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Production of the Hapke parameter maps and the multi-band color mosaic of lunar polar regions

JAXA Supercomputer System Annual Report February 2022-January 2023

Report Number: R22EB0101

Subject Category: Space Exploration

PDF available here

  • Responsible Representative: Hiroyuki Sato, Institute of Space and Astronautical Science, Lunar and Planetary Exploration Data Analysis Group
  • Contact Information: JAXA Lunar and Planetary Exploration Data Analysis Group(z-JLPEDA@ml.jaxa.jp)
  • Members: Hiroyuki Sato, Mitsuo Yamamoto

Abstract

Using existing multiband image data, we calculate the Hapke parameter map for the lunar polar region (over 60 degrees in latitude for both north and south poles) and use it to calculate the photometrically normalized color mosaic maps. These data products are necessary to study landing sites and route plannings for JAXA’s up coming lunar polar missions.

Reference URL

Please refer to https://jlpeda.jaxa.jp/index_e.html .

Reasons and benefits of using JAXA Supercomputer System

To process large amounts of planetary remote-sensing data ranging from terabytes to petabytes and to obtain high-resolution results in a relatively short time scale, a parallel computer with a very large number of cores, such as JSS3, is very effective.

Achievements of the Year

A color mosaic map of the north and south polar regions of the Moon was created using data from the Wide Angle Camera (WAC) onboard NASA’s Lunar Reconnaissance Orbiter (LRO) and the Multi-Band Imager onboard JAXA’s lunar explorer SELENE. With the topographic data in higher precision and resolution, improvement of calculation algorithm of the Hapke parameter, and precise removal of shadow regions by ray tracing calculations, we succeeded in creating a product with fewer false colors and higher precision than ever before. Based on the new high-resolution polar maps, space weathering and iron content maps have been produced, contributing to our understanding of the latitudinal dependence of space weathering and crustal growth mechanisms on the Moon.

Publications

– Oral Presentations

Sato H., WAC Polar Product Updates, LROC science team meeting, Oct. 18, 2022.

– Poster Presentations

Sato H., Ohtake M., Latitudinal trend of the lunar south pole, 54th Lunar Planet. Sci. Conf., Abst #1824, 2023.

Usage of JSS

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: Manual parallelization by own script
  • Number of Processes: 12 – 36
  • Elapsed Time per Case: 1 Hour(s)

JSS3 Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.01

 

Details

Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.

Computational Resources
System Name CPU Resources Used
(Core x Hours)
Fraction of Usage*2(%)
TOKI-SORA 0.00 0.00
TOKI-ST 72395.40 0.07
TOKI-GP 0.00 0.00
TOKI-XM 0.00 0.00
TOKI-LM 0.00 0.00
TOKI-TST 0.00 0.00
TOKI-TGP 0.00 0.00
TOKI-TLM 0.00 0.00

 

File System Resources
File System Name Storage Assigned
(GiB)
Fraction of Usage*2(%)
/home 212.37 0.19
/data and /data2 59885.15 0.46
/ssd 30848.33 4.27

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 0.00 0.00

*1: Fraction of Usage in Total Resources: Weighted average of three resource types (Computing, File System, and Archiver).

*2: Fraction of Usage:Percentage of usage relative to each resource used in one year.

 

ISV Software Licenses Used

ISV Software Licenses Resources
ISV Software Licenses Used
(Hours)
Fraction of Usage*2(%)
ISV Software Licenses
(Total)
0.00 0.00

*2: Fraction of Usage:Percentage of usage relative to each resource used in one year.

JAXA Supercomputer System Annual Report February 2022-January 2023