Data Set Overview :  This data set contains imagery from the near-infrared camera #2 (NIR2) on the LCROSS spacecraft (S/C). NIR2 is a camera sensitive from 0.9 to 1.7 microns.  The images in this dataset have targets named Moon, Earth, Calibration (i.e., not targeted) and TestImage. Test images include ramps and camera initialization images that contain no science content.  Each raw image file is an 8-bit integer greyscale image, with a 720 x 486 pixel format. The image aspect ratio [H:V] is 1.33. The effective field-of-view [FOV] is 28.3 [H] x 21.4 [V] degrees.  The time each image was captured is encoded in the image's filename like this:  LCROSS_NIR2_RAW_.IMG  where  : YYYYMMDDHHMMSSmmm and YYYY : the four digit year; MM : the two digit month, DD : the two digit day, and so on through hours, minutes, seconds and milliseconds.  The detached label for each spectra has the same filename as the spectra but with the 'LBL' extension.  Related Data Sets :  NIR2_CAL (described in NIR2_CAL_DS.CAT) contains the calibrated versions of the images contained in this dataset of raw images. The NIR1_RAW and NIR1_CAL datasets contain images from the other near-infrared camera. NIR1 had almost exactly the same field of view and was slightly less sensitive due to having an added filter.  Parameters :  Science -------  After initialization, the near-infrared cameras were operated by setting two independent parameters:  1. LCROSS:NIR_OPR (an integer [0, 15] inclusive) One of 16 operational configurations stored in non-volatile memory. The factory default settings for these configurations were used.  This setting determines the camera's integration time (in the labels as LCROSS:NIR_INTEGRATION_TIME in microseconds) and gain setting (LCROSS:NIR_GAIN in electrons per DN).  2. LCROSS:ENHANCEMENT_MODE [OFF,ON] Image stretching. Enabled only during the STARFIELD data collection period.  These cameras have additional configuration settings that were redundant or kept constant and so are not noted in the labels. The digital gain setting was always 1. The effect of automatic gain control is to vary the OPR number, which is reported in the labels, so the automatic gain configuration is redundant. In any case, this setting was off except for during the lunar swingby. The Global Offset Value was always 100 except during initialization where it was briefly set to 4095. This parameter isn't noted in the labels, but all images where it was not 100 have a TARGET_NAME of TEST_IMAGE.  Test images include ramps, all states high (white image), and all-states-low (flat dark image) and contain no science content.  Housekeeping ------------  Instrument temperature at the data collection time is reported in the label file under: INSTRUMENT_TEMPERATURE and INSTRUMENT_TEMPERATURE_COUNT in degrees Centigrade and raw counts, respectively. This is a single telemetry point most representative of the instrument chassis temperature.  Processing :  The detector produces 320 x 240, 12-bit grayscale images. Each image was converted inside the camera to an analog, NTSC image and transmitted to the spacecraft. The spacecraft multiplexed the two near-infrared cameras with the visible light 'context' camera, receiving images from only one of these three cameras at a time. When received, the spacecraft converted each NTSC image back to a 720 x 486, 24-bit RGB digital image and compressed it using a lossy, proprietary, wavelet-based compression algorithm for downlink.  On the ground, the images were decompressed and recompressed losslessly as RGB PNG files by GSEOS (Ground Support Equipment Operating System). The LCROSS Make Archive program read these files, selected the Red channel, and wrote that as a single-channel, PDS-formatted image (.IMG) file and a FITS file.  Data :  These files are stored as PDS-formatted, 8 bit MSB_UNSIGNED_INTEGER files.  The EXTRAS directory contains these images in FITS format as well.  Coordinate System :  These images need to be rotated +180 degrees to place them in the LCROSS Payload Common Camera Coordinate System. A description of mapping the images with respect to each other and the S/C coordinate system is contained within the LCROSS Instrument Response and Calibration Report in the CALIB directory of this archive.  Software :  The GSEOS Version used to generate these images is GSEOS 5.2.407 (Feb 25, 2008), Python 2.2.3 (#37, Nov 28, 2003, 04:20:20), Project Version 6.1.064.  The LCROSS.py Python script used with GSEOS is Version Jun 11, 2008.  The LCROSS Report Generator used on GSEOS created CCSDS.dat files is version 114.  The version of Satellite Toolkit used to prepare geometric information for the labels is 8.1.3.  The LCROSS Make Archive program used to assemble the PDS-formatted submission is dated 03/14/2010.

Confidence Level Overview :  The confidence level is unspecified.  Review :  This LCROSS data set was reviewed internally by the LCROSS science team before delivery to PDS. This data set has passed a PDS peer review.  Data Coverage and Quality :  This dataset contains all images taken by LCROSS Near-Infrared Camera #1 (NIR2) during the mission, in raw form. These images are in focus.  The images in this dataset do not have image artifacts caused by compression. Images from the Visible Camera (VIS) did contain compression artifacts (see VIS_RAW_DS.CAT), and the NIR2 camera used the same datapath and compression hardware within the spacecraft. However this problem did not occur with any NIR2 images due to their lower dynamic range when in NTSC format.  Limitations :  These images are not at the native detector resolution and accuracy because they have passed through an analog format before downlink.  Digitizing the analog format on the spacecraft introduced edge pixels that must be clipped before computing image statistics. This clipping is not done in this dataset nor in the calibrated dataset (NIR2_CAL).  Saturated pixels are flagged as out-of-range values in the calibrated versions of these images (in NIR2_CAL), however, the presence of these pixels is not flagged in the raw or calibrated label files.  The detector in this camera blumes significantly when overexposed. This occurred during several data collection periods, including the PREIMPACT, IMPACT and EARTHLOOK periods. Images where this occurred are not flagged in the label files.  Temporarily hot pixels due to cosmic ray strikes are not not flagged.  Rarely, images were lost in decompression on the ground. No significant data was lost this way.  Data Compression :  The raw near-infrared camera images were compressed using a proprietary, wavelet-based compression algorithm onboard and decompressed on the ground. This compression was lossy. A version mismatch between compression / decompression implementations on the spacecraft and the ground resulted in rare failures to decompress an image.