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Digital surface model generation from high resolution multi-view stereo satellite imagery / Ke Gong in Photogrammetric Engineering & Remote Sensing, PERS, vol 85 n° 5 (May 2019)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 85 n° 5 (May 2019) . - pp 379 - 387 Titre : Digital surface model generation from high resolution multi-view stereo satellite imagery Type de document : Article/Communication Auteurs : Ke Gong, Auteur ; Dieter Fritsch, Auteur Année de publication : 2019 Article en page(s) : pp 379 - 387 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] angle de visée [Termes IGN] Argentine [Termes IGN] chaîne de traitement [Termes IGN] géométrie épipolaire [Termes IGN] image multitemporelle [Termes IGN] image Worldview [Termes IGN] modèle numérique de surface [Termes IGN] semis de points Résumé : (Auteur) Along with improvements to spatial resolution, multiple-view stereo satellite imagery has become a valuable datasource for digital surface model generation. In 2016, a public multi-view stereo benchmark of commercial satellite imag- ery was released by the John Hopkins University Applied Physics Laboratory, USA. Motivated by this well-organized benchmark, we propose a pipeline to process multi-view satellite imagery into digital surface models. Input images are selected based on view angles and capture dates. We apply the relative bias-compensated model for orientation, and then generate the epipolar image pairs. The images are matched by the modified tube-based SemiGlobal Matching method (tSGM). Within the triangulation step, very dense point clouds are produced, and are fused by a median filter to generate the Digital Surface Model (DSM). A comparison with the reference data shows that the fused DSM generated by our pipeline is accurate and robust. Numéro de notice : A2019-440 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.14358/PERS.85.5.379 Date de publication en ligne : 01/05/2019 En ligne : https://doi.org/10.14358/PERS.85.5.379 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92771 [article]

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Cognitive aspects of human-computer interaction for GIS / Dieter Fritsch (2019)  

Public Titre : Cognitive aspects of human-computer interaction for GIS Type de document : Monographie Auteurs : Dieter Fritsch, Éditeur scientifique Editeur : Bâle [Suisse] : Multidisciplinary Digital Publishing Institute MDPI Année de publication : 2019 Importance : 196 p. ISBN/ISSN/EAN : 978-3-03921-569-0 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] Androïd [Termes IGN] base de données statistiques [Termes IGN] carte d'intérieur [Termes IGN] classification par forêts d'arbres décisionnels [Termes IGN] cognition [Termes IGN] état de l'art [Termes IGN] géovisualisation [Termes IGN] informatique en nuage [Termes IGN] interface homme-machine [Termes IGN] IOS [Termes IGN] monde virtuel [Termes IGN] oculométrie [Termes IGN] représentation mentale spatiale [Termes IGN] traitement de données localisées [Termes IGN] visualisation de données Résumé : (éditeur) The book is dealing with recent progress in human–computer interaction (HCI) related to geographic information science (GIS). The Editorial starts with an overview about the evolution of the Internet and first HCI concepts and stimulates recent HCI developments using 3D and 4D apps, running on all mobile devices with OS Android, iOS, Linus, and Windows. Eight research articles present the state-of-the-art in HCI–GIS-related issues, starting with gender and age differences in using indoor maps via the estimation of building heights from space to an efficient visualization method for polygonal data with dynamic simplification. The review article deals with progress and challenges on entity alignment of geographic knowledge bases. Note de contenu : Editorial “Cognitive aspects of human-computer interaction for GIS” 1- Gender and age differences in using indoor maps for wayfinding in real environments 2- Collaborative Immersive Virtual Environments for Education in Geography 3- Evaluation of User Performance in Interactive and Static 3D Maps 4- Determining optimal video length for the estimation of building height through radial displacement measurement from space 5- 4D time density of trajectories: Discovering spatiotemporal patterns in movement data 6- Two-Dimensional Priority R-Tree Algorithm for Spatial Partitioning in SpatialHadoop 7- Estimating the performance of random forest versus multiple regression for predicting prices of the apartments 8- An efficient visualization method for polygonal data with dynamic simplification 9- Progress and challenges on entity alignment of geographic knowledge bases Numéro de notice : 25883 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Monographie DOI : 10.3390/books978-3-03921-569-0 En ligne : https://doi.org/10.3390/books978-3-03921-569-0 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95748

Automatic modeling of building interiors using low-cost sensor systems / Ali Mohammad Khosravani (2016)  

Public Titre : Automatic modeling of building interiors using low-cost sensor systems Type de document : Thèse/HDR Auteurs : Ali Mohammad Khosravani, Auteur ; Dieter Fritsch, Directeur de thèse Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2016 Collection : DGK - C, ISSN 0065-5325 num. 767 Importance : 134 p. ISBN/ISSN/EAN : 978-3-7696-5179-9 Note générale : bibliographie PhD Dissertation Langues : Anglais (eng) Allemand (ger) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] caméra numérique [Termes IGN] carte d'intérieur [Termes IGN] espace image [Termes IGN] espace objet [Termes IGN] Kinect [Termes IGN] modélisation 3D du bâti BIM [Termes IGN] semis de points Résumé : (auteur) Indoor reconstruction or 3D modeling of indoor scenes aims at representing the 3D shape of building interiors in terms of surfaces and volumes, using photographs, 3D point clouds or hypotheses. Due to advances in the range measurement sensors technology and vision algorithms, and at the same time an increased demand for indoor models by many applications, this topic of research has gained growing attention during the last years. The automation of the reconstruction process is still a challenge, due to the complexity of the data collection in indoor scenes, as well as geometrical modeling of arbitrary room shapes, especially if the data is noisy or incomplete. Available reconstruction approaches rely on either some level of user interaction, or making assumptions regarding the scene, in order to deal with the challenges. The presented work aims at increasing the automation level of the reconstruction task, while making fewer assumptions regarding the room shapes, even from the data collected by low-cost sensor systems subject to a high level of noise or occlusions. This is realized by employing topological corrections that assure a consistent and robust reconstruction. This study presents an automatic workflow consisting of two main phases. In the first phase, range data is collected using the affordable and accessible sensor system, Microsoft Kinect. The range data is registered based on features observed in the image space or 3D object space. A new complementary approach is presented to support the registration task in some cases where these registration approaches fail, due to the existence of insufficient visual and geometrical features. The approach is based on the user’s track information derived from an indoor positioning method, as well as an available coarse floor plan. In the second phase, 3D models are derived with a high level of details from the registered point clouds. The data is processed in 2D space (by projecting the points onto the ground plane), and the results are converted back to 3D by an extrusion (room height available from the point height histogram analysis). Data processing and modeling in 2D does not only simplify the reconstruction problem, but also allows for topological analysis using the graph theory. The performance of the presented reconstruction approach is demonstrated for the data derived from different sensors having different accuracies, as well as different room shapes and sizes. Finally, the study shows that the reconstructed models can be used to refine available coarse indoor models which are for instance derived from architectural drawings or floor plans. The refinement is performed by the fusion of the detailed models of individual rooms (reconstructed in a higher level of details by the new approach) to the coarse model. The model fusion also enables the reconstruction of gaps in the detailed model using a new learning-based approach. Moreover, the refinement process enables the detection of changes or details in the original plans, missing due to generalization purposes, or later renovations in the building interiors. Note de contenu : 1. Introduction 1.1. Motivation 1.2. Objectives 1.3. Outline and Design of the Thesis 2. Overview of Indoor Data Collection Techniques 2.1. State-of-the-Art Sensors for 3D Data Collection 2.2. The Registration Problem 3. Data Collection using Microsoft Kinect for Xbox 360 3.1. Point Cloud Collection by Kinect 3.2. Point Clouds Registration 3.3. Kinect SWOT Analysis 4. Overview of Available Indoor Modeling Approaches 4.1. Classification of Available Modeling Approaches 4.2. Iconic Approaches 4.3. Symbolic Approaches 5. Automatic Reconstruction of Indoor Spaces 5.1. Point Cloud Pre-Processing 5.2. Reconstruction of Geometric Models 6. Experimental Results and Analysis 6.1. Kinect System Calibration and Accuracy Analysis 6.2. Evaluation of the Reconstruction Approach 6.3. Quality of the Reconstructed Models 7. Application in the Refinement of Available Coarse Floor Models 7.1. Registration of Individual Detailed Models to an Available Coarse Floor Model 7.2. Fusion of Detailed Models to the Coarse Model 8. Conclusion 8.1. Summary 8.2. Contributions 8.3. Future Work Numéro de notice : 19789 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Note de thèse : PhD Dissertation : Photogrammetry : Stuttgart : 2016 DOI : 10.18419/opus-3988 En ligne : http://doi.org/10.18419/opus-3988 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85007

Crowd-sourced reconstruction of building interiors / Michael Peter (2016)  

Public Titre : Crowd-sourced reconstruction of building interiors Type de document : Thèse/HDR Auteurs : Michael Peter, Auteur ; Dieter Fritsch, Directeur de thèse Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2016 Collection : DGK - C, ISSN 0065-5325 num. 768 Importance : 147 p. ISBN/ISSN/EAN : 978-3-7696-5180-5 Note générale : bibliographie Langues : Anglais (eng) Allemand (ger) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] carte d'intérieur [Termes IGN] cartographie collaborative [Termes IGN] données localisées des bénévoles [Termes IGN] échelle cartographique [Termes IGN] image binaire [Termes IGN] modélisation 2D [Termes IGN] modélisation 3D du bâti BIM [Termes IGN] navigation à l'estime [Termes IGN] numérisation de carte [Termes IGN] plan incendie [Termes IGN] positionnement en intérieur [Termes IGN] segmentation binaire [Termes IGN] squelettisation [Termes IGN] trace GPS Résumé : (auteur) Location-based services (LBS) have gained huge commercial and scientific interest in recent years, due to the ubiquitous and free availability of maps, global positioning systems, and smartphones. To date, maps and positioning solutions are mostly only available for outdoor use. However, humans spend most of their time indoors, rendering indoor LBS interesting for applications such as location-based advertisement, customer tracking and customer flow analysis. Neither of the two prerequisites for indoor LBS - a map of the user's environment and a positioning system - is currently generally available: Most positioning methods currently under scientific investigation are based either on fingerprint maps of electro-magnetic signals (e.g. WiFi) or inertial measurement units. To overcome the flaws of these methods, they are often supported by models for the human movement which in turn rely on indoor maps. Ready-made maps, on the other hand, are generally unavailable due to indoor mapping being mostly manual, expensive and tedious. The vast amount of unmapped indoor space therefore calls for the transfer of methods used by Volunteered Geographic Information (VGI) communities like OpenStreetMap to indoor mapping. These methods comprise the digitization of features of interest such as building outlines from aerial images released to the community and the use of position traces. In this thesis, approaches are illustrated which can serve to enable this transfer. On the one hand, the thesis shows how photographs of evacuation plans - which are a compulsory part of the safety equipment of publicly used buildings in many countries - can substitute for the aerial images in the indoor domain. Due to the standardised nature of such plans, the manual digitization employed by VGI mappers in the outdoor domain can be replaced by an automatic reverse-engineering pipeline. To this end, the image is pre-processed and symbols, which depict evacuation routes or emergency equipment, are detected. Subsequently, foreground objects (i.e. walls) are distinguished from the background using an adequate binarisation operation. Based on the binary image, the sought-after vector information can be extracted by skeletonisation and skeleton tracing. The model is finalised by a bridging operation of the previously detected symbols which occlude parts of walls or stairs. As the model resulting from these operations is only available in a coordinate system defined by the original image, the transformation to a world-coordinate system or, at least, the unknown scale has to be determined. To this end, the indoor model is matched to an available model of the building's external shell. By detection of stairs, an approximate floor height can be computed and the 2D model is extruded to a 3D model. On the other hand, geometric features and semantic annotations may be added to existing models using pedestrian traces recorded by an indoor positioning system. As suitable generally available and low-cost systems do not exist yet, their existence is simulated in this work by a dead-reckoning system basing on a foot-mounted inertial measurement system. Methods for the derivation of the initial position and orientation necessary for the application of such a system are shown, as well as methods enabling the correction of remaining errors. The latter comprise an alignment approach using the external building shell and a map-matching method which employs the existing coarse model derived from the evacuation plan. Building on the collected pedestrian traces, semi-automatic and automatic approaches for the existing models' semantic and geometric refinement are presented which range from semantic annotation using the analysis of photographed doorplates to automatic door reconstruction. Furthermore, a geometric update of single rooms by conjoint analysis of the coarse model, pedestrian traces and a hand-held low-cost range camera is described. Lastly, works of indoor mapping are presented which are based on pedestrian traces and higher-level knowledge about the interior structure of the building modelled in an indoor grammar. Due to the differing characteristics of the two central elements of building interiors, corridors and rooms, the grammar is composed of a Lindenmayer system modelling the floor's corridor system and a split grammar describing the room layout which is found in the non-corridor spaces. The grammar is put to the test by applying it to distributedly collected noisy trace data. Numéro de notice : 19790 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Thèse étrangère Note de thèse : PhD Dissertation : Photogrammetry : Stuttgart : 2016 nature-HAL : Thèse DOI : 10.18419/opus-8729 En ligne : http://doi.org/10.18419/opus-8729 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85009

Photogrammetric Week 2015, 55th week / Dieter Fritsch (2015)  

Public Titre : Photogrammetric Week 2015, 55th week Type de document : Actes de congrès Auteurs : Dieter Fritsch, Éditeur scientifique Editeur : Stuttgart : Institüt für Photogrammetrie der Universität Stuttgart Année de publication : 2015 Conférence : PhoWo 2015, 55th Photogrammetric Week 07/09/2015 11/09/2015 Stuttgart Allemagne OA Proceedings Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie [Termes IGN] acquisition de données [Termes IGN] CityGML [Termes IGN] drone [Termes IGN] géovisualisation [Termes IGN] modélisation 3D [Termes IGN] photogrammétrie métrologique Note de contenu : Introduction Remotely Sensed Data Acquisition - An Update Advanced Modelling in Photogrammetry, Computer Vision and Computer Graphics Excellence in Geoinformatics Numéro de notice : 17275 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Actes DOI : sans En ligne : http://www.ifp.uni-stuttgart.de/publications/phowo15/index.en.html Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82460

Automatische Interpretation von Semantik aus digitalen Karten im World Wide Web / Fen Luo (2014)  

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Correlation analysis of camera self-calibration in close range photogrammetry / Rongfu Tang in Photogrammetric record, vol 28 n° 141 (March - May 2013)  

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Photogrammetric Week '13 [2013], 54th Photogrammetric Week (9 - 13 septembre 2013; Stuttgart, Allemagne) / Dieter Fritsch (2013)  

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A flexible mathematical method for calibration in digital aerial photogrammetry / Rongfu Tang in Photogrammetric Engineering & Remote Sensing, PERS, vol 78 n° 10 (October 2012)  

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New rigorous and flexible Fourier self-calibration models for airborne camera calibration / Rongfu Tang in ISPRS Journal of photogrammetry and remote sensing, vol 71 (July 2012)  

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Towards all-in-one photogrammetry / Dieter Fritsch in GIM international, vol 26 n° 4 (April 2012)

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Photogrammetric week' 2003, Vol 1. Proceedings / Dieter Fritsch (2003)  

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Photogrammetric week' 2003, Vol 2. Tutorium PHOWO 2003 photogrammetry and 3d visualisation, added value and visions / Dieter Fritsch (2003)

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Routing in graphs with forbidden paths / Dieter Fritsch in GIS Geo-Informations-Systeme, vol 2002 n° 6 (Juni 2002)

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Generation of a consistent spatial data base for a land use planning project in south eastern China (SILUP) / Dieter Fritsch in GIS Geo-Informations-Systeme, vol 2002 n° 3 (März2002)

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