{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,11]],"date-time":"2026-04-11T20:29:02Z","timestamp":1775939342195,"version":"3.50.1"},"reference-count":79,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2014,5,30]],"date-time":"2014-05-30T00:00:00Z","timestamp":1401408000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Originally designed for applications over the ocean, satellite altimetry has been proven to be a useful tool for hydrologic studies. Altimeter products, mainly conceived for oceanographic studies, often fail to provide atmospheric corrections suitable for inland water studies. The focus of this paper is the analysis of the main issues related with the atmospheric corrections that need to be applied to the altimeter range to get precise water level heights. Using the corrections provided on the Radar Altimeter Database System, the main errors present in the dry and wet tropospheric corrections and in the ionospheric correction of the various satellites are reported. It has been shown that the model-based tropospheric corrections are not modeled properly and in a consistent way in the various altimetric products. While over the ocean, the dry tropospheric correction (DTC) is one of the most precise range corrections, in some of the present altimeter products, it is the correction with the largest errors over continental water regions, causing large biases of several decimeters, and along-track interpolation errors up to several centimeters, both with small temporal variations. The wet tropospheric correction (WTC) from the on-board microwave radiometers is hampered by the contamination on the radiometer measurements of the surrounding lands, making it usable only in the central parts of large lakes. In addition, the WTC from atmospheric models may also have large errors when it is provided at sea level instead of surface height. These errors cannot be corrected by the user, since no accurate expression exists for the height variation of the WTC. Alternative and accurate corrections can be computed from in situ data, e.g., DTC from surface pressure at barometric stations and WTC from Global Navigation Satellite System permanent stations. The latter approach is particularly favorable for small lakes and reservoirs, where GNSS-derived WTC at a single location can be representative of the whole lake. For non-timely critical studies, for consistency and stability, model-derived tropospheric corrections from European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis ERA Interim, properly computed at surface height, are recommended. The instrument-based dual-frequency ionospheric correction may have errors related with the land contamination in the Ku and C\/S bands, making it more suitable to use a model-based correction. The most suitable model-based ionospheric correction is the Jet Propulsion Laboratory (JPL) global ionosphere map (GIM) model, available after 1998, properly scaled to the altimeter height. Most altimeter products provide the GIM correction unreduced for the total electron content extending above the altitude of these satellites, thus overestimating the ionospheric correction by about 8%. Prior to 1998, the NIC09 (NOAA Ionosphere Climatology 2009) climatology provides the best accuracy.<\/jats:p>","DOI":"10.3390\/rs6064952","type":"journal-article","created":{"date-parts":[[2014,5,30]],"date-time":"2014-05-30T12:00:34Z","timestamp":1401451234000},"page":"4952-4997","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":89,"title":["Atmospheric Corrections for Altimetry Studies over  Inland Water"],"prefix":"10.3390","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0946-0092","authenticated-orcid":false,"given":"M.","family":"Fernandes","sequence":"first","affiliation":[{"name":"Faculdade de Ci\u00eancias, Universidade do Porto, 4169-007 Porto, Portugal"},{"name":"Centro Interdisciplinar de Investiga\u00e7\u00e3o Marinha e Ambiental (CIIMAR\/CIMAR), Universidade do Porto, 4050-123 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8849-7546","authenticated-orcid":false,"given":"Clara","family":"L\u00e1zaro","sequence":"additional","affiliation":[{"name":"Faculdade de Ci\u00eancias, Universidade do Porto, 4169-007 Porto, Portugal"},{"name":"Centro Interdisciplinar de Investiga\u00e7\u00e3o Marinha e Ambiental (CIIMAR\/CIMAR), Universidade do Porto, 4050-123 Porto, Portugal"}]},{"given":"Alexandra","family":"Nunes","sequence":"additional","affiliation":[{"name":"Centro Interdisciplinar de Investiga\u00e7\u00e3o Marinha e Ambiental (CIIMAR\/CIMAR), Universidade do Porto, 4050-123 Porto, Portugal"},{"name":"Instituto Polit\u00e9cnico do Porto, Instituto Superior de Engenharia, 4200-072 Porto, Portugal"}]},{"given":"Remko","family":"Scharroo","sequence":"additional","affiliation":[{"name":"European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT),  64295 Darmstadt, Germany"}]}],"member":"1968","published-online":{"date-parts":[[2014,5,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"25179","DOI":"10.1029\/95JC02125","article-title":"The contribution of TOPEX\/POSEIDON to the global monitoring of climatically sensitive lakes","volume":"100","author":"Birkett","year":"1995","journal-title":"J. Geophys. Res.: Oceans"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"881","DOI":"10.1029\/97GL00809","article-title":"Caspian sea level from TOPEX-POSEIDON altimetry: Level now falling","volume":"24","author":"Cazenave","year":"1997","journal-title":"Geophys. Res. Lett"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1113","DOI":"10.1016\/j.crte.2006.05.012","article-title":"Continental surface waters from satellite altimetry","volume":"338","author":"Calmant","year":"2006","journal-title":"C. R. Geosci"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1098","DOI":"10.1016\/j.crte.2006.08.002","article-title":"Lake studies from satellite radar altimetry","volume":"338","author":"Cretaux","year":"2006","journal-title":"C. R. Geosci"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"723","DOI":"10.1007\/s00190-008-0289-7","article-title":"An absolute calibration site for radar altimeters in the continental domain: Lake Issykkul in Central Asia","volume":"83","author":"Cretaux","year":"2009","journal-title":"J. Geodesy"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"291","DOI":"10.1080\/01490419.2011.585110","article-title":"Absolute calibration of Jason radar altimeters from GPS kinematic campaigns over Lake Issykkul","volume":"34","author":"Cretaux","year":"2011","journal-title":"Mar. Geod"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1523","DOI":"10.1016\/j.asr.2012.06.039","article-title":"Calibration of Envisat radar altimeter over Lake Issykkul","volume":"51","author":"Cretaux","year":"2013","journal-title":"Adv. Space Res"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"520","DOI":"10.1016\/S0380-1330(05)70281-1","article-title":"Evolution of sea level of the big Aral Sea from satellite altimetry and its implications for water balance","volume":"31","author":"Cretaux","year":"2005","journal-title":"J. Gt. Lakes Res"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Coe, M.T., and Birkett, C.M. (2004). Calculation of river discharge and prediction of lake height from satellite radar altimetry: Example for the Lake Chad basin. Water Resour. Res.","DOI":"10.1029\/2003WR002543"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"858","DOI":"10.1016\/j.asr.2012.10.001","article-title":"A point-wise least squares spectral analysis (LSSA) of the Caspian Sea level fluctuations, using TOPEX\/Poseidon and Jason-1 observations","volume":"51","author":"Sharifi","year":"2013","journal-title":"Adv. Space Res"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"375","DOI":"10.1002\/env.709","article-title":"Modern hydro-biological state of the Small Aral sea","volume":"16","author":"Aladin","year":"2005","journal-title":"Environmetrics"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"141","DOI":"10.1016\/S0921-8181(01)00139-4","article-title":"Interannual lake level fluctuations 1993\u20131999 in Africa from Topex\/Poseidon: Connections with ocean-atmosphere interactions over the Indian Ocean","volume":"32","author":"Mercier","year":"2002","journal-title":"Glob. Planet. Chang"},{"key":"ref_13","first-page":"1","article-title":"Satellite Altimetry","volume":"69","author":"Fu","year":"2001","journal-title":"Satellite Altimetry and Earth Sciences: A Handbook of Techniques and Applications"},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Vignudelli, S., Kostianoy, A.G., Cipollini, P., and Benveniste, J. (2011). Coastal Altimetry, Springer-Verlag.","DOI":"10.1007\/978-3-642-12796-0"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Vignudelli, S., Kostianoy, A.G., Cipollini, P., and Benveniste, J. (2011). Coastal Altimetry, Springer-Verlag.","DOI":"10.1007\/978-3-642-12796-0"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"204","DOI":"10.1080\/01490419.2010.488983","article-title":"Investigating the performance of the Jason-2\/OSTM radar altimeter over lakes and reservoirs","volume":"33","author":"Birkett","year":"2010","journal-title":"Mar. Geod"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"609","DOI":"10.1109\/JSTARS.2013.2291516","article-title":"Numerical simulation and forecasting of water level for Qinghai Lake using multi-altimeter data between 2002 and 2012","volume":"7","author":"Liao","year":"2014","journal-title":"IEEE J. Sel. Top. Appl. Earth Observ. Remote Sens"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Gao, L., Liao, J.J., and Shen, G.Z. (2013). Monitoring lake-level changes in the Qinghai-Tibetan Plateau using radar altimeter data 2002\u20132012. J. Appl. Remote Sens.","DOI":"10.1117\/1.JRS.7.073470"},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Vignudelli, S., Kostianoy, A.G., Cipollini, P., and Benveniste, J. (2011). Coastal Altimetry, Springer-Verlag.","DOI":"10.1007\/978-3-642-12796-0"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"3913","DOI":"10.1080\/01431161.2010.483495","article-title":"Application of retracked satellite altimetry for inland hydrologic studies","volume":"31","author":"Zhang","year":"2010","journal-title":"Int. J. Remote Sens"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"335","DOI":"10.1080\/714044525","article-title":"Calibration of JASON-1 altimeter over Lake Erie","volume":"26","author":"Shum","year":"2003","journal-title":"Mar. Geod"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"184","DOI":"10.1134\/S009780781202008X","article-title":"Satellite altimetry of inland water bodies","volume":"39","author":"Troitskaya","year":"2012","journal-title":"Water Resour"},{"key":"ref_23","unstructured":"Benveniste, J., and M\u00e9nard, Y. (2006, January 13\u201318). Two Decades of Inland Water Monitoring Using Satellite Radar Altimetry. Venice, Italy."},{"key":"ref_24","unstructured":"Berry, P.A.M., and Wheeler, J.L. Available on line: http:\/\/tethys.eaprs.cse.dmu.ac.uk\/RiverLake\/info\/documents."},{"key":"ref_25","unstructured":"Mercier, F. (2003, January 6\u201311). Satellite Altimetry over Non-Ocean Areas: An Improved Wet Tropospheric Correction from Meteorological Models. Nice, France."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1497","DOI":"10.1016\/j.asr.2011.01.004","article-title":"SOLS: A lake database to monitor in the Near Real Time water level and storage variations from remote sensing data","volume":"47","author":"Cretaux","year":"2011","journal-title":"Adv. Space Res"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1205","DOI":"10.1016\/S1364-6826(99)00067-X","article-title":"Automated daily process for global ionospheric total electron content maps and satellite ocean altimeter ionospheric calibration based on Global Positioning System data","volume":"61","author":"Iijima","year":"1999","journal-title":"J. Atmos. Sol.: Terr. Phys"},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Scharroo, R., and Smith, W.H.F. (2010). A global positioning system-based climatology for the total electron content in the ionosphere. J. Geophys. Res.: Space Phys.","DOI":"10.1029\/2009JA014719"},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Bent, R.B. (1992). Bent ionospheric model 1972. Planet. Space Sci.","DOI":"10.1016\/0032-0633(92)90176-O"},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Llewellyn, S.K., and Bent, R.B. (1973). Documentation and Description of the Bent Ionospheric Model, Air Force Cambridge Research Laboratory, Hanscom Air Force Base.","DOI":"10.21236\/AD0772733"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"9363","DOI":"10.1029\/JB090iB11p09363","article-title":"Deformation induced by polar motion","volume":"90","author":"Wahr","year":"1985","journal-title":"J. Geophys. Res.: Solid Earth Planets"},{"key":"ref_32","unstructured":"Scharroo, R., Leuliette, E.W., Lillibridge, J.L., Byrne, D., Naeije, M.C., and Mitchum, G.T. (2012, January 20\u201328). RADS: Consistent Multi-Mission Products. Venice, Italy."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"1593","DOI":"10.1029\/RS020i006p01593","article-title":"Geodesy by Radio Interferometry\u2014Effects of atmospheric modeling errors on estimates of baseline length","volume":"20","author":"Davis","year":"1985","journal-title":"Radio Sci"},{"key":"ref_34","first-page":"10","article-title":"Increased resolution in the ECMWF deterministic and ensemble prediction systems","volume":"124","author":"Miller","year":"2010","journal-title":"ECMWF Newslett"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"581","DOI":"10.1175\/1520-0434(1997)012<0581:CTTNOM>2.0.CO;2","article-title":"Changes to the 1995 NCEP operational medium-range forecast model analysis-forecast system","volume":"12","author":"Caplan","year":"1997","journal-title":"Weather Forecast"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"553","DOI":"10.1002\/qj.828","article-title":"The ERA-Interim reanalysis: Configuration and performance of the data assimilation system","volume":"137","author":"Dee","year":"2011","journal-title":"Q. J. R. Meteorol. Soc"},{"key":"ref_37","unstructured":"(1976). U.S. Standard Atmosphere, NOAA\/NASA\/USAF."},{"key":"ref_38","unstructured":"Berg, H. (1948). Allgemeine Meteorologie: Einf\u00fchrung in die Physik der Atmosph\u00e4re, F. D\u00fcmmler."},{"key":"ref_39","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. Geodesy"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"4487","DOI":"10.1029\/JC074i018p04487","article-title":"Two-quartic tropospheric refractivity profile for correcting satellite data","volume":"74","author":"Hopfield","year":"1969","journal-title":"J. Geophys. Res"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"679","DOI":"10.1007\/s00190-007-0135-3","article-title":"Short note: A global model of pressure and temperature for geodetic applications","volume":"81","author":"Boehm","year":"2007","journal-title":"J. Geodesy"},{"key":"ref_42","doi-asserted-by":"crossref","unstructured":"Salstein, D.A., Ponte, R.M., and Cady-Pereira, K. (2008). Uncertainties in atmospheric surface pressure fields from global analyses. J. Geophys. Res.: Atmos.","DOI":"10.1029\/2007JD009531"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"1352","DOI":"10.1016\/j.asr.2012.04.025","article-title":"Tropospheric Delays from GNSS for Application in Coastal Altimetry","volume":"51","author":"Fernandes","year":"2013","journal-title":"Adv. Space Res"},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"22013","DOI":"10.1029\/97JD01571","article-title":"A temporal interpolation method to obtain hourly atmospheric surface pressure tides in Reanalysis 1979\u20131995","volume":"102","author":"Saha","year":"1997","journal-title":"J. Geophys. Res.: Atmos"},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"1897","DOI":"10.5194\/angeo-21-1897-2003","article-title":"Barometric tides from ECMWF operational analyses","volume":"21","author":"Ray","year":"2003","journal-title":"Ann. Geophys"},{"key":"ref_46","doi-asserted-by":"crossref","unstructured":"Ponte, R.M., and Ray, R.D. (2002). Atmospheric pressure corrections in geodesy and oceanography: A strategy for handling air tides. Geophys. Res. Lett.","DOI":"10.1029\/2002GL016340"},{"key":"ref_47","doi-asserted-by":"crossref","unstructured":"Andersen, O.B., and Knudsen, P. (2009). DNSC08 mean sea surface and mean dynamic topography models. J. Geophys. Res.: Oceans.","DOI":"10.1029\/2008JC005179"},{"key":"ref_48","doi-asserted-by":"crossref","unstructured":"Pavlis, N.K., Holmes, S.A., Kenyon, S.C., and Factor, J.K. (2012). The development and evaluation of the Earth Gravitational Model 2008 (EGM2008). J. Geophys. Res.: Solid Earth.","DOI":"10.1029\/2011JB008916"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"279","DOI":"10.1080\/01490410490465265","article-title":"Cross-calibration and long-term monitoring of the microwave radiometers of ERS, TOPEX, GFO, Jason, and Envisat","volume":"27","author":"Scharroo","year":"2004","journal-title":"Mar. Geod"},{"key":"ref_50","unstructured":"Eymard, L., and Obligis, E. (2006, January 13\u201318). The Altimetric Wet Troposheric Correction Progress since the ERS-1 Mission. Venice, Italy."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"1806","DOI":"10.1109\/TGRS.2008.2010130","article-title":"Cloud and rain effects on AltiKa\/SARAL Ka-band radar Altimeter\u2014Part I: Modeling and mean annual data availability","volume":"47","author":"Tournadre","year":"2009","journal-title":"IEEE Trans. Geosci. Remote Sens"},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"3211","DOI":"10.1109\/TGRS.2011.2104967","article-title":"Using objective analysis of scanning radiometer measurements to compute the water vapor path delay for Altimetry","volume":"49","author":"Stum","year":"2011","journal-title":"IEEE Trans. Geosci. Remote Sens"},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"2139","DOI":"10.1109\/TGRS.2006.888967","article-title":"On the wet tropospheric correction for altimetry in coastal regions","volume":"45","author":"Desportes","year":"2007","journal-title":"IEEE Trans. Geosci. Remote Sens"},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"1986","DOI":"10.1109\/TGRS.2009.2037220","article-title":"Novel Near-Land Radiometer Wet Path-Delay Retrieval algorithm: Application to the Jason-2\/OSTM advanced microwave radiometer","volume":"48","author":"Brown","year":"2010","journal-title":"IEEE Trans. Geosci. Remote Sens"},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"596","DOI":"10.1109\/LGRS.2010.2042425","article-title":"GNSS-derived path delay: An approach to compute the wet tropospheric correction for coastal altimetry","volume":"7","author":"Fernandes","year":"2010","journal-title":"IEEE Geosci. Remote Sens. Lett"},{"key":"ref_56","doi-asserted-by":"crossref","unstructured":"Vignudelli, S., Kostianoy, A.G., Cipollini, P., and Benveniste, J. (2011). Coastal Altimetry, Springer-Verlag.","DOI":"10.1007\/978-3-642-12796-0"},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"4977","DOI":"10.3390\/rs5104977","article-title":"Analysis and inter-calibration of wet path delay datasets to compute the wet tropospheric correction for CryoSat-2 over ocean","volume":"5","author":"Fernandes","year":"2013","journal-title":"Remote Sens"},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"15787","DOI":"10.1029\/92JD01517","article-title":"GPS meteorology\u2014Remote-sensing of atmospheric water-vapor using the global positioning system","volume":"97","author":"Bevis","year":"1992","journal-title":"J. Geophys. Res.: Atmos"},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"379","DOI":"10.1175\/1520-0450(1994)033<0379:GMMZWD>2.0.CO;2","article-title":"GPS meteorology\u2014Mapping zenith wet delays onto precipitable water","volume":"33","author":"Bevis","year":"1994","journal-title":"J. Appl. Meteorol"},{"key":"ref_60","unstructured":"Mendes, V.B., Prates, G., Santos, L., and Langley, R.B. (2000, January 26\u201328). An Evaluation of the Accuracy of Models of the Determination of the Weighted Mean Temperature of the Atmosphere. Anaheim, CA, USA."},{"key":"ref_61","unstructured":"Mendes, V.B. (1999). Modeling the Neutral-Atmosphere Propagation Delay in Radiometric Space Techniques. [Ph.D. Thesis, University of New Brunswick]."},{"key":"ref_62","unstructured":"Benveniste, J., and M\u00e9nard, Y. (2006, January 13\u201318). Improvement of the Topex\/Poseidon Altimetric Data Processing for Hydrological Purposes (Cash Project). Venice, Italy."},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"1163","DOI":"10.1109\/TAP.1986.1143951","article-title":"Ionospheric radio propagation models and predictions\u2014A minireview","volume":"34","author":"Rush","year":"1986","journal-title":"IEEE Trans. Antennas Propag"},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"271","DOI":"10.1109\/36.563266","article-title":"Correction of single frequency altimeter measurements for ionosphere delay","volume":"35","author":"Schreiner","year":"1997","journal-title":"IEEE Trans. Geosci. Remote Sens"},{"key":"ref_65","doi-asserted-by":"crossref","first-page":"24895","DOI":"10.1029\/94JC01869","article-title":"Evaluation of the topex\/poseidon dual-frequency ionosphere correction","volume":"99","author":"Imel","year":"1994","journal-title":"J. Geophys. Res.: Oceans"},{"key":"ref_66","unstructured":"Bilitza, D. (1990). International Reference Ionosphere 1990, National Space Science Data Center."},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"261","DOI":"10.1029\/2000RS002432","article-title":"International reference ionosphere 2000","volume":"36","author":"Bilitza","year":"2001","journal-title":"Radio Sci"},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"599","DOI":"10.1016\/j.asr.2007.07.048","article-title":"International reference ionosphere 2007: Improvements and new parameters","volume":"42","author":"Bilitza","year":"2008","journal-title":"Adv. Space Res"},{"key":"ref_69","first-page":"949","article-title":"Combining GPS Measurements and IRI Model Values for Space Weather Specification","volume":"29","author":"Rawer","year":"2002","journal-title":"Modelling the Topside Ionosphere and Plasmasphere"},{"key":"ref_70","doi-asserted-by":"crossref","unstructured":"Komjathy, A., Sparks, L., Wilson, B.D., and Mannucci, A.J. (2005). Automated daily processing of more than 1000 ground-based GPS receivers for studying intense ionospheric storms. Radio Sci.","DOI":"10.1029\/2005RS003279"},{"key":"ref_71","doi-asserted-by":"crossref","first-page":"565","DOI":"10.1029\/97RS02707","article-title":"A global mapping technique for GPS-derived ionospheric total electron content measurements","volume":"33","author":"Mannucci","year":"1998","journal-title":"Radio Sci"},{"key":"ref_72","first-page":"1751","article-title":"International Reference Ionosphere\u2014Status 1995\/96","volume":"20","author":"Rawer","year":"1997","journal-title":"Quantitative Description of Ionospheric Storm Effects and Irregularities"},{"key":"ref_73","unstructured":"Mercier, F., Rosmorduc, V., Carr\u00e8re, L., and Thibaut, P. Available online: http:\/\/www.aviso.altimetry.fr\/fileadmin\/documents\/data\/tools\/hdbk_Pistach.pdf."},{"key":"ref_74","doi-asserted-by":"crossref","unstructured":"Birkett, C.M., Mertes, L.A.K., Dunne, T., Costa, M.H., and Jasinski, M.J. (2002). Surface water dynamics in the Amazon Basin: Application of satellite radar altimetry. J. Geophys. Res.: Atmos.","DOI":"10.1029\/2001JD000609"},{"key":"ref_75","doi-asserted-by":"crossref","first-page":"150","DOI":"10.1016\/j.rse.2004.11.018","article-title":"ENVISAT radar altimeter measurements over continental surfaces and ice caps using the ICE-2 retracking algorithm","volume":"95","author":"Legresy","year":"2005","journal-title":"Remote Sens. Environ"},{"key":"ref_76","doi-asserted-by":"crossref","first-page":"252","DOI":"10.1016\/j.rse.2005.10.027","article-title":"Preliminary results of ENVISAT RA-2-derived water levels validation over the Amazon basin","volume":"100","author":"Frappart","year":"2006","journal-title":"Remote Sens. Environ"},{"key":"ref_77","doi-asserted-by":"crossref","first-page":"247","DOI":"10.1007\/s10712-008-9051-1","article-title":"Monitoring continental surface waters by satellite altimetry","volume":"29","author":"Calmant","year":"2008","journal-title":"Surv. Geophys"},{"key":"ref_78","unstructured":"Crespon, F., Jeansou, E., Helbert, J., Moreaux, G., Lognonn\u00e9, P., Godet, P.E., and Garci, R. (2007, January 1\u20134). SPECTRE (www.noveltis.fr\/spectre): A Web Service for Ionospheric Products. Toulouse, France."},{"key":"ref_79","unstructured":"Francis, C.R. (2007). CryoSat Mission and Data Description, ESTEC. CS-RP-ESA-SY-0059."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/6\/6\/4952\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T21:11:59Z","timestamp":1760217119000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/6\/6\/4952"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2014,5,30]]},"references-count":79,"journal-issue":{"issue":"6","published-online":{"date-parts":[[2014,6]]}},"alternative-id":["rs6064952"],"URL":"https:\/\/doi.org\/10.3390\/rs6064952","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2014,5,30]]}}}