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Development and evaluation of GNSS/INS data processing software for position and orientation systems / X. Niu in Survey review, vol 47 n° 341 (March 2015)  

Public [article]  inSurvey review > vol 47 n° 341 (March 2015) . - pp 87 - 98 Titre : Development and evaluation of GNSS/INS data processing software for position and orientation systems Type de document : Article/Communication Auteurs : X. Niu, Auteur ; Qian Zhang, Auteur ; L. Gong, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 87 - 98 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] centrale inertielle à composants liés [Termes IGN] couplage GNSS-INS [Termes IGN] filtre de Kalman [Termes IGN] logiciel de post-traitement GPS [Termes IGN] traitement de données GNSS [Vedettes matières IGN] Traitement de données GNSS Résumé : (auteur) Currently there are limited supportive and reliable commercial software packages for GNSS/INS data processing. The shortage of compatible GNSS/INS data processing software has become a bottleneck in the development of position and orientation systems (POS) for survey and mapping applications. Thus this paper introduces a GNSS/INS data processing software called Cinertial, which has been recently developed in China, with open definitions of data format and parameters. The algorithm design of the software is described in detail, including the realisation of INS mechanisation, Kalman filtering, and backward smoothing. The developed software is tested and evaluated by comparing it with mainstream commercial software through processing the same field test datasets. A precise and feasible comparison procedure is proposed in the paper, so as to evaluate the quality of any new POS software in an efficient, convenient, and cost-effective way. The procedure was applied to compare our new software with two well known commercial software packages through processing airborne and terrestrial datasets respectively. The results show that the new software can achieve the same level of accuracy as the current commercial software on the market, which reflects a new progress of the POS development in China. Numéro de notice : A2015-956 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1179/1752270614Y.0000000099 En ligne : http://www.tandfonline.com/doi/full/10.1179/1752270614Y.0000000099 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79941 [article]

Estimation of multi-constellation GNSS observation stochastic properties using single receiver single satellite data validation method / Ahmed El-Mowafy in Survey review, vol 47 n° 341 (March 2015)  

Public [article]  inSurvey review > vol 47 n° 341 (March 2015) . - pp 99 - 108 Titre : Estimation of multi-constellation GNSS observation stochastic properties using single receiver single satellite data validation method Type de document : Article/Communication Auteurs : Ahmed El-Mowafy, Auteur Année de publication : 2015 Article en page(s) : pp 99 - 108 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] constellation GNSS [Termes IGN] positionnement cinématique [Termes IGN] positionnement par Galileo [Termes IGN] positionnement par GLONASS [Termes IGN] positionnement par GPS [Termes IGN] positionnement statique [Termes IGN] récepteur [Termes IGN] validation des données [Vedettes matières IGN] Traitement de données GNSS Résumé : (auteur) The single receiver single satellite validation method is a technique that screens data from each satellite independently to detect and identify faulty observations. A new method for estimation of the stochastic properties of multi-constellation GNSS observation is presented utilising parameters of this validation method. Agreement of the characteristics of the validation statistics with theory is used as the criterion to select the best precision of the observations, spectral density and correlation time of the unknowns. A curve fitting approach in an iterative scheme is employed. The method is applicable to any GNSS with any arbitrary number of frequencies. Demonstration of the method results and performance is given using multiple-frequency data from GPS, GLONASS and Galileo in static and kinematic modes. Numéro de notice : A2015-957 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1179/1752270614Y.0000000100 En ligne : https://doi.org/10.1179/1752270614Y.0000000100 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79942 [article]

Photogrammetric techniques and surveying applied to historical map analysis / C. San-Antonio-Gómez in Survey review, vol 47 n° 341 (March 2015)  

Public [article]  inSurvey review > vol 47 n° 341 (March 2015) . - pp 115 - 128 Titre : Photogrammetric techniques and surveying applied to historical map analysis Type de document : Article/Communication Auteurs : C. San-Antonio-Gómez, Auteur ; C. Velilla, Auteur ; F. Manzano-Agugliaro, Auteur Année de publication : 2015 Article en page(s) : pp 115 - 128 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] carte ancienne [Termes IGN] erreur de positionnement [Termes IGN] numérisation de carte [Termes IGN] photogrammétrie numérique [Termes IGN] point d'appui [Termes IGN] redressement numérique Résumé : (auteur) Since historical maps are kept in digital format archives, they have not only the planimetric errors attributable to the cartographer but also those transferred during digitalising. This paper describes a methodology based on photogrammetric techniques and surveying applied to evaluate the accuracy of historical maps. The aim of the study is to take reference points on tracing paper from the original map and ground control points in order to use photogrammetric techniques to recover the metrics of the digitalised map. This ensures that the historical map in digital form has the same metric quality as the original map, since the errors arising from scanning are removed. This method is applied to 1775 map of the Real Sitio de Aranjuez (Spain), demonstrating that the application of photogrammetric techniques are useful tools for correction and analysis of historical maps. Consequently, photogrammetric techniques applied to the analysis of historical maps open up new perspectives for the study of the historical Cartography. Numéro de notice : A2015-958 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1179/1752270614Y.0000000098 En ligne : https://doi.org/10.1179/1752270614Y.0000000098 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79943 [article]

Target identification in terrestrial laser scanning / Xuming Ge in Survey review, vol 47 n° 341 (March 2015)  

Public [article]  inSurvey review > vol 47 n° 341 (March 2015) . - pp 129 - 140 Titre : Target identification in terrestrial laser scanning Type de document : Article/Communication Auteurs : Xuming Ge, Auteur ; T. Wunderlich, Auteur Année de publication : 2015 Article en page(s) : pp 129 - 140 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] chaîne de traitement [Termes IGN] détection de cible [Termes IGN] télémètre laser à balayage [Termes IGN] télémétrie laser terrestre Résumé : (auteur) Target identification is an important process in terrestrial laser scanner (TLS) measurements; however, due to strong competition between manufacturers, the design of laser scanners is kept secret and is usually strengthened by accompanying proprietary software. Moreover, the target identification algorithms (i.e. definitions of the target centre) are not specified. This makes it difficult for users to objectively compare scanners from different manufacturers and to judge the reliability of the captured scan data by a brand scanner and accompanying software. This paper presents a unified general method to complete the process of target identification. The proposed method consists of four major steps: first, determination of the target plane; second, classification of the reflection intensity values and extraction of the border between white and black; third, detection and elimination of erroneous points from step two; and fourth, fitting of the intersection lines and calculation of the centre of the two lines. Because TLS is a reflectorless surveying model that can receive hundreds of signals, its measurements require more stringent objective conditions than traditional measurement by total stations (TS). Therefore, robust estimation methods are used to reduce the influence of random errors; moreover, the model of error-in-value (EIV) is also introduced to deal with captured data. Finally, the target’s centre can be obtained from an iteration process. For the experiments, a Leica HDS 7000 terrestrial laser scanner, with its accompanying software, Cyclone, and a Leica Laser Tracker AT901 were employed. The performance of the proposed method is compared with Cyclone and some early methods from published studies at different resolutions and distances. The paper concludes that the proposed method can obtain reliable results at the same level of accuracy level as those obtained using accompanying software; thus, it provides an objective means to compare the quality of different scanners. The advantage is that our method only makes use of information provided by all scanners and does not require additional proprietary information that cannot be accessed. Numéro de notice : A2015-959 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1179/1752270614Y.0000000097 En ligne : https://doi.org/10.1179/1752270614Y.0000000097 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79946 [article]