset contains a high-resolution sequence of UV photon count rates computed from the pixel list data for each acquisition (nominally the whole orbit). The resolution of this count rate sequence depends on the commanded 'hack time' interval. If no consecutive pixel list science data are available, e.g., if data are acquired only in histogram mode, then this dataset will contain the lower resolution (1-Hz) count rate data that are available from the housekeeping data file. [Extension 4] 6) LTS Data - LAMP housekeeping data contain up to 10 values per second of gain and offset corrected measurement values from each of the two LAMP Lunar Terminator Sensors (LTS). This dataset provides the full 10-Hz LTS dataset. These coincident LTS data will be used with the count rate sequence in Extension 4 to confirm that LAMP is viewing the appropriate day/night/shadow scenes. (Raw 14-bit LTS data sampled at the 1-Hz HK rate is included together with this 10-Hz gain and offset corrected LTS dataset in the housekeeping data Extension 6.) [Extension 5] 7) Housekeeping Data - This dataset contains the complete housekeeping dataset, both in raw format and, where applicable, in calibrated engineering units. HK data are included here to assist with joint instrument and data quality trending analyses (foreseen and unforeseen). [Extension 6] ANCILLARY DATA : Ancillary data used in the generation of the LAMP EDR data set include those values required to convert instrumental engineering quantities contained in the housekeeping data from raw values to physical units. These data have been obtained from the LAMP engineers at the Southwest Research Institute in San Antonio, Texas. COORDINATE SYSTEM : The LAMP EDR data product is a CODMAC Level 2 product. As such, the science data contained therein have not been corrected for instrumental effects, calibrated, or located in space. The data are reported according to the two-dimensional detector coordinate system in X and Y (1024 x 32, respectively). SOFTWARE : Because the LAMP EDR data product files adhere to version 2.1b of the FITS standard, all FITS readers up to this standard should be able to successfully read these files. There are many such FITS readers freely available in the public domain. MEDIA/FORMAT : The LAMP EDR data product files are written in FITS format, and the format of each file is described in an accompanying detached PDS label. The EDR archive itself will be written on DVD-R media and physically delivered from the LAMP SOC to the PDS Imaging Node, where it will be made generally available via the World Wide Web.
DATA_SET_RELEASE_DATE 2010-03-15T00:00:00.000Z
START_TIME 2009-01-01T12:00:00.000Z
STOP_TIME N/A (ongoing)
MISSION_NAME LUNAR RECONNAISSANCE ORBITER
MISSION_START_DATE 2009-06-18T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME MOON
TARGET_TYPE SATELLITE
INSTRUMENT_HOST_ID LRO
INSTRUMENT_NAME LYMAN ALPHA MAPPING PROJECT
INSTRUMENT_ID LAMP
INSTRUMENT_TYPE SPECTROGRAPH
NODE_NAME Imaging
ARCHIVE_STATUS LOCALLY_ARCHIVED_ACCUMULATING
CONFIDENCE_LEVEL_NOTE Confidence level information will be provided after more thorough analysis of the data.
CITATION_DESCRIPTION Kaufmann, D.E., LRO L LAMP EXPERIMENT DATA RECORD V1.0, LRO-L-LAMP-2-EDR-V1.0, NASA Planetary Data System, 2009.
ABSTRACT_TEXT The Lunar Reconnaissance Orbiter (LRO) Lyman Alpha Mapping Project (LAMP) CODMAC Level 2 Experiment Data Record is a collection of the far ultraviolet photon detections obtained by the LAMP instrument, in raw form. As such, it constitutes the permanent record of the raw LAMP data. These data include both the instrument science and housekeeping data, organized into extensions within files formatted according to the Flexible Image Transport System (FITS) standard, version 2.1b. The LAMP EDR archive enables reprocessing of the raw science data as radiometric and geometric calibration processing routines improve. Investigators interested in applying advanced calibration methods or needing to understand the properties of the raw data will find the EDR products useful. Most investigators, however, will be interested in using either the LAMP data products contained in the CODMAC Level 3 Reduced Data Record, as radiometric and geometric calibration processing has already been done for these products, or the LAMP CODMAC Level 5 far ultraviolet map products.
PRODUCER_FULL_NAME DAVID E. KAUFMANN
SEARCH/ACCESS DATA
  • Imaging Planetary Image Atlas
  • Imaging Online Data Volumes
  • Lunar Orbital Data Explorer
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