Data Set Overview : This data set contains raw Robotic Arm Camera (RAC) operational data.  If 12 to 8 bit scaling was commanded, these images HAVE NOT been  transformed back to 12 bits. These images are only used to assess the  morphology, topography, and geologic context of the lander site and should not be used for quantitative scientific purposes. More information is found in ALEXANDERETAL2008, BOSETAL2007, and KELLERETAL2008. Processing : This documentation uses the Committee on Data Management and Computation  (CODMAC) data level numbering system. The Phoenix Camera Payload EDRs  referred to in this document are considered Level 2 or Edited Data  (equivalent to NASA Level 0). The EDRs are to be reconstructed from  Level 1 or Raw Data, which are the telemetry packets within the project  specific Standard Formatted Data Unit (SFDU) record. They are to be  assembled into complete images, but will not be radiometrically or  geometrically corrected. EDR data products will be generated by MIPL using the telemetry  processing software mertelemproc at JPL. The EDRs produced will be raw  uncalibrated data reconstructed from telemetry packet SFDUs and  formatted according to this SIS. Meta-data acquired from the telemetry  data headers and a meta-data database will be used to populate the PDS  label. Missing packets will be identified and reported for  retransmission to the ground as partial datasets. Prior to  retransmission, the missing EDR data will be filled with zeros. The EDR  data will be reprocessed only after all partial datasets are  retransmitted and received on the ground. In these cases, the original  EDR version will be overwritten. Data : The data packaged in the camera data files will be decoded, decompressed  camera image data in single frame form as an Experiment Data Record  (EDR). The Full Frame form of a standard image data file has the maximum  dimensions of 512 x 256. 1) Full Frame EDR Full Frame EDRs are stored as 16-bit signed integers. If 12-to-8 bit scaling is performed, then pixels are stored in 16-bit format and only the last 8 bits of the 16-bit integer are used. 2) Thumbnail EDR Thumbnail EDRs are stored as 16-bit signed integers or 8-bit unsigned integers. If 12-to-8 bit scaling is performed, then pixels are stored in 16-bit format and only the last 8 bits of the 16- bit integer are used. The Thumbnail EDR is a sized down version of the original acquired image (i.e., camera returned pixel data), and size of the binary EDR image data is variable. However, the original acquired image is not always downlinked. The main purpose of a Thumbnail EDR is to provide an image summary using a very low data volume compared to the original image. 3) Sub-frame EDR Sub-frame EDRs are a subset of rows and columns of the 512 x 256 full frame image. Sub-frame EDRs are stored as 16-bit signed integers. If 12-to-8 bit scaling is performed, then pixels are stored in 16-bit format and only the last 8 bits of the 16-bit integer are used. 4) Downsampled EDR A downsampled EDR is a smaller version of the 512 x 256 full frame or subframed image using the following methods: 1) nearest neighbor pixel averaging, 2) pixel averaging with outlier rejection or 3) computing the median pixel value. Downsampled EDRs are stored as 16-bit signed integers. If 12-to-8 bit scaling is performed, then pixels are stored in 16-bit format and only the last 8 bits of the 16-bit integer are used. 5) Reference Pixels The onboard CCD array has 4 pre-Reference null pixels and 8  pre-Reference dark pixels (12-bits) located at the beginning and 4  post-Reference null pixels (12-bits) located at the end of each  row. The values of these pixels indicate the bias level of the  camera at the time of each observation. The Reference Pixel images  were losslessly compressed for downlink. For complex design reasons,  the last post-Reference pixel is a copy of the next-to-last post-Reference pixel. Following the last post-Reference null pixel,  at the very end of each row, is the camera hardware serial number  (left-shifted by 4 bits if 12-bit data). Software : Phoenix Camera Payload downlink processing software is focused on rapid reduction, calibration, and visualization of images in order to make discoveries, to accurately and expeditiously characterize the geologic  environment around the lander, and to provide timely input for  operational decisions concerning target selection. Key software tools  have been developed at JPL by the MIPL, SSV, and APSS groups, at NASA  Ames, and at the USGS/Flagstaff.  PDS-labeled images and tables can be viewed with the program NASAView,  developed by the PDS and available for a variety of computer platforms  from the PDS web site http://pdsproto.jpl.nasa.gov/Distribution/license.html. There is no charge for NASAView. Media/Format : The data set will initally be delivered and kept online. Upon Mission  completion, the RAC EDRs will be delivered to PDS on DVD.

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