{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,23]],"date-time":"2026-02-23T16:27:52Z","timestamp":1771864072765,"version":"3.50.1"},"reference-count":55,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2017,5,5]],"date-time":"2017-05-05T00:00:00Z","timestamp":1493942400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The Terrain Observation by Progressive Scans (TOPS) acquisition mode of the Sentinel-1 mission provides a wide coverage per acquisition with resolutions of 5 m in range and 20 m in azimuth, which makes this acquisition mode attractive for glacier velocity monitoring. Here, we retrieve surface velocities from the southern Ellesmere Island ice caps (Canadian Arctic) using both offset tracking and Differential Interferometric Synthetic Aperture Radar (D-InSAR) techniques and combining ascending and descending passes. We optimise the offset tracking technique by omitting the azimuth offsets. By doing so, we are able to improve the final resolution of the velocity product, as Sentinel-1 shows a lower resolution in the azimuth direction. Simultaneously, we avoid the undesired ionospheric effect manifested in the data as azimuth streaks. The D-InSAR technique shows its merits when applied to slow-moving areas, while offset tracking is more suitable for fast-moving areas. This research shows that the methods used here are complementary and the use of both to determine glacier velocities is better than only using one or the other. We observe glacier surface velocities of up to 1200 m year \u2212 1 for the fastest tidewater glaciers. The land-terminating glaciers show typical velocities between 12 and 33 m year \u2212 1 , though with peaks up to 150 m year \u2212 1 in narrowing zones of the confining valleys.<\/jats:p>","DOI":"10.3390\/rs9050442","type":"journal-article","created":{"date-parts":[[2017,5,5]],"date-time":"2017-05-05T10:31:08Z","timestamp":1493980268000},"page":"442","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":80,"title":["Glacier Surface Velocity Retrieval Using D-InSAR and Offset Tracking Techniques Applied to Ascending and Descending Passes of Sentinel-1 Data for Southern Ellesmere Ice Caps, Canadian Arctic"],"prefix":"10.3390","volume":"9","author":[{"given":"Pablo","family":"S\u00e1nchez-G\u00e1mez","sequence":"first","affiliation":[{"name":"Departamento de Matem\u00e1tica Aplicada a las TIC, ETSI Telecomunicaci\u00f3n, Universidad Polit\u00e9cnica de Madrid, 28040 Madrid, Spain"}]},{"given":"Francisco","family":"Navarro","sequence":"additional","affiliation":[{"name":"Departamento de Matem\u00e1tica Aplicada a las TIC, ETSI Telecomunicaci\u00f3n, Universidad Polit\u00e9cnica de Madrid, 28040 Madrid, Spain"}]}],"member":"1968","published-online":{"date-parts":[[2017,5,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"579","DOI":"10.1080\/01431161.2010.517807","article-title":"New aspects of global climate-dynamics research and remote sensing","volume":"32","author":"Cracknell","year":"2011","journal-title":"Int. J. Remote Sens."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"84","DOI":"10.1016\/j.rse.2011.07.023","article-title":"ESA\u2019s sentinel missions in support of earth system science","volume":"120","author":"Berger","year":"2012","journal-title":"Remote Sens. Environ."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"91","DOI":"10.1016\/j.rse.2011.09.026","article-title":"Sentinels for science: Potential of Sentinel-1, -2, and -3 missions for scientific observations of ocean, cryosphere, and land","volume":"120","author":"Rott","year":"2012","journal-title":"Remote Sens. Environ."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Potin, P., Rosich, B., Roeder, J., and Bargellini, P. (2014, January 13\u201318). Sentinel-1 mission operations concept. Proceedings of the IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Qu\u00e9bec, QC, Canada.","DOI":"10.1109\/IGARSS.2014.6946713"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1016\/j.rse.2011.08.028","article-title":"The European Earth monitoring (GMES) programme: Status and perspectives","volume":"120","author":"Aschbacher","year":"2012","journal-title":"Remote Sens. Environ."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"9","DOI":"10.1016\/j.rse.2011.05.028","article-title":"GMES Sentinel-1 mission","volume":"120","author":"Torres","year":"2012","journal-title":"Remote Sens. Environ."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Geudtner, D., Torres, R., Snoeij, P., Davidson, M., and Rommen, B. (2014, January 13\u201318). Sentinel-1 system capabilities and applications. Proceedings of the 2014 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Qu\u00e9bec City, QC, Canada.","DOI":"10.1109\/IGARSS.2014.6946711"},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Grandin, R. (2015, January 23\u201327). Interferometric processing of SLC Sentinel-1 TOPS data. Proceedings of the FRINGE\u201915: Advances in the Science and Applications of SAR Interferometry and Sentinel-1 InSAR Workshop, Frascati, Italy.","DOI":"10.5270\/Fringe2015.pp116"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1709","DOI":"10.1109\/JSTARS.2014.2360237","article-title":"Speckle tracking and interferometric processing of TerraSAR-X TOPS data for mapping nonstationary scenarios","volume":"8","author":"Scheiber","year":"2014","journal-title":"IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"3179","DOI":"10.1109\/TGRS.2011.2178247","article-title":"TOPS interferometry with TerraSAR-X","volume":"50","author":"Scheiber","year":"2012","journal-title":"IEEE Trans. Geosci. Remote"},{"key":"ref_11","unstructured":"Marotti, L., Prats-Iraola, P., Scheiber, R., Wollstadt, S., and Reigher, A. (2011, January 19\u201323). TOPS Differential SAR interferometry with TerraSAR-X. Proceedings of the \u2018Fringe 2011 Workshop\u2019, Frascati, Italy."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"25","DOI":"10.1109\/36.655315","article-title":"Interferometric estimation of three-dimensional ice-flow using ascending and descending passes","volume":"36","author":"Joughin","year":"1998","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"273","DOI":"10.1038\/34635","article-title":"Three-dimensional glacial flow and surface elevation measured with radar interferometry","volume":"391","author":"Mohr","year":"1998","journal-title":"Nature"},{"key":"ref_14","first-page":"545","article-title":"Glacier surface velocity estimation using SAR interferometry technique applying ascending and descending passes in Himalayas","volume":"13","author":"Kumar","year":"2011","journal-title":"Int. J. Appl. Earth Obs. Geoinf."},{"key":"ref_15","unstructured":"Werner, C., Wegm\u00fcller, U., Strozzi, T., and Wiesmann, A. (2005, January 29). Precision estimation of local offsets between pairs of SAR SLCs and detected SAR images. Proceedings of the IGARSS 2005: IEEE International Geoscience and Remote Sensing Symposium, Seoul, Korea."},{"key":"ref_16","unstructured":"Fallourd, R., Vernier, F., Yan, Y., Trouve, E., and Bolon, P. (2010, January 7\u201310). Alpine glacier 3D displacement derived from ascending and descending TerraSAR-X images on Mont-Blanc test site. Proceedings of the 8th European Conference on Synthetic Aperture Radar (EUSAR), Aachen, Germany."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"F03005","DOI":"10.1029\/2004JF000233","article-title":"Glacier surge dynamics of Sortebr\u00e6, east Greenland, from synthetic aperture radar feature tracking","volume":"110","author":"Pritchard","year":"2005","journal-title":"J. Geophys. Res."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1109\/TGRS.2002.805079","article-title":"Glacier motion estimation using SAR offset-tracking procedures","volume":"40","author":"Strozzi","year":"2002","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_19","unstructured":"Strozzi, T., Kouraev, A., Wiesmann, A., Sharov, A., Wegm\u00fcller, U., and Werner, C. (August, January 31). Estimation of Arctic glacier motion with satellite L-band SAR data. Proceedings of the IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2006), Denver, CO, USA."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Dall, J, Kusk, A., Nielsen, U., and Boncori, J.P.M. (2015, January 23\u201327). Ice velocity mapping using TOPS SAR data and offset tracking. Proceedings of the FRINGE\u201915: Advances in the Science and Applications of SAR Interferometry and Sentinel-1 InSAR Workshop, Frascati, Italy.","DOI":"10.5270\/Fringe2015.pp91"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"9371","DOI":"10.3390\/rs70709371","article-title":"The Sentinel-1 Mission: New Opportunities for Ice Sheet Observations","volume":"7","author":"Nagler","year":"2015","journal-title":"Remote Sens."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"195","DOI":"10.3189\/172756402781817978","article-title":"Ice-sheet velocity mapping: A combined interferometric and speckle-tracking approach","volume":"34","author":"Joughin","year":"2002","journal-title":"Ann. Glaciol."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"102","DOI":"10.1109\/LGRS.2006.885885","article-title":"Synergistic fusion of interferometric and speckle-tracking methods for deriving surface velocity from interferometric SAR data","volume":"4","author":"Liu","year":"2007","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Gray, L., Joughin, I., Tulaczyk, S., Splkes, V.B., Bindschadler, R., and Jezek, K. (2005). Evidence for subglacial water transport in the West Antarctic Ice Sheet through three-dimensional satellite radar interferometry. Geophys. Res. Lett., 32.","DOI":"10.1029\/2004GL021387"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"315","DOI":"10.3189\/172756402781817833","article-title":"Three-dimensional glacier surface motion maps at the Gjalp eruption site, Iceland, inferred from combining InSAR and other ice-displacement data","volume":"34","author":"Gudmundsson","year":"2002","journal-title":"Ann. Glaciol."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"2753","DOI":"10.3390\/rs4092753","article-title":"Mapping of ice motion in Antarctica using synthetic-aperture radar data","volume":"4","author":"Mouginot","year":"2012","journal-title":"Remote Sens."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.earscirev.2014.02.005","article-title":"Resolving three-dimensional surface displacements from InSAR measurements: A review","volume":"133","author":"Hu","year":"2014","journal-title":"Earth-Sci. Rev."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Wegm\u00fcller, U., Werner, C., Strozzi, T., and Wiesmann, A. (August, January 31). Ionospheric electron concentration effects on SAR and INSAR. Proceedings of the IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2006), Denver, CO, USA.","DOI":"10.1109\/IGARSS.2006.956"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1029\/2000GL000016","article-title":"Influence of Ionospheric Electron Density Fluctuations on Satellite Radar Interferometry","volume":"27","author":"Gray","year":"2000","journal-title":"Geophys. Res. Lett."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Kargel, J.S., Leonard, G.J., Bishop, M.P., K\u00e4\u00e4b, A., and Raup, B.H. (2014). Remote sensing of recent glacier changes in the Canadian Arctic. Global Land Ice Measurements from Space, Springer. Caption 9.","DOI":"10.1007\/978-3-540-79818-7"},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Radi\u0107, V., and Hock, R (2010). Regional and global volumes of glaciers derived from statistical upscaling of glacier inventory data. J. Geophys. Res., 115.","DOI":"10.1029\/2009JF001373"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"4586","DOI":"10.1175\/JCLI4268.1","article-title":"Influence of the Arctic Circumpolar Vortex on the Mass Balance of Canadian High Arctic Glaciers","volume":"20","author":"Gardner","year":"2007","journal-title":"J. Clim."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"1605","DOI":"10.1175\/1520-0450(1987)026<1605:DSAFEM>2.0.CO;2","article-title":"Developing Synoptic Analogs for Extreme Mass Balance Conditions on Queen Elizabeth Island Ice Caps","volume":"26","author":"Alt","year":"1987","journal-title":"J. Clim. Appl. Meteorol."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"870","DOI":"10.1002\/grl.50214","article-title":"Irreversible mass loss of Canadian Arctic Archipelago glaciers","volume":"40","author":"Lenaerts","year":"2013","journal-title":"Geophys. Res. Lett."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"8741","DOI":"10.1029\/96JB00104","article-title":"A Global, Self-consistent, Hierarchical, High-resolution Shoreline Database","volume":"101","author":"Wessel","year":"1996","journal-title":"J. Geophys. Res."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"537","DOI":"10.3189\/2014JoG13J176","article-title":"The Randolph Glacier Inventory: A globally complete inventory of glaciers","volume":"60","author":"Pfeffer","year":"2014","journal-title":"J. Glaciol."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"417","DOI":"10.3189\/172756405781813122","article-title":"Mass balance of glaciers in the Queen Elizabeth Islands, Nunavut, Canada","volume":"42","author":"Koerner","year":"2005","journal-title":"Ann. Glaciol."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"357","DOI":"10.1038\/nature10089","article-title":"Sharply increased mass loss from glaciers and ice caps in the Canadian Arctic Archipelago","volume":"473","author":"Gardner","year":"2011","journal-title":"Nature"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"484","DOI":"10.1002\/2013GL058558","article-title":"Glacier velocities and dynamic ice discharge from the Queen Elizabeth Islands, Nunavut, Canada","volume":"41","author":"Burgess","year":"2014","journal-title":"Geophys. Res. Lett."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"024016","DOI":"10.1088\/1748-9326\/aa5b04","article-title":"Mass budget of the glaciers and ice caps of the Queen Elizabeth Islands, Canada, from 1991 to 2015","volume":"12","author":"Millan","year":"2017","journal-title":"Environ. Res. Lett."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1002\/2015JF003708","article-title":"Characterizing interannual variability of glacier dynamics and dynamic discharge (1999\u20132015) for the ice masses of Ellesmere and Axel Heiberg Islands, Nunavut, Canada","volume":"121","author":"Davis","year":"2016","journal-title":"J. Geophys. Res. Earth Surf."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"73","DOI":"10.3189\/172756403781816301","article-title":"The distribution and flow characteristics of surge-type glaciers in the Canadian High Arctic","volume":"36","author":"Copland","year":"2003","journal-title":"Ann. Glaciol."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"391","DOI":"10.3189\/002214308785837048","article-title":"Iceberg calving rates from northern Ellesmere Island ice caps, Canadian Arctic, 1999\u20132003","volume":"54","author":"Williamson","year":"2008","journal-title":"J. Glaciol."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"225","DOI":"10.5589\/m05-010","article-title":"Glacier dynamics in the Canadian High Arctic from RADARSAT-1 speckle tracking","volume":"31","author":"Short","year":"2005","journal-title":"Can. J. Remote Sens."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"1103","DOI":"10.5194\/tc-6-1103-2012","article-title":"Accelerated contributions of Canada\u2019s Baffin and Bylot Island glaciers to sea level rise over the past half century","volume":"6","author":"Gardner","year":"2012","journal-title":"Cryosphere"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"1917","DOI":"10.1109\/TGRS.2002.803848","article-title":"Burst-mode and ScanSAR interferometry","volume":"40","author":"Holzner","year":"2002","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"2352","DOI":"10.1109\/TGRS.2006.873853","article-title":"TOPSAR: Terrain observation by progressive scans","volume":"44","author":"Guarnieri","year":"2006","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_48","unstructured":"Natural Resources Canada (NRCan) (2016). Canadian Digital Elevation Model Product Specifications, 1.1 ed."},{"key":"ref_49","doi-asserted-by":"crossref","unstructured":"Wegm\u00fcller, U., Werner, C., Strozzi, T., Wiesmann, A., Othmar, F., and Santoro, M. (2015, January 23\u201327). Sentinel-1 support in the GAMMA software. Proceedings of the FRINGE\u201915: Advances in the Science and Applications of SAR Interferometry and Sentinel-1 InSAR Workshop, Frascati, Italy.","DOI":"10.5270\/Fringe2015.pp70"},{"key":"ref_50","doi-asserted-by":"crossref","unstructured":"Schellenberger, T., van Wychen, W., Copland, L., K\u00e4\u00e4b, A., and Gray, L. (2016). An Inter-Comparison of Techniques for Determining Velocitities of Maritime Arctic Glaciers, Svalbard, Using Radarsat-2 Wide Fine Mode Data. Remote Sens., 8.","DOI":"10.20944\/preprints201609.0038.v1"},{"key":"ref_51","unstructured":"Guarnieri, A.M., Mancon, S., and Tebaldini, S. (2015, January 23\u201327). Sentinel-1 precise orbit calibration and validation. Proceedings of FRINGE\u201915: Advances in the Science and Applications of SAR Interferometry and Sentinel-1 InSAR Workshop, Frascati, Italy."},{"key":"ref_52","doi-asserted-by":"crossref","unstructured":"Xu, B., Li, Z., Feng, G., Zhang, Z., Wang, Q., Hu, J., and Chen, X. (2016). Continent-Wide 2-D Co-Seismic Deformation of the 2015 Mw 8.3 Illapel, Chile Earthquake Derived from Sentinel-1A Data: Correction of Azimuth Co-Registration Error. Remote Sens., 8.","DOI":"10.3390\/rs8050376"},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"3501","DOI":"10.1029\/2000GL012484","article-title":"Penetration depth of interferometric synthetic-aperture radar signals in snow and ice","volume":"28","author":"Rignot","year":"2001","journal-title":"Geophys. Res. Lett."},{"key":"ref_54","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_55","doi-asserted-by":"crossref","first-page":"172","DOI":"10.1016\/j.rse.2007.05.019","article-title":"The potential of satellite radar interferometry and feature tracking for monitoring flow rates of Himalayan glaciers","volume":"111","author":"Luckman","year":"2007","journal-title":"Remote Sens. Environ."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/9\/5\/442\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T18:34:44Z","timestamp":1760207684000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/9\/5\/442"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2017,5,5]]},"references-count":55,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2017,5]]}},"alternative-id":["rs9050442"],"URL":"https:\/\/doi.org\/10.3390\/rs9050442","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2017,5,5]]}}}