{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:23:44Z","timestamp":1760239424778,"version":"build-2065373602"},"reference-count":63,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2020,11,14]],"date-time":"2020-11-14T00:00:00Z","timestamp":1605312000000},"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>Traditionally, sea level is observed at tide gauge stations, which usually also serve as height reference stations for national leveling networks and therefore define a height system of a country. One of the main deficiencies to use tide gauge data for geodetic sea level research and height systems unification is that only a few stations are connected to the geometric network of a country by operating permanent GNSS receivers next to the tide gauge. As a new observation technique, absolute positioning by SAR using active transponders on ground can fill this gap by systematically observing time series of geometric heights at tide gauge stations. By additionally knowing the tide gauge geoid heights in a global height reference frame, one can finally obtain absolute sea level heights at each tide gauge. With this information the impact of climate change on the sea level can be quantified in an absolute manner and height systems can be connected across the oceans. First results from applying this technique at selected tide gauges at the Baltic coasts are promising but also exhibit some problems related to the new technique. The paper presents the concept of using the new observation type in an integrated sea level observing system and provides some early results for SAR positioning in the Baltic sea area.<\/jats:p>","DOI":"10.3390\/rs12223747","type":"journal-article","created":{"date-parts":[[2020,11,16]],"date-time":"2020-11-16T21:48:52Z","timestamp":1605563332000},"page":"3747","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Geodetic SAR for Height System Unification and Sea Level Research\u2014Observation Concept and Preliminary Results in the Baltic Sea"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2615-3681","authenticated-orcid":false,"given":"Thomas","family":"Gruber","sequence":"first","affiliation":[{"name":"Astronomical and Physical Geodesy, Technical University of Munich (TUM), 80333 Munich, 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Geophys."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"96","DOI":"10.1016\/j.jog.2012.03.005","article-title":"Sea level: A review of present-day and recent-past changes and variability","volume":"58","author":"Meyssignac","year":"2012","journal-title":"J. Geodyn."},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Stammer, D., and Cazenave, A. (2017). Satellite Altimetry over Oceans and Land Surfaces, CRC Press.","DOI":"10.1201\/9781315151779"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"435","DOI":"10.1080\/01490419.2010.491031","article-title":"Estimating Mean Sea Level Change from the TOPEX - and Jason Altimeter Missions","volume":"33","author":"Nerem","year":"2010","journal-title":"Mar. Geod."},{"key":"ref_5","first-page":"287","article-title":"The Permanent Service for Mean Sea Level: An Update to the 21stCentury","volume":"19","author":"Woodworth","year":"2003","journal-title":"J. Coast. Res."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1639","DOI":"10.1002\/2013GL059039","article-title":"Evidence for a differential sea level rise between hemispheres over the twentieth century","volume":"41","author":"Marcos","year":"2014","journal-title":"Geophys. Res. Lett."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"396","DOI":"10.1016\/j.gloplacha.2007.02.002","article-title":"Geocentric sea-level trend estimates from GPS analyses at relevant tide gauges world-wide","volume":"57","author":"Bouin","year":"2007","journal-title":"Glob. Planet. Chang."},{"key":"ref_8","first-page":"6","article-title":"Mitigating the effects of vertical land motion in tide gauge records using a state-of-the-art GPS velocity field","volume":"98\u201399","author":"Gravelle","year":"2012","journal-title":"Glob. Planet. Chang."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"302","DOI":"10.2478\/v10156-012-0004-8","article-title":"Towards worldwide height system unification using ocean information","volume":"2","author":"Woodworth","year":"2012","journal-title":"J. Geod. Sci."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"270","DOI":"10.2478\/v10156-012-0001-y","article-title":"Intercontinental height datum connection with GOCE and GPS-levelling data","volume":"2","author":"Gruber","year":"2012","journal-title":"J. Geod. Sci."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"9","DOI":"10.1007\/s00190-010-0412-4","article-title":"Global sea-level rise and its relation to the terrestrial reference frame","volume":"85","author":"Collilieux","year":"2011","journal-title":"J. Geod."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"W\u00f6ppelmann, G., Letetrel, C., Santamaria, A., Bouin, M.-N., Collilieux, X., Altamimi, Z., Williams, S.D.P., and Miguez, B.M. (2009). Rates of sea-level change over the past century in a geocentric reference frame. Geophys. Res. Lett.","DOI":"10.1029\/2009GL038720"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"W\u00f6ppelmann, G., and Marcos, M. (2012). Coastal sea level rise in southern Europe and the nonclimate contribution of vertical land motion. J. Geophys. Res. Ocean., 117.","DOI":"10.1029\/2011JC007469"},{"key":"ref_14","unstructured":"Brockmann, J.M., Schubert, T., Mayer-G\u00fcrr, T., and Schuh, W.-D. (2019). The Earth\u2019s Gravity Field as Seen by the GOCE Satellite\u2014An Improved Sixth Release Derived with the Time-Wise Approach, GFZ Data Services. Available online: https:\/\/dataservices.gfz-potsdam.de\/icgem\/showshort.php?id=escidoc:4315891."},{"key":"ref_15","unstructured":"F\u00f6rste, C., Abrykosov, O., Bruinsma, S., Dahle, C., K\u00f6nig, R., and Lemoine, J.-M. (2019). ESA\u2019s Release 6 GOCE Gravity Field Model by Means of the Direct Approach Based on Improved Filtering of the Reprocessed Gradients of the Entire Mission, GFZ Data Services. Available online: https:\/\/gfzpublic.gfz-potsdam.de\/pubman\/faces\/ViewItemFullPage.jsp?itemId=item_4495891_2&view=EXPORT."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Brooks, B.A., Merrifield, M.A., Foster, J., Werner, C.L., Gomez, F., Bevis, M., and Gill, S. (2007). Space geodetic determination of spatial variability in relative sea level change, Los Angeles basin. Geophys. Res. Lett., 34.","DOI":"10.1029\/2006GL028171"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"661","DOI":"10.1109\/TGRS.2010.2060264","article-title":"Imaging Geodesy\u2014Toward Centimeter-Level Ranging Accuracy with TerraSAR-X","volume":"49","author":"Eineder","year":"2011","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Balss, U., Gisinger, C., Cong, X.Y., Brcic, R., Steigenberger, P., Eineder, M., Pail, R., and Hugentobler, U. (2013, January 21\u201326). High resolution geodetic earth observation with TerraSAR-X: Correction schemes and validation. Proceedings of the 2013 IEEE International Geoscience and Remote Sensing Symposium\u2014IGARSS, Melbourne, Australia.","DOI":"10.1109\/IGARSS.2013.6723835"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1782","DOI":"10.1109\/TGRS.2014.2348859","article-title":"Precise Three-Dimensional Stereo Localization of Corner Reflectors and Persistent Scatterers With TerraSAR-X","volume":"53","author":"Gisinger","year":"2015","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Gisinger, C., Schubert, A., Breit, H., Garthwaite, M., Balss, U., Willberg, M., Small, D., Eineder, M., and Miranda, N. (2020). In-Depth Verification of Sentinel-1 and TerraSAR-X Geolocation Accuracy Using the Australian Corner Reflector Array. IEEE Trans. Geosci. Remote Sens., 1\u201328.","DOI":"10.1109\/TGRS.2019.2961248"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1869","DOI":"10.1109\/TGRS.2013.2255881","article-title":"On the Use of Transponders as Coherent Radar Targets for SAR Interferometry","volume":"52","author":"Mahapatra","year":"2014","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"53","DOI":"10.1007\/s00190-016-0937-2","article-title":"Differential geodetic stereo SAR with TerraSAR-X by exploiting small multi-directional radar reflectors","volume":"91","author":"Gisinger","year":"2017","journal-title":"J. Geod."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"857","DOI":"10.1007\/s00190-015-0819-z","article-title":"Second-degree Stokes coefficients from multi-satellite SLR","volume":"89","author":"Gerstl","year":"2015","journal-title":"J. Geod."},{"key":"ref_24","unstructured":"Poutanen, M., and Kakkuri, J. (1999). Final Results of the Baltic Sea Level 1997 GPS Campaign, Finnish Geodetic Institute. Reports."},{"key":"ref_25","unstructured":"Kakkuri, J. (1995). Final Results of the Baltic Sea Level 1993 Campaign, Finnish Geodetic Institute. Reports."},{"key":"ref_26","unstructured":"(2020, September 22). Sentinel High Level Operations Plan (HLOP)\u2014Sentinel 1 SAR Document Library\u2014User Guides\u2014Sentinel Online. Available online: https:\/\/sentinel.esa.int\/web\/sentinel\/user-guides\/sentinel-1-sar\/document-library\/-\/asset_publisher\/1dO7RF5fJMbd\/content\/sentinel-high-level-operations-plan."},{"key":"ref_27","unstructured":"di Meo, P., Pausini, M., Carnavale, G., Trampuz, C., and Meta, A. (2019). ECR-C User Manual, MetaSensing BV. Issue 1.6."},{"key":"ref_28","unstructured":"Cumming, I.G., and Wong, F.H. (2005). Digital Processing of Synthetic Aperture Radar Data, Artech House."},{"key":"ref_29","unstructured":"Piantanida, R., Recchia, A., Franceschi, N., Valentino, A., Miranda, N., Schubert, A., and Small, D. (2018, January 4\u20137). Accurate Geometric Calibration of Sentinel-1 Data. Proceedings of the EUSAR 2018\u201412th European Conference on Synthetic Aperture Radar, Aachen, Germany."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"349","DOI":"10.1007\/s00190-017-1066-2","article-title":"VMF3\/GPT3: Refined discrete and empirical troposphere mapping functions","volume":"92","author":"Landskron","year":"2018","journal-title":"J. Geod."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1387","DOI":"10.1007\/s00190-018-1127-1","article-title":"Refined discrete and empirical horizontal gradients in VLBI analysis","volume":"92","author":"Landskron","year":"2018","journal-title":"J. Geod."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"193","DOI":"10.1007\/s00190-007-0170-0","article-title":"Implementation and testing of the gridded Vienna Mapping Function 1 (VMF1)","volume":"82","author":"Kouba","year":"2008","journal-title":"J. Geod."},{"key":"ref_33","unstructured":"Schaer, S. (1999). Mapping and Predicting the Earth\u2019s Ionosphere Using the Global Positioning System. Institut f\u00fcr Geod\u00e4sie und Photogrammetrie Eidg, Technische Hochschule Z\u00fcrich."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"263","DOI":"10.1007\/s00190-008-0266-1","article-title":"The IGS VTEC maps: A reliable source of ionospheric information since 1998","volume":"83","author":"Juan","year":"2009","journal-title":"J. Geod."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Balss, U., Cong, X.Y., Brcic, R., Rexer, M., Minet, C., Breit, H., Eineder, M., and Fritz, T. (2012, January 22\u201327). High precision measurement on the absolute localization accuracy of TerraSAR-X. Proceedings of the 2012 IEEE International Geoscience and Remote Sensing Symposium, Munich, Germany.","DOI":"10.1109\/IGARSS.2012.6351217"},{"key":"ref_36","unstructured":"Petit, G., and Luzum, B. (2010). IERS\u2014IERS Conventions (2010), Verlag des Bundesamts f\u00fcr Kartographie und Geod\u00e4sie. IERS Technical Note No. 36."},{"key":"ref_37","unstructured":"Leberl, F.W. (1990). Radargrammetric Image Processing, Artech House."},{"key":"ref_38","unstructured":"Mikhail, E.M., and Ackermann, F.E. (1976). Observations and Least Squares, IEP."},{"key":"ref_39","doi-asserted-by":"crossref","unstructured":"Xu, G. (2013). Sciences of Geodesy\u2014II, Springer.","DOI":"10.1007\/978-3-642-28000-9"},{"key":"ref_40","unstructured":"Moritz, H. (1980). Advanced Physical Geodesy, Abacus Press."},{"key":"ref_41","unstructured":"Tscherning, C., and Rapp, R.H. (1974). Closed Covariance Expressions for Gravity Anomalies, Geoid Undulations, and Deflections of the Vertical Implied by Anomaly Degree Variance Models, Department of Geodetic Science at the Ohio State University. Report No. 208."},{"key":"ref_42","doi-asserted-by":"crossref","unstructured":"Sans\u00f2, F., and Sideris, M.G. (2013). Geoid Determination by 3D Least-Squares Collocation. Geoid Determination: Theory and Methods, Springer. Lecture Notes in Earth System Sciences.","DOI":"10.1007\/978-3-540-74700-0"},{"key":"ref_43","doi-asserted-by":"crossref","unstructured":"Forsberg, R. (1984). A Study of Terrain Reduction, Density, Anomalies and Geophysical Inversion Methods in Gravity Field Modeling, Department of Geodetic Science at the Ohio State University. Report No. 355.","DOI":"10.21236\/ADA150788"},{"key":"ref_44","first-page":"367","article-title":"Refined least squares modification of Stokes\u2019 formula","volume":"16","year":"1991","journal-title":"Manuscr. Geod."},{"key":"ref_45","doi-asserted-by":"crossref","unstructured":"Sj\u00f6berg, L.E., and Bagherbandi, M. (2017). Gravity Inversion and Integration\u2014Theory and Applications in Geodesy and Geophysics, Springer International Publishing.","DOI":"10.1007\/978-3-319-50298-4"},{"key":"ref_46","first-page":"143","article-title":"The new gravimetric quasigeoid model KTH08 over Sweden","volume":"3","author":"Kiamehr","year":"2009","journal-title":"J. Appl. Geod."},{"key":"ref_47","unstructured":"\u00c5gren, J., Strykowski, G., Bilker-Koivula, M., Omang, O.C., M\u00e4rdla, S., Forsberg, R., Ellmann, A., Oja, T., Liepin\u0161, I., and Par\u0161eli\u016bnas, E. (2016, January 19\u201323). The NKG2015 Gravimetric Geoid Model for the Nordic-Baltic Region. Proceedings of the 1st Joint Commission 2 and IGFS International Symposium on Gravity, Geoid and Height Systems, Thessaloniki, Greece."},{"key":"ref_48","doi-asserted-by":"crossref","unstructured":"Kvas, A., Brockmann, J.M., Krauss, S., Schubert, T., Gruber, T., Meyer, U., Mayer-G\u00fcrr, T., Schuh, W.-D., J\u00e4ggi, A., and Pail, R. (2020). GOCO06s\u2014A satellite-only global gravity field model. Earth Syst. Sci. Data Discuss., 1\u201331.","DOI":"10.5194\/essd-2020-192"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"128","DOI":"10.1007\/s001900050278","article-title":"Geodetic Reference System 1980 by H. Moritz","volume":"74","author":"Moritz","year":"2000","journal-title":"J. Geod."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"RG2004","DOI":"10.1029\/2005RG000183","article-title":"The Shuttle Radar Topography Mission","volume":"45","author":"Farr","year":"2007","journal-title":"Rev. Geophys."},{"key":"ref_51","unstructured":"(2020, November 13). Earth Resources Observation and Science (EROS) Center, Global 30 Arc-Second Elevation (GTOPO30), Available online: https:\/\/www.usgs.gov\/centers\/eros\/science\/usgs-eros-archive-digital-elevation-global-30-arc-second-elevation-gtopo30?qt-science_center_objects=0#qt-science_center_objects."},{"key":"ref_52","doi-asserted-by":"crossref","unstructured":"Heiskanen, W.A., and Moritz, H. (1967). Physical Geodesy, W.H. Freeman & Co. Ltd.","DOI":"10.1007\/BF02525647"},{"key":"ref_53","unstructured":"Barthelmes, F. (2009). Definition of Functionals of the Geopotential and Their Calculation from Spherical Harmonic Models: Theory and Formulas Used by the Calculation Service of the International Centre for Global Earth Models (ICGEM), Available online: http:\/\/icgem.gfz-potsdam.de."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"416","DOI":"10.1080\/01490419.2017.1326428","article-title":"From Discrete Gravity Survey Data to a High-resolution Gravity Field Representation in the Nordic-Baltic Region","volume":"40","author":"Strykowski","year":"2017","journal-title":"Mar. Geod."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"1759","DOI":"10.1007\/s00190-019-01280-8","article-title":"NKG2016LU: A new land uplift model for Fennoscandia and the Baltic Region","volume":"93","author":"Steffen","year":"2019","journal-title":"J. Geod."},{"key":"ref_56","unstructured":"Dahle, C., Flechtner, F., Murb\u00f6ck, M., Michalak, G., Neumayer, K.H., Abrykosov, O., Reinhold, A., and K\u00f6nig, R. (2020, November 13). GRACE-FO Geopotential GSM Coefficients GFZ RL06. Available online: https:\/\/gfzpublic.gfz-potsdam.de\/pubman\/faces\/ViewItemFullPage.jsp?itemId=item_4330890_1."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"138","DOI":"10.1080\/01490419.2013.771594","article-title":"Precise Hydrodynamic Leveling by Using Pressure Gauges","volume":"36","author":"Liibusk","year":"2013","journal-title":"Mar. Geod."},{"key":"ref_58","first-page":"27","article-title":"Geodetic Reconciliation of Tide Gauge Network in Estonia","volume":"54","author":"Kollo","year":"2019","journal-title":"Geophysica"},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"907","DOI":"10.1007\/s00190-016-0948-z","article-title":"The Geodesist\u2019s Handbook 2016","volume":"90","author":"Drewes","year":"2016","journal-title":"J. Geod."},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"45","DOI":"10.1007\/s00190-013-0668-6","article-title":"Non-linear station motions in epoch and multi-year reference frames","volume":"88","author":"Seitz","year":"2014","journal-title":"J. Geod."},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"6109","DOI":"10.1002\/2016JB013098","article-title":"ITRF2014: A new release of the International Terrestrial Reference Frame modeling nonlinear station motions","volume":"121","author":"Altamimi","year":"2016","journal-title":"J. Geophys. Res. Solid Earth"},{"key":"ref_62","unstructured":"Seitz, M., Blo\u00dffeld, M., Angermann, D., Schmid, R., Gerstl, M., and Seitz, F. (2016). The New DGFI-TUM Realization of the ITRS: DTRF2014 (Data), Deutsches Geod\u00e4tisches Forschungsinstitut."},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"8474","DOI":"10.1002\/2017JB014360","article-title":"JTRF2014, the JPL Kalman filter and smoother realization of the International Terrestrial Reference System","volume":"122","author":"Abbondanza","year":"2017","journal-title":"J. Geophys. Res. 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