PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = "2001-07-20" OBJECT = DATA_SET DATA_SET_ID = "NEAR-A-MSI-3-EDR-EROS/FLY/BY-V1.0" OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = "NEAR MSI IMAGES FOR EROS/FLY/BY" DATA_SET_COLLECTION_MEMBER_FLG = "N" DATA_OBJECT_TYPE = IMAGE START_TIME = 1998-12-23T00:00:00.000 STOP_TIME = 1998-12-23T23:59:59.999 DATA_SET_RELEASE_DATE = 2001-06-25 PRODUCER_FULL_NAME = "Howard W. Taylor" DETAILED_CATALOG_FLAG = "N" DATA_SET_DESC = " Data Set Overview ================= NEAR EDR volume sets contain a single data set, from one instrument and one mission phase (defined in the phase table in /AAREADME.TXT). The first volume of the set is a documentation-only volume and contains CALIB, GEOMETRY and other non-data subdirectories. The INDEX directory on the first volume contains the summary of all the volumes. The DOCUMENT directory on the first volume contains non-changing documentation. Subsequent volumes contain only BROWSE, CATALOG, DATA, and INDEX subdirectories in order to minimize duplication. The data volumes also contain a DOCUMENT directory, which contains information related to the calibration of the data files on that volume. Directory/Product Description: ------------------------------ All images and image products described below are 537 x 244 rectangular pixels where the rectangular pixel dimensions are 162 x 96 microradians. RAW: Raw images. Image in this directory are units of raw DN, as received from the spacecraft after data were uncompressed. No editing of the data has taken place. Missing transfer frames are represented as null pixels. RAD: Radiance images. Images in this directory have been calibrated to units of radiance using the following procedure. Dark current was removed using a model based on position in the image, mission-elapsed time, exposure time, and CCD temperature. Frame transfer smear was removed using the procedure described in MSICAL.TXT. The image was then divided by the flat-field image corresponding to the filter through which the image was taken. To convert from these units of 'corrected DN' to radiance, the image was divided by its exposure time, a calibration coefficient (which converts from DNs/time to radiance) for that filter, and the temperature dependence of the calibration coefficient as described in MSICAL.TXT. CRD: Cleaned radiance images. Images in this directory have been calibrated to units of radiance using the following procedure. Dark current, background frame transfer smear, and background leaked light were removed using the nominal image and one taken with a 0-ms exposure within several seconds, through the same filter. The 0-ms exposure has a slightly different dark current but the same frame transfer smear and leaked light. Dark current was removed separately from the two images, using a model based on position in the image, mission-elapsed time, exposure time, and CCD temperature. The dark-corrected 0-ms image was subtracted from the dark-corrected nominal image. The difference image was then divided by the flat- field image corresponding to the filter through which the image was taken. To convert from these units of 'corrected DN' to to radiance, the image was divided by its exposure time, a calibration coefficient (which converts from DNs/time to radiance) for that filter, and the temperature dependence of the calibration coefficient as described in MSICAL.TXT. CRDDBL: Cleaned, deblurred radiance images. Images in this directory have been calibrated to units of radiance beginning with the procedure described for cleaned radiance images (CRD). In addition, images were 'deblurred' by application of a Fourier filtering restoration of a degraded image point-spread function, as described in MSICAL.TXT. IOF: I/F images. Images in this directory have been calibrated to units of I/F beginning with the procedure described for radiance images (RAD). The images were subsequently divided by pi times the solar irradiance expected at the target body's distance from the Sun. IOFDBL: Deblurred I/F images. Images in this directory have been calibrated to units of I/F beginning with the procedure described for I/F images (IOF). In addition, images were 'deblurred' by application of a Fourier filtering resotration of a degreded image point-spread funcition, as described in MSICAL.TXT CIF: Cleaned I/F images. Images in this directory have been calibrated to units of I/F beginning with the procedure described for cleaned radiance images (CRD). The images were subsequently divided by pi times the solar irradiance expected at the target body's distance from the Sun. CIFDBL: Cleaned, deblurred I/F images. Images in this directory have been calibrated to units of radiance beginning with the procedure described for cleaned I/F images (CIF). In addition, images were 'deblurred' by application of a Fourier filtering restoration of a degraded image point-spread function, as described in MSICAL.TXT. ------------------------------------------------------ Parameters ========== The definitions for the image parameters and other keywords are given in the file MSIDEFINITIONS.TXT contained in the DOCUMENT/INSTRUMENT subdirectory. Data ==== The data are in the form of FITS files with attached FITS headers and detached PDS labels. Data files contain one image per file. Ancillary Data ============== Geometry and CALIB subdirectories are described above. Media/Format ============ This data set is released as a CDROM set. Processing History ================== The processing history includes no background, noise, geometry or other corrections." CONFIDENCE_LEVEL_NOTE = " Data Quality Flag ================= Each data file label includes a quality flag string in the data_qualITY_ID keyword, extracted from the FITS keyword near-008 of the original data label. The fields of this keyword are defined below. Data quality defects flag is raised when there is missing data other fields informational and not quality related. The eight characters of this field are described below. Definition - Data Quality Index c0 = Data Quality Flag (0=good,1=flagged for quality defects) c1 = Instrument Number for FC, CTP and AIU (1 or 2) c2 - c6 = Processing Flags not quality related c7 = CCDS Source (0=VC0, 1=VC1, 2=VC2, 3=VC3) Review ====== This data set was currently undergoing external peer review within PDS in July, 2001." END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_TARGET TARGET_NAME = "EROS" END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = "NEAR" INSTRUMENT_ID = "MSI" END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "CHENGETAL1998" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "HAWKINSETAL1997" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "MURCHIE&PIETERS1996" END_OBJECT = DATA_SET_REFERENCE_INFORMATION END_OBJECT = DATA_SET END