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Reconstructing a Mythical Past / Andrew Blogg in GIM international [en ligne], vol 30 n° 3 (March 2016)
[article]
Titre : Reconstructing a Mythical Past Type de document : Article/Communication Auteurs : Andrew Blogg, Auteur Année de publication : 2016 Article en page(s) : pp 33 - 35 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] château
[Termes IGN] drone
[Termes IGN] impression en relief
[Termes IGN] logiciel de reconstruction 3D
[Termes IGN] modèle numérique de terrainRésumé : (éditeur) UAS photogrammetry has been used to create a printed 3D model of the area around Tintagel Castle in Cornwall, U.K. The model is on display in the new visitor centre at the castle. Vertical images were taken with a fixed wing and oblique images with a multirotor. Data capture faced two major challenges: the weather and steeply rising cliffs. Working in the winter, in windy and gloomy conditions, proved tricky for obtaining sharp and vivid images so the use of high-quality cameras was a must. In contrast, the legal limitations were modest. Numéro de notice : A2016-104 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79931
in GIM international [en ligne] > vol 30 n° 3 (March 2016) . - pp 33 - 35[article]Spatial accuracy of UAV- derived orthoimagery and topography: Comparing photogrammetric models processed with direct geo-referencing and ground control points / Chris H. Hugenholtz in Geomatica, vol 70 n° 1 (March 2016)
[article]
Titre : Spatial accuracy of UAV- derived orthoimagery and topography: Comparing photogrammetric models processed with direct geo-referencing and ground control points Type de document : Article/Communication Auteurs : Chris H. Hugenholtz, Auteur ; Owen Brown, Auteur ; Jordan Walker, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 21 - 30 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] acquisition de données
[Termes IGN] analyse comparative
[Termes IGN] capteur aérien
[Termes IGN] drone
[Termes IGN] géoréférencement direct
[Termes IGN] point d'appui
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] positionnement inertiel
[Termes IGN] positionnement par GNSS
[Termes IGN] positionnement par GPS
[Termes IGN] qualité des données
[Termes IGN] réalité de terrain
[Termes IGN] topographieRésumé : (auteur) Mapping with unmanned aerial vehicles (UAVs) typically involves the deployment of ground control points (GCPs) to georeference the images and topographic model. An alternative approach is direct georeferencing, whereby the onboard Global Navigation Satellite System (GNSS) and inertial measurement unit are used without GCPs to locate and orient the data. This study compares the spatial accuracy of these approaches using two nearly identical UAVs. The onboard GNSS is the one difference between them, as one vehicle uses a survey-grade GNSS/RTK receiver (RTK UAV), while the other uses a lower-grade GPS receiver (non-RTK UAV). Field testing was performed at a gravel pit, with all ground measurements and aerial surveying completed on the same day. Three sets of orthoimages and DSMs were produced for comparing spatial accuracies: two sets were created by direct georeferencing images from the RTK UAV and non-RTK UAV and one set was created by using GCPs during the external orientation of the non-RTK UAV images. Spatial accuracy was determined from the horizontal (X,Y) and vertical (Z) residuals and root-mean-square-errors (RMSE) relative to 17 horizontal and 180 vertical check points measured with a GNSS/RTK base station and rover. For the two direct georeferencing datasets, the horizontal and vertical accuracy improved substantially with the survey-grade GNSS/RTK receiver onboard the RTK UAV, effectively reducing the RMSE values in X, Y and Z by 1 to 2 orders of magnitude compared to the lower grade GPS receiver onboard the non-RTK UAV. Importantly, the horizontal accuracy of the RTK UAV data processed via direct georeferencing was equivalent to the horizontal accuracy of the non-RTK UAV data processed with GCPs, but the vertical error of the DSM from the RTK UAV data was 2 to 3 times greater than the DSM from the non-RTK data with GCPs. Overall, results suggest that direct georeferencing with the RTK UAV can achieve horizontal accuracy comparable to that obtained with a network of GCPs, but for topographic measurements requiring the highest achievable accuracy, researchers and practitioners should use GCPs. Numéro de notice : A2016-433 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : 10.5623/cig2016-102 En ligne : https://doi.org/10.5623/cig2016-102 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81330
in Geomatica > vol 70 n° 1 (March 2016) . - pp 21 - 30[article]UAV monitoring and documentation of a large landslide / Gerald Lindner in Applied geomatics, vol 8 n° 1 (March 2016)
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Titre : UAV monitoring and documentation of a large landslide Type de document : Article/Communication Auteurs : Gerald Lindner, Auteur ; Klaus Schraml, Auteur ; Reinfried Mansberger, Auteur ; Johannes Hübl, Auteur Année de publication : 2016 Article en page(s) : pp 1 - 11 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] Autriche
[Termes IGN] drone
[Termes IGN] effondrement de terrain
[Termes IGN] modèle numérique de surface
[Termes IGN] orthoimage
[Termes IGN] surveillance géologiqueRésumé : (Auteur) In June 2013, heavy precipitation triggered a large earthflow of several million cubic meters in a small village in Austria. A bundle of technologies was applied to monitor and document the landslide, such as geophysical methods (geoelectrics, inclinometer, soil moisture, and soil temperature) and Global Navigation Satellite System (GNSS) measurements. Additionally, an Unmanned Aerial Vehicle (UAV) was used for the periodical assessment of the landslide process. In total, nine flights were performed with a multicopter equipped with a digital single-lens reflex camera (DSLR) that delivered several thousands of images. Based on these images and detailed GNSS measurements of the landslide area, orthophotos as well as generated Digital Surface Models (DSMs) with an accuracy of less than ±10 cm resulted. Fissure tracking, flow direction and velocity, and mass balances as well as the construction progress of the protection and mitigation measures were derived from these data sets. The application of the UAV turned out to be a cost- and time-effective tool for landslide-monitoring that provides researchers and engineers with accurate high-resolution geodata. Numéro de notice : A2016--055 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1007/s12518-015-0165-0 Date de publication en ligne : 09/11/2015 En ligne : http://dx.doi.org/10.1007/s12518-015-0165-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84203
in Applied geomatics > vol 8 n° 1 (March 2016) . - pp 1 - 11[article]Antenna pilots UAV / Adrien Perkins in GPS world, vol 27 n° 2 (February 2016)
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Titre : Antenna pilots UAV Type de document : Article/Communication Auteurs : Adrien Perkins, Auteur ; Louis Dressel, Auteur ; Sherman Lo, Auteur ; Per Enge, Auteur Année de publication : 2016 Article en page(s) : pp 48 - 56 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] brouillage
[Termes IGN] distorsion du signal
[Termes IGN] drone
[Termes IGN] navigation aérienne
[Termes IGN] radiofréquenceRésumé : (éditeur) A jammer hunting UAV employs a radio frequency (RF) detection system and a navigation control scheme. The RF detection component uses a directional antenna and the unmanned aerial vehicle’s (UAV’s) ability to rotate to determine a bearing to the jammer. The navigation control scheme selects a trajectory for making bearing measurements that enable rapid jammer localization, based on three bearing calculation methods: max, cross-correlation, and a modification of max leveraging the shape of the antenna’s main lobe, known as max3. Numéro de notice : A2016-032 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79479
in GPS world > vol 27 n° 2 (February 2016) . - pp 48 - 56[article]Reconstructing a church in 3D / Matthias Naumann in GIM international [en ligne], vol 30 n° 2 (February 2016)
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Titre : Reconstructing a church in 3D Type de document : Article/Communication Auteurs : Matthias Naumann, Auteur ; Gôrres Grenidôrffer, Auteur Année de publication : 2016 Article en page(s) : pp 12 - 15 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] appariement de données localisées
[Termes IGN] données lidar
[Termes IGN] drone
[Termes IGN] église
[Termes IGN] photogrammétrie architecturale
[Termes IGN] photogrammétrie terrestre
[Termes IGN] précision des données
[Termes IGN] reconstruction 3D du bâti
[Termes IGN] semis de pointsRésumé : (éditeur) Reconstruction and maintenance work in historical buildings such as churches requires detailed and accurate information about them, but it can be difficult and expensive to acquire such data efficiently. The combination of terrestrial Lidar and UAS-based photogrammetry provides an adequate approach for gathering a full model of the outside of a church. Additionally, it allows for accuracy evaluation by comparing areas with overlap between terrestrial Lidar and the point cloud derived from the UAS images. Numéro de notice : A2016-081 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79916
in GIM international [en ligne] > vol 30 n° 2 (February 2016) . - pp 12 - 15[article]Telespazio aurait-il trouvé la solution pour développer l'usage du spatial / Françoise de Blomac in DécryptaGéo le mag, n° 174 (février 2016)PermalinkApplication des techniques de photogrammétrie par drone à la caractérisation des ressources forestières / Jonathan Lisein (2016)PermalinkEntwicklung einer direkten Georeferenzierungseinheit zur Positions- und Orientierungbestimmung leichter UAVs in Eichzeit / Christian Eling (2016)PermalinkPermalinkMise en place de procédures automatiques en vue d’accélérer la production des plans topographiques au sein de l’entreprise Techni Drone / Kévin Javerliat (2016)PermalinkStudy of lever-arm effect using embedded photogrammetry and on-board GPS receiver on UAV for metrological mapping purpose and proposal of a free ground measurements calibration procedure / Mehdi Daakir (2016)PermalinkThe art of seeing / Philippe Roy in GEO: Geoconnexion international, vol 15 n° 1 (January 2016)PermalinkThe future of disaster response management / Krista Montgomery in GEO: Geoconnexion international, vol 15 n° 1 (January 2016)PermalinkUtilisation des outils de la télédétection très haute résolution pour le suivi de la végétation sur la zone de compensation écologique Ile Falcon / Clément Boutry (2016)PermalinkApplication of technical measures and software in constructing photorealistic 3D models of historical building using ground-based and aerial (UAV) digital images / Aleksander Zarnowski in Reports on geodesy and geoinformatics, vol 99 (December 2015)Permalink