ALOS-2 launch and early orbit operation result

Arikawa, Yasuyoshi; Saruwatari, Hideki; Hatooka, Yasushi; Suzuki, Shuichi

doi:10.1109/igarss.2014.6947212

Cited by 33 publications

(14 citation statements)

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“…occurred in not only Japan but also the World. Figure 1 shows an in-orbit configuration of ALOS-2, and Table 1 summarizes its specifications (Arikawa et al, 2014). ALOS-2 is a synthetic aperture radar (SAR) mission as a successor PALSAR onboard ALOS satellite that operated from 2006 to 2011 (Shimada et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Summary of Natural Disaster Responses by the Advanced Land Observing Satellite-2 (Alos-2)

Tadono¹,

Ohki²,

Abe³

2019

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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<p><strong>Abstract.</strong> The Advanced Land Observing Satellite-2 (ALOS-2) was launched on May 24, 2014, and it is operating very well in space more than 4.5 years. The designed mission life is five years as nominal operational phase and the target is over seven years since launch the satellite. The mission objectives of ALOS-2 are 1) disaster monitoring, 2) national land and infrastructure information, 3) cultivated area monitoring, and 4) global forest monitoring. To achieve the objectives, ALOS-2 carries on the Phased Array type L-band Synthetic Aperture Radar-2 (PALSAR-2), which is an active microwave radar using the 1.2 GHz frequency band and observes in day and night times even in bad weather conditions as successor PALSAR instrument onboard ALOS satellite operated from 2006 to 2011. PALSAR-2 instrument has several enhanced features from PALSAR e.g. finer spatial resolution, spotlight observing mode, dual-polarisation ScanSAR. This paper summarises an introduction of typical data analysis results for monitoring natural disasters by ALOS-2 during the operational phase. As the response natural disasters, more than 400 times of the emergency observations have been conducted to identify damages caused by volcanic activities, earthquakes, flooding etc. happened in Japan and the World.</p>

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Section: Introductionmentioning

confidence: 99%

Summary of Natural Disaster Responses by the Advanced Land Observing Satellite-2 (Alos-2)

Tadono¹,

Ohki²,

Abe³

2019

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…The Phased Array-type L-band Synthetic Aperture Radar-2 (PALSAR-2) aboard ALOS-2 is the latest L-band spaceborne SAR operated by the Japan Aerospace Exploration Agency (JAXA) [10]. ALOS-2 has a worldwide observation scenario for various missions, e.g., deformation detection, forest change monitoring and sea ice monitoring.…”

Section: Introductionmentioning

confidence: 99%

Burst Misalignment Evaluation for ALOS-2 PALSAR-2 ScanSAR-ScanSAR Interferometry

et al. 2017

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This paper reports the validation results of burst misalignment for ScanSAR-ScanSAR interferometry of the Phased Array-type L-band Synthetic Aperture Radar-2 (PALSAR-2) aboard the Advanced Land Observing Satellite-2 (ALOS-2, "DAICHI-2"). After the internal software modification on 8 February 2015, ALOS-2 ScanSAR observation mode archives have been available for use in interferometric analysis, as it was planned. However, it has not been reported whether its burst misalignment satisfies the mission requirements: 90% or higher burst overlap ratio. The validation results in this paper confirm that the expected observation misalignment satisfies the required range, including minimal seasonal and orbital dependencies. The results in this paper are obtained directly from the azimuth offset of the single look complex (SLC) data and are not derived from the orbit records. Nine identical orbits and frame numbers are chosen and evaluated to investigate the average burst misalignment and orbital dependency.

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“…In the case of previous L-band SARs, JERS-1, and ALOS, multi-temporal analyses could distinguish the damaged city blocks in the same manner as the higher-frequency SARs [17][18][19]. The latest L-band SAR satellite ALOS-2 has been observing the Earth since 2014 [20]. The Japan Aerospace Exploration Agency (JAXA) operates ALOS-2 to observe various disasters.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity and Limitation in Damage Detection for Individual Buildings Using InSAR Coherence—A Case Study in 2016 Kumamoto Earthquakes

et al. 2018

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Abstract:In this paper, evaluation results are presented for multi-temporal interferometric coherence analysis using a Synthetic Aperture Radar (SAR) for damage assessment in an urban area. The latest space-borne SARs potentially have a high enough spatial resolution to assess individual buildings. However, interferometric coherence analysis has not been evaluated for its limitation in sensitivity and size of damaged buildings. In particular, the correlation between the coherence analysis and the damage level referred to by architectural assessments has been an open question. In this paper, analytical results using ALOS-2 PALSAR-2 datasets are presented from the 2016 Kumamoto earthquakes in Japan. For reference, building damage was assessed throughout the central urban area and specifically at a catastrophically damaged district. The results show that the buildings should be larger than a window size of the coherence for damage detection, and the damage level should be larger than Level-2 of 5, classified with the European Macroseismic Scale 1998 (EMS-98).

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ALOS-2 launch and early orbit operation result

Cited by 33 publications

References 1 publication

Summary of Natural Disaster Responses by the Advanced Land Observing Satellite-2 (Alos-2)

Summary of Natural Disaster Responses by the Advanced Land Observing Satellite-2 (Alos-2)

Burst Misalignment Evaluation for ALOS-2 PALSAR-2 ScanSAR-ScanSAR Interferometry

Sensitivity and Limitation in Damage Detection for Individual Buildings Using InSAR Coherence—A Case Study in 2016 Kumamoto Earthquakes

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