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A virtual globe-based visualization and interactive framework for a small craft navigation assistance system in the near sea / Xinzhu Liu in Journal of Traffic and Transportation Engineering (English Edition), n° (April 2017)  

Public [article]  inJournal of Traffic and Transportation Engineering (English Edition) > n° (April 2017) Titre : A virtual globe-based visualization and interactive framework for a small craft navigation assistance system in the near sea Type de document : Article/Communication Auteurs : Xinzhu Liu, Auteur ; Shigeaki Shiotani, Auteur Année de publication : 2017 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] accident [Termes descripteurs IGN] approche objet [Termes descripteurs IGN] C# [Termes descripteurs IGN] cible mobile [Termes descripteurs IGN] globe virtuel [Termes descripteurs IGN] Japon [Termes descripteurs IGN] Javascript (langage de script) [Termes descripteurs IGN] KML [Termes descripteurs IGN] navigation maritime [Termes descripteurs IGN] service web géographique [Termes descripteurs IGN] SIG 3D [Termes descripteurs IGN] temps réel [Vedettes matières IGN] Géovisualisation Résumé : (auteur) With the growing popularization of small crafts, the accidents that happen among such crafts are also drawing increasing attention, according to the marine accident data released by the Japan Coast Guard. In order to prevent possible navigation accidents, the authors considered that besides sharing information from land by the coast office broadly, managers on land can also watch out and give appropriate advice for operators in crafts one-to-one. This paper discusses the technical issues of developing virtual globe-based (Google Maps/Earth geographic information system (GIS)) 3D visualization stand-alone software for small craft navigation assistance in the aim to facilitate the safety and sufficiency of small crafts in the near sea. The system was developed using web services and object-oriented programming disciplines to support the integration of a virtual global framework, GPS, and real-time imaging data. The authors have also developed data processing programs that are glued together with C# language, JavaScript language, National Marine Electronics Association (NMEA) instance data, and keyhole markup language (KML) data. Experiments for evaluating the framework have been made around the near coastal area. The performances and deficiencies are discussed in this paper. In order to evaluate the validity of the performance and the functionality of the system, authors conducted a questionnaire survey among third year students of the Voyage Course at Kobe University. The evaluation of the system suggests valuable potential for the small craft navigation assistance system. Numéro de notice : A2017-132 Thématique : GEOMATIQUE Nature : Article En ligne : http://doi.org/10.1016/j.jtte.2016.03.011 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84537 [article]

Land-surface segmentation as a method to create strata for spatial sampling and its potential for digital soil mapping / L. Drăguț in International journal of geographical information science IJGIS, vol 30 n° 7- 8 (July - August 2016)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 7- 8 (July - August 2016) . - pp 1359 - 1376 Titre : Land-surface segmentation as a method to create strata for spatial sampling and its potential for digital soil mapping Type de document : Article/Communication Auteurs : L. Drăguț, Auteur ; A. Dornik, Auteur Année de publication : 2016 Article en page(s) : pp 1359 - 1376 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes descripteurs IGN] analyse d'image numérique [Termes descripteurs IGN] analyse de groupement [Termes descripteurs IGN] approche objet [Termes descripteurs IGN] cartographie numérique [Termes descripteurs IGN] échantillonnage de données [Termes descripteurs IGN] modèle numérique de surface [Termes descripteurs IGN] validation des données Résumé : (Auteur) Sampling efforts are constrained by limited availability of resources. Therefore, methods to reduce the number of samples, while still achieving reasonable accuracy are needed. Land-surface segmentation (LSS) has proven a powerful technique to partition digital elevation models (DEMs) and their derivatives into relatively homogeneous areas, which can be further employed as support in soil sampling. Though topography is one of the main soil forming factors, a robust assessment of the potential of this technique to digital soil mapping (DSM) is still missing. In this study, we aimed at evaluating the potential of LSS in stratifying a landscape into relatively homogeneous areas, which can be used as strata for guiding the selection of sampling points in DSM. The experiments were carried out in two study areas where soil samples were available. Land-surface derivatives were derived from DEMs and segmented with a tool based on the multiresolution segmentation algorithm, into objects considered as homogeneous soil-landscape divisions. Thus, one sample was randomly selected within each segment from the existing sample data, based on which predictions of soil classes/sub-orders and properties, i.e. soil texture and A-horizon thickness, were made. Results were compared with predictions based on simple random sampling (SRS) and conditioned Latin hypercube (cLHS). The segmentation-based sampling (SBS) scheme performed better than SRS and cLHS schemes in predicting the A-horizon thickness, soil texture fractions and soil classes, showing a high potential of LSS in stratifying a landscape for the purposes of DSM. The novelty of this study is in the way strata are constructed, rather than in the sampling design itself. Further research is needed to demonstrate the value of a SBS design for practical use. The analyses presented here further highlight the importance of considering locally adaptive techniques in optimization of sampling schemes and predictions of soil properties. Numéro de notice : A2016-307 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1131828 En ligne : http://dx.doi.org/10.1080/13658816.2015.1131828 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80906 [article]

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Mapping tree species diversity of a tropical montane forest by unsupervised clustering of airborne imaging spectroscopy data / Elisa Schäfer in Ecological indicators, vol 64 (May 2016)  

Public [article]  inEcological indicators > vol 64 (May 2016) . - pp 49 - 58 Titre : Mapping tree species diversity of a tropical montane forest by unsupervised clustering of airborne imaging spectroscopy data Type de document : Article/Communication Auteurs : Elisa Schäfer, Auteur ; Janne Heiskanen, Auteur ; Vuokko Heikinheimo, Auteur ; Petri Pellikka, Auteur Année de publication : 2016 Article en page(s) : pp 49 - 58 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes descripteurs IGN] approche objet [Termes descripteurs IGN] arbre (flore) [Termes descripteurs IGN] biodiversité [Termes descripteurs IGN] canopée [Termes descripteurs IGN] forêt tropicale [Termes descripteurs IGN] image aérienne [Termes descripteurs IGN] Kenya [Termes descripteurs IGN] placette d'échantillonnage [Termes descripteurs IGN] segmentation d'image Résumé : (auteur) With the ongoing global biodiversity loss, approaches to measuring and monitoring biodiversity are necessary for effective conservation planning, especially in tropical forests. Remote sensing has much potential for biodiversity mapping, and high spatial resolution imaging spectroscopy (IS) allows for direct prediction of tree species diversity based on spectral reflectance. The objective of this study was to test an approach for mapping tree species alpha diversity that takes advantage of an unsupervised object-based clustering. Tree species diversity of a tropical montane forest in the Taita Hills, Kenya, was mapped based on spectral variation of high spatial resolution IS data. Airborne IS data and species data from 31 field plots were collected in the study area. Species diversity measures were obtained from the IS data by clustering spectrally similar image segments representing tree crowns. In order to do this, the image was segmented to objects that represented tree crowns. Three measures of species diversity were calculated based on the field data and on the clustering results, and the relationships were statistically analyzed. According to the results, the approach succeeded well in revealing tree species diversity patterns. Especially, tree species richness was well predicted (RMSE = 3 species; r2 = 0.50) directly based on the clustering results. The optimal number of clusters was found to be close to the estimated number of tree species in the forest. Minimum tree size was an important determinant of the relationships, because only part of the trees are visible to the airborne sensor in the multi-layered closed canopy forest. In general, the object-based approach proved to be a viable alternative to a pixel-based clustering. The approach takes advantage of the capability of IS to detect spectral differences among tree crowns, but without the need for spectral training data, which is expensive to collect. With further development, the approach could be applied also for estimating beta diversity. Numéro de notice : A2016-346 Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern En ligne : http://dx.doi.org/10.1016/j.ecolind.2015.12.026 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81035 [article]

Coregistration refinement of hyperspectral images and DSM: An object-based approach using spectral information / Janja Avbelj in ISPRS Journal of photogrammetry and remote sensing, vol 100 (February 2015)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 100 (February 2015) . - pp 23 - 34 Titre : Coregistration refinement of hyperspectral images and DSM: An object-based approach using spectral information Type de document : Article/Communication Auteurs : Janja Avbelj, Auteur ; Dorota Iwaszczuk, Auteur ; Rupert Müller, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 23 - 34 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes descripteurs IGN] analyse spectrale [Termes descripteurs IGN] appariement d'images [Termes descripteurs IGN] approche objet [Termes descripteurs IGN] détection du bâti [Termes descripteurs IGN] données multicapteurs [Termes descripteurs IGN] image hyperspectrale [Termes descripteurs IGN] milieu urbain [Termes descripteurs IGN] modèle numérique de surface [Termes descripteurs IGN] superposition d'images Résumé : (auteur) For image fusion in remote sensing applications the georeferencing accuracy using position, attitude, and camera calibration measurements can be insufficient. Thus, image processing techniques should be employed for precise coregistration of images. In this article a method for multimodal object-based image coregistration refinement between hyperspectral images (HSI) and digital surface models (DSM) is presented. The method is divided in three parts: object outline detection in HSI and DSM, matching, and determination of transformation parameters. The novelty of our proposed coregistration refinement method is the use of material properties and height information of urban objects from HSI and DSM, respectively. We refer to urban objects as objects which are typical in urban environments and focus on buildings by describing them with 2D outlines. Furthermore, the geometric accuracy of these detected building outlines is taken into account in the matching step and for the determination of transformation parameters. Hence, a stochastic model is introduced to compute optimal transformation parameters. The feasibility of the method is shown by testing it on two aerial HSI of different spatial and spectral resolution, and two DSM of different spatial resolution. The evaluation is carried out by comparing the accuracies of the transformations parameters to the reference parameters, determined by considering object outlines at much higher resolution, and also by computing the correctness and the quality rate of the extracted outlines before and after coregistration refinement. Results indicate that using outlines of objects instead of only line segments is advantageous for coregistration of HSI and DSM. The extraction of building outlines in comparison to the line cue extraction provides a larger amount of assigned lines between the images and is more robust to outliers, i.e. false matches. Numéro de notice : A2015-051 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern En ligne : http://www.sciencedirect.com/science/article/pii/S0924271614001282 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75237 [article]

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Méthode de cartographie de la consommation de sol agricole dans le Grand Genève / Marie-Laure Halle (2015) 

Public Titre : Méthode de cartographie de la consommation de sol agricole dans le Grand Genève Type de document : Mémoire Auteurs : Marie-Laure Halle, Auteur Editeur : Strasbourg : Institut National des Sciences Appliquées INSA Strasbourg Année de publication : 2015 Importance : 66 p. Format : 21 x 30 cm Note générale : Bibliographie Mémoire de fin d'études INSA Strasbourg Langues : Français (fre) Descripteur : [Termes descripteurs IGN] agglomération [Termes descripteurs IGN] analyse des besoins [Termes descripteurs IGN] analyse diachronique [Termes descripteurs IGN] approche objet [Termes descripteurs IGN] base de données localisées [Termes descripteurs IGN] carte d'occupation du sol [Termes descripteurs IGN] carte transfrontalière [Termes descripteurs IGN] cartographie urbaine [Termes descripteurs IGN] collecte de données [Termes descripteurs IGN] état de l'art [Termes descripteurs IGN] Genève [Termes descripteurs IGN] harmonisation des données [Termes descripteurs IGN] outil d'aide à la décision [Termes descripteurs IGN] prototype [Termes descripteurs IGN] surface cultivée [Termes descripteurs IGN] urbanisme [Termes descripteurs IGN] utilisation du sol [Termes descripteurs IGN] zone (aménagement du territoire) [Vedettes matières IGN] Géovisualisation Index. décimale : INSAS Mémoires d'ingénieur de l'INSA Strasbourg - Topographie, ex ENSAIS Résumé : (Auteur) Le grand Genève est une agglomération très dynamique, un de ses enjeux principaux est de limiter la consommation de sol agricole. Le projet consiste en la mise au point d'un outil cartographique transfrontalier. Les questions à résoudre relatives aux données ont été : leur disponibilité variable selon les territoires, l'accès aux sources, leur actualisation, leur harmonisation, leur traitement. Les deux prototypes développés sur un périmètre test, permettent un suivi annuel de la consommation du sol agricole, ainsi qu'un suivi de l'évolution décennale de l'utilisation des sols. Ils s'accompagnent de recommandations pour l'extension et la pérennisation des méthodes sur l'ensemble du Grand Genève. Enfin une proposition de vulgarisation de ces outils techniques permettra une meilleure communication. Numéro de notice : 22485 Thématique : GEOMATIQUE/URBANISME Nature : Mémoire ingénieur INSAS Note de thèse : Mémoire d'ingénieur : Topographie : Strasbourg, INSA : 2015 Organisme de stage : Le Grand Genève Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80731

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Object-based interpretation methods for mapping built-up areas / Leena Matikainen (2012)    

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Conception d'un observatoire pour le développement territorial : Cas de la Guinée forestière / A. Camara in Revue internationale de géomatique, vol 20 n° 3 (septembre - novembre 2010)

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