Data Set Overview
=================

JIRAM Level 1b data products consist of the data produced
by the  instrument reconstructed from the scientific telemetry,
sorted by instrument state and data type, and provided
with spacecraft position, velocity and attitude information.
Any other spacecraft telemetry relevant for calibration and
processing (e.g. temperature of the receiver) is also be included.
JIRAM data consist of two parts: the first contains ancillary data
produced by instrument and used to interpret scientific data, the
second is science data.
The scientific products are spectra or images that are downloaded
form the S/C in data packets or sub-frames.
Packets are then recombined by IOT in image or a number of
spectra as function of the used submode.
Data organized in submodes are not compressed.
Compression on the data is possible to reduce the data volume.
Lossy compression is possible on imager data; the images can be
reduced to JPEG format. The lossy compression reduces the images data
volume of a factor 6.
Lossless compression can be applied to spectra.
The lossless compression would produce a compression of a variable
factor that depends on the datum itself. The factor is about 1.5 on
average.
For each Data Set JIRAM team will deliver a spreadsheet containing
auxiliary information.
In each spreadsheet all products are ordered by acquisition time.
This file will give an overview on the data set acquisition.

Data
====

The 'JUNO MOON JIRAM EXPERIMENT DATA RECORD V1.0' Data Set
contains scientific telemetry generated by the instrument,
edited to remove duplications, zero-padded for missing
packets, and correlated with geometric information needed to locate
observations in space and time. No other kind of processing is
applied to the data.


Coordinate System
=================

Locations on the surface of JIRAM are expressed in planetocentric
coordinates. Longitude is comprised in the range 0 - 360 degrees.


Data Quality
============

Data quality in a data product label is indicated through the
DATA_QUALITY_ID element, and measures the integrity of the telemetry
stream from the instrument. The permitted values of DATA_QUALITY_ID
are the following:

 1: complete data
 0: incomplete data

Confidence Level Overview
  =========================

JIRAM status and capabilities have been tested on October 9, 2013 during
the Juno's Earth flyby when the instrument targeted the Moon
for about half an hour.
Beyond the scientific value of the observation, this has been so far
the first and unique occasion during the cruise phase to verify the execution
of the science observing sequences as they will be operated at Jupiter.
The imager has been able to capture the Moon region straddling
the terminator in L and M astronomic bands.
Some surface features are recognizable and have been mapped with
the support of the geometric information available for JIRAM data.
Spectral pixels acquired in parallel with the M image have been
used to retrieve temperature and spectral emissivity of the sounded region.


  Data Coverage and Quality
  =========================

During the Juno's Earth fly-by, on October 9, 2013, instruments were
switched ON the for their status and responsivities checking.
While the S/C was moving towards the Earth, JIRAM was active,
targeting the Moon, since 13:05 up to 13:50 UTC about.
Throughout this time period the spacecraft moved along its counterclockwise
Sun orbit passing between Earth (on the left) and Moon (on the right).
In the pass geometrical configuration, the Sun was approximately
in the opposite direction of the spacecraft motion versus and the Moon,
at the Juno's closest approach, was divided in two halves by the terminator.
In this configuration JIRAM's telescope swept the body that appeared
as entering in the image plane from the left and crossing
it towards the right side.
132 images both for science and calibrations both in L and M bands
with an equivalent amount of spectral measurements have been
produced in this 45-minutes acquisition.
Among those targeting the Earth's satellite, some of them have been
chosen for a preliminary analysis.
There is not any particular reason in the choice as in the short period
of observations the sounded region at the terminator practically
did not experience variations.

  Data Coverage and Quality
  =========================
    All data in the stated interval are included, to the best of our
    knowledge and attempts to determine completeness.