|Data Set Abstract
||After the digital data were transmitted to Earth and received at
the Jet Propulsion Laboratory, they were subject to a variety of
processes to produce the final digital tapes and photoproducts.
The first step was to strip out all the non-video data and
produce a System Data Record (SDR). This was compiled into video
format, and an Experiment Data Record (EDR) was produced. The EDR
data consist of unprocessed (raw) instrument data. Substantial
processing is required to reconstruct each image owing to the
unique manner in which data were transmitted to earth. Images
were initially recorded on 7-track magnetic tape recorders on the
spacecraft. Each raw data frame retrieved from the tracking
station thus contains every seventh pixel arranged in either
increasing or decreasing order. Image data reconstructed from
these raw data frames by the Mission Test Imaging System (MTIS)
form the EDR digital archive tape.