ALOS-2 / PALSAR-2 ScanSAR massive data processing

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25EAR10600

Subject Category: Space Technology

PDF (to be added)

Responsible Representative: Kankaku Yukihiro, ALOS-2 mission manager, Space Technology Directorate I
Contact Information: Mikai Hidekazu(mikai.hidekazu2@jaxa.jp)
Members: Takashi Goto, Naoyoshi Hirade, Hidetoshi Hayasaka, Osamu Isoguchi, Koichi Imamura, Fumio Kudoh, Tomoaki Kasuga, Ryosuke Kakuda, Shun Kimura, Hiroshi Mori, Taroh Mutoh, Hidekazu Mikai, Toshimi Nakata, Katsuyuki Otsuka, Yohei Tsujimoto, Tomoo Yamasaki, Hiroshi Yamato, Daiki Yamada, Shinichi Sobue

Abstract

Processing the synthetic aperture radar (PALSAR-2) ScanSAR data onboard on ALOS-2

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

JAXA is developing data distribution system to expand the use of earth observation satellite data.

As part of this, JAXA processes a large amount of data for the all of ALOS-2/PALSAR-2 ScanSAR dat with GIS compatible user friend formart (Analysis ready data) and distribute these ARD data in timely fashion .

To achieve this, JSS3 processing was optimal, so we used it.(Up to 50 parallel processing)

Achievements of the Year

Processing of PALSAR-2 data in JSS3 for the period from March 23, 2025 to January 31, 2026 resulted in:

L1.1: 16,265 scenes

L2.2: 14,719 scenes

Total: 30,984 scenes

In terms of playback IDs, 5,052 processing was performed.

Furthermore, as part of reprocessing of past data:

Processing of 17,511 playback IDs was performed for data from August 4, 2014 to December 31, 2017.

Archived data or data processed this fiscal year are provided to users.

(1) User organizations obtained JSS-IDs and downloaded the data from JSS (user-get)

• Transfer PALSAR-2 ScanSAR L1.1 to NASA-ASF

(2) Transmission via Server (put from JAXA)

- Asia region L2.2 transmission via Chofu transmission relay server to Sakura Internet/Tellus

- Global L2.2 transmission via Chofu transmission relay server to GEE

- Global L2.2 transmission via Chofu transmission relay server to AWS (for a limited period)

- India region L2.2 transmission to Sakura FTP server via Chofu transmission relay server for ISRO

(3) Transmission to G-Portal server via data transmission server during order processing on G-Portal (get by G-Portal user)

(4) ALOS-4/EICS (sub-system) from J-SPACE

- PALSAR-2 L0 data

Publications

N/A

Usage of JSS

Computational Information

Process Parallelization Methods: N/A
Thread Parallelization Methods: OpenMP, pthread, boost::thread
Number of Processes: 1
Elapsed Time per Case: 30 Minute(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.28

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	2412193.59	2.50
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	8870.52	26.98

*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.