Development and maintenance of AMSR3 research application system

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25EAR90402

Subject Category: Space Technology

Responsible Representative: Osamu Ochiai, Director, Space Technology Directorate I, Earth Observation Research Center
Contact Information: Misako Kachi, JAXA/EORC(kachi.misako@jaxa.jp)
Members: Misako Kachi, Kazuki Nakata, Yuji Taniguchi

Abstract

We develop parameters to be used in resampling process for homogenization of spatial resolution and center position of footprints, which are different to each channel, within Level 1 processing of the Advanced Microwave Scanning Radiometer 3 (AMSR3) to be onboard the Global Observation SATellite for Greenhouse gases and Water cycle (GOSAT-GW).

Reference URL

Please refer to https://www.eorc.jaxa.jp/AMSR/index_en.html .

Reasons and benefits of using JAXA Supercomputer System

Significant reduction of processing time needed to develop parameters by using parallel processes of JSS3. These parameters are constant ones in Level 1 operational processing, but a large number of CPUs is temporarily needed to produce them. Therefore, it takes extremely long time to produce them if we do same calculation in usual computer environment.

Achievements of the Year

In preparation for the public data release of the AMSR3 Level‑1 products, we have limited period for generating the resampling parameters that will be used in the Level‑1R products.

The resampling process that is required for the Level‑1R products takes approximately three hours per an execution under the computational conditions of 6 CPUs and 8 GB memories. This process must be executed independently for 243 points (observation points within a scan) across 30 cases in frequency. If the processes are executed sequentially without the use of JSS3, the total processing time is estimated to be approximately 912 days, which would far exceed the allocated period prior to the public data release scheduled 1-year after the satellite launch.

To address this issue, the processing tasks were executed in parallel using the JSS3 system. By submitting multiple jobs concurrently, all required computations were completed in approximately five days. As a result, all necessary parameters were generated within the release schedule, enabling the timely delivery of the Level‑1 products.

Publications

N/A

Usage of JSS

Computational Information

Process Parallelization Methods: N/A
Thread Parallelization Methods: Automatic Parallelization
Number of Processes: 1
Elapsed Time per Case: 3 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.46

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	4123293.69	4.27
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	100.00	0.00
/ssd	0.00	0.00

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.