To measure land subsidence using satellite SAR data, PSInSAR analysis is effective because it can measure displacement with high accuracy, although it is limited to persistent scattering points only. Although PSInSAR analysis requires a large number of data observed under the same conditions to ensure measurement accuracy, it is possible to use Sentinel-1 SAR data, which does not have high spatial resolution but has a relatively high measurement frequency. In this paper, in the eastern Chiba Prefecture area, where the maximum land subsidence is about 2 cm/year, land subsidence was measured by PSInSAR analysis using Sentinel-1 SAR data of descending orbit for seven years from January 2017 to January 2024, and compared with the results of level surveys conducted once a year. The accuracy of displacement measurement by PSInSAR analysis using Sentinel-1 SAR data was about 5 mm, and the accuracy of displacement velocity measurement was about 1 mm/year, even when reference values were set for each relatively wide area.
"},{"@language":"ja","@value":"人工衛星SARデータを活用した地盤沈下量の計測では，恒久的な散乱点のみの限定となるが，精度よく変位を計測できるPSInSAR解析が有効である．本解析で計測精度を確保するためには同一条件で観測した多くのデータが必要であり，時間分解能が比較的高いSentinel-1 SARデータの活用が有効である．本論文では最大で約2cm/年地盤沈下している千葉県東部地域において，2017年1月から2024年1月までの南行軌道のSentinel-1 SARデータを用いてPSInSAR解析を実施して地盤沈下量を計測し，年1回実施されている水準測量結果と比較して計測精度を評価した．その結果，比較的広い領域ごとに基準値を設定しても，変位計測精度は5mm程度，変位速度の計測精度は1mm/年程度であり，水準測量と併用することで，広範囲での沈下量を精度よく把握できることを示した．
"}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410586731664064385","@type":"Researcher","foaf:name":[{"@language":"ja","@value":"安保 秀範"},{"@language":"en","@value":"ABO Hidenori"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"東電設計株式会社 新領域研究開発推進室"}]},{"@id":"https://cir.nii.ac.jp/crid/1410586731664064384","@type":"Researcher","foaf:name":[{"@language":"ja","@value":"大澤 高浩"},{"@language":"en","@value":"OSAWA Takahiro"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"山口大学 大学研究推進機構"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"24366021"}],"prism:publicationName":[{"@language":"ja","@value":"土木学会論文集"},{"@language":"en","@value":"Japanese Journal of JSCE"},{"@language":"ja","@value":"土木学会論文集"},{"@language":"en","@value":"Japanese Journal of JSCE"}],"dc:publisher":[{"@language":"en","@value":"Japan Society of Civil Engineers"},{"@language":"ja","@value":"公益社団法人 土木学会"}],"prism:publicationDate":"2025","prism:volume":"81","prism:number":"8","prism:startingPage":"n/a"},"reviewed":"false","url":[{"@id":"https://www.jstage.jst.go.jp/article/jscejj/81/8/81_24-00252/_pdf"}],"availableAt":"2025","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=land%20subsidence%20monitoring","dc:title":"land subsidence monitoring"},{"@id":"https://cir.nii.ac.jp/all?q=PSInSAR","dc:title":"PSInSAR"},{"@id":"https://cir.nii.ac.jp/all?q=time-series%20InSAR","dc:title":"time-series InSAR"},{"@id":"https://cir.nii.ac.jp/all?q=C-band%20Synthetic%20Aperture%20Radar","dc:title":"C-band Synthetic Aperture Radar"},{"@id":"https://cir.nii.ac.jp/all?q=Sentinel-1","dc:title":"Sentinel-1"}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360005669141312896","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Evaluation of the Trend of Deformation around the Kanto Region Estimated Using the Time Series of PALSAR-2 Data"}]},{"@id":"https://cir.nii.ac.jp/crid/1360022501344642048","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Slope Displacement Monitoring with Corner Reflectors by PSInSAR Analysis Using Sentinel-1 SAR Data"}]},{"@id":"https://cir.nii.ac.jp/crid/1360024026720026240","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Application of PSInSAR Analysis Using Sentinel-1 SAR Data to Measure External Deformation of Rockfill Dam for Maintenance Management"}]},{"@id":"https://cir.nii.ac.jp/crid/1360298342521538432","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"PS-InSAR Analysis of Collapsed Dam and Extraction of Flood Inundation Areas in Laos Using Sentinel-1 SAR Images"}]},{"@id":"https://cir.nii.ac.jp/crid/1360302474811989376","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Earth and Rock-Filled Dam Monitoring by High-Resolution X-Band Interferometry: Gongming Dam Case Study"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574095385913600","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Permanent scatterers in SAR interferometry"}]},{"@id":"https://cir.nii.ac.jp/crid/1360861291584809728","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Potential of C-Band SAR Interferometry for Dam Monitoring"}]},{"@id":"https://cir.nii.ac.jp/crid/1360861295514816384","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Esa Snap - 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