PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = "2013-05-20" RECORD_TYPE = STREAM OBJECT = DATA_SET DATA_SET_ID = "MSL-M-MARDI-2-EDR-IMG-V1.0" OBJECT = DATA_SET_MISSION MISSION_NAME = "MARS SCIENCE LABORATORY" END_OBJECT = DATA_SET_MISSION OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = "MSL MARS DESCENT IMAGER 2 EDR IMAGE V1.0" DATA_SET_TERSE_DESC = "MSL MARS MARDI ORIGINAL COMPRESSED IMAGE DATA" DATA_SET_COLLECTION_MEMBER_FLG = N DATA_OBJECT_TYPE = IMAGE START_TIME = 2012-03-12T20:51:40.459 STOP_TIME = 2017-03-24T15:43:27.560 DATA_SET_RELEASE_DATE = 2013-05-20 PRODUCER_FULL_NAME = "MICHAEL C. MALIN" DETAILED_CATALOG_FLAG = N CITATION_DESC = "Malin, Michael, MSL Mars Descent Imager Camera EDR V1.0, NASA Planetary Data System, MSL-M-MARDI-2-EDR-IMG-V1.0, 2013." ABSTRACT_DESC = "NULL" DATA_SET_DESC = " Data Set Overview ================= This data set contains products acquired by the MARDI instrument. This data set uses the Committee on Data Management and Computation (CODMAC) data level numbering system. The MSL MARDI EDRs are considered Level 2 or Edited Data (equivalent to NASA Level 0). The EDRs are reconstructed from Level 1 or Raw Data. Processing ========== After receipt on Earth, processing at JPL begins with the reconstruction of packetized telemetry data (raw telemetry packet SFDU's with CFDP headers) into depacketized binary data products and associated Earth metadata files. MMMEDRGEN combines the Earth metadata with additional data extracted from the binary data files to create an EDR with the corresponding label. (SFDU - Standard Formatted Data Unit; CCSDS - Consultative Committee for Space Data Systems; CFDP - CCSDS File Delivery Protocol) Data ==== The EDRs produced contain raw, uncalibrated data and have detached PDS-compliant labels. The Mast Camera (Mastcam), Mars Hand Lens Imager (MAHLI), and Mars Descent Imager (MARDI) Experiment Data Record (EDR) and Reduced Data Record (RDR) PDS Data Products Software Interface Specification contains a detailed description of the EDR formatted products. There are 9 image data types (6 images, 3 thumbnails) that can be wrapped into the original data format that is transferred from the cameras. Some of these are compressed in a format which can reproduce an image identical to the original image on the instrument (lossless compression), some are transferred in lossy format, some are full-scale and others sub-sampled (the only sub-sampled is by a factor of 8, used to produce thumbnail images). The EDR data file includes the camera mini-header generated by the camera, followed by original image data as formatted by the camera. Not including sub-framing, MARDI can take a variety of image data formats and accomplish this by internal processing. The cameras always acquire raw 12-bit data. Normally, the 12-bit raw data are converted from 12-to-8-bits through the use of a variety of companding (compress/expand) lookup tables, the most generally used being a modified square-root encoding scheme that allocates additional values to low DNs. These companded, 8-bit images can then be processed either immediately, and stored into each camera's 8-Gbyte buffer, or they can be stored unprocessed in the buffer, and then later processed in response to downlink commands. It is this flexibility that leads to the complexities of the raw data format and its description. In addition to the 12-to-8-bit companding, on-board processing includes the following capabilities: Bayer pattern interpolation, lossless compression, and JPEG compression. Except for thumbnails, the cameras do not support sub-sampling or resampling, but do support sub-framing. Thumbnails are produced by creating a scratch JPEG image, and extracting the lowest order coefficients of the discrete cosine transform 8x8 pixel compression block, or minimum compression unit (MCU), which is essentially the average of the 8x8 spatial domain MCU. These coefficients are then assembled into a smaller image which is then JPEG compressed. The extraction of these coefficients is the only way MARDI images are ever sub-sampled. The following is a table of the different image product types generated by MARDI which are contained within the raw camera data record. Type Product Format Pixel bits ----------------------------------------------------- A Image Raster 16 B Image Raster 8 C Image Lossless 8 D Image JPEG gray 8 E Image JPEG 422 24 F Image JPEG 444 24 G Thumbnail Raster 8 H Thumbnail JPEG gray 8 I Thumbnail JPEG 444 24 Refer to the Mast Camera (Mastcam), Mars Hand Lens Imager (MAHLI), and Mars Descent Imager (MARDI) Experiment Data Record (EDR) and Reduced Data Record (RDR) PDS Data Products Software Interface Specification for further details on the MARDI data products. " CONFIDENCE_LEVEL_NOTE = "NULL" END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_TARGET TARGET_NAME = MARS END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = MSL INSTRUMENT_ID = MARDI END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "JPLD-75410" END_OBJECT = DATA_SET_REFERENCE_INFORMATION END_OBJECT = DATA_SET END