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Assessing the effectiveness and efficiency of map colour for colour impairments using an eye-tracking approach / Weihua Dong in Cartographic journal (the), Vol 53 n° 2 (May 2016)  

Public [article]  inCartographic journal (the) > Vol 53 n° 2 (May 2016) . - pp 166 - 176 Titre : Assessing the effectiveness and efficiency of map colour for colour impairments using an eye-tracking approach Type de document : Article/Communication Auteurs : Weihua Dong, Auteur ; S. Zhang, Auteur ; Hua Liao, Auteur Année de publication : 2016 Article en page(s) : pp 166 - 176 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rédaction cartographique [Termes IGN] Chine [Termes IGN] couleur (rédaction cartographique) [Termes IGN] daltonisme [Termes IGN] lecture de carte [Termes IGN] oculométrie [Termes IGN] teinte Résumé : (Auteur) Colour impairments influences access to geographical information which is usually represented by colour maps. Three dimensions of colour: Hue, Saturation and Value (HSV), are intuitive and most critical visual variables in map design. In this paper, we specifically focus on colour deficiency of red-green colour impairments. A controlled experiment was designed and conducted to explore how three colour dimensions (HSV) affect the abilities of people with normal colour vision or with red-green colour impairments to distinguish colours in maps. An eye-tracking approach was applied to quantify the accuracy and response time by capturing user eye movements to analyse the effectiveness and efficiency. In this study, we used one section of the administrative map of Hebei Province to test participant responses to area features. Differences of effectiveness and efficiency across normal colour vision and red-green colour impairments were compared. Multiple comparisons among Hue, Saturation and Value were analysed. Results show that for both normal colour vision and red-green colour impairments, Hue is the most differentiable than Saturation and Value. Saturation and Value are at the same level to be differentiated and more difficult to be distinguished. Guidelines of designing maps for both normal colour vision and red-green colour impairments were derived. The results of this study can be helpful to improve the map designs for colour deficiency. Numéro de notice : A2016-512 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/1743277413Y.0000000053 En ligne : http://dx.doi.org/10.1179/1743277413Y.0000000053 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81583 [article]

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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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Interference suppression algorithm for SAR based on time-frequency transform / S. Zhang in IEEE Transactions on geoscience and remote sensing, vol 49 n° 10 Tome 1 (October 2011)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 49 n° 10 Tome 1 (October 2011) . - pp 3765 - 3779 Titre : Interference suppression algorithm for SAR based on time-frequency transform Type de document : Article/Communication Auteurs : S. Zhang, Auteur ; X. Xing, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 3765 - 3779 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] filtre passe-bande [Termes IGN] image radar moirée [Termes IGN] interférence [Termes IGN] transformation de Fourier [Termes IGN] transformation en ondelettes Résumé : (Auteur) The goal of this paper is to suppress the narrowband interference (NBI) and wideband interference (WBI) in synthetic aperture radar (SAR) by using a nonparametric method. The method is based on the analysis of time-frequency characteristic of NBI and WBI from which an interference suppression filter combined with the constant false alarm rate algorithm is designed. In this approach, the short-time Fourier transform (STFT) is used to estimate the instantaneous frequency of the SAR echo data with interference. In the STFT domain, the instantaneous frequency spectrum is represented by wavelet, and then, the designed filter filters the corresponding wavelet coefficients of the interference components. In addition, this algorithm is robust to time-varying NBI and WBI. The performance of the proposed approach is evaluated by the simulated and measured data, and the effectiveness is demonstrated. Numéro de notice : A2011-428 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2011.2164409 Date de publication en ligne : 15/09/2011 En ligne : https://doi.org/10.1109/TGRS.2011.2164409 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31207 [article]

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Studies on object reconstruction from space using three-line scanner imagery / Heinrich Ebner in ISPRS Journal of photogrammetry and remote sensing, vol 44 n° 4 (December 1989)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 44 n° 4 (December 1989) . - pp 225 - 233 Titre : Studies on object reconstruction from space using three-line scanner imagery Type de document : Article/Communication Auteurs : Heinrich Ebner, Auteur ; F. Muller, Auteur ; S. Zhang, Auteur Année de publication : 1989 Article en page(s) : pp 225 - 233 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] capteur en peigne [Termes IGN] image numérique [Termes IGN] modèle numérique de terrain [Termes IGN] objet géographique [Termes IGN] optique électronique [Termes IGN] orthophotographie [Termes IGN] reconstruction d'objet [Termes IGN] stéréoscopie [Termes IGN] traitement d'image Numéro de notice : A1989-367 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/0924-2716(89)90002-6 En ligne : https://doi.org/10.1016/0924-2716(89)90002-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25326 [article]

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081-89072	RAB	Revue	Centre de documentation	En réserve L003	Disponible