| DATA_SET_DESCRIPTION |
Data Set Overview
=================
This data set contains uncalibrated, unprocessed, raw near-IR spectral
image cubes acquired during November 2008 through August 2009 by the Moon
Mineralogy Mapper (M3) instrument during the Chandrayaan-1 mission to
the Moon. The data were acquired while the instrument was operated in
global or targeted mode. The documentation in the DOCUMENT directory
provides detailed information about the data files and their format
and content.
Processing
==========
The M3 Data Product SIS document located in the DOCUMENT directory
describes how the data products in this data set were processed.
Data
====
The raw near-IR data are stored as three-dimensional,
band-interleaved image cubes in the DATA directory of this data set.
The file naming convention is described in the M3 Data Product SIS
located in the DOCUMENT directory. Each data file is accompanied
by a detached PDS label file (*.LBL) which describe the content and
format.
Parameters
==========
The M3 Archive Volume SIS and the M3 Data Product SIS documents
located in the DOCUMENT directory provide detailed descriptions
of each file contained in this data set.
Ancillary Data
==============
M3 calibration data such as wavelength centers,
full-width half-max values and radiometric gain factors can be found in
the CALIB directory of the archive volume.
SPICE kernels used to calculate geometric parameters for these data
are located in the GEOMETRY directory.
Coordinate System
=================
Raw data products are not dependent on definition of a coordinate
system.
Software
========
Software is not included with this data set. However each spectral
image cube is accompanied an ASCII text header file compatible with
the commercial software package known as ENVI. Note that L0 data is
not compatible with PDS' NASAView software package.
Media/Format
============
These products are delivered on a hard-drive or by ftp and
are not formatted for a specific medium.
|
| CONFIDENCE_LEVEL_NOTE |
Confidence Level Overview
=========================
Confidence level information will be provided after more thorough
analysis of the data.
Review
======
Prior to creation of the final version of this archival data set,
its keys elements including samples of data products, PDS labels
and catalog files, and the Software Interface Specifications, were
examined during a peer review held by PDS Imaging Node in January 2010.
Data Coverage and Quality
=========================
The M3 image acquisition time will be divided into peak periods or
Optical Periods (OP) when lighting is optimal for observation. The
Optical Periods occur twice a year and are understood to have two
central months of optimal illumination (solar beta angles -30 deg to
+30 deg) with two optional two-week wing periods (solar beta angles
+/-30 deg to +/-45 deg) on either side of the optimal 2 months (thus,
one Optical Period equals 13 weeks). Each 13 week optical period is
followed by a 13-week hiatus. The original instrument operations plan
included the acquisition of the entire surface of the Moon in
low-resolution Global Mode during the first Optical Period (OP1)
while OP2, OP3, OP4 were reserved for high resolution Target Mode
data acquisition.
However, the mission was cut short, just before the halfway point, in
August, 2009 when the spacecraft ceased operations. Despite the
abbreviated mission and numerous technical and scientific challenges
during the flight, M3 was able to cover more than 95% of the Moon in
Global Mode. Only minimal high-resolution Target Mode images were
acquired, as these were to be the focus of the second half of the
mission. The technical challenges encountered during the mission
have complicated the data processing and calibration. These challenges
include thermal issues, loss of the spacecraft star trackers and a
raising of the orbit from 100 km to 200 km on May 19, 2009. Details
of these challenges are currently being documented and will be
referenced and/or included in the delivery of the M3 PDS Archive
Volume. Nonetheless, the data products released in the M3 PDS Archive
Volume will contain optimal calibration and characterization.
M3 operations were sustained for two Optical Periods. (For more
detailed information regarding the spacecraft operation schedule,
please see the MISSION.CAT.) Please see the M3 Data Product SIS for
more detail/information.
Limitations
===========
None.
|
| CITATION_DESCRIPTION |
Green, R., S. Lundeen, and J. Boardman,
CH1-ORB MOON M3 RAW NEAR-IR SPECTRAL IMAGES V1.0,
CH1-ORB-L-M3-2-L0-RAW-V1.0,
NASA Planetary Data System,
2010.
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