Geoscience Reference
In-Depth Information
data are corrected into that of 30, 0, 30
◦
in incident, emission, and phase
angles. There are some studies on photometric collection for Clementine
bands (e.g. see http://www.actgate.com/act/clemcal/alfred.doc written by
A.S. McEwen) but few for panchromatic data like TC data. The phase
angle correction for TC data is in consideration. The TC L2C scene data
will be mosaicked to be two base-maps of eastward and westward lower
solar illumination conditions that will show high-contrast images. These
two maps for the entire Moon will be registered in the L2DB system.
4.3.
DTM production system
We are also developing the TC DTM production system installed in the
SOAC. Input data to this system are also L2A scene data stored in the
L2DB system. The DTM production system performs radiometric calibra-
tion, geometric correction, and destriping prior to stereo-matching. For the
DTM production proceeding, we will use the newest SELENE orbital and
attitude information provided by the JAXA operation team. The error
of orbital information may have an order of km at first. The substantial
improvement of accuracy of SELENE orbit information are planned by the
operation team and SELENE gravitational science team. The attitude infor-
mation will be delivered in an interval of 2 s with accuracy of better than
0.0025
◦
. The designed SELENE attitude control stability is
0
.
003
◦
/s in
3
σ
corresponding to 0.4% of TC IFOV in the TC sampling time. An analy-
sis of SELENE structure response modes has shown that SELENE will be
so stable not to make critical oscillation for TC, less than a few percentage
of IFOV in the TC sampling time. Thus, we expect that the DTM errors
due to spacecraft oscillation will be very small.
Produced DTM scene data set will be registered in the L2DB system
with a quality information data, an ortho-imaging data, a catalog informa-
tion file, and a thumbnail. A set of adjoining DTM scene data also will be
mosaicked to be a map that will be also registered in the L2DB system.
One of the most important pre-launch work is to prepare appropriate DTM
matching parameters. To build an absolute Digital Elevation Model (DEM)
of the Moon with a few 10 m resolution is an ultimate goal of TC global
stereo-mapping.
±
5. Conclusion
The SELENE, scheduled for launch in 2007, will carry the TC onboard. The
goal of the camera is high-resolution stereo mapping for the entire lunar
