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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]

Analysis of the repeated absolute gravity measurements in the Czech Republic, Slovakia and Hungary from the period 1991–2010 considering instrumental and hydrological effects / S. Zhang in Journal of geodesy, vol 87 n° 1 (January 2013)  

Public [article]  inJournal of geodesy > vol 87 n° 1 (January 2013) . - pp 29 - 42 Titre : Analysis of the repeated absolute gravity measurements in the Czech Republic, Slovakia and Hungary from the period 1991–2010 considering instrumental and hydrological effects Type de document : Article/Communication Auteurs : S. Zhang, Auteur ; X. Tong, Auteur ; K. Zhang, Auteur Année de publication : 2013 Article en page(s) : pp 29 - 42 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] analyse diachronique [Termes IGN] erreur instrumentale [Termes IGN] gravimètre absolu [Termes IGN] Hongrie [Termes IGN] hydrologie [Termes IGN] levé gravimétrique [Termes IGN] République Tchèque [Termes IGN] Slovaquie Résumé : (Auteur) Since August 2001, the absolute gravimeter FG5#215 has been used for the modernization of the national gravity networks of the Czech Republic, Slovakia, and Hungary. Altogether 43 absolute stations were measured, some of them repeatedly. Absolute gravity at 29 stations had already been determined in 1990s by other absolute gravimeters (FG5 or JILAg). Differences of repeated measurements at most of the stations show an unexpected decrease of gravity (up to 22 uGal) over the whole region. An uncertainty assessment of absolute measurements with a special emphasis put on hydrological effects shows a statistical significance of the detected gravity variations at many stations. In this manuscript, three possible reasons of such findings are discussed: (1) a regional geodynamic activity, (2) systematic instrumental errors (offsets), (3) hydrological effects. The analysis and statistics of the gravity differences in context of international comparisons of absolute gravimeters show offsets up to 9 uGal related to data of the JILAg-6 and FG5#107 gravimeters. Data collected in this study demonstrate that considering instrumental and hydrological effects on gravity are crucial for a correct interpretation of repeated absolute gravity measurements. Numéro de notice : A2013-072 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0576-1 Date de publication en ligne : 24/06/2012 En ligne : https://doi.org/10.1007/s00190-012-0576-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32210 [article]

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266-2013011	SL	Revue	Centre de documentation	Revues en salle	Disponible

Ionospheric response to the geomagnetic storm on august 21, 2003 over China using GNSS-based tomographic technique / D. Wen in IEEE Transactions on geoscience and remote sensing, vol 48 n° 8 (August 2010)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 48 n° 8 (August 2010) . - pp 3212 - 3217 Titre : Ionospheric response to the geomagnetic storm on august 21, 2003 over China using GNSS-based tomographic technique Type de document : Article/Communication Auteurs : D. Wen, Auteur ; Y. Yuan, Auteur ; J. Ou, Auteur ; K. Zhang, Auteur Année de publication : 2010 Article en page(s) : pp 3212 - 3217 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] Chine [Termes IGN] ionosphère [Termes IGN] perturbation ionosphérique [Termes IGN] positionnement par GNSS [Termes IGN] tempête magnétique [Termes IGN] tomographie Résumé : (Auteur) The impacts of the August 21, 2003 geomagnetic storm on the ionosphere over China have been first investigated by using the so-called computerized ionospheric tomography (CIT) technique and the observations of the Crustal Movement Observation Network of China. Tomographic results show that the main ionospheric effects of this geomagnetic storm over China are as follows: (1) the negative storm phase effect appears in the F region and (2) the positive storm phase effect occurs above the F region. Meanwhile, some key features in the ionospheric structure have been revealed in the ionospheric images during the storm; this includes the disturbances and an elongated region of the reduced electron density at the latitude around 32°N. Statistical comparisons are carried out to confirm the reliability of the global-navigation-satellite-system-based CIT reconstruction results using the profile obtained from ionosonde observations. Numéro de notice : A2010-309 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2010.2044579 En ligne : https://doi.org/10.1109/TGRS.2010.2044579 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30503 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
065-2010081	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Multi-path PALSAR interferometric observations of the 2008 magnitude 8.0 Wenchuan earthquake / K. Zhang in International Journal of Remote Sensing IJRS, vol 31 n° 13 (July /2010)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 31 n° 13 (July /2010) . - pp 3449 - 3463 Titre : Multi-path PALSAR interferometric observations of the 2008 magnitude 8.0 Wenchuan earthquake Type de document : Article/Communication Auteurs : K. Zhang, Auteur ; A. Ng, Auteur ; Linlin Ge, Auteur Année de publication : 2010 Article en page(s) : pp 3449 - 3463 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] bande L [Termes IGN] déformation de surface [Termes IGN] fusion d'images [Termes IGN] image ALOS-PALSAR [Termes IGN] image radar moirée [Termes IGN] interferométrie différentielle [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] séisme [Termes IGN] Setchouan (Chine) [Termes IGN] superposition d'images Résumé : (Auteur) The Satellite Differential Interferometric Synthetic Aperture Radar (DInSAR) has already demonstrated its potential to map co-, post- and inter-seismic deformation. This paper presents analysis of the surface-displacement field of the 12 May 2008 magnitude 8.0 Wenchuan Earthquake using the Advanced Land Observing Satellite (ALOS) Phased Array type L-band Synthetic Aperture Radar (PALSAR) DInSAR. Six PALSAR interferograms of paths 471 to 476 are generated. A new approach, which uses the information of overlapping interferograms, has been developed to compensate for orbit error. The main advantage of this approach is that the calculation is performed without the need for phase unwrapping. Once the orbit error has been compensated for, the interferograms are then merged to form a single interferogram. The final mosaic of interferograms demonstrates a much more consistent co-seismic surface-displacement field than the original interferograms. Numéro de notice : A2010-350 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431161.2010.514752 En ligne : https://doi.org/10.1080/01431161.2010.514752 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30544 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-2010081	RAB	Revue	Centre de documentation	En réserve L003	Exclu du prêt

Comparison of three algorithms for filtering airborne lidar data / K. Zhang in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 3 (March 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 3 (March 2005) . - pp 313 - 324 Titre : Comparison of three algorithms for filtering airborne lidar data Type de document : Article/Communication Auteurs : K. Zhang, Auteur ; D. Whitman, Auteur Année de publication : 2005 Article en page(s) : pp 313 - 324 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] algorithme de filtrage [Termes IGN] analyse comparative [Termes IGN] données lidar [Termes IGN] filtrage numérique d'image [Termes IGN] pente Résumé : (Auteur) This paper compares three methods for removing non-ground measurements from airborne laser scanning data. These methods, including the elevation threshold with expanding window (ETEW), maximum local slope (MLS), and progressive morphological (PM) filters, analyze data points based on variations of local slope, and elevation. Low and high-relief data sets with various densities of trees, houses, and sand dunes were selected to test the filtering methods. The results show that all three methods can effectively remove most non-ground points in both low-relief urban and high-relief forested areas. The PM filter generated the best result in coastal barrier island areas, whereas the other algorithms tended to remove the tops of steep sand dunes. Each method experienced various omission or commission errors, depending on the filtering parameters. Topographic slope is the most sensitive parameter for the three filtering methods. Numéro de notice : A2005-105 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.71.3.313 En ligne : https://doi.org/10.14358/PERS.71.3.313 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27243 [article]

A wavelet transform based for road centerline extraction / Tianen Chen in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 12 (December 2004)  

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A progressive morphological filter for removing nonground measurements from airborne Lidar data / K. Zhang in IEEE Transactions on geoscience and remote sensing, vol 41 n° 4 (April 2003)  

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