5:15 PM - 7:15 PM
[STT40-P01] InSAR analysis by using ALOS-4 data
Keywords:ALOS-4, InSAR, crustal deformation
The Advanced Land Observing Satellite-4 (ALOS-4) was launched by the Japan Aerospace Exploration Agency (JAXA) on July 1, 2024. Compared with the Advanced Land Observing Satellite-2 (ALOS-2), ALOS-4 has four times the observation swath and five times the observation frequency. ALOS-4 is expected to improve the accuracy and temporal resolution of the regular analysis conducted by the Geospatial Information Authority of Japan (GSI), which has been monitoring crustal deformation in nationwide and volcanic areas using ALOS-2.
GSI has been validating ALOS-4 data in cooperation with JAXA from the initial calibration and validation phase in order to conduct the regular analysis using ALOS-4 data. Using ALOS-4 stripmap 3 m data, we have successfully generated interferograms between ALOS-2 and ALOS-4, and between ALOS-4 and ALOS-4 (200 km swath). Additionally, ALOS-4 detected crustal deformation associated with volcanic activity around Iwate Volcano, where crustal deformation was detected by ALOS-2. This is the first detection of crustal deformation using ALOS-4. Furthermore, we confirmed that ALOS-4 is effective in detecting crustal deformations in volcanic and land subsidence areas, where crustal deformations were previously detected by ALOS-2.
We will report validation results of ALOS-4 stripmap 3 m data and other modes such as the spotlight and ScanSAR. The progress of the regular analysis using ALOS-4 data will also be presented.
Acknowledgments: ALOS-4 and ALOS-2 data were provided based on the joint research agreement with JAXA and under a cooperative research contract between GSI and JAXA. The ownership of ALOS-4 and ALOS-2 data belongs to JAXA. The numerical weather model was provided from JMA based on the agreement.
GSI has been validating ALOS-4 data in cooperation with JAXA from the initial calibration and validation phase in order to conduct the regular analysis using ALOS-4 data. Using ALOS-4 stripmap 3 m data, we have successfully generated interferograms between ALOS-2 and ALOS-4, and between ALOS-4 and ALOS-4 (200 km swath). Additionally, ALOS-4 detected crustal deformation associated with volcanic activity around Iwate Volcano, where crustal deformation was detected by ALOS-2. This is the first detection of crustal deformation using ALOS-4. Furthermore, we confirmed that ALOS-4 is effective in detecting crustal deformations in volcanic and land subsidence areas, where crustal deformations were previously detected by ALOS-2.
We will report validation results of ALOS-4 stripmap 3 m data and other modes such as the spotlight and ScanSAR. The progress of the regular analysis using ALOS-4 data will also be presented.
Acknowledgments: ALOS-4 and ALOS-2 data were provided based on the joint research agreement with JAXA and under a cooperative research contract between GSI and JAXA. The ownership of ALOS-4 and ALOS-2 data belongs to JAXA. The numerical weather model was provided from JMA based on the agreement.