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Alerte-Géovisualisation
Geovisualization of artificial land use in European cities in 2006, with urban scaling laws (2021)
contenu dans European Colloquium on Theoretical and Quantitative Geography 2021, Manchester, 3-5 November 2021 (2021) Geovisualization of artificial land use in European cities in 2006, with urban scaling laws [Article/Communication] / Axel Pecheric, Auteur ; Rémi Lemoy, Auteur ; Marion Le Texier, Auteur ; Geoffrey Caruso, Auteur . - Manchester [Royaume-Uni] : Manchester University Press, 2021 . - pp 138 - 142.bibliographieLangues : Anglais (eng)Descripteur : [Termes IGN] croissance urbaine[Termes IGN] Europe (géographie politique)[Termes IGN] urbanisation[Termes IGN] utilisation du sol[Termes IGN] ville[Vedettes matières IGN] Géovisualisation Numéro de notice : C2021-077 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100064 Photorealism in mixed reality: a systematic literature review
Photorealism in mixed reality: a systematic literature review [Article/Communication] / Lidiane Pereira, Auteur ; Wellingston C. Roberti Junior, Auteur ; Rodrigo L. S. Silva, Auteur . - 2021 . - pp 15 - 29.bibliographieLangues : Anglais (eng)in International journal of virtual reality, IJVR > Vol 21 n° 1 (2021) . - pp 15 - 29Descripteur : [Vedettes matières IGN] Informatique[Termes IGN] éclairement lumineux[Termes IGN] lancer de rayons[Termes IGN] réalité augmentée[Termes IGN] réalité mixte[Termes IGN] rendu réaliste Résumé : (auteur) In Augmented Reality systems, virtual objects are combined with real objects, both three dimensional, interactively and at run-time. In an ideal scenario, the user has the feeling that real and virtual objects coexist in the same space and is unable to differentiate the types of objects from each other. To achieve this goal, research on rendering techniques have been conducted in recent years. In this paper, we present a Systematic Literature Review aiming to identify the main characteristics concerning photorealism in Mixed and Augmented Reality systems to find research opportunities that can be further exploited or optimized. The objective is to verify if exists a definition of photorealism in Mixed and Augmented Reality. We present a theoreticalfundamental over the most used methods concerning realism in Computer Graphics. Also, we want to identify the most used methods and tools to enable photorealism in Mixed and Augmented Reality systems. Numéro de notice : A2021-957 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.20870/IJVR.2021.21.1.3166 Date de publication en ligne : 20/05/2021 En ligne : https://doi.org/10.20870/IJVR.2021.21.1.3166 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100032 3D geovisualization for visual analysis of urban climate
3D geovisualization for visual analysis of urban climate = Géovisualisation en 3D pour l'analyse visuelle du climat urbain [Article/Communication] / Sidonie Christophe, Auteur ; Jacques Gautier, Auteur ; Paul Chapron, Auteur ; Luke Riley, Auteur ; Valéry Masson, Auteur . - 2022 . - n° 1008.BibliographieLangues : Anglais (eng)in Cybergeo, European journal of geography > vol 2022 [01/01/2022] . - n° 1008Descripteur : [Termes IGN] analyse visuelle[Termes IGN] climat urbain[Termes IGN] données météorologiques[Termes IGN] données topographiques[Termes IGN] ilot thermique urbain[Termes IGN] morphologie urbaine[Termes IGN] visualisation 3D[Vedettes matières IGN] Géovisualisation Résumé : (Auteur) This paper is about the relevance of proposing geovisualization methods to visually integrate, co-visualize and interact with urban and meteorological data into a 3D environment, in order to support the visual analysis of the urban climate. Meteorological experts and researchers already face meteorological data and climate models analysis issues, at larger scales into the city: yet even if they have existing practices and tools to address these issues, they could take benefit from the knowledge and the methods from the Geovisualization domain, to complement these analyses by a visuospatial reasoning approach. In this paper, based on the knowledge of the expectations of the meteorological experts we are working with, we brought climate analysis into the city and visuospatial reasoning closer, on both heterogeneous urban and air temperature data(1). We reviewed the existing works regarding geovisualization of spatio-temporal phenomena and visualization of meteorological data (2). We then presented the different approaches we fulfilled to provide a 3D geovisualization environment and graphic representations, visually integrating both meteorological and spatial data. One provides style and interaction capacities on those data, enabling the interactive 3D exploration of their spatial and value distributions, throughout the city. Another geovisualization-design experiment is presented as a co-visualization of meteorological data and morphological indicators on 2.5D maps (3). These complementary approaches are presented and discussed with the meteorological experts, based on their relevance to tackle climate analysis at a larger scale and on the refinements required to extend their exploration capacities (4). Numéro de notice : A2022-270 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE/IMAGERIE/URBANISME Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : 10.4000/cybergeo.38518 Date de publication en ligne : 17/03/2022 En ligne : https://doi.org/10.4000/cybergeo.38518 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100206 Visualisation spatio-temporelle de données COVID-19 (2022)
Visualisation spatio-temporelle de données COVID-19 [Mémoire] / Aymeric Dutremble, Auteur . - Champs-sur-Marne : Ecole nationale des sciences géographiques ENSG, 2022 . - 34 p. ; 21 x 30 cm.Bibliographie
Rapport de projet pluridisciplinaire, cycle ING2Langues : Français (fre)Descripteur : [Termes IGN] application web[Termes IGN] Cascading Style Sheets CSS[Termes IGN] données spatiotemporelles[Termes IGN] épidémie[Termes IGN] HTML[Termes IGN] prototype[Termes IGN] représentation cartographique 3D[Termes IGN] visualisation 3D[Vedettes matières IGN] Géovisualisation Index. décimale : PROJET Mémoires : Rapports de projet - stage des ingénieurs de 2e année Résumé : (Auteur) Suite à l’épidémie que nous venons de vivre, une problématique a été remise en avant. Comment représenter spatialement et temporellement une donnée dans une unique géovisualisation. En d’autres termes, comment sur une carte est-il possible de visualiser des données possédant une position géographique (des coordonnées) et une position dans le temps (une date). Et plus généralement, dans le cadre de la pandémie, comment utiliser la géovisualisation pour analyser les dynamiques d’une telle épidémie. L’équipe GEOVIS du LASTIG a pris en main le sujet en proposant deux prototypes de visualisation spatio-temporelle via deux applications web en utilisant des données COVID-19 simulées. Un premier prototype vient représenter la donnée spatio-temporelle en deux dimensions et un second en trois dimensions. L’objectif est de créer une nouvelle visualisation qui permet de mixer ces deux méthodes. Cette application web en trois dimensions affiche les deux méthodes selon la position de l’utilisateur dans l’espace. Elle affiche aussi une méthode de visualisation hybride entre les deux prototypes. Créer cette application avec ces différents concepts va permettre d’avoir une nouvelle manière d’appréhender les données spatio-temporelles. Elles seront mises en valeur d’une manière inédite qui pourra améliorer l’analyse de ce type de données. Note de contenu : Introduction 1. Contexte et objectif du projet 1.1 Organisation et contexte 1.2 Growth Ring Map 1.3 Space-Time Cube 1.4 Nouvelle visualisation et objectif 2. Prise en main et mise en place 2.1 Langage, structure et bibliothèque 2.2 Maillage hexagonal 2.3 Hexagone 3D 2.4 Transition 3. Légendes et outils additionnels 3.1 Panneau de contrôle 3.2 Interaction 3.3 Fonctionnalités secondaires 3.4 Diagramme temporel 3.5 Légendes Conclusion Numéro de notice : 26867 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Mémoire de projet pluridisciplinaire Organisme de stage : LASTIG (IGN) Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101682 Méthode d’évaluation de l’audibilité d’un système d’alerte SAIP (2022)
Méthode d’évaluation de l’audibilité d’un système d’alerte SAIP [Article/Communication] / Jonathan Siliézar, Auteur ; Pierre Aumond, Auteur ; Paul Chapron, Auteur ; Matthieu Péroche, Auteur ; A. Can, Auteur . - Société française d'acoustique, 2022 . - 4 p. ; 21 x 30 cm.bibliographieLangues : Français (fre)Descripteur : [Termes IGN] bruit (audition)[Termes IGN] Hérault (34)[Termes IGN] message d'alerte[Termes IGN] milieu urbain[Termes IGN] modélisation[Termes IGN] optimisation spatiale[Termes IGN] paysage sonore[Termes IGN] propagation du son[Termes IGN] protection civile[Termes IGN] questionnaire[Termes IGN] représentation cartographique[Termes IGN] risque naturel[Termes IGN] risque technologique[Vedettes matières IGN] Géovisualisation Résumé : (auteur) En France, les sirènes de sécurité civile du Système d’Alerte et d’Information des Population (SAIP) sont utilisées par les autorités pour signaler une menace imminente ou en cours. Même si l’on connaît leur niveau sonore, il est néanmoins difficile d’évaluer leur audibilité, notamment en milieu urbain à cause du masquage par des sources sonores secondaires. Un protocole expérimental a été déployé autour d’une sirène standard installée sur la commune de Saint-Martin-de-Londres (Hérault) en collaboration avec un groupe d’étudiants de géographie et le Laboratoire de Géographie et d’Aménagement de Montpellier (LAGAM - Université Paul Valéry Montpellier 3). Des mesures de niveau sonore pendant l’activation de la source ont été prises grâce à l’application NoiseCapture à différentes distances et sur plusieurs axes par les étudiants. Il ont aussi été invités à remplir un questionnaire sur des informations perceptives de la sirène comme son audibilité, le niveau sonore perçu ou le masquage de la sirène par le passage de véhicules. Une étape de simulation de l’environnement sonore à l’aide du logiciel NoiseModelling a également été réalisée pour comparer les résultats mesurés avec les résultats simulés. Les résultats de l’étude valident l’utilisation de l’outil NoiseModelling pour simuler l’audibilité du signal sonore dans un rayon de 2,8 kilomètres autour de la sirène. Numéro de notice : C2022-049 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésNat DOI : sans En ligne : https://hal.science/hal-03777367v2/file/hal-03777367.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102523 - IGN, changer d'échelle ! [Article/Communication] / Jean-Pierre Maillard, Auteur . - 2022 . - pp 10-11.Langues : Français (fre)in XYZ > n° 170 (mars 2022) . - pp 10-11
Descripteur : [Vedettes matières IGN] Géomatique[Termes IGN] carte thématique[Termes IGN] données localisées numériques[Termes IGN] géovisualisation[Termes IGN] Institut national de l'information géographique et forestière (France)[Termes IGN] transition écologique Résumé : (Auteur) Le 24 novembre 2021, l’institut national de l’information géographique et forestière (IGN) a présenté à ses partenaires institutionnels, industriels et citoyens les premières conclusions de la concertation initiée en mai 2021 sur un projet “géo-communs, avançons ensemble !”, menée en lien avec un ensemble d’acteurs de la communauté géomatique. Réunis dans les murs de Ground Control, l’endroit à la mode du 12ème arrondissement de Paris qui se présente comme un lieu de vie culturel, indépendant et engagé où l’on peut nourrir le corps et l’esprit. Les participants ont été accueillis par Mme Emmanuelle Prada-Bordenave, présidente du conseil d’administration de l’IGN, qui a introduit la rencontre en déclarant que l’institut a engagé sa mue et la recherche de la souveraineté numérique. Puis M. Sébastien Soriano, directeur général, a présenté les actions entreprises déclinées sous forme de chantiers et invité plusieurs intervenants à exprimer leurs points de vue sur différents sujets en relation avec les problématiques tels le biomimétisme ou la carte de France de la nature sauvage. Numéro de notice : A2022-222 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtSansCL DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100186 High-performance adaptive texture streaming and rendering of large 3D cities
High-performance adaptive texture streaming and rendering of large 3D cities [Article/Communication] / Alex Zhang, Auteur ; Kan Chen, Auteur ; Henry Johan, Auteur ; Marius Erdt, Auteur . - 2022.bibliographieLangues : Anglais (eng)in The Visual Computer > vol 38 n° 4 (April 2022)Descripteur : [Vedettes matières IGN] Traitement d'image[Termes IGN] couleur à l'écran[Termes IGN] flux continu[Termes IGN] modèle 3D de l'espace urbain[Termes IGN] rendu (géovisualisation)[Termes IGN] texturage[Termes IGN] ville Résumé : (auteur) We propose a high-performance texture streaming system for real-time rendering of large 3D cities with millions of textures. Our main contribution is a texture streaming system that automatically adjusts the streaming workload at runtime based on measured frame latencies, specifically addressing the high memory binding costs of hardware virtual texturing which causes frame rate stuttering. Our system streams textures in parallel with prioritization based on GPU computed mesh perceptibility, and these textures are cached in a sparse partially resident image at runtime without the need for a texture preprocessing step. In addition, we improve rendering quality by minimizing texture pop-in artifacts using a color blending scheme based on mipmap levels. We evaluate our texture streaming system using three structurally distinct datasets with many textures and compared it to a baseline, a game engine, and our prior method. Results show an 8X improvement in rendering performance and 7X improvement in rendering quality compared to the baseline. Numéro de notice : A2022-148 Affiliation des auteurs : non IGN Thématique : IMAGERIE/INFORMATIQUE Nature : Article DOI : 10.1007/s00371-021-02152-z Date de publication en ligne : 01/06/2021 En ligne : https://doi.org/10.1007/s00371-021-02152-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100043 A GAN-based approach toward architectural line drawing colorization prototyping
A GAN-based approach toward architectural line drawing colorization prototyping [Article/Communication] / Qian (Chayn) Sun, Auteur ; Yan Chen, Auteur ; Wenyuan Tao, Auteur ; Han Jiang, Auteur ; Mu Zhang, Auteur ; Kan Chen, Auteur ; Marius Erdt, Auteur . - 2022 . - pp 1283 - 1300.bibliographieLangues : Anglais (eng)in The Visual Computer > vol 38 n° 4 (April 2022) . - pp 1283 - 1300Descripteur : [Termes IGN] architecture[Termes IGN] bâtiment[Termes IGN] couleur (variable spectrale)[Termes IGN] prototype[Termes IGN] réseau antagoniste génératif[Vedettes matières IGN] Géovisualisation Résumé : (auteur) Line drawing with colorization is a popular art format and tool for architectural illustration. The goal of this research is toward generating a high-quality and natural-looking colorization based on an architectural line drawing. This paper presents a new Generative Adversarial Network (GAN)-based method, named ArchGANs, including ArchColGAN and ArchShdGAN. ArchColGAN is a GAN-based line-feature-aware network for stylized colorization generation. ArchShdGAN is a lighting effects generation network, from which the building depiction in 3D can benefit. In particular, ArchColGAN is able to maintain the important line features and the correlation property of building parts as well as reduce the uneven colorization caused by sparse lines. Moreover, we proposed a color enhancement method to further improve ArchColGAN. Besides the single line drawing images, we also extend our method to handle line drawing image sequences and achieve rotation animation. Experiments and studies demonstrate the effectiveness and usefulness of our proposed method for colorization prototyping. Numéro de notice : A2022-154 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s00371-021-02219-x Date de publication en ligne : 23/07/2021 En ligne : https://doi.org/10.1007/s00371-021-02219-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100292 - Swipe versus multiple view: a comprehensive analysis using eye-tracking to evaluate user interaction with web maps [Article/Communication] / Stanislav Popelka, Auteur ; Jaroslav Burian, Auteur ; Marketa Beitlova, Auteur . - 2022 . - pp 252 - 270.bibliographieLangues : Anglais (eng)in Cartography and Geographic Information Science > vol 49 n° 3 (May 2022) . - pp 252 - 270
Descripteur : [Termes IGN] analyse géovisuelle[Termes IGN] ArcGIS online[Termes IGN] carte interactive[Termes IGN] cartographie par internet[Termes IGN] interactivité[Termes IGN] interface web[Termes IGN] oculométrie[Termes IGN] représentation cognitive[Termes IGN] utilisateur civil[Termes IGN] vision[Termes IGN] web mapping[Vedettes matières IGN] Cartologie Résumé : (auteur) The comparison of multiple maps is a common fundamental process used by geographers to explore the world. The most frequently applied interactive methods for the comparison of maps are multiple view and swipe. Swipe allows the user to interactively drag and overlap two different maps. Multiple view is based on the simultaneous side-by-side display of several maps. The current paper presents an analysis of the use of these two map comparison techniques in an Esri environment using an eye-tracking study which involved 25 participants. The participants completed two different tasks which compared land suitability using two or four maps. Based on an analysis of the recorded data, we compared the effectiveness of these methods through the accuracy of answers, the trial duration, and eye-tracking metrics of the individual compositional elements of the interactive maps. Cognitive processing was investigated through the analysis of dynamic areas of interest. This labor-intensive analysis yielded results which could be visualized using sequence charts. Based on these analyses, we concluded that the participants worked more effectively with multiple views, especially in comparing four maps. Working with swipe in the Esri environment is non-intuitive in comparisons of more than two maps. Many participants instead preferred simple toggling between layers instead of interactive swipe comparisons. However, when swipe was used to compare two maps, the method was more efficient, especially during cognitively demanding tasks. Numéro de notice : A2022-293 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/15230406.2021.2015721 Date de publication en ligne : 25/01/2022 En ligne : https://doi.org/10.1080/15230406.2021.2015721 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100343 - Building Information Modelling (BIM) for property valuation: A new approach for Turkish Condominium Ownership [Article/Communication] / Nida Celik Simsek, Auteur ; Bayram Uzun, Auteur . - 2022 . - pp 187 - 208.bibliographieLangues : Anglais (eng)in Survey review > vol 54 n° 384 (May 2022) . - pp 187 - 208
Descripteur : [Vedettes matières IGN] Cadastre étranger[Termes IGN] cadastre étranger[Termes IGN] évaluation foncière[Termes IGN] lever cadastral[Termes IGN] modélisation 3D du bâti BIM[Termes IGN] propriété foncière[Termes IGN] Turquie[Termes IGN] valeur économique[Termes IGN] visualisation 3D Résumé : (auteur) In Turkey, calculation of the factors affecting the value of the condominium units of a building via 2D architectural project data leads to problems. One of the biggest problem is the land share calculation. The aim of this study was to establish a mechanism by which the properties of the factors affecting the value can be determined mathematically and to arrive at a value-based land share. For this purpose, the study utilized a 3D virtual Building Information Modelling (BIM) model. The value factors and weights were determined via a questionnaire, 3D BIM model of the structure was created, metric values of the factors were calculated and the nominal values of the condominium units were calculated. This study demonstrate that a building nonexistent in the real world can be represented in a virtual environment and comparable information source can be presented to the expert who will carry out the valuation process. Numéro de notice : A2022-354 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00396265.2021.1905251 Date de publication en ligne : 02/04/2021 En ligne : https://doi.org/10.1080/00396265.2021.1905251 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100552 A GIS representation framework for location-based social media activities
A GIS representation framework for location-based social media activities [Article/Communication] / Xuebin Wei, Auteur ; Xiaobai Yao, Auteur . - 2022 . - pp 1444 - 1464.bibliographieLangues : Anglais (eng)in Transactions in GIS > vol 26 n° 3 (May 2022) . - pp 1444 - 1464Descripteur : [Vedettes matières IGN] Géomatique web[Termes IGN] cadre conceptuel[Termes IGN] données issues des réseaux sociaux[Termes IGN] environnement géographique virtuel[Termes IGN] Facebook[Termes IGN] modèle conceptuel de données spatio-temporelles[Termes IGN] ontologie[Termes IGN] relations sociales[Termes IGN] représentation des données[Termes IGN] réseau social géodépendant[Termes IGN] système d'information géographique[Termes IGN] Time-geography Résumé : (auteur) The past couple of decades have witnessed tremendous growth of location-based social media activities (LBSMA) data in virtual spaces, including virtual geographic environments. Such data become innovative resources for the analysis of human activities. Meanwhile, a shift of human interactions from geographical spaces to virtual spaces has been observed. Although this is an exciting research opportunity, it also imposes significant challenges on GIScience, as current GIS representation models are no longer sufficient to handle the increased sophistication of human activities data. This research formalizes an ontology for LBSMA data and a conceptual framework for representing such data in GIS. The framework contributes to GIScience as it enables interconnections of human activities in both the physical and virtual worlds to be represented, organized, retrieved, analyzed, and visualized. The proposed GIS representation model integrates a social dimension into the existing spatial–temporal representation models and allows data analysis in the spatial–temporal–social (STS) dimensions. The research tested this conceptual framework with a prototype and a case study using Facebook data. The prototype and the case study prove that the proposed framework can significantly enhance GIS capabilities for data organization, retrieval, and analysis of LBSMA data in STS dimensions. Numéro de notice : A2022-477 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/SOCIETE NUMERIQUE Nature : Article DOI : 10.1111/tgis.12929 Date de publication en ligne : 02/05/2022 En ligne : https://doi.org/10.1111/tgis.12929 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100825 Constraint-based evaluation of map images generalized by deep learning
Constraint-based evaluation of map images generalized by deep learning [Article/Communication] / Azelle Courtial, Auteur ; Guillaume Touya, Auteur ; Xiang Zhang, Auteur . - 2022 . - n° 13.bibliographieLangues : Anglais (eng)in Journal of Geovisualization and Spatial Analysis > vol 6 n° 1 (June 2022) . - n° 13Descripteur : [Termes IGN] apprentissage profond[Termes IGN] connexité (graphes)[Termes IGN] données d'entrainement (apprentissage automatique)[Termes IGN] montagne[Termes IGN] programmation par contraintes[Termes IGN] qualité des données[Termes IGN] rendu réaliste[Termes IGN] route[Vedettes matières IGN] Généralisation Résumé : (auteur) Deep learning techniques have recently been experimented for map generalization. Although promising, these experiments raise new problems regarding the evaluation of the output images. Traditional map generalization evaluation cannot directly be applied to the results in a raster format. Additionally, the internal evaluation used by deep learning models is mostly based on the realism of images and the accuracy of pixels, and none of these criteria is sufficient to evaluate a generalization process. Finally, deep learning processes tend to hide the causal mechanisms and do not always guarantee a result that follows cartographic principles. In this article, we propose a method to adapt constraint-based evaluation to the images generated by deep learning models. We focus on the use case of mountain road generalization, and detail seven raster-based constraints, namely, clutter, coalescence reduction, smoothness, position preservation, road connectivity preservation, noise absence, and color realism constraints. These constraints can contribute to current studies on deep learning-based map generalization, as they can help guide the learning process, compare different models, validate these models, and identify remaining problems in the output images. They can also be used to assess the quality of training examples. Numéro de notice : A2022-449 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s41651-022-00104-2 Date de publication en ligne : 07/05/2022 En ligne : http://dx.doi.org/10.1007/s41651-022-00104-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100646 Adaptive transfer of color from images to maps and visualizations
Adaptive transfer of color from images to maps and visualizations [Article/Communication] / Mingguang Wu, Auteur ; Yanjie Sun, Auteur ; Yaqian Li, Auteur . - 2022 . - pp 289 - 312.bibliographieLangues : Anglais (eng)in Cartography and Geographic Information Science > Vol 49 n° 4 (July 2022) . - pp 289 - 312Descripteur : [Termes IGN] amélioration des couleurs[Termes IGN] couleur (rédaction cartographique)[Termes IGN] données vectorielles[Termes IGN] esthétique cartographique[Termes IGN] orthoimage couleur[Termes IGN] relation sémantique[Termes IGN] saillance[Termes IGN] visualisation cartographique[Vedettes matières IGN] Géovisualisation Résumé : (auteur) Because crafting attractive and effective colors from scratch is a high-effort and time-consuming process in map and visualization design, transferring color from an inspiration source to maps and visualizations is a promising technique for both novices and experts. To date, existing image-to-image color transfer methods suffer from ambiguities and inconsistencies; no computational approach is available to transfer color from arbitrary images to vector maps. To fill this gap, we propose a computational method that transfers color from arbitrary images to a vector map. First, we classify reference images into regions with measures of saliency. Second, we quantify the communicative quality and esthetics of colors in maps; we then transform the problem of color transfer into a dual-objective, multiple-constraint optimization problem. We also present a solution method that can create a series of optimal color suggestions and generate a communicative quality-esthetic compromise solution. We compare our method with an image-to-image method based on two sample maps and six reference images. The results indicate that our method is adaptive to mapping scales, themes, and regions. The evaluation also provides preliminary evidence that our method can achieve better communicative quality and harmony. Numéro de notice : A2022-478 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/15230406.2021.1982009 Date de publication en ligne : 10/11/2021 En ligne : https://doi.org/10.1080/15230406.2021.1982009 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100826 Interactive visual analytics of moving passenger flocks using massive smart card data
Interactive visual analytics of moving passenger flocks using massive smart card data [Article/Communication] / Tong Zhang, Auteur ; Wei He, Auteur ; Jing Huang, Auteur ; et al., Auteur . - 2022 . - pp 354 - 369.bibliographieLangues : Anglais (eng)in Cartography and Geographic Information Science > Vol 49 n° 4 (July 2022) . - pp 354 - 369Descripteur : [Termes IGN] analyse spatiale[Termes IGN] analyse visuelle[Termes IGN] carte à puce[Termes IGN] données massives[Termes IGN] mobilité urbaine[Termes IGN] objet mobile[Termes IGN] Shenzhen[Termes IGN] trajet (mobilité)[Vedettes matières IGN] Géovisualisation Résumé : (auteur) Understanding urban mobility patterns is constrained by our limited capabilities to extract and visualize spatio-temporal regularities from large amounts of mobility data. Moving flocks, defined as groups of people traveling along over a pre-defined time duration, can reveal collective moving patterns at aggregated spatio-temporal scales, thereby facilitating the discovery of urban mobility structure and travel demand patterns. In this study, we extend classical trajectory-oriented flock mining algorithms to discover moving flocks of transit passengers, accounting for the constraints of multi-modal transit networks. We develop a map-centered visual analytics approach by integrating the flock mining algorithm with interactive visualization designs of discovered flocks. Novel interactive visualizations are designed and implemented to support the exploration and analyses of discovered moving flocks at different spatial and temporal scales. The visual analytics approach is evaluated using a real-world smart card dataset collected in Shenzhen City, China, validating its applicability in capturing and mapping dynamic mobility patterns over a large metropolitan area. Numéro de notice : A2022-480 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/15230406.2022.2039775 Date de publication en ligne : 09/03/2022 En ligne : https://doi.org/10.1080/15230406.2022.2039775 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100886 Visualising post-disaster damage on maps: a user study
Visualising post-disaster damage on maps: a user study [Article/Communication] / Thomas Candela, Auteur ; Matthieu Péroche, Auteur ; Arnaud Sallaberry, Auteur ; et al., Auteur . - 2022 . - pp 1364 - 1393.bibliographieLangues : Anglais (eng)in International journal of geographical information science IJGIS > vol 36 n° 7 (juillet 2022) . - pp 1364 - 1393Descripteur : [Termes IGN] carte de répartition par points[Termes IGN] catastrophe naturelle[Termes IGN] comportement[Termes IGN] dommage matériel[Termes IGN] enquête[Termes IGN] lecture de carte[Termes IGN] oculométrie[Termes IGN] psychologie cognitive[Termes IGN] représentation cartographique[Termes IGN] sémiologie graphique[Termes IGN] tessellation[Vedettes matières IGN] Géovisualisation Résumé : (auteur) The mapping of the damage caused by natural disasters is a crucial step in deciding on the actions to take at the international, national, and local levels. The large variety of representations that we have observed leads to problems of transfer and variations in analysis. In this article, we propose a representation, Regular Dot map (RD), and we compare it to 4 others routinely used to visualise post-disaster damage. Our comparison is based on a user study in which a set of participants carried out various tasks on multiple datasets using the various visualisations. We then analysed the behaviour during the experiment using three approaches: (1) quantitative analysis of user answers according to the reality on the ground, (2) quantitative analysis of user preferences in terms of perceived effectiveness and appearance, and (3) qualitative analysis of the data collected using an eye tracker. The results of this study lead us to believe that RD is the best compromise in terms of effectiveness among the various representations studied. Numéro de notice : A2022-492 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2022.2063872 Date de publication en ligne : 19/04/2022 En ligne : https://doi.org/10.1080/13658816.2022.2063872 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100971 Temporal transitions of demographic dot maps
Temporal transitions of demographic dot maps [Article/Communication] / Jeff Allen, Auteur . - 2022 . - pp 208 - 222.bibliographieLangues : Anglais (eng)in International journal of cartography > vol 8 n° 2 (July 2022) . - pp 208 - 222Descripteur : [Termes IGN] analyse spatio-temporelle[Termes IGN] carte de répartition par points[Termes IGN] carte interactive[Termes IGN] distribution spatiale[Termes IGN] données démographiques[Termes IGN] données localisées historiques[Termes IGN] interpolation linéaire[Termes IGN] pauvreté[Termes IGN] population[Termes IGN] répartition géographique[Termes IGN] représentation cartographique[Termes IGN] représentation du changement[Termes IGN] Toronto[Termes IGN] visualisation cartographique[Vedettes matières IGN] Géovisualisation Résumé : (auteur) Dot maps are often used to display the distributions of populations over space. This paper details a method for extending dot maps in order to visualize changes in spatial patterns over time. Specifically, we outline a selective linear interpolation procedure to encode the time range in which dots are visible on a map, which then allows for temporal queries and animation. This methodology is exemplified first by animating population growth across the United States, and second, through an interactive application showing changing poverty distributions in Toronto, Canada. Numéro de notice : A2022-920 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/23729333.2021.1910184 Date de publication en ligne : 18/05/2021 En ligne : https://doi.org/10.1080/23729333.2021.1910184 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102460 Experiencing virtual geographic environment in urban 3D participatory e-planning: A user perspective
Experiencing virtual geographic environment in urban 3D participatory e-planning: A user perspective [Article/Communication] / Thibaud Chassin, Auteur ; Jens Ingensand, Auteur ; Sidonie Christophe, Auteur ; Guillaume Touya, Auteur . - 2022 . - n° 104432.bibliographie This study was partly funded by the Computers & Geosciences Research Scholarships co-sponsored by Elsevier and the International Association for Mathematical Geosciences (IAMG).Langues : Anglais (eng)in Landscape and Urban Planning > vol 224 (August 2022) . - n° 104432Descripteur : [Vedettes matières IGN] Géomatique[Termes IGN] approche participative[Termes IGN] cognition[Termes IGN] environnement géographique virtuel[Termes IGN] projet urbain[Termes IGN] urbanisme[Termes IGN] utilisateur[Termes IGN] visualisation 3D Résumé : (auteur) The adoption of technology in urban participatory planning with tools such as Virtual Geographic Environments (VGE) promises a broader engagement of urban dwellers, which should ultimately lead to the creation of better cities. However, the authorities and urban experts show hesitancy in endorsing these tools in their practices. Indeed, several parameters must be wisely considered in the design of VGE; if misjudged, their impact could be damaging for the participatory approach and the related urban project. The objective of this study is to engage participants (N = 107) with common tasks conducted in participatory sessions, in order to evaluate the users’ performance when manipulating a VGE. We aimed at assessing three crucial parameters: (1) the VGE representation, (2) the participants’ idiosyncrasies, and (3) the nature of the VGE format. The results demonstrate that the parameters did not affect the same aspect of users’ performance in terms of time, inputs, and correctness. The VGE representation impacts only the time needed to fulfill a task. The participants’ idiosyncrasies, namely age, gender and frequency of 3D use also induce an alteration in time, but spatial abilities seem to impact all characteristics of users’ performance, including correctness. Lastly, the nature of the VGE format significantly alters the time and correctness of users interactions. The results of this study highlight concerns about the inadequacies of the current VGE practices in participatory sessions. Moreover, we suggest guidelines to improve the design of VGE, which could enhance urban participatory planning processes, in order to create better cities. Numéro de notice : A2022-439 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE/INFORMATIQUE/URBANISME Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.landurbplan.2022.104432 Date de publication en ligne : 18/04/2022 En ligne : https://doi.org/10.1016/j.landurbplan.2022.104432 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100758 A multi-source spatio-temporal data cube for large-scale geospatial analysis
A multi-source spatio-temporal data cube for large-scale geospatial analysis [Article/Communication] / Fan Gao, Auteur ; Peng Yue, Auteur ; Zhipeng Cao, Auteur ; et al., Auteur . - 2022 . - pp 1853 - 1884.bibliographieLangues : Anglais (eng)in International journal of geographical information science IJGIS > vol 36 n° 9 (September 2022) . - pp 1853 - 1884Descripteur : [Vedettes matières IGN] Analyse spatiale[Termes IGN] cube espace-temps[Termes IGN] cyberinfrastructure[Termes IGN] données spatiotemporelles[Termes IGN] Géocube[Termes IGN] hypercube[Termes IGN] informatique en nuage[Termes IGN] intelligence artificielle[Termes IGN] observation de la Terre Résumé : (auteur) Data management and analysis are challenging with big Earth observation (EO) data. Expanding upon the rising promises of data cubes for analysis-ready big EO data, we propose a new geospatial infrastructure layered over a data cube to facilitate big EO data management and analysis. Compared to previous work on data cubes, the proposed infrastructure, GeoCube, extends the capacity of data cubes to multi-source big vector and raster data. GeoCube is developed in terms of three major efforts: formalize cube dimensions for multi-source geospatial data, process geospatial data query along these dimensions, and organize cube data for high-performance geoprocessing. This strategy improves EO data cube management and keeps connections with the business intelligence cube, which provides supplementary information for EO data cube processing. The paper highlights the major efforts and key research contributions to online analytical processing for dimension formalization, distributed cube objects for tiles, and artificial intelligence enabled prediction of computational intensity for data cube processing. Case studies with data from Landsat, Gaofen, and OpenStreetMap demonstrate the capabilities and applicability of the proposed infrastructure. Numéro de notice : A2022-643 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2022.2087222 Date de publication en ligne : 14/06/2022 En ligne : https://doi.org/10.1080/13658816.2022.2087222 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101458 Improving deep learning on point cloud by maximizing mutual information across layers
Improving deep learning on point cloud by maximizing mutual information across layers [Article/Communication] / Di Wang, Auteur ; Lulu Tang, Auteur ; Xu Wang, Auteur ; et al., Auteur . - 2022 . - n° 108892.bibliographieLangues : Anglais (eng)in Pattern recognition > vol 131 (November 2022) . - n° 108892Descripteur : [Vedettes matières IGN] Traitement d'image optique[Termes IGN] apprentissage profond[Termes IGN] classification par réseau neuronal convolutif[Termes IGN] détection d'objet[Termes IGN] entropie de Shannon[Termes IGN] information sémantique[Termes IGN] segmentation sémantique[Termes IGN] semis de points[Termes IGN] transformation géométrique[Termes IGN] vision par ordinateur[Termes IGN] visualisation 3D Résumé : (auteur) It is a fundamental and vital task to enhance the perception capability of the point cloud learning network in 3D machine vision applications. Most existing methods utilize feature fusion and geometric transformation to improve point cloud learning without paying enough attention to mining further intrinsic information across multiple network layers. Motivated to improve consistency between hierarchical features and strengthen the perception capability of the point cloud network, we propose exploring whether maximizing the mutual information (MI) across shallow and deep layers is beneficial to improve representation learning on point clouds. A novel design of Maximizing Mutual Information (MMI) Module is proposed, which assists the training process of the main network to capture discriminative features of the input point clouds. Specifically, the MMI-based loss function is employed to constrain the differences of semantic information in two hierarchical features extracted from the shallow and deep layers of the network. Extensive experiments show that our method is generally applicable to point cloud tasks, including classification, shape retrieval, indoor scene segmentation, 3D object detection, and completion, and illustrate the efficacy of our proposed method and its advantages over existing ones. Our source code is available at https://github.com/wendydidi/MMI.git. Numéro de notice : A2022-780 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : https://doi.org/10.1016/j.patcog.2022.108892 Date de publication en ligne : 08/07/2022 En ligne : https://doi.org/10.1016/j.patcog.2022.108892 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101859 Where do people look at during multi-scale map tasks? (2023)
Where do people look at during multi-scale map tasks? [Article/Communication] / Laura Wenclik, Auteur ; Guillaume Touya, Auteur . - Göttingen : Copernicus publications, 2023 . - n° 51; 7 p.. - (AGILE GIScience Series; vol 4) .BibliographieLangues : Anglais (eng)Descripteur : [Termes IGN] carte interactive[Termes IGN] oculométrie[Termes IGN] point de repère[Termes IGN] translation[Termes IGN] visualisation multiéchelle[Termes IGN] zoom[Vedettes matières IGN] Géovisualisation Résumé : (Auteur) In order to design better pan-scalar maps, i.e. interactive, zoomable, multi-scale maps, we need to understand how they are perceived, understood, processed, manipulated by the users. This paper reports an experiment that uses an eye-tracker to analyse the gaze behaviour of users zooming and panning into a pan-scalar map. The gaze data from the experiment shows how people look at landmarks to locate the new map view after a zoom. We also identified different types of behaviours during a zoom when people stare at the mouse cursor, or during a pan where the gaze follows a landmark while the map translates. Numéro de notice : C2023-009 Affiliation des auteurs : UGE-LASTIG (2020- ) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/agile-giss-4-51-2023 Date de publication en ligne : 06/06/2023 En ligne : https://doi.org/10.5194/agile-giss-4-51-2023 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103303 - Création d’un graphe de connaissances géohistorique à partir d’annuaires du commerce parisien du 19ème siècle : application aux métiers de la photographie [Article/Communication] / Solenn Tual, Auteur ; Nathalie Abadie, Auteur ; Bertrand Duménieu, Auteur ; Joseph Chazalon, Auteur ; Edwin Carlinet, Auteur . - Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-), 2023.bibliographieLangues : Français (fre)
Descripteur : [Vedettes matières IGN] Analyse spatiale[Termes IGN] analyse spatio-temporelle[Termes IGN] bruit (théorie du signal)[Termes IGN] entité géographique[Termes IGN] réseau sémantique[Termes IGN] visualisation 4D Index. décimale : 37.20 Analyse spatiale et ses outils Résumé : (auteur) Les annuaires professionnels anciens, édités à un rythme soutenu dans de nombreuses villes européennes tout au long des XIXe et XXe siècles, forment un corpus de sources unique par son volume et la possibilité qu'ils donnent de suivre les transformations urbaines à travers le prisme des activités professionnelles des habitants, de l'échelle individuelle jusqu'à celle de la ville entière. L'analyse spatiotemporelle d'un type de commerces au travers des entrées d'annuaires demande cependant un travail considérable de recensement, de transcription et de recoupement manuels. Pour pallier cette difficulté, cet article propose une approche automatique pour construire et visualiser un graphe de connaissances géohistorique des commerces figurant dans des annuaires anciens. L'approche est testée sur des annuaires du commerce parisien du XIXe siècle allant de 1799 à 1908, sur le cas des métiers de la photographie. Numéro de notice : C2023-012 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://hal.science/hal-04121643 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103319 Sensing urban soundscapes from street view imagery
Sensing urban soundscapes from street view imagery [Article/Communication] / Tianhong Zhao, Auteur ; Xiucheng Liang, Auteur ; Wei Tu, Auteur ; et al., Auteur . - 2023 . - n° 101915.bibliographieLangues : Anglais (eng)in Computers, Environment and Urban Systems > vol 99 (January 2023) . - n° 101915Descripteur : [Termes IGN] apprentissage profond[Termes IGN] bruit (audition)[Termes IGN] distribution spatiale[Termes IGN] image Streetview[Termes IGN] paysage sonore[Termes IGN] planification urbaine[Termes IGN] pollution acoustique[Termes IGN] Shenzhen[Termes IGN] Singapour[Termes IGN] ville durable[Vedettes matières IGN] Géovisualisation Résumé : (auteur) A healthy acoustic environment is an essential component of sustainable cities. Various noise monitoring and simulation techniques have been developed to measure and evaluate urban sounds. However, sensing large areas at a fine resolution remains a great challenge. Based on machine learning, we introduce a new application of street view imagery — estimating large-area high-resolution urban soundscapes, investigating the premise that we can predict and characterize soundscapes without laborious and expensive noise measurements. First, visual features are extracted from street-level imagery using computer vision. Second, fifteen soundscape indicators are identified and a survey is conducted to gauge them solely from images. Finally, a prediction model is constructed to infer the urban soundscape by modeling the non-linear relationship between them. The results are verified with extensive field surveys. Experiments conducted in Singapore and Shenzhen using half a million images affirm that street view imagery enables us to sense large-scale urban soundscapes with low cost but high accuracy and detail, and provides an alternative means to generate soundscape maps. reaches 0.48 by evaluating the predicted results with field data collection. Further novelties in this domain are revealing the contributing visual elements and spatial laws of soundscapes, underscoring the usability of crowdsourced data, and exposing international patterns in perception. Numéro de notice : A2023-014 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/IMAGERIE Nature : Article DOI : 10.1016/j.compenvurbsys.2022.101915 Date de publication en ligne : 20/11/2022 En ligne : https://doi.org/10.1016/j.compenvurbsys.2022.101915 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102131 - How does the design of landmarks on a mobile map influence wayfinding experts’ spatial learning during a real-world navigation task? [Article/Communication] / Armand Kapaj, Auteur ; Sara Maggi, Auteur ; Christopher Hilton, Auteur ; et al., Auteur . - 2023 . - pp 197 - 213.bibliographieLangues : Anglais (eng)in Cartography and Geographic Information Science > Vol 50 n° 2 (March 2023) . - pp 197 - 213
Descripteur : [Termes IGN] analyse géovisuelle[Termes IGN] itinéraire[Termes IGN] navigation pédestre[Termes IGN] oculométrie[Termes IGN] orientation[Termes IGN] point de repère[Termes IGN] raisonnement spatial[Termes IGN] représentation cartographique[Termes IGN] représentation mentale spatiale[Vedettes matières IGN] Géovisualisation Résumé : (auteur) Humans increasingly rely on GPS-enabled mobile maps to navigate novel environments. However, this reliance can negatively affect spatial learning, which can be detrimental even for expert navigators such as search and rescue personnel. Landmark visualization has been shown to improve spatial learning in general populations by facilitating object identification between the map and the environment. How landmark visualization supports expert users’ spatial learning during map-assisted navigation is still an open research question. We thus conducted a real-world study with wayfinding experts in an unknown residential neighborhood. We aimed to assess how two different landmark visualization styles (abstract 2D vs. realistic 3D buildings) would affect experts’ spatial learning in a map-assisted navigation task during an emergency scenario. Using a between-subjects design, we asked Swiss military personnel to follow a given route using a mobile map, and to identify five task-relevant landmarks along the route. We recorded experts’ gaze behavior while navigating and examined their spatial learning after the navigation task. We found that experts’ spatial learning improved when they focused their visual attention on the environment, but the direction of attention between the map and the environment was not affected by the landmark visualization style. Further, there was no difference in spatial learning between the 2D and 3D groups. Contrary to previous research with general populations, this study suggests that the landmark visualization style does not enhance expert navigators’ navigation or spatial learning abilities, thus highlighting the need for population-specific mobile map design solutions. Numéro de notice : A2023-222 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/15230406.2023.2183525 Date de publication en ligne : 07/03/2023 En ligne : https://doi.org/10.1080/15230406.2023.2183525 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103168 A spatiotemporal data model and an index structure for computational time geography
A spatiotemporal data model and an index structure for computational time geography [Article/Communication] / Bi Yu Chen, Auteur ; Yu-Bo Luo, Auteur ; Tao Jia, Auteur ; et al., Auteur . - 2023 . - pp 550 - 583.bibliographieLangues : Anglais (eng)in International journal of geographical information science IJGIS > vol 37 n° 3 (March 2023) . - pp 550 - 583Descripteur : [Vedettes matières IGN] Géomatique[Termes IGN] approche hiérarchique[Termes IGN] données massives[Termes IGN] données spatiotemporelles[Termes IGN] modèle conceptuel de données spatio-temporelles[Termes IGN] requête spatiotemporelle[Termes IGN] stockage de données[Termes IGN] Time-geography Résumé : (auteur) The availability of Spatiotemporal Big Data has provided a golden opportunity for time geographical studies that have long been constrained by the lack of individual-level data. However, how to store, manage, and query a huge number of time geographic entities effectively and efficiently with complex spatiotemporal characteristics and relationships poses a significant challenge to contemporary GIS platforms. In this article, a hierarchical compressed linear reference (CLR) model is proposed to transform network-constrained time geographic entities from three-dimensional (3D) (x, y, t) space into two-dimensional (2D) space. Accordingly, time geographic entities can be represented as 2D spatial entities and stored in a classical spatial database. The proposed CLR model supports a hierarchical linear reference system (LRS) including not only underlying a link-based LRS but also multiple higher-level route-based LRSs. In addition, an LRS-based spatiotemporal index structure is developed to index both time geographic entities and the corresponding hierarchical network. The results of computational experiments on large datasets of space–time paths and prisms show that the proposed hierarchical CLR model is effective at storing and managing time geographic entities in road networks. The developed index structure achieves satisfactory query performance in milliseconds on large datasets of time geographic entities. Numéro de notice : A2023-153 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2022.2128192 Date de publication en ligne : 03/10/2023 En ligne : https://doi.org/10.1080/13658816.2022.2128192 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102836 Assessing the cognition of movement trajectory visualizations: interpreting speed and direction
Assessing the cognition of movement trajectory visualizations: interpreting speed and direction [Article/Communication] / Crystal J. Bae, Auteur ; Somayeh Dodge, Auteur . - 2023 . - pp 143 - 161.bibliographieLangues : Anglais (eng)in Cartography and Geographic Information Science > Vol 50 n° 2 (March 2023) . - pp 143 - 161Descripteur : [Termes IGN] analyse visuelle[Termes IGN] cognition[Termes IGN] compréhension de l'image[Termes IGN] données spatiotemporelles[Termes IGN] objet mobile[Termes IGN] visualisation cartographique[Vedettes matières IGN] Géovisualisation Résumé : (auteur) This paper evaluates cognitively plausible geovisualization techniques for mapping movement data. With the widespread increase in the availability and quality of space-time data capturing movement trajectories of individuals, meaningful representations are needed to properly visualize and communicate trajectory data and complex movement patterns using geographic displays. Many visualization and visual analytics approaches have been proposed to map movement trajectories (e.g. space-time paths, animations, trajectory lines, etc.). However, little is known about how effective these complex visualizations are in capturing important aspects of movement data. Given the complexity of movement data which involves space, time, and context dimensions, it is essential to evaluate the communicative efficiency and efficacy of various visualization forms in helping people understand movement data. This study assesses the effectiveness of static and dynamic movement displays as well as visual variables in communicating movement parameters along trajectories, such as speed and direction. To do so, a web-based survey is conducted to evaluate the understanding of movement visualizations by a nonspecialist audience. This and future studies contribute fundamental insights into the cognition of movement visualizations and inspire new methods for the empirical evaluation of geovisualizations. Numéro de notice : A2023-221 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/15230406.2022.2157879 Date de publication en ligne : 23/01/2023 En ligne : https://doi.org/10.1080/15230406.2022.2157879 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103167 Automatic generation of outline-based representations of landmark buildings with distinctive shapes
Automatic generation of outline-based representations of landmark buildings with distinctive shapes [Article/Communication] / Peng Ti, Auteur ; Tao Xiong, Auteur ; Yuhong Qiu, Auteur ; et al., Auteur . - 2023 . - pp 864 - 884.BibliographieLangues : Anglais (eng)in International journal of geographical information science IJGIS > vol 37 n° 4 (April 2023) . - pp 864 - 884Descripteur : [Termes IGN] Bâti-3D[Termes IGN] cartographie[Termes IGN] contour[Termes IGN] détection du bâti[Termes IGN] extraction de traits caractéristiques[Termes IGN] raisonnement spatial[Termes IGN] reconnaissance de formes[Termes IGN] segmentation d'image[Termes IGN] sémiologie graphique[Vedettes matières IGN] Géovisualisation Résumé : (auteur) Landmark buildings are salient features for spatial cognition on maps. Distinctive outlines are the major visual characteristics that separate landmark buildings from their surrounding environments. The automatic symbolization of landmark outlines facilitates recognition and map production. As users often recognize landmarks by the outlines of their façades from a street view, this study proposes an automatic method for automatically generating representations of the outlines of landmark buildings in four steps: (1) extract outlines from street-view photographs using GrabCut method, (2) vectorize the extracted building outlines, (3) simplify outline shapes, and (4) symbolize the simplified building outlines in three dimensions (3D). We used the proposed method to generate test data with symbolized outlines for eight buildings in a real-world environment for a wayfinding experiment in which the subjects used the building representations to identify landmark buildings and evaluated their perception of the generated maps. The subjects successfully recognized these buildings based on the symbolized outlines on a map, expressed satisfaction with the manually generated 3D symbols, and reported the same or similar ease of building recognition using 2D or 3D symbolized outlines. Numéro de notice : A2023-207 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2022.2143503 Date de publication en ligne : 11/11/2022 En ligne : https://doi.org/10.1080/13658816.2022.2143503 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103109
