Earth observation satellite data processing for EarthCARE/CPR

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25EAR40200

Subject Category: Space Technology

Responsible Representative: Tomomi Nio, Deputy Director for Mission Operations Systems, Space Technology Directorate I, Satellite Applications and Operations Center
Contact Information: SAOC/EarthCARE-MOS(EC-MOS@ml.jaxa.jp)
Members: Kohtaro Araragi, Takanobu Aoki, Yuuichi Asechi, Kazuya Amagai, Yuji Hashibe, Takumi Ishikawa, Hiromichi Kawabe, Kenichi Kajiyama, Gennosuke Kikuchi, Sachiko Kawase, Osamu Motohashi, Hiroshi Mori, Satoshi Takayanagi, Hiroshi Yamato

Abstract

Data from the Earth observation satellite "EarthCARE," launched in May 2024, were reprocessed using improved algorithms.

These data are important because they help interpret clouds and aerosols, which affect the global atmospheric system and climate change. EarthCARE data also contribute to improving the accuracy of climate change predictions by being incorporated into numerical climate models or used to evaluate them.

Reference URL

Please refer to https://www.eorc.jaxa.jp/EARTHCARE/index.html .

Reasons and benefits of using JAXA Supercomputer System

Earth observation data processing includes "operational processing," performed routinely, and "reprocessing," performed every few years for all past data. A reprocessing campaign aligns with periodic algorithm version upgrades. As observation data increase, the reprocessing time for archived data increases. Using supercomputers greatly shortens computation time, enabling products to be delivered to users quickly.

Furthermore, JSS can be used as remote storage to archive master data.

Achievements of the Year

In FY2025, the improved algorithms were installed in JSS to reprocess accumulated data since the start of EarthCARE observations.

In addition, we backed up the data to J-SPACE (311 TB).

The reprocessed data are now being made available to researchers and other users via the data distribution system G-Portal.

Publications

- Poster Presentations

EarthCARE Data System and Product Overview for Data Users, AAS07-P0, JpGU 2025

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: N/A
Number of Processes: 1 - 12
Elapsed Time per Case: 7.2 Second(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.02

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	54942.75	0.06
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	0.00	0.00
/data and /data2	102400.00	0.67
/ssd	0.00	0.00

Archiver Resources
Archiver Name	Storage Used (TiB)	Fraction of Usage*2(%)
J-SPACE	276.03	0.84

*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.