Data Set Overview : This data set contains images acquired by Juno's Stellar Reference  Unit (SRU). This data set uses the Committee on Data Management and Computation (CODMAC) data level numbering system. The SRU EDRs are considered Level 2 or Edited Data (equivalent to NASA Level 0).  Processing : SRU products are produced by the program  make_PDS_labels_SRU_EDR.pl . This program converts the FITS images from the format internally used by the Juno SRU Team. This program reads an SRU image file, strips the FITS headers, extracts information from those headers, creates and formats the PDS labels,  and creates a stripped image file. Data : SRU images are a standard size of 512 by 512 pixels (numbered from 0  through 511, inclusive). The last two rows, rows 510 and 511,  are 'dummy' rows, and the first two columns, columns 0 and 1, are dummy  columns. Thus the first pixel of real data is indexed at (row, column)  0, 2. When the SRU is operated using time delay integration (TDI), the  first row of real data (row 2) experiences an 8.1 ms exposure to the  optical scene (2 RPM spacecraft spin rate; see section 5.1 of the SIS). The SRU (instrument) frame has a boresight coordinate (255.5, 255.5).  Pixel values in the EDRs are in units of output  analog-to-digital data number (DN). Pixel values are represented as  16 bit signed integers  with values from 0 to 16383 (2^14-1), inclusive. The SRU data only  occupies 14 bits, so higher order bits are always zero. Dummy pixels are not read out and their values are replaced with zero.  Any pixel with a zero value is not a valid measurement. Electronic  offsets cause minimum valid values to be on-zero, on the order of 550  or 680 DN, depending on the utilized SRU, 1 or 2 respectively. SRU EDR images are not compressed or processed geometrically and are  archived in the standard Flexible Image Transport System (FITS) format  (http://fits.gsfc.nasa.gov/) (Wells et al., 1981). Each image product  has two parts: the image itself with the extension of 'FIT' and a  detached label with an extension of 'LBL'. Image files include a  standard FITS header that is 2880 bytes long. Files are then padded  with zero fill (ASCII 00h) to be a multiple of 2880 bytes long, as is  standard for FITS files. Partial images are the result of one of two situations: 1.) They may  be commanded purposely in order to satisfy onboard command timing  restrictions, or 2.) Data downlink or data collection problems such as  outages of the Deep Space Network (DSN), spacecraft anomalies, or data  gaps due to weather. In either case, the EDR images are padded with  zeros to always be the same 512x512 pixel size.  Refer to the Stellar Reference Unit Standard Data Products Software  Interface Specification (SIS) for further details on these data products and corrections which can be made for camera optical distortion.

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