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An effective toolkit for the interpolation and gross error detection of GPS time series / X. Wang in Survey review, vol 48 n° 348 (May 2016)  

Public [article]  inSurvey review > vol 48 n° 348 (May 2016) . - pp 202 - 211 Titre : An effective toolkit for the interpolation and gross error detection of GPS time series Type de document : Article/Communication Auteurs : X. Wang, Auteur ; Y. Cheng, Auteur ; S. Wu, Auteur ; K. Zhang, Auteur Année de publication : 2016 Article en page(s) : pp 202 - 211 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse de spectre singulier [Termes IGN] coordonnées GPS [Termes IGN] détection d'erreur [Termes IGN] interpolation [Termes IGN] modèle de simulation [Termes IGN] série temporelle [Vedettes matières IGN] Traitement de données GNSS Résumé : (auteur) As data gaps and gross errors inevitably exist in GPS time series, robust detection and interpolation procedures are needed to obtain a uniform time series for various geospatial studies and applications. The use of traditional methods for this purpose is usually based on some improper assumptions, which are not derived based on the real properties of the data. Moreover, different interpolation methods may need to be investigated for interpolation for various gaps with different types and amount of missing data. These make the interpolation for missing data not easy. To address the issue of mentioned above, in this study, a data-analysis method named singular spectrum analysis (SSA) for missing data is assessed for reconstructing a reliable model from unevenly sampled time series without the need for any a priori knowledge of the time series data. In this method, the interpolation and detection of gross errors are carried out in one go along with the reliable reconstructed model. Both simulation data and real GPS data testing results showed that this was an efficient method for interpolation and gross error detection. Numéro de notice : A2016-276 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1179/1752270615Y.0000000023 En ligne : http://doi.org/10.1179/1752270615Y.0000000023 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80830 [article]

The effect of E-M wave's attenuation on sea surface reflectivity, emissivity and estimation of sea surface temperature / Q. Xu in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 5 (August 2006)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 60 n° 5 (August 2006) . - pp 295 - 305 Titre : The effect of E-M wave's attenuation on sea surface reflectivity, emissivity and estimation of sea surface temperature Type de document : Article/Communication Auteurs : Q. Xu, Auteur ; Y. Liu, Auteur ; Y. Cheng, Auteur Année de publication : 2006 Article en page(s) : pp 295 - 305 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Télédétection [Termes IGN] emissivité [Termes IGN] océanographie spatiale [Termes IGN] onde électromagnétique [Termes IGN] réflectivité [Termes IGN] surface de la mer [Termes IGN] télédétection en hyperfréquence [Termes IGN] température de surface de la mer Résumé : (Auteur) The imaginary component of the complex index of refraction denotes the attenuation of E-M waves in amplitude within the procedure of propagation in a medium. The attenuation of E-M waves in sea water is of great importance in microwave remote sensing, because the Snell's law of refraction in air–sea interface, sea surface reflectivity, sea surface emissivity and the estimation of sea surface temperature (SST) from microwave radiometer detections are all related to it. The well-known expressions of the reflectivity were derived in optics, but they cannot be applied directly to microwave remote sensing, since the E-M waves of microwave bands propagating in the sea water are greatly attenuated. In this study, a more appropriate formula of the reflectivity is proposed for the full range of E-M waves with considering the attenuation of E-M waves in the sea water. The proposed formula can be used to obtain the emissivity of sea surface, which is useful to estimate SST in microwave remote sensing. The error analysis indicates further that the proposed formula of the reflectivity is significant for improving ocean microwave remote sensing and increasing the retrieval accuracy of SST. Copyright ISPRS Numéro de notice : A2006-370 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.04.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.04.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28094 [article]

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