Development and maintenance of AMSR3 research application system
JAXA Supercomputer System Annual Report February 2021-January 2022
Report Number: R21EAR90402
Subject Category: Space Technology
- Responsible Representative: Riko Oki, Director, Earth Observation Research Center, Space Technology Directorate I
- Contact Information: Misako Kachi, JAXA/EORC(kachi.misako@jaxa.jp)
- Members: Hideyuki Fujii, Misako Kachi, 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 'AMSR Series | Advanced Microwave Scanning Radiometer'.
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 AMSR3 Level 1 processing, resampling processing to modify spatial resolution is done to produce Level 1R, Level 1H, and Level 1C products. Resampling processing is to calculate weight of input brightness temperature to change its spatial resolution and observed position to those of output targets by using Backus-Gilbert method.
The Weight is needed to calculate for every combination of spatial resolution of input brightness temperature and output targets. In addition, relationship of observed position in each scan (from start to end position) varies since microwave imager observes the Earth surface with rotating. Therefore, we need to calculate each weight depending on relationship between spatial resolution of input brightness temperature and output target and relationship of observed position. Number of weights need to be calculated will be more than 40,000 for AMSR3 Level 1 processing. Since it takes 8-hour for calculating single weight, we need more than 220-day if we calculate those weights in serial processing. We achieved significant reduction of processing time by using paralell processing in JSS3.
Publications
N/A
Usage of JSS
Computational Information
- Process Parallelization Methods: N/A
- Thread Parallelization Methods: OpenMP
- Number of Processes: 1
- Elapsed Time per Case: 12 Hour(s)
JSS3 Resources Used
Fraction of Usage in Total Resources*1(%): 0.09
Details
Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.
| System Name | CPU Resources Used(Core x Hours) | Fraction of Usage*2(%) |
|---|---|---|
| TOKI-SORA | 0.00 | 0.00 |
| TOKI-ST | 653554.10 | 0.80 |
| 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 Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
|---|---|---|
| /home | 8.33 | 0.01 |
| /data and /data2 | 183.33 | 0.00 |
| /ssd | 116.67 | 0.03 |
| 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 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 2021-January 2022