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A revolution in handheld mobile mapping / Anonyme in GIM international, vol 30 n° 3 (March 2016)
[article]
Titre : A revolution in handheld mobile mapping Type de document : Article/Communication Auteurs : Anonyme, Auteur Année de publication : 2016 Article en page(s) : pp 36 - 37 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] lever mobile
[Termes IGN] positionnement en intérieur
[Termes IGN] système de numérisation mobileRésumé : (éditeur) GeoSLAM is a UK-based company with a global réputation for developing game-changing survey solutions. From its Nottingham headquarters, GeoSLAM has pioneered the development and manufacture of handheld indoor 3D mobile mapping systems such as the award-winning ZEB1 and newly released ZEB-REVO. Utilising revolutionary simultaneous localisation and mapping (SLAM) technology, GeoSLAM's solutions offer a cost-effective alternative for rapid mapping of enclosed environments without the need for GPS. GeoSLAM strives to create solutions which are fast, accurate, proven and efficient, for a diverse range of applications including measured building surveys and real estate valuations, mine and cave mapping, forestry scanning and crime scene reconstruction. Numéro de notice : A2016-105 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79932
in GIM international > vol 30 n° 3 (March 2016) . - pp 36 - 37[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]The use of laser scanning as a method for measuring stairways following an accident / M. Eyre in Survey review, vol 48 n° 347 (March 2016)
[article]
Titre : The use of laser scanning as a method for measuring stairways following an accident Type de document : Article/Communication Auteurs : M. Eyre, Auteur ; P. J. Foster, Auteur ; K. Hallas, Auteur ; R. Shaw, Auteur Année de publication : 2016 Article en page(s) : pp 121 - 129 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Topographie moderne
[Termes IGN] analyse spatiale
[Termes IGN] architecture
[Termes IGN] carte d'intérieur
[Termes IGN] dommage physique
[Termes IGN] inclinomètre (topographie)
[Termes IGN] lever des détails
[Termes IGN] reconstruction 3D
[Termes IGN] surveillance d'ouvrage
[Termes IGN] télémétrie laser terrestreRésumé : (auteur) Stairs present significant potential for harm to their users. A fall on stairs, particularly in descent, often leads to serious injury or even death. The authors have been involved in the investigation of many workplace stair accidents. Proper forensic investigation into the cause of a stair accident has often found the incident to be wholly or partly caused by poor stair design. In order to establish the relationship between the stair design and a given fall, an onsite survey has to be conducted, determining the rises and goings along with other key dimensions. The Health and Safety Laboratory (HSL), Buxton, UK, regularly undertake this type of survey using a digital inclinometer, a steel rule and a tape measure. Laser scanning is an emerging technique that is now accessible to the surveyor to complement or replace traditional approaches. The laser scanner and associated software produces a dense point survey in 3D, allowing dimensional analysis of the features. The authors used both traditional and laser scanning techniques to study the scenes of two fatal stair falls. The analysis presented allows the suitability of laser scanning for stair-fall investigation to be considered. Identification and classification of errors are needed in order to consider if the error is acceptable or can be mitigated. Laser scanners are impressive instruments providing data from which can be used to create a virtual 3D environment that can be used to reconstruct and explain an event and contributing factors. The use of both survey methods currently provides the investigator with complimentary data that allows accurate measurements to be presented in the context of the three-dimensional environment. Numéro de notice : A2016-048 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1179/1752270615Y.0000000014 En ligne : https://doi.org/10.1179/1752270615Y.0000000014 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79642
in Survey review > vol 48 n° 347 (March 2016) . - pp 121 - 129[article]UAV monitoring and documentation of a large landslide / Gerald Lindner in Applied geomatics, vol 8 n° 1 (March 2016)
[article]
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)
[article]
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]DEM-assisted RFM block adjustment of pushbroom nadir viewing HRS imagery / Yongjun Zhang in IEEE Transactions on geoscience and remote sensing, vol 54 n° 2 (February 2016)PermalinkGeomatics for cultural heritage preservation / Efstratios Stylianidis in GIM international, vol 30 n° 2 (February 2016)PermalinkA new high-precision and low-power GNSS receiver for long-term installations in remote areas / David H. Jones in Geoscientific instrumentation methods and data systems, vol 5 n° 1 (January - June 2016)PermalinkNull-steering antennas: Assessing the performance of multi-antenna interference-rejection techniques / James T. Curran in GPS world, vol 27 n° 2 (February 2016)PermalinkOptimising the spatial resolution of WorldView-2 pan-sharpened imagery for predicting levels of Gonipterus scutellatus defoliation in KwaZulu-Natal, South Africa / Romano Lottering in ISPRS Journal of photogrammetry and remote sensing, vol 112 (February 2016)PermalinkReconstructing a church in 3D / Matthias Naumann in GIM international, vol 30 n° 2 (February 2016)PermalinkRotation-and-scale-invariant airplane detection in high-resolution satellite images based on deep-Hough-forests / Yongtao Yu in ISPRS Journal of photogrammetry and remote sensing, vol 112 (February 2016)PermalinkSpace–time adaptive processing and motion parameter estimation in multistatic passive radar using sparse Bayesian learning / Qisong Wu in IEEE Transactions on geoscience and remote sensing, vol 54 n° 2 (February 2016)PermalinkTelespazio aurait-il trouvé la solution pour développer l'usage du spatial / Françoise de Blomac in DécryptaGéo le mag, n° 174 (février 2016)PermalinkThe Costa Concordia last cruise: The first application of high frequency monitoring based on COSMO-SkyMed constellation for wreck removal / Andrea Ciampalini in ISPRS Journal of photogrammetry and remote sensing, vol 112 (February 2016)PermalinkUtilisation d’une source laser pulsée à haute energie comme source acoustique large bande en milieu liquide / Jean-Pierre Sessarego in Traitement du signal, vol 33 n° 1 (2016-1)PermalinkAcquisition et reconstruction de données 3D denses sous-marines en eau peu profonde par des robots d'exploration / Loïca Avanthey (2016)PermalinkPermalinkAirborne DLSLA 3-D SAR image reconstruction by combination of polar formatting and L_1 regularization / Xueming Peng in IEEE Transactions on geoscience and remote sensing, vol 54 n° 1 (January 2016)PermalinkPermalinkUne application SIG pour l’optimisation de la collecte des déchets post-inondation / Serge Lhomme (2016)PermalinkApplication des techniques de photogrammétrie par drone à la caractérisation des ressources forestières / Jonathan Lisein (2016)PermalinkApport de la géodésie française fond de mer à l'évaluation de l'aléa sismique côtier : distancemétrie en mer de Marmara et simulation de GNSS/A aux Antilles / Pierre Sakic-Kieffer (2016)PermalinkAuscultation de l'état de surface de revêtements routiers par photogrammétrie automatisée / Gildas Allaz in Géomatique suisse, vol 114 n° 1 (janvier 2016)PermalinkAutomatic modeling of building interiors using low-cost sensor systems / Ali Mohammad Khosravani (2016)Permalink