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UAV flight over Singapore: a pilot study / Armin W. Gruen in Geoinformatics, vol 15 n° 3 (01/04/2012)
[article]
Titre : UAV flight over Singapore: a pilot study Type de document : Article/Communication Auteurs : Armin W. Gruen, Auteur Année de publication : 2012 Article en page(s) : pp 34 - 36 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] acquisition d'images
[Termes IGN] chambre CMOS
[Termes IGN] drone
[Termes IGN] modèle 3D de l'espace urbain
[Termes IGN] SingapourRésumé : (Editeur) For the first time Singaporean authorities have given permission for a photogrammetric UAV mapping/modeling flight over an important area of the city. In the context of the SEC-FCL (Future Cities Laboratory) project a pilot study is conducted with the goal to generate a high quality 3D city model of the NUS campus from UAV images. 800 images were needed to cover the area. Data processing is in progress. Numéro de notice : A2012-166 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31613
in Geoinformatics > vol 15 n° 3 (01/04/2012) . - pp 34 - 36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 262-2012031 SL Revue Centre de documentation Revues en salle Disponible Review of developments in geometric modelling for high resolution satellite pushbroom sensors / Daniela Poli in Photogrammetric record, vol 27 n° 137 (March - May 2012)
[article]
Titre : Review of developments in geometric modelling for high resolution satellite pushbroom sensors Type de document : Article/Communication Auteurs : Daniela Poli, Auteur ; Thierry Toutin , Auteur Année de publication : 2012 Article en page(s) : pp 58 - 73 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] capteur en peigne
[Termes IGN] capteur optique
[Termes IGN] capteur spatial
[Termes IGN] modélisation géométrique de prise de vueRésumé : (Auteur) The geometric modelling of satellite imaging sensors is a fundamental step in the photogrammetric processing chain, and becomes crucial in multi-source data fusion and analysis. This paper seeks to report the main characteristics and developments of optical pushbroom sensors for photogrammetric and remote sensing applications, and to provide a critical review of approaches used for their geometric modelling. Numéro de notice : A2012-130 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2011.00665.x Date de publication en ligne : 09/02/2012 En ligne : https://doi.org/10.1111/j.1477-9730.2011.00665.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31578
in Photogrammetric record > vol 27 n° 137 (March - May 2012) . - pp 58 - 73[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 106-2012011 RAB Revue Centre de documentation En réserve L003 Disponible Ableitung von Bewegungsstrategien zur automatisierten, vollständigen Vermessung von Innerraumszenen auf autonom navigierender Plattform / Alexander Fietz (2012)
Titre : Ableitung von Bewegungsstrategien zur automatisierten, vollständigen Vermessung von Innerraumszenen auf autonom navigierender Plattform Titre original : [Détournement (ou dérivation) de stratégies de mouvement pour la mesure complète et automatisée de scènes spatiales intérieures sur la plate-forme de navigation autonome] Type de document : Thèse/HDR Auteurs : Alexander Fietz, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2012 Collection : DGK - C Sous-collection : Dissertationen num. 685 Importance : 164 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5097-6 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] bloc photo
[Termes IGN] caméra numérique
[Termes IGN] compensation par faisceaux
[Termes IGN] données lidar
[Termes IGN] données localisées 2D
[Termes IGN] données localisées 3D
[Termes IGN] lasergrammétrie
[Termes IGN] photogrammétrie terrestre
[Termes IGN] plateforme
[Termes IGN] positionnement en intérieur
[Termes IGN] reconstruction 3D
[Termes IGN] robot
[Termes IGN] segment de droite
[Termes IGN] semis de points
[Termes IGN] système de numérisation mobile
[Termes IGN] tachéomètre électronique
[Termes IGN] varianceRésumé : (Auteur) A fundamental task of an autonomous mobile robot is the ability of self-localization in its environment respectively in a map of it, available to the robot. Many applications require a localization that is as precise as possible. Thereby, a decisive factor is the accuracy but also the completeness of the map. The generated map can usually be seen as a necessary side-product. When considered from a surveying point of view, it is brought more into focus. The question is to what extent the spatial robot data can fulfill certain mapping requirements in terms of accuracy and completeness in a detailed enough manner to be useful to human users. Precise models of indoor environments are very useful in both public and private sectors. But since their procurement involves a great deal of effort, an automatical generation of indoor models is desirable.
The following thesis should make a contribution to this and tries to compose the techniques that are necessary to deliver interior models at the push of a button. Therefore, a mobile measuring system was designed, that is able to carry out complete and precise measurements of indoor environments. The system was build up in two stages. A mobile platform is equipped with a low-cost laser scanner in the basic stage. This build-up allows a precise exploration of indoor scenes in 2D. In an expansion stage the installation of a digital camera leads to an additional 3D reconstruction based on photogrammetric techniques.
The accuracy and quality of robotic mapping is primarily dependent on the sensors that are used. The software process to register the collected data in a common coordinate frame and to create a holistic map of the environment has an additional influence. In the field of scanning systems scan matching techniques or probabilistic filter approaches are used. In the case of 3D surveying, a photogrammetric reconstruction can be done by an estimation of feature points, which are extracted from a photo block, within a bundle adjustment process. Results can be optimized, if requirements and restrictions of these techniques are regarded in the data acquisition process, when the robot proceeds the exploration. A crucial aspect is the spatial sensor placement at a certain point of time in this process. In the field of robotics, sensor placement is controlled by positioning strategies, which normally are of overriding importance to all other processes. The majority of known positioning strategies have the primary aim to optimize the efficiency of the exploration, so that every measurement provides as much new spatial information as possible. Requirements of the data registration technique are neglected in contrast. This thesis presents positioning strategies for scanning 2D measurements as well as photogrammetric 3D measurements, which try to maximize the accuracy of the collected spatial data. A scanning 2D measuring system, which is able to explore previously unknown indoor environments and generate precise floor plans is presented in the first part of this thesis. The system iteratively visits measurement poses defined by a positioning strategy. 2D point clouds, collected at various positions, are transformed into a common coordinate system by the use of a scan matching technique. The latter takes advantage of the characteristic manifestation of office environments and extracts planar segments from the measured point clouds. Minimizing the sum of perpendicular distances to these segments, points of a new scan are transformed into the existing coordinate system with high accuracy. Precision and robustness are improved through iterative parameter refinement. The measuring system uses a positioning strategy, which is based on the global assumption that the environment can be described as a collection of line segments. Since segment ends indicate data gaps, exploration is pushed until their observation is complete. All accessible measuring positions, represented in an occupancy grid, are evaluated in terms of their explorative benefit by the strategy using a cost function. Exploration is stopped as soon as every section is observed with a desired resolution.
The second part of this work presents a positioning strategy to enable the recording of photo blocks that are suitable for a photogrammetric reconstruction. In the run-up of data acquisition possible pose configurations are determined using accuracy estimation. The assumption of plain environments allows a limitation to a 2D search problem regarding the choice of possible camera poses, whereby the combinatorial variety is reduced. Initial information of pose estimation provides a 2D map, generated by the system structure that was presented in the first part of this work. For predefined sections of the environment, pseudo-random pose constellations are derived iteratively from the map and compared with each other using a cost function. The cost function helps to predict the variances resulting from a bundle adjustment. Therefore the functional model of the bundle adjustment has to be projected on the R2 in a way that a geodetic network consisting of direction measurements remains. The size and the shape of the resulting error ellipses allow conclusions and a comparative consideration regarding the quality of camera pose candidates.
An essential part of the work is the empirical analysis of the systems, to evaluate their performance and the quality of the resulting spatial data. Various experiments in real indoor environments show that developed measurement methods can be applied in practice. In different sets of experiments initial conditions are varied to find out their influence on the measurement process or the result. In order to achieve reliable results, reference models of the experimental environments were created by the use of a total station.
In the case of scanner measurements, experiments show that the developed system is able to explore and measure also complex interiors. An examination of the point clouds show that the achieved accuracy comes up with surveying demands. On this issue, the presented technique outplays conventional measuring equipment. However, additional modeling shows that mainly fine structures of the environment are displayed wrongly or are even lost completely. Also the 3D measuring strategy is demonstrably superior to existing techniques. The purely passive technique leads to sparse point clouds, not dense enough to derive detailed environment models with the corresponding software.Numéro de notice : 14621 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère DOI : sans En ligne : https://www.ifp.uni-stuttgart.de/dokumente/Dissertationen/diss-fietz-c-685.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62672
Titre : Analyse des modèles de remplacement (RSM) Type de document : Mémoire Auteurs : Maxime Scannavino, Auteur Editeur : Champs-sur-Marne : Ecole nationale des sciences géographiques ENSG Année de publication : 2012 Importance : 124 p. Format : 21 x 30 cm Note générale : Bibliographie
Rapport de projet de fin d'études, [3ème année du cycle des ingénieurs ENSG], mastère spécialisé Photogrammétrie, Positionnement et Mesure de DéformationLangues : Français (fre) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] analyse comparative
[Termes IGN] capteur en peigne
[Termes IGN] distorsion d'image
[Termes IGN] erreur systématique
[Termes IGN] Matlab
[Termes IGN] matrice de covariance
[Termes IGN] modèle géométrique de prise de vue
[Termes IGN] modèle par fonctions rationnellesIndex. décimale : MPPMD Mémoires du mastère spécialisé Photogrammétrie, Positionnement et Mesures de Déformation Résumé : (Auteur) Le géo-référencement des images peut être assuré par un modèle de remplacement qui se substitue au modèle plus complexe mais représentatif de la physique du capteur, aussi appelé modèle physique. L'objectif de cette étude est d'analyser les conditions de génération de ces modèles de remplacement, connaissant le modèle physique du capteur, et de tester leurs précisions relatives dans plusieurs configurations. Nous nous intéresserons particulièrement aux modèles polynomiaux incluant les polynômes simples et les RPCs. Les résultats obtenus montrent l'importance de la structure des données d'apprentissage et de l'étape de normalisation dans la précision du modèle. La modélisation par RPCs s'adapte plus au capteur de type frame qu'au capteur de type pushbroom mais reste valide dans les deux cas. Nous préconisons ainsi le modèle RPCs comme modèle de remplacement car il est plus robuste et plus précis que le modèle polynomial simple. Il s'applique à toutes les configurations des capteurs mais trouve une limite temporelle dans le cas d'un capteur de type pushbroom et son estimation nécessite certaines contraintes sur les données d'apprentissage comme par exemple, posséder au moins quatre couches d'altitude. Enfin, le modèle RPCs peut être amélioré en le composant avec une fonction affine estimée sur quelques points d'appui. Note de contenu : Introduction
1. Rappels et définitions
1.1. Le modèle direct et le modèle inverse
1.1.1. Le modèle direct
1.1.2. Le modèle inverse
1.2. Les modèles frame ("matriciel") et pushbroom ("capteur à barrettes")
1.2.1. Le modèle frame ("matriciel")
1.2.2. Modèle pushbroom ("capteur à barrettes")
1.3. Les repères utiles
1.3.1. Les repères liés à l'image
1.3.2. Les autres repères
1.4. Méthode d'intersection du rayon lumineux et du sol
1.5. Bilan
2. Le contexte général
2.1. Le modèle physique
2.1.1. La fonction de localisation d'un capteur frame
2.1.2. La fonction de localisation d'un capteur pushbroom
2.2. Les corrections
2.3. Les modèles de remplacement (RSM)
2.3.1. Les modèles grilles
2.3.2. Les modèles polynomiaux simple e RPCs
3. La conception des modèles de remplacement
3.1. La génération des données
3.1.1. Echantillonnage à partir de l'image
3.1.2. Echantillonnage à partir du terrain
3.2. La normalisation et la dé normalisation:
3.3. L'estimation des coefficients des polynômes
3.3.1. L'équation normale
3.3.2. Résolution de l'équation normale
3.4. Les données de précision du modèle
3.4.1. Les erreurs de biais
3.4.2. La matrice de covariance
4. Les résultats des tests
4.1. Le contexte de réalisation des tests
4.1.1. Le matériel et les objectifs
4.1.2. La validation de la modélisation sous Matlab
4.1.3. Présentation des résultats
4.2. Comparaisons entre RPCs et polynômes simples
4.2.1. Différences de mise en oeuvre
4.2.2. Différences de précision
4.3. Influence des données d'apprentissage
4.3.1. Nombre d'observations minimal
4.3.2. Nombre de couches d'altitudes utiles et effet du pas en Z
4.3.3. Effet de l'échantillonnage à partir du terrain ou de l'image
4.3.4. Effet sur des données situées en dehors de la zone d'apprentissage
4.4. Sensibilité à l'oblicité du capteur et effet temporel du pushbroom
4.4.1. Sensibilité à l'oblicité du capteur
4.4.2. Effet temporel du pushbroom
4.5. Effet de la normalisation
4.6. Tests des RPC00B, RSMPCA et RSMPIA
4.6.1. Influence du degré des polynômes
4.6.2. Enregistrement des coefficients des RPC00B et RSMPCA
4.7. Conclusion des tests
5. Améliorations des RPCs
5.1. Composition avec une fonction dans l'espace image
5.1.1. Fonction affine
5.1.2. Fonction polynomiale de degré >1
5.2. Affinage de la position du capteur et génération d'un nouvel PRCs
5.2.1. Calcul d'orientation et de pseudo positions
5.2.2. Utilisation des équations d'observations
ConclusionNuméro de notice : 20749 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Mémoire masters divers Organisme de stage : Thalès Communications & Security Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=51156 Réservation
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20749_mem_pp_2013_analyse_des_modeles_de_remplacement_scannavino.pdfAdobe Acrobat PDF Geometrische und stochastische Modelle zur Verarbeitung von 3D-Kameradaten am Beispiel menschlicher Bewegungsanalysen / Patrick Westfeld (2012)
Titre : Geometrische und stochastische Modelle zur Verarbeitung von 3D-Kameradaten am Beispiel menschlicher Bewegungsanalysen Titre original : [Modèles aléatoires et géométriques pour le traitement de données de caméra 3D en utilisant l'exemple de l'analyse de mouvements humains] Type de document : Thèse/HDR Auteurs : Patrick Westfeld, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2012 Collection : DGK - C Sous-collection : Dissertationen num. 687 Importance : 283 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5099-0 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] caméra 3D
[Termes IGN] compensation par faisceauxRésumé : (Auteur) The three-dimensional documentation of the form and location of any type of object using flexible photogrammetric methods and procedures plays a key role in a wide range of technical-industrial and scientific areas of application. Potential applications include measurement tasks in the automotive, machine building and ship building sectors, the compilation of complex 3D models in the fields of architecture, archaeology and monumental preservation and motion analyses in the fields of flow measurement technology, ballistics and medicine. In the case of close-range photogrammetry a variety of optical 3D measurement systems are used. Area sensor cameras arranged in single or multi-image configurations are used besides active triangulation procedures for surface measurement (e.g. using structured light or laser scanner systems).
The use of modulation techniques enables 3D cameras based on photomix detectors or similar principles to simultaneously produce both a grey value image and a range image. Functioning as single image sensors, they deliver spatially resolved surface data at video rate without the need for stereoscopic image matching. In the case of 3D motion analyses in particular, this leads to considerable reductions in complexity and computing time. 3D cameras combine the practicality of a digital camera with the 3D data acquisition potential of conventional surface measurement systems. Despite the relatively low spatial resolution currently achievable", as a mono-sensory real-time depth image acquisition system they represent an interesting alternative in the field of 3D motion analysis.
The use of 3D cameras as measuring instruments requires the modelling of deviations from the ideal projection model, and indeed the processing of the 3D camera data generated requires the targeted adaptation, development and further development of procedures in the fields of computer graphics and photogrammetry. This Ph. D. thesis therefore focuses on the development of methods of sensor calibration and 3D motion analysis in the context of investigations into inter-human motion behaviour. As a result of its intrinsic design and measurement principle, a 3D camera simultaneously provides amplitude and range data reconstructed from a measurement signal. The simultaneous integration of all data obtained using a 3D camera into an integrated approach is a logical consequence and represents the focus of current procedural development. On the one hand, the complementary characteristics of the observations made support each other due to the creation of a functional context for the measurement channels, with is to be expected to lead to increases in accuracy and reliability. On the other, the expansion of the stochastic model to include variance component estimation ensures that the heterogeneous information pool is fully exploited.
The integrated bundle adjustment developed facilitates the definition of precise 3D camera geometry and the estimation of range-measurement-specific correction parameters required for the modelling of the linear, cyclical and latency defectives of a distance measurement made using a 3D camera.
The integrated calibration routine jointly adjusts appropriate dimensions across both information channels, and also automatically estimates optimum observation weights. The method is based on the same flexible principle used in self-calibration, does not require spatial object data and therefore foregoes the time-consuming determination of reference distances with superior accuracy. The accuracy analyses carried out confirm the correctness of the proposed functional contexts, but nevertheless exhibit weaknesses in the form of non-parameterized range-measurement-specific errors. This notwithstanding, the future expansion of the mathematical model developed is guaranteed due to its adaptivity and modular implementation. The accuracy of a new 3D point coordinate can be set at 5 mm further to calibration. In the case of depth imaging technology - which is influenced by a range of usually simultaneously occurring noise sources - this level of accuracy is very promising, especially in terms of the development of evaluation algorithms based on corrected 3D camera data.
2.5D Least Squares Tracking (LST) is an integrated spatial and temporal matching method developed within the framework of this Ph. D. thesis for the purpose of evaluating 3D camera image sequences. The algorithm is based on the least squares image matching method already established in photogrammetry, and maps small surface segments of consecutive 3D camera data sets on top of one another. The mapping rule has been adapted to the data structure of a 3D camera on the basis of a 2D affine transformation. The closed parameterization combines both grey values and range values in an integrated model. In addition to the affine parameters used to include translation and rotation effects, the scale and inclination parameters model perspective-related deviations caused by distance changes in the line of sight. A pre-processing phase sees the calibration routine developed used to correct optical and distance-related measurement specific errors in input data and measured slope distances reduced to horizontal distances. 2.5D LSI i
an integrated approach, and therefore delivers fully three-dimensional displacement vectors. In addition, the accuracy and reliability data generated by error calculation can be used as decision criteria for integration into an application-specific processing chain. Process validation showed that the integration of complementary data leads to a more accurate, reliable solution to the correspondence problem, especially in the case of difficult contrast ratios within a channel. The accuracy of scale and inclination parameters directly linked to distance correction terms improved dramatically. In addition, the expansion of the geometric model led to significant benefits, and in particular for the matching of natural, not entirely planar surface segments.
The area-based object matching and object tracking method developed functions on the basis of 3D camera data gathered without object contact. It is therefore particularly suited to 3D motion analysis tasks in which the extra effort involved in multi-ocular experimental settings and the necessity of object signalling using target marks are to be avoided. The potential of the 3D camera matching approach has been demonstrated in two application scenarios in the field of research into human behaviour. As in the case of the use of 2.5 D LST to mark and then classify hand gestures accompanying verbal communication, the implementation of 2.5D LST in the proposed procedures for the determination of interpersonal distance and body orientation within the framework of pedagogical research into conflict regulation between pairs of child-age friends facilitates the automatic, effective, objective and high-resolution (from both a temporal and spatial perspective) acquisition and evaluation of data with relevance to behaviour.
This Ph. D. thesis proposes the use of a novel 3D range imaging camera to gather data on human behaviour, and presents both a calibration tool developed for data processing purposes and a method for the contact-free determination of dense 3D motion vector fields. It therefore makes a contribution to current efforts in the field of the automated videographic documentation of bodily motion within the framework of dyadic interaction, and shows that photogrammetric methods can also deliver valuable results within the framework of motion evaluation tasks in the as-yet relatively untapped field of behavioural research.Numéro de notice : 14622 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère DOI : sans En ligne : https://nbn-resolving.org/urn:nbn:de:bsz:14-qucosa-88592 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62673 Flying the Ultracam XP [in Great Britain] / Mark Tabor in GEO: Geoconnexion international, vol 10 n° 9 (october 2011)PermalinkSimultaneous data capture / H. Grierson in Geoinformatics, vol 14 n° 7 (01/10/2011)PermalinkCalibration of long focal length cameras in close range photogrammetry / Christos Stamatopoulos in Photogrammetric record, vol 26 n° 135 (September - November 2011)PermalinkDevelopment of a new laser triangulation system based on an optical frame of reference / A. Abzal in Photogrammetric record, vol 26 n° 135 (September - November 2011)PermalinkA model-driven approach to estimate atmospheric visibility with ordinary cameras / Raouf Babari in Atmospheric Environment, vol 45 n° 30 (September 2011)PermalinkStatistical analysis of signal measurement in time-of-flight cameras / F. Mufti in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 5 (September - October 2011)PermalinkGlobal ortho project / Matteo Luccio in GIM international, vol 25 n° 7 (July 2011)PermalinkCalibrating and validating multispectral 3D imaging systems at a permanent test site: case study with an Intergraph DMC / Eija Honkavaara in Photogrammetric record, vol 26 n° 134 (June - August 2011)PermalinkComparison of DMC, UltraCam, and ADS40 imagery for benthic habitat and propeller scar mapping / K. Green in Photogrammetric Engineering & Remote Sensing, PERS, vol 77 n° 6 (June 2011)PermalinkLa fabuleuse histoire de la Tête de Maori de Rouen et sa numérisation / S. Varea in XYZ, n° 127 (juin - août 2011)PermalinkThe EuroSDR project "radiometric aspects of digital photogrammetric images" : results of the empirical phase / Eija Honkavaara (01/06/2011)PermalinkCalibration de caméra par acquisition de type panoramique / Bertrand Cannelle in Revue Française de Photogrammétrie et de Télédétection, n° 194 (Mai 2011)PermalinkPermalinkJournées de la recherche [IGN] / Anonyme in Géomatique expert, n° 79 (01/03/2011)PermalinkAerial surveying at airports: STI's two recent projects / Matteo Luccio in Geoinformatics, vol 14 n° 1 (01/01/2011)PermalinkÉléments de technologie pour comprendre la photographie / Michel De Ferrières (2011)PermalinkLa carte forestière sans papier / Thierry Touzet in Le monde des cartes, n° 206 (décembre 2010)PermalinkPermalinkThe IGN CAMv2 system / Jean-Philippe Souchon in Photogrammetric record, vol 25 n° 132 (December 2010 - February 2011)PermalinkA low-cost multi-sensoral mobile mapping system and its feasibility for tree measurements / Anttoni Jaakkola in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 6 (November - December 2010)Permalink