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Jahresbericht 2020 des Bundesamtes für Kartographie und Geodäsie / Bundesamt für Kartographie und Geodäsie (2021)
Titre : Jahresbericht 2020 des Bundesamtes für Kartographie und Geodäsie Titre original : Annual report 2020 Federal Agency for Cartography and Geodesy Type de document : Rapport Auteurs : Bundesamt für Kartographie und Geodäsie, Auteur Editeur : Francfort sur le Main : Bundesamt für Kartographie und Geodäsie Année de publication : 2021 Importance : 44 p. Format : 21 x 30 cm Langues : Allemand (ger) Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie
[Termes IGN] activité cartographique
[Termes IGN] activité géodésique
[Termes IGN] Allemagne
[Termes IGN] base de données localisées
[Termes IGN] géomatique
[Termes IGN] système de référence localNote de contenu : 1 Looking back: This was BKG´s year 2020
2 Facts and figures 2020
3 Geoportal 2.0 – new features, new design
4 A center of excellence for earth changes – coordinated by the BKG!
5 AGGO - Step by step to the flagship observatory
6 The new satellite positioning service for Germany
7 Our passion for collecting in your interest – Points of Interest
8 Where you can find us: Locations and contact detailsNuméro de notice : 17743 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Rapport d'activité DOI : sans En ligne : https://sg.geodatenzentrum.de/web_public/gdz/schriften/BKG-Jahresbericht-2020.pd [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103112 Documents numériques
en open access
rapport 2020 - pdf éditeurAdobe Acrobat PDF
Titre : Model and reality: Connecting BIM and the built environment Type de document : Thèse/HDR Auteurs : Gustaf Uggla, Auteur Editeur : Stockholm : Royal Institute of Technology Année de publication : 2021 Importance : 79 p. Format : 21 x 30 cm Note générale : bibliographie
Doctoral Thesis in Geodesy and Geoinformatics, KTH Royal Institute of Technology, StockholmLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] apprentissage profond
[Termes IGN] classification par réseau neuronal convolutif
[Termes IGN] données d'entrainement (apprentissage automatique)
[Termes IGN] données localisées 3D
[Termes IGN] format d'échange
[Termes IGN] format Industry foudation classes IFC
[Termes IGN] géoréférencement
[Termes IGN] métadonnées
[Termes IGN] modélisation 3D du bâti BIM
[Termes IGN] projection Universal Transverse Mercator
[Termes IGN] qualité des données
[Termes IGN] segmentation sémantique
[Termes IGN] semis de pointsIndex. décimale : THESE Thèses et HDR Résumé : (auteur) The adoption of building information modeling (BIM) in the architecture, engineering, and construction (AEC) industry is changing the way information regarding the built environment is created, stored, and exchanged. In short, documents are replaced with databases, processes are automated, and timelines become more circular with an emphasis on managing the life cycles of all manufactured objects. This has both direct and indirect consequences for the fields of geodesy and geographic information. Although geodesy and surveying have played a vital role in the construction process for a long time, new data standards and higher degrees of prefabrication and automation in the actual construction means that the topic of georeferencing must be revisited. In addition, using object oriented data structures means that semantic information must be inferred from geodata such as point clouds and images in order to adequately document existing assets. This thesis addresses the handling of 3D spatial information by analyzing different georeferencing methods and metadata used to describe the quality and characteristics of geodata. The outcomes include a recommendation for how the open BIM standard Industry Foundation Classes (IFC) could be extended to support more robust georeferencing, a suggestion that all standards and exchange formats used forthe built environment should include metadata for tolerance and uncertainty, and a framework that can describe characteristics of 3D spatial data that are not covered by conventional geographic metadata. On the semantic side, this thesis proposes an image-based method for identifying roadside objects in mobile laser scanning (MLS) point clouds, and it also explores the possibilities to train neural networks for point cloud segmentation by creating training data from 3D mesh models used in infrastructure design. Overall, the thesis describes the connection between model and reality, the importance of geodesy and geodetic surveying in this context, and makes contributions to both the geometric and semantic aspects of modeling the built environment. Note de contenu : 1- Introduction
2- Basis of knowledge and methods
3- Results
4- Summary of papersNuméro de notice : 28668 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/IMAGERIE Nature : Thèse étrangère Note de thèse : PhD Thesis : Geodesy and Geoinformatics : KTH, Stockholm : 2021 DOI : sans En ligne : http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-294087 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=99878 Model based signal processing techniques for nonconventional optical imaging systems / Daniele Picone (2021)
Titre : Model based signal processing techniques for nonconventional optical imaging systems Type de document : Thèse/HDR Auteurs : Daniele Picone, Auteur ; Mauro Dalla Mura, Directeur de thèse Editeur : Grenoble [France] : Université Grenoble Alpes Année de publication : 2021 Importance : 364 p. Format : 21 x 30 cm Note générale : bibliographie
Thèse pour obtenir le grade de Docteur de l'Université Grenoble Alpes, spécialité : Signal Image Parole TélécomsLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] acquisition comprimée
[Termes IGN] fusion d'images
[Termes IGN] image hyperspectrale
[Termes IGN] inférence statistique
[Termes IGN] interférométrie
[Termes IGN] méthode du maximum de vraisemblance (estimation)
[Termes IGN] mosaïque d'images
[Termes IGN] pouvoir de résolution géométrique
[Termes IGN] pouvoir de résolution spectrale
[Termes IGN] problème inverse
[Termes IGN] reconstruction d'image
[Termes IGN] régression non linéaire
[Termes IGN] spectromètre imageur
[Termes IGN] traitement du signalIndex. décimale : THESE Thèses et HDR Résumé : (auteur) There is an increasing demand for images with higher spectral and spatial resolution for applications in several domains such as health, environment, quality checking and natural disasters monitoring. Hyperspectral imagery provides the necessary spectral diversity to recover the composition of materials on site for applications such as the detection of fires, anomalies, chemical agents, targets and changes in the scene.The requirement for cheaper and more compact devices (e.g. to be embarked on low cost satellites and airborne platform) which are capable of capturing this information has led to the development of nonconventional innovative design concepts to overcome the technological limitations of traditional cameras. Data acquired by such novel imaging devices following the computational imaging paradigm are typically not readily exploitable for the final application. A computational phase is hence needed for extracting useful information from the raw acquisitions.This thesis addresses this issue by setting up an inversion problem. The general approach is to characterize the data fidelity term with a physical model, describing the underlying optical transformations performed by the device. The challenge is then shifted on the regularization step to properly characterizes the features of the quantities of interest and improve the accuracy of the estimation, which can be tackled with variational techniques.The analysis is applied to two novel concepts for nonconventional optical devices. The first one is a novel compressed acquisition imaging system based on color filter arrays, which embeds information from sensors with different spatial and spectral characteristics into a single mosaiced product. As opposed to existing compressed sensing based devices, the goal is not to recover the original uncompressed multiresolution sources, but instead to directly recover a synthetic fused image with both high spatial and spectral resolution.The proposed solution relies on the total variation regularization and is the subject of a detailed analysis, comparing its compressive power with straightforward software alternatives, evaluating its performances as the amount of channels changes, and validating its efficiency in comparison to state of the art methods when applied to classical fusion or mosaicing algorithms separately.The second class of devices is based on the ImSPOC patent, a design concept for a low finesse snapshot imaging spectrometer based on the interferometry of Fabry-Pérot. Its ideal behaviour follows the principle of the Fourier Transform Spectroscopy, as its acquisition can be interpreted as a sampled version of an interferogram, arranged across different sub-images distributed on the same focal plane.After defining a physical model based on optical geometry, its validity is evaluated over real acquisitions by setting up a Bayesian inference problem to determine its parameters, with approaches based on maximum likelihood estimators, regular-grid searches and nonlinear regression.A variety of preliminary tests are then carried out on the inversion method, with approaches based on singular value decomposition and sparse-inducing regularizers, accompanied by a analysis of their robustness to model mismatches. Note de contenu : 1- Introduction
2- Inverse problems theory
3- Signal processing of multimodal data
4- Joint fusion and demosaicing of compressed multiresolution acquisitions
5- Optics foundations for the ImSPOC acquisition system
6- Data processing pipeline of ImSPOC acquisitions
7- ConclusionsNuméro de notice : 28691 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse française Note de thèse : Thèse de Doctorat : Signal Image Parole Télécoms : Grenoble : 2021 Organisme de stage : GIPSA-lab DOI : sans En ligne : https://hal.science/tel-03596486v1 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100170 Modeling multifrequency GPS multipath fading in land vehicle environments / Vicente Carvalho Lima Filho in GPS solutions, vol 25 n° 1 (January 2021)
[article]
Titre : Modeling multifrequency GPS multipath fading in land vehicle environments Type de document : Article/Communication Auteurs : Vicente Carvalho Lima Filho, Auteur ; Alison Moraes, Auteur Année de publication : 2021 Article en page(s) : 14 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] densité de probabilité
[Termes IGN] interférence
[Termes IGN] propagation du signal
[Termes IGN] qualité du signal
[Termes IGN] signal GPS
[Termes IGN] simulation de signal
[Termes IGN] trajet multiple
[Termes IGN] véhiculeRésumé : (auteur) The reliability and performance of GPS receivers depend on the quality of the signal received, which can be largely affected by the interference caused by buildings, trees, and other obstacles. Since obstacles are always present in practical applications, several statistical representations have been developed along the years to measure, predict, and compensate errors induced by interferences. Two of the most used models to characterize GPS signal fading are the Nakagami-m and Rice, but in this work, we present evidence that supports the κ–μ distribution as the best fit to deal with multifrequency GPS multipath channels inside urban, rural, and forest areas. A synthetic signal simulator was developed to create propagation cases involving scattering clusters and specular reflections. Additionally, experimental measurements are presented to confirm the κ–μ distribution as the best distribution to characterize different situations on the available three GPS frequencies. We then present typical values of fading coefficients in L1, L2C, and L5 signals, for cases involving urban canyons, regular urban, rural, and dense vegetation areas. These coefficients can also be used to evaluate the receiver performance under similar cases or may be applied in weights measurement methods for positioning computation improvement. Numéro de notice : A2021-002 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s10291-020-01040-8 Date de publication en ligne : 09/10/2020 En ligne : https://doi.org/10.1007/s10291-020-01040-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96080
in GPS solutions > vol 25 n° 1 (January 2021) . - 14 p.[article]Le parallèle des Pyrénées / Yves Maugard (2021)
Titre : Le parallèle des Pyrénées : Détermination des hauteurs des sommets ; La comparaison du niveau des deux mers 1825 - 1827 Type de document : Monographie Auteurs : Yves Maugard, Auteur Editeur : Auto-Edition Année de publication : 2021 Importance : 107 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-2-9578363-0-7 Note générale : bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géodésie ancienne
[Termes IGN] altitude
[Termes IGN] dix-neuvième siècle
[Termes IGN] niveau de la mer
[Termes IGN] nivellement
[Termes IGN] parallèle
[Termes IGN] Pyrénées (montagne)
[Termes IGN] triangulationIndex. décimale : 30.01 Géodésie ancienne (postérieure à 1939 et en bon état) Note de contenu : 1- Historique
2- Notions de géodésie et de topographie
3- Opérations géodésiques de 1825 - 1827
4- Nivellement des sites
5- Les calculs
6- Résultats et altitude du Crabère
7- ConclusionNuméro de notice : 28376 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98552 Réservation
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