PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM LABEL_REVISION_NOTE = " 2016-06-15 SwRI:BTCarcich New file " OBJECT = TEXT PUBLICATION_DATE = 2016-06-15 NOTE = "The NH MVIC pluto cruise Raw VERSION 1.0 Data Archive Processing levels description " END_OBJECT = TEXT END Processing Level ================ This data set contains Raw data, one of the two levels (Raw and Calibrated) of pipeline-processed data provided by the NH project to PDS. Refer to DOCUMENT/CODMAC_LEVEL_DEFINITIONS.PDF for a complete description. A brief discussion of processing levels follows: Processing Description Level => CODMAC Level ========== =============== Raw Instrument telemetry formatted for scientific use => CODMAC Level 2 Calibrated Raw data converted to scientific units => CODMAC Level 3 N.B.: Raw and Calibrated data are sometimes referred to as EDR (Engineering Data Records) and RDR (Reduced Data Records), respectively. Raw data are in instrument units, typically binary integers referred to as COUNTs or DATA NUMBER (DN). The raw data are stored in data files with ancillary information such as observation time timestamps and observational geometry. Calibrated data are in scientific or engineering units, such as radiance (W/(m**2 um sr)) or impact particle mass (GRAMs). The conversion to calibrated data from raw data was performed according to an instrument performance model, which was developed from scientific analysis of ground and in-flight calibrations, and which is documented in files in this data set under the DOCUMENT/ and CALIB/ subdirectories. Refer to DOCUMENT/DOCINFO.TXT and CALIB/CALINFO.TXT for pointers to more information. Most science-oriented users will use the calibrated data, as those data have the observations converted to physical units, and instrument characteristics have been removed such as: - non-linearity of instrument counts w.r.t. measured quantity - inversion of instrument counts w.r.t. measured quantity - flat field (pixel to pixel) response Possible reasons for using the raw data are the following: - investigation of the data calibration process - improvement of the data calibration process due to new data or new approaches or new algorithms becoming available - simplicity or limitations of working with integer data - e.g. writing integer values to common image formats Special note for MVIC Calibrated data sets -------------------------------------------- For MVIC images, the conversions to radiance and irradiance are dependent on the spectrum of the target because of the varying spectral response of the instrument detector. So the image data in the calibrated FITS images are stored in units of calibrated DATA NUMBER (DN), which means each raw pixel DN has had instrument artifacts such as bias removed and its value is proportional to the incident energy it received during the observation. Scene-dependent conversion divisors are supplied, in the PDS labels and in the FITS header, to convert from DN/s to radiance and to irradiance. Refer to the MVIC section of the SOC Instrument ICD for more detail.