{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,15]],"date-time":"2026-03-15T14:03:26Z","timestamp":1773583406518,"version":"3.50.1"},"reference-count":45,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2021,2,27]],"date-time":"2021-02-27T00:00:00Z","timestamp":1614384000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["41771402, 41804009, 42071410"],"award-info":[{"award-number":["41771402, 41804009, 42071410"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"National Key R&amp;D Program of China","award":["No.2017YFB0502700"],"award-info":[{"award-number":["No.2017YFB0502700"]}]},{"name":"the Sichuan Science and Technology Program","award":["No. 2019ZDZX0042, 2020JDTD0003, 2020YJ0322"],"award-info":[{"award-number":["No. 2019ZDZX0042, 2020JDTD0003, 2020YJ0322"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJGI"],"abstract":"<jats:p>Significant seasonal fluctuations could occur in the regional scattering characteristics and surface deformation of saline soil, and cause decorrelation, which limits the application of the conventional time-series InSAR (TS-InSAR). For extending the saline-soil deformation monitoring capability, this paper presents an improved TS-InSAR approach, based on the interferometric coherence statistics and high-coherence interferogram refinement. By constructing a network of the refined interferograms, high-accuracy ground deformation can be extracted through the weighted least square estimation and the coherent target refinement. To extract the high-accuracy deformation of a representative saline soil area in the Qarhan Salt Lake, 119 C-band Sentinel-1A images collected between May 2015 and May 2020 are selected as the data source. Subsequently, 845 refined interferograms are selected from all possible interferograms to conduct the network inversion, based on the related thresholds (the temporal baseline &lt;49 days, the average spatial coherences &gt;0.5, respectively). Compared with the conventional TS-InSAR measurements, both the accuracy and reliability of the extracted deformation results of the saline soil increased dramatically. Furthermore, the testing results indicate that the improved TS-InSAR method has advantages on the deformation extraction in the saline soil region, and is adaptive to reflecting the typical seasonal variations of the saline soil.<\/jats:p>","DOI":"10.3390\/ijgi10030112","type":"journal-article","created":{"date-parts":[[2021,2,27]],"date-time":"2021-02-27T03:44:31Z","timestamp":1614397471000},"page":"112","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Saline-Soil Deformation Extraction Based on an Improved Time-Series InSAR Approach"],"prefix":"10.3390","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8756-2211","authenticated-orcid":false,"given":"Wei","family":"Xiang","sequence":"first","affiliation":[{"name":"Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0809-7682","authenticated-orcid":false,"given":"Rui","family":"Zhang","sequence":"additional","affiliation":[{"name":"Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China"},{"name":"State-Province Joint Engineering Laboratory of Spatial Information Technology of High-Speed Rail Safety, Southwest Jiaotong University, Chengdu 610031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guoxiang","family":"Liu","sequence":"additional","affiliation":[{"name":"Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China"},{"name":"State-Province Joint Engineering Laboratory of Spatial Information Technology of High-Speed Rail Safety, Southwest Jiaotong University, Chengdu 610031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6532-9606","authenticated-orcid":false,"given":"Xiaowen","family":"Wang","sequence":"additional","affiliation":[{"name":"Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenfei","family":"Mao","sequence":"additional","affiliation":[{"name":"Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7056-1124","authenticated-orcid":false,"given":"Bo","family":"Zhang","sequence":"additional","affiliation":[{"name":"Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3839-2794","authenticated-orcid":false,"given":"Yin","family":"Fu","sequence":"additional","affiliation":[{"name":"Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tingting","family":"Wu","sequence":"additional","affiliation":[{"name":"Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,2,27]]},"reference":[{"key":"ref_1","first-page":"734","article-title":"New and potential technology for observation of earth from space: Synthetic aperture radar interferometry","volume":"15","author":"Liu","year":"2000","journal-title":"Adv. Earth Sci."},{"key":"ref_2","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_3","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.tecto.2011.10.013","article-title":"Recent advances in SAR interferometry time series analysis for measuring crustal deformation","volume":"514\u2013517","author":"Hooper","year":"2012","journal-title":"Tectonophysics"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"441","DOI":"10.1029\/97RG03139","article-title":"Radar interferometry and its application to changes in the earth\u2019s surface","volume":"36","author":"Massonnet","year":"1998","journal-title":"Rev. Geophys."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"R1","DOI":"10.1088\/0266-5611\/14\/4\/001","article-title":"Synthetic aperture radar interferometry","volume":"14","author":"Bamler","year":"1998","journal-title":"Inv. Prob."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"333","DOI":"10.1109\/5.838084","article-title":"Synthetic aperture radar interferometry","volume":"88","author":"Rosen","year":"2000","journal-title":"Proc. IEEE"},{"key":"ref_7","unstructured":"Buckley, S.M. (2000). Radar Interferometry Measurement of Land Subsidence. [Ph.D. Thesis, University Texas]."},{"key":"ref_8","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_9","doi-asserted-by":"crossref","first-page":"2202","DOI":"10.1109\/36.868878","article-title":"Nonlinear subsidence rate estimation using permanent scatterers in differential SAR interferometry","volume":"38","author":"Ferretti","year":"2000","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Farolfi, G., Piombino, A., and Catani, F. (2019). Fusion of GNSS and Satellite Radar Interferometry: Determination of 3D Fine-Scale Map of Present-Day Surface Displacements in Italy as Expressions of Geodynamic Processes. Remote Sens., 11.","DOI":"10.3390\/rs11040394"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1016\/S0013-7952(02)00195-3","article-title":"Monitoring landslides and tectonic motions with the Permanent Scatterers Technique","volume":"68","author":"Colesanti","year":"2003","journal-title":"Eng. Geol."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"5637","DOI":"10.1109\/TGRS.2017.2711037","article-title":"Sequential estimator: Toward efficient InSAR time series analysis","volume":"55","author":"Ansari","year":"2017","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"B9","DOI":"10.1029\/2002JB002267","article-title":"Time-dependent land uplift and subsidence in the Santa Clara valley, California, from a large interferometric synthetic aperture radar data set","volume":"108","author":"Schmidt","year":"2003","journal-title":"J. Geophys. Res. Solid Earth"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1029\/2008GL034654","article-title":"A multi-temporal InSAR method incorporating both persistent scatterer and small baseline approaches","volume":"35","author":"Hooper","year":"2008","journal-title":"Geophys. Res. Lett."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"3209","DOI":"10.1109\/TGRS.2009.2028797","article-title":"Estimating spatiotemporal ground deformation with improved persistent scatterer radar interferometry","volume":"47","author":"Liu","year":"2009","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"4725","DOI":"10.3390\/s8084725","article-title":"Detecting land subsidence in Shanghai by PS-networking SAR interferometry","volume":"8","author":"Liu","year":"2008","journal-title":"Sensors"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"159","DOI":"10.1109\/JSTARS.2010.2067446","article-title":"Exploration of subsidence estimation by persistent scatterer InSAR on time series of high resolution TerraSAR-X images","volume":"4","author":"Liu","year":"2011","journal-title":"IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"2375","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_19","doi-asserted-by":"crossref","first-page":"1377","DOI":"10.1109\/TGRS.2004.828196","article-title":"A small-baseline approach for investigating deformations on full-resolution differential SAR interferograms","volume":"42","author":"Lanari","year":"2004","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"3460","DOI":"10.1109\/TGRS.2011.2124465","article-title":"A new algorithm for processing interferometric data-stacks: SqueeSAR","volume":"49","author":"Ferretti","year":"2011","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"271","DOI":"10.1109\/TGRS.2011.2160644","article-title":"Repeat-Pass SAR Interferometry with Partially Coherent Targets","volume":"50","author":"Perissin","year":"2011","journal-title":"IEEE Trans. Geoence Remote Sens."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"277","DOI":"10.1016\/j.rse.2006.11.015","article-title":"Surface deformation of Long Valley Caldera and Mono Basin, California, investigated with the SBAS-InSAR approach","volume":"108","author":"Tizzani","year":"2007","journal-title":"Remote Sens. Environ."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"438","DOI":"10.1109\/LGRS.2008.916199","article-title":"SBAS-DInSAR analysis of very extended areas: First results on a 60000-km2 test site","volume":"5","author":"Casu","year":"2008","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"3823","DOI":"10.1109\/JSTARS.2014.2333535","article-title":"Soil salinity characterization using polarimetric insar coherence: Case studies in tunisia and morocco","volume":"8","author":"Barbouchi","year":"2015","journal-title":"IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"6608","DOI":"10.1109\/TGRS.2015.2444431","article-title":"Phase Inconsistencies and Multiple Scattering in SAR Interferometry","volume":"53","author":"Francesco","year":"2015","journal-title":"IEEE Trans. Geoence Remote Sens."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s00190-020-01432-1","article-title":"Sentinel-1 TOPS co-registration over low-coherence areas and its application to velocity estimation using the all pairs shortest path algorithm","volume":"94","author":"Jiang","year":"2020","journal-title":"J. Geod."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"777","DOI":"10.1109\/TGRS.2016.2614925","article-title":"A network-based enhanced spectral diversity approach for TOPS time-series analysis","volume":"55","author":"Fattahi","year":"2016","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_28","first-page":"6","article-title":"Research on the salt soluble disasters of saline lake subgrade along the Qinghai-Tibet railway in Chaerhan Salt Lake region","volume":"32","author":"Gao","year":"2015","journal-title":"J. Railw. Eng. Soc."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1911","DOI":"10.1109\/TGRS.2013.2256428","article-title":"Detecting subsidence in coastal areas by ultrashort-baseline tcpinsar on the time series of high-resolution terrasar-x images","volume":"52","author":"Liu","year":"2014","journal-title":"IEEE Trans. Geoence Remote Sens."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"104331","DOI":"10.1016\/j.cageo.2019.104331","article-title":"Small baseline InSAR time series analysis: Unwrapping error correction and noise reduction","volume":"133","author":"Zhang","year":"2019","journal-title":"Comput. Geosci."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"2374","DOI":"10.1109\/TGRS.2006.873207","article-title":"On the extension of the minimum cost flow algorithm for phase unwrapping of multitemporal differential SAR interferograms","volume":"44","author":"Pepe","year":"2006","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_32","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":"1997","journal-title":"IEEE Trans. Geoence Remote Sens."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"4109","DOI":"10.1109\/TGRS.2018.2826045","article-title":"Efficient phase estimation for interferogram stacks","volume":"56","author":"Ansari","year":"2018","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"5671","DOI":"10.1109\/TGRS.2016.2566604","article-title":"Phase estimation for distributed scatterers in InSAR stacks using integer least squares estimation","volume":"54","author":"Martins","year":"2016","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_35","first-page":"8","article-title":"Maximum likelihood estimation for SAR interferometry","volume":"94","author":"Seymour","year":"1994","journal-title":"Geosci. Remote Sens. Symp. Igarss"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"71","DOI":"10.1007\/s10498-008-9046-z","article-title":"Closed basin brine evolution and the influence of Ca-Cl inflow waters: Death Valley and Bristol Dry Lake California, Qaidam Basin, China, and Salar de Atacama, Chile","volume":"15","author":"Lowenstein","year":"2009","journal-title":"Aquat. Geochem."},{"key":"ref_37","first-page":"193","article-title":"Chemical elements in core sediments of the Qarhan Salt Lake and palaeoclimate evolution during 94\u20139 ka","volume":"2","author":"Wei","year":"2016","journal-title":"Acta Geosci. Sin."},{"key":"ref_38","first-page":"13","article-title":"The Formation of the Qarhan Saline Lakes as Viewed from the Neotectonic Movement","volume":"64","author":"Zhu","year":"1990","journal-title":"Acta Geol. Sin."},{"key":"ref_39","unstructured":"Yu, S.S., Tan, H.B., Liu, X.Q., and Cao, G.C. (2009). Sustainable Utilization of Qarhan Salt Lake Resources, Science Press. (In Chinese)."},{"key":"ref_40","first-page":"373","article-title":"Characteristics of rock salt and salt-dissolution engineering geology and subgrade construction in Chaerhan Salt Lake along Qinghai-Tibet railway","volume":"000(0z1)","author":"Yang","year":"2005","journal-title":"J. Railw. Eng. Soc."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"241","DOI":"10.1016\/0148-9062(88)90330-0","article-title":"Long-term monitoring of subgrade stability of the Qinghai-Tibet railway in the Charhan playa region","volume":"25","author":"Zhang","year":"1988","journal-title":"Int. J. Rock Mech. Min. Ences Geomech. Abstr."},{"key":"ref_42","first-page":"52","article-title":"An analysis of the stability of railway in Chaerhan Saline Lake area","volume":"3","author":"Sun","year":"1980","journal-title":"J. Beijing Univ. Technol."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"2008","DOI":"10.1002\/2016JD025753","article-title":"Generation of real-time mode high-resolution water vapor fields from GPS observations","volume":"122","author":"Yu","year":"2017","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"109","DOI":"10.1016\/j.rse.2017.10.038","article-title":"Interferometric synthetic aperture radar atmospheric correction using a GPS-based iterative tropospheric decomposition model","volume":"204","author":"Yu","year":"2018","journal-title":"Remote Sens. Environ."},{"key":"ref_45","first-page":"97","article-title":"Ore-forming Geological Background of K-Mg Salt in Qarhan Salt Lake","volume":"41","author":"Wang","year":"2008","journal-title":"Northwestern Geol."}],"container-title":["ISPRS International Journal of Geo-Information"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2220-9964\/10\/3\/112\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T05:29:46Z","timestamp":1760160586000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2220-9964\/10\/3\/112"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,2,27]]},"references-count":45,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2021,3]]}},"alternative-id":["ijgi10030112"],"URL":"https:\/\/doi.org\/10.3390\/ijgi10030112","relation":{},"ISSN":["2220-9964"],"issn-type":[{"value":"2220-9964","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,2,27]]}}}