{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,27]],"date-time":"2026-02-27T06:18:48Z","timestamp":1772173128397,"version":"3.50.1"},"reference-count":35,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2020,1,7]],"date-time":"2020-01-07T00:00:00Z","timestamp":1578355200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"JSPS KAKENHI","award":["17K06468"],"award-info":[{"award-number":["17K06468"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In the Kanto region of Japan, a large quantity of natural gas is dissolved in brine. The large-scale production of gas and iodine in the region has caused large-scale land subsidence in the past. Therefore, continuous and accurate monitoring for subsidence using satellite remote sensing is essential to prevent extreme subsidence and ensure the safety of residences. This study focused on the small baseline subset (SBAS) method to assess ground deformation trends around the Kanto region. Data for the SBAS method was acquired by the Advanced Land Observing Satellite (ALOS)-2 Phased Array type L-band Synthetic Aperture Radar (PALSAR)-2 from 2015 to 2019. A comparison of our results with reference levelling data shows that the SBAS method underestimates displacement. We corrected our results using linear regression and determined the maximum displacement around the Kujyukuri area to be approximately 20 mm\/year; the mean displacement rate for 2015\u20132019 was \u22127.9 \u00b1 2.9 mm\/year. These values exceed those obtained using past PALSAR observations owing to the horizontal displacement after the Great East Japan Earthquake of 2011. Moreover, fewer points were acquired, and the root mean-squared error of each time-series displacement value was larger in our results. Further analysis is needed to address these bias errors.<\/jats:p>","DOI":"10.3390\/s20020339","type":"journal-article","created":{"date-parts":[[2020,1,8]],"date-time":"2020-01-08T03:59:57Z","timestamp":1578455997000},"page":"339","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Evaluation of the Trend of Deformation around the Kanto Region Estimated Using the Time Series of PALSAR-2 Data"],"prefix":"10.3390","volume":"20","author":[{"given":"Takashi","family":"Nonaka","sequence":"first","affiliation":[{"name":"College of Industrial Technology, Nihon University, Chiba 2758575, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tomohito","family":"Asaka","sequence":"additional","affiliation":[{"name":"College of Industrial Technology, Nihon University, Chiba 2758575, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Keishi","family":"Iwashita","sequence":"additional","affiliation":[{"name":"College of Industrial Technology, Nihon University, Chiba 2758575, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7702-9109","authenticated-orcid":false,"given":"Fumitaka","family":"Ogushi","sequence":"additional","affiliation":[{"name":"Harris Geospatial Co., Tokyo 113-0033, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,1,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"475","DOI":"10.3720\/japt.63.475","article-title":"Outline of water-dissolved natural gas field in Chiba Prefecture","volume":"63","author":"Horiguchi","year":"1998","journal-title":"J. Jpn. Assoc. Pet. Technol."},{"key":"ref_2","unstructured":"Kanto Natural Gas Development Co., Ltd. (2019, June 25). History of Lodine. Available online: http:\/\/www.gasukai.co.jp\/english\/iodine\/index2.html."},{"key":"ref_3","unstructured":"Chiba Prefecture (2019, June 25). Land Subsidence in Chiba Prefecture. (In Japanese)."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"53","DOI":"10.5194\/piahs-372-53-2015","article-title":"Ground water management based on monitoring of land subsidence and groundwater levels in the Kanto groundwater basin, central Japan","volume":"372","author":"Furuno","year":"2015","journal-title":"Proc. IAHS"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"9183","DOI":"10.1029\/JB094iB07p09183","article-title":"Mapping small elevation changes over large areas: Differential radar interferometry","volume":"94","author":"Gabriel","year":"1989","journal-title":"J. Geophys. Res."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"138","DOI":"10.1038\/364138a0","article-title":"The displacement field of the Landers earthquake mapped by radar interferometry","volume":"364","author":"Massonnet","year":"1993","journal-title":"Nature"},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Ferretti, A. (2014). Satellite InSAR Data\u2014Reservoir Monitoring from Space, EAGE Publications.","DOI":"10.3997\/9789073834712"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"23275","DOI":"10.1109\/TGRS.2002.803792","article-title":"A new algorithm for surface deformation monitoring based on small baseline differential SAR interferograms","volume":"40","author":"Berardino","year":"2002","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"8","DOI":"10.1109\/36.898661","article-title":"Permanent scatterers in SAR interferometry","volume":"39","author":"Ferretti","year":"2001","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1029\/2004GL021737","article-title":"A new method for measuring deformation on volcanoes and other natural terrains using InSAR persistent scatterers","volume":"31","author":"Hooper","year":"2004","journal-title":"Geophys. Res. Lett."},{"key":"ref_11","unstructured":"Ogushi, F. (2018, January 22\u201326). Monitoring of the Kanto plane in Japan with PALSAR-1 and PALSAR-2 with SBAS method. Proceedings of the JAXA PI Meeting of Global Environment Observation Mission, Tokyo, Japan."},{"key":"ref_12","first-page":"593","article-title":"ALOS\/PALSAR SBAS analysis of surface deformation in the Pacific side of Chiba prefecture, Japan","volume":"16","author":"Asaka","year":"2018","journal-title":"Trans. Jpn. Soc. Aeronaut. Space Sci."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1016\/j.rse.2014.04.011","article-title":"Operational performance of the ALOS global systematic acquisition strategy and observation plans for ALOS-2 PALSAR-2","volume":"155","author":"Rosenqvist","year":"2014","journal-title":"Remote Sens. Environ."},{"key":"ref_14","unstructured":"Japan Aerospace Exploration Agency (2019, July 22). ALOS-2 Project. Available online: https:\/\/www.eorc.jaxa.jp\/ALOS\/en\/top\/about_top.htm."},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Nonaka, T., Asaka, T., Iwashita, K., and Ogushi, F. (2017, January 23\u201328). Estimation of phase noise by time series analysis of ALOS-2 PALSAR-2 data. Proceedings of the IGARSS2017 International Geoscience and Remote Sensing Symposium, Fort Worth, TX, USA.","DOI":"10.1109\/IGARSS.2017.8128228"},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Asaka, T., Nonaka, T., Uchida, Y., and Sugimura, T. (August, January 29). Evaluation of reinforced slope dynamics using ALOS-2\/PALSAR-2. Proceedings of the IGARSS2019 International Geoscience and Remote Sensing Symposium, Yokohama, Japan.","DOI":"10.1109\/IGARSS.2019.8900217"},{"key":"ref_17","unstructured":"Chiba Prefecture (2019, July 22). Monthly Residents Survey Statics. (In Japanese)."},{"key":"ref_18","unstructured":"(2019, June 25). Geospatial Information Authority of Japan, Service to Provide GEONET Data. Available online: https:\/\/terras.gsi.go.jp\/."},{"key":"ref_19","unstructured":"Chiba Prefecture (2019, June 25). Chiba Prefecture Levelling Survey Results. (In Japanese)."},{"key":"ref_20","first-page":"101","article-title":"Location of gas-chemical and metal machinery industries and their business change in Kujukuri area Chiba Prefecture","volume":"28","author":"Tanno","year":"2006","journal-title":"Ann. Hum. Reg. Geogr."},{"key":"ref_21","unstructured":"(2019, June 25). SARMap SBAS Tutorial. Available online: http:\/\/sarmap.ch\/tutorials\/sbas_tutorial_V_2_0.pdf."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Holecz, F., Pasquali, P., Milisavljevic, N., and Closson, D. (2014). Mapping of Ground Deformations with Interferometric Stacking Techniques. Land Application of Radar Remote Sensing, IntechOpen. Available online: https:\/\/www.intechopen.com\/books\/land-applications-of-radar-remote-sensing\/mapping-of-ground-deformations-with-interferometric-stacking-techniques.","DOI":"10.5772\/58225"},{"key":"ref_23","unstructured":"Jarvis, A., Reuter, H., Nelson, A., and Guevara, E. (2019, June 25). Hole-filled SRTM for the Globe Version 4, Available from the CGIAR-CSI SRTM 90m Database. Available online: http:\/\/srtm.csi.cgiar.org."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"4035","DOI":"10.1029\/1998GL900033","article-title":"Radar interferogram filtering for geophysical applications","volume":"25","author":"Goldstein","year":"1998","journal-title":"Geophys. Res. Lett."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"813","DOI":"10.1109\/36.673674","article-title":"A novel phase unwrapping method based on network programming","volume":"36","author":"Costantini","year":"1998","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Nonaka, T., Asaka, T., Iwashita, K., and Ogushi, F. (2019, January 3\u20136). Analysis of the trend of the deformation around Kanto region estimated by the time series of PALSAR-2 data. Proceedings of the Geoinformation for Disaster Management 2019, Prague, Czech Republic.","DOI":"10.3390\/s20020339"},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Aimaiti, Y., Yamazaki, F., and Liu, W. (2018). Multi-sensor InSAR analysis of progressive land subsidence over coastal city of Urayasu, Japan. Remote Sens., 10.","DOI":"10.3390\/rs10081304"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"1151","DOI":"10.1080\/01431161.2017.1399474","article-title":"Monitoring land deformation in Changzhou city (China) with multi-band InSAR data sets from 2006 to 2012","volume":"39","author":"Lu","year":"2018","journal-title":"Int. J. Remote Sens."},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Hansen, R. (2001). Radar Interferometry: Data Interpretation and Error Analysis, Springer Netherlands.","DOI":"10.1007\/0-306-47633-9"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"950","DOI":"10.1109\/36.175330","article-title":"Decorrelation in interferometric radar echoes","volume":"30","author":"Zebker","year":"1992","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Motooka, T., Isoguchi, O., Sakashita, M., and Shimada, M. (2018, January 22\u201327). Results of ALOS-2 PALSAR-2 calibration and validation after 3 years of operation. Proceedings of the IGARSS2018 International Geoscience and Remote Sensing Symposium, Valencia, Spain.","DOI":"10.1109\/IGARSS.2018.8519118"},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Nonaka, T., Asaka, T., and Iwashita, K. (2018). Evaluation of atmospheric effects on interferograms using DEM errors of fixed ground points. Sensors, 18.","DOI":"10.3390\/s18072336"},{"key":"ref_33","unstructured":"Nonaka, T., Asaka, T., and Iwashita, K. (2016, January 12\u201313). Feature of DEM produced by Interferometric technique by ALOS PALSAR data. Proceedings of the 60th (2016 Spring) Meeting of the Remote Sensing Society of Japan, Chiba, Japan. (In Japanese)."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"195","DOI":"10.1016\/j.rse.2006.01.023","article-title":"A quantitative assessment of SBAS algorithm performance for surface deformation retrieval from DInSAR data","volume":"102","author":"Casu","year":"2006","journal-title":"Remote Sens. Environ."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Pepe, A., Bonano, M., Zhao, Q., Yang, T., and Wang, H. (2016). The use of C-\/X-band time-gapped SAR data and geotechnical models for the study of Shanghai\u2019s ocean-reclaimed lands through the SBAS-DInSAR technique. Remote Sens., 8.","DOI":"10.20944\/preprints201608.0083.v1"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/20\/2\/339\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T13:28:56Z","timestamp":1760362136000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/20\/2\/339"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,1,7]]},"references-count":35,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2020,1]]}},"alternative-id":["s20020339"],"URL":"https:\/\/doi.org\/10.3390\/s20020339","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,1,7]]}}}