PDS_VERSION_ID = PDS3 OBJECT = DATA_SET DATA_SET_ID = OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = "MESSENGER GROUND CALIBRATION MDIS V1.0" DATA_SET_TERSE_DESC = "Image data acquired during the preflight calibration of the Mercury Dual Imaging System (MDIS). Data was were acquired subsequent to environmental testing and in flight configuration." DATA_SET_COLLECTION_MEMBER_FLG = N DATA_OBJECT_TYPE = COLLECTION START_TIME = "N/A" STOP_TIME = "N/A" DATA_SET_RELEASE_DATE = 2005-07-15 PRODUCER_FULL_NAME = "LOUISE PROCKTER" DETAILED_CATALOG_FLAG = N DATA_SET_DESC = " Data Set Overview ================= This dataset contains image data acquired during the preflight calibration of the Mercury Dual Imaging System (MDIS). The experiments were performed with the instrument in flight configuration, and were designed by the JHU/APL team with input from the MESSENGER Science Team. The experiments were conducted under the supervision of Dr. Edward Hawkins of JHU/APL and one or more science team members were present at any given time to assist with the experiments and perform real-time analysis of the data. The main objective of the ground calibration was to obtain data to characterize the performance of MDIS preflight, allowing in-flight experiments to be properly designed and any changes in instrument performance to be monitored over time. MDIS consists of a Wide-Angle Camera (WAC) and a Narrow- Angle Camera (NAC), both of which were tested at a variety of temperatures ranging from room to - 40C, covering the operating range during the MESSENGER mission, and in a vacuum and at ambient pressure. The data includes the following tests: Linearity with exposure and brightness in both NAC and WAC Flat field tests for both WAC and NAC Point Spread Function (PSF) tests, WAC and NAC Dark current tests, WAC and NAC Stray light, both in-field and out-of-field, both WAC and NAC Bandpass characterization, WAC and NAC Details of all these tests can be found in Hawkins et al., (SSR instrument paper, in preparation), and are summarized in the supporting documentation (see MDIS_GROUND_CAL_05_15_05.PDF). Parameters ========== The MDIS data are images in standard FITS format, and may be unbinned or binned. A standard unbinned image is 1024 x 1024 pixels including a 4 column dark strip from columns 0 - 34. Some images have undergone 2x2 binning, so are 512 x 512 pixels and have a dark strip in columns 0-1. Units are in raw data numbers. Processing ========== The MDIS data were processed using analysis software programmed in the Interactive Data Languague (IDL) Data ==== The MDIS ground calibration data were acquired in functional units referred to as RUNs. Each run was given a unique monotonically increasing number and a directory was created for that run, e.g. run139. All files acquired during a given run have filenames in the following format: xxx_YYYYMMDD_NNNNN.fit, where xxx = wac or nac YYYYMMDD = Four-digit year, 2-digit month, 2-digit day of month NNNNN = image number in run .fit = Suffix indicating image is in Flexible Image Transport System (FITS) format. ----------------------------------------------------------------------------- *** MDIS FLIGHT DATA *** The data are in the form of FITS files with attached FITS headers and detached PDS labels. One data file contains one WAC or NAC image. MDIS flight data filenames have the format: 0027882241_IM3_WV_D.IMG. The first numeric field corresponds to the mission elapsed time (MET) corresponding to the commanded start time of the image. The second field (“_IM3WV”) indicates that this is a file of type IMAGE (WAC or NAC) and the number indicates the priority. A “0” corresponds to a critical OpNav, higher numbers correspond to lower priority in downlinking the data to the ground. The “WV” in the field, if present indicates that this image has been processed through the Integer Wavelet Transform (IWT) in the MP computer on the spacecraft. The final field, “D” indicates that the ground processing system has decompressed the wavelet compression. Files that do not have the “_D” suffix, have a 128-byte image header as specified in the MDIS software requirements document, followed by the binary IWT compressed image data. Files which include the “_D” suffix, do NOT have any image header and only contain the raw decompressed (2 bytes per pixel) image data. -------------------------------------------------------------------------------- The ground support computer stored data files in a native image format, called 'IMG'. The raw data numbers were XXX-bit. A XXXX-byte image header was pre- pended to each data array. The 'IMG' data were converted to FITS files to allow real-time analysis of data. Ancillary Data ============== Under each runXXX directory, several ancillary data files document the details and specific circumstances for that run. A “.pro” file exists in each run directory and represents the IDL script used to execute that particular run. The file, “fits_comments.txt,” logs run specific comments that appear in each fits file generated under that run. The XXXXXX directory provides the details of the calibration tests, including the temperature, test type, camera, whether binned or unbinned, OCF configuration, number of frames and test configuration. Further details about the tests can be found in Hawkins et al. (MDIS_CAL_PAPER_V21.PDF). Coordinate System ================= The coordinate system used in for all ground calibration data is MDIS pivot platform coordinates. These observations were made independent of the pivot position. Software ======== N/A Media/Format ============ Electronic " CONFIDENCE_LEVEL_NOTE = " Confidence Level Overview ========================= These data represent the complete ground calibration dataset with MDIS in flight configuration. Review ====== NASA review. Data Coverage and Quality ========================= These data represent the complete ground calibration dataset and are of the expected quality of such data. Limitations =========== None. " END_OBJECT = DATA_SET_INFORMATION /* */ /* The following series of objects provides pointers to other catalog */ /* files in the PDS system which contain detailed descriptions in ODL */ /* similar to this file. */ /* */ OBJECT = DATA_SET_TARGET TARGET_NAME = CALIBRATION END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = MSGR INSTRUMENT_ID = MDIS END_OBJECT = DATA_SET_HOST /* */ /* The DATA_SET_REFERENCE_INFORMATION object is repeated once for each */ /* reference. A separate file with the full DATA_SET_REFERENCE */ /* objects should be provided for all REFERENCE_KEY_ID values not */ /* already in the PDS catalog. */ /* */ OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "N/A" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_MISSION MISSION_NAME = MESSENGER END_OBJECT = DATA_SET_MISSION END_OBJECT = DATA_SET END