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Automatic registration of coastal remotely sensed imagery by affine invariant feature matching with shoreline constraint / Liang Cheng in Marine geodesy, vol 37 n° 1 (March - May 2014)  

Public [article]  inMarine geodesy > vol 37 n° 1 (March - May 2014) . - pp 32 - 46 Titre : Automatic registration of coastal remotely sensed imagery by affine invariant feature matching with shoreline constraint Type de document : Article/Communication Auteurs : Liang Cheng, Auteur ; Lihua Tong, Auteur ; Yongxue Liu, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 32 - 46 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] appariement d'images [Termes IGN] couple stéréoscopique [Termes IGN] littoral [Termes IGN] Ransac (algorithme) [Termes IGN] télédétection spatiale [Termes IGN] trait de côte Résumé : (Auteur) A new approach based on Affine Invariant Feature Matching (AIFM) with a filtering technique is proposed for automatic registration of remotely sensed image in coastal areas. The novelty of this approach is an automatic filtering technique using RANdom SAmple Consensus (RANSAC) with shoreline constraint for AIFM to remove all wrong matches and simultaneously keep as many correct matches as possible. To implement it, a progressive threshold strategy (from small value to large value) is presented to determine an appropriate RANSAC threshold, in which the progressive process is guided by shoreline constraint. The proposed approach (with filtering) is compared with standard AIFM (without filtering) using two typical image pairs in coastal areas. The experimental results indicate that the proposed approach can always provide much better matching results than standard AIFM. Numéro de notice : A2015-162 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/01490419.2013.868382 Date de publication en ligne : 02/08/2013 En ligne : https://doi.org/10.1080/01490419.2013.868382 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75849 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
230-2014011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Using models of the ocean's mean dynamic topography to identify errors in coastal geodetic levelling / M. S. Filmer in Marine geodesy, vol 37 n° 1 (March - May 2014)  

Public [article]  inMarine geodesy > vol 37 n° 1 (March - May 2014) . - pp 47 - 64 Titre : Using models of the ocean's mean dynamic topography to identify errors in coastal geodetic levelling Type de document : Article/Communication Auteurs : M. S. Filmer, Auteur Année de publication : 2014 Article en page(s) : pp 47 - 64 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Nivellement [Termes IGN] données GNSS [Termes IGN] geoïde marin [Termes IGN] littoral [Termes IGN] niveau moyen des mers [Termes IGN] nivellement géodésique [Termes IGN] quasi-géoïde [Termes IGN] trait de côte Résumé : (Auteur) Identifying errors (blunders and systematic errors) in coastal geodetic levelling networks has often been problematic, primarily for two reasons. First, mean sea level (MSL) at tide gauges cannot be directly compared to height differences from levelling because the geoid/quasigeoid and MSL are not parallel, being separated by the ocean's mean dynamic topography (MDT). Second, there is a the lack of redundancy at the edge of the levelling network. This article sets out a methodology to independently identify blunders and/or systematic errors (over long distances) in geodetic levelling using MDT models to account for the separation between the geoid/quasigeoid and MSL at tide gauges. This method is then tested in a case study using an oceanographic MDT model, MSL observations, GNSS data, and a quasigeoid model. The results are significant because the errors found could not be detected by standard levelling misclosure checks alone, with supplementary data from an MDT model, with cross-validation from GNSS-quasigeoid allowing their detection. In addition, it appears that an oceanographic-only MDT is as effective as GNSS and a quasigeoid model for detecting levelling errors, which could be particularly useful for countries with coastal levelling errors in their levelling networks that cannot be identified by conventional levelling closure checks. Numéro de notice : A2015-163 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/01490419.2013.868383 Date de publication en ligne : 29/10/2010 En ligne : https://doi.org/10.1080/01490419.2013.868383 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75850 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
230-2014011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Oceanwide precise determination of sea surface height from in-situ measurements on cargo ships / Ole Roggenbuck in Marine geodesy, vol 37 n° 1 (March - May 2014)  

Public [article]  inMarine geodesy > vol 37 n° 1 (March - May 2014) . - pp 77 - 96 Titre : Oceanwide precise determination of sea surface height from in-situ measurements on cargo ships Type de document : Article/Communication Auteurs : Ole Roggenbuck, Auteur ; Jörg Reinking, Auteur ; Alexander Härting, Auteur Année de publication : 2014 Article en page(s) : pp 77 - 96 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse comparative [Termes IGN] données GNSS [Termes IGN] données Jason [Termes IGN] hauteurs de mer [Termes IGN] Pacifique (océan) [Termes IGN] précision centimétrique [Vedettes matières IGN] Altimétrie Résumé : (Auteur) Thanks to the latest developments in GNSS data processing the antenna heights aboard a ship can be determined with accuracies of up to 5 cm, also in the open ocean. These heights are a good basis to derive precise in-situ data of sea surface heights independently from satellite altimetry. However, for a reliable determination of sea surface heights, some essential hydrostatic and hydrodynamic corrections must be considered, as explained in this paper. Furthermore, an ocean wide determination of sea surface height from measurements on a container ship in the Pacific Ocean is presented. The results are compared with those from the Jason-2 altimeter. Numéro de notice : A2015-164 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/01490419.2013.868385 Date de publication en ligne : 14/01/2019 En ligne : https://doi.org/10.1080/01490419.2013.868385 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75851 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
230-2014011	RAB	Revue	Centre de documentation	En réserve L003	Disponible