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In-flight quality assessment and data processing for airborne laser scanning / Philipp Schaer (2010)  

Public Titre : In-flight quality assessment and data processing for airborne laser scanning Type de document : Thèse/HDR Auteurs : Philipp Schaer, Auteur ; Jan Skaloud, Directeur de thèse Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 2010 Collection : Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 79 Importance : 166 p. Format : 20 x 30 cm ISBN/ISSN/EAN : 978-3-908440-23-9 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes descripteurs IGN] données lidar [Termes descripteurs IGN] estimation statistique [Termes descripteurs IGN] étalonnage d'instrument [Termes descripteurs IGN] étalonnage en vol [Termes descripteurs IGN] géoréférencement direct [Termes descripteurs IGN] implémentation (informatique) [Termes descripteurs IGN] précision géométrique (imagerie) [Termes descripteurs IGN] qualité des données [Termes descripteurs IGN] semis de points [Termes descripteurs IGN] télémétrie laser aéroporté Résumé : (Auteur) [introduction] [...] The objectives of this research are threefold: 1. Elaborate the theoretical concepts and methodologies needed for performing fast and automated QA/QC of ALS data. This embraces the definition of a methodology to automatically assess the quality of laser measurements and to evaluate the point-cloud coverage and homogeneity. A further objective is to establish a concept to assess the accuracy of derived surface models. 2. Implement the theoretical concepts in a fully functional in-flight QA/QC tool embedded in an ALS system. This requires merging data streams from different technologies (i.e. inertial navigation, GNSS positioning, laser measurements) in real-time (RT), developing its qualitative evaluation and presenting it to the system operator. 3. Provide a thorough analysis of the system performance using data acquired under real operating conditions. The objective is to demonstrate the usefulness of the provided QC information in-flight and to determine the achievable accuracies for ALS data processed in-flight. A particular attention is payed to the evaluations of benefits using real-time Kinematics (RTK) for improving the accuracy of the RT navigation, point-cloud generation and derivation of quality metrics. [...] Note de contenu : 1 Introduction 1.1 Context 1.2 Research Objectives 1.3 Methodology 1.4 External Contributions 1.5 Thesis Outline 2 ALS Enabling Technologies 2.1 Airborne Laser Scanning 2.1.1 History of ALS Technology 2.1.2 Current in-flight QA/QC Capabilities 2.1.3 Trends in ALS 2.2 Direct Georeferencing: Basic Relations 2.3 Laser Scanner Technology 2.4 Positioning Technology 2.5 Integrated Navigation Technology 3 ALS System Calibration and Point-cloud Processing 3.1 System Calibration 3.2 Strip Adjustment 3.3 ALS Point-cloud Data Processing 3.4 Digital Elevation Models 4 Point-cloud Quality Assessment 4.1 Overview of ALS Error Sources 4.2 ALS Navigation Errors 4.3 ALS System Errors 4.4 Assessment of ALS Target Accuracy 4.5 Assessment of Scanning Geometry 4.6 Single Point Quality Indicator 4.7 Error Budget Evaluation 4.8 Use of Quality Indicators in Point-cloud Processing 5 Surface Quality Assessment 5.1 Data Coverage Analysis 5.2 Internal Data Accuracy 5.3 Height Model Data Accuracy . 6 Implementation 6.1 Handheld Airborne Mapping System 6.2 Flight Preparation 6.3 In-flight Quality Assessment Tool (IQUAL) 6.4 GPS Quality Analysis Module (GPSQUAL) 6.5 RT GPS/INS Integration Engine (GIINAV) 6.6 RT ALS Georeferencing Engine (LIEOS) 6.7 LiDAR Quality Analysis Module (LIAN) 6.8 Flight Management and Monitoring Module (HELIPOS) 7 Results and Performance Analysis 7.1 RT Trajectory and Point-cloud Accuracy 7.2 Trajectory Quality Analyses (GPSQUAL) 7.3 ALS Point-cloud Quality Analysis (LIAN) 7.4 Computational Performance 8 Conclusion and Perspectives 8.1 Summary of Contributions 8.2 Conclusions 8.3 Perspectives Bibliography A Derivation of Sub-matrices B Computation of 3D Laser Footprint C Comparison RT - PP Numéro de notice : 10368 Affiliation des auteurs : non IGN Autre URL associée : URL EPFL Thématique : IMAGERIE Nature : Thèse étrangère Note de thèse : PhD thesis : : EPFL : 2010 DOI : 10.5075/epfl-thesis-4590 En ligne : https://www.sgc.ethz.ch/sgc-volumes/sgk-79.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62407

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Testing aerial digital cameras / R. Kathofer in GIM international, vol 24 n° 1 (January 2010)

Public [article]  inGIM international > vol 24 n° 1 (January 2010) . - pp 23 - 25 Titre : Testing aerial digital cameras Type de document : Article/Communication Auteurs : R. Kathofer, Auteur Année de publication : 2010 Article en page(s) : pp 23 - 25 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes descripteurs IGN] chambre de prise de vue numérique [Termes descripteurs IGN] image aérienne [Termes descripteurs IGN] pas d'échantillonnage au sol [Termes descripteurs IGN] photographie numérique [Termes descripteurs IGN] précision géométrique (imagerie) [Termes descripteurs IGN] prise de vue aérienne [Termes descripteurs IGN] UltraCam Résumé : (Auteur) Aerial imaging for mapping purpose is increasingly done using digital cameras. The introducing of new models brings a steady rise in pixel volume, enabling swath width and thus reduction flight line, flight costs and project risks, or data acquisition with larger ground-sample distances (GSD), preserving efficiency. Full exploitation of larger GSD depends on geometrical accuracy, dynamic range, image sharpness and storage device. The author tested these four features of two Ultracam systems : the Xp and L. Copyright Reed Business Numéro de notice : A2009-503 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30132 [article]

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Comparative geometric and radiometric evaluation of mobile phone and still video cameras / Devrim Akca in Photogrammetric record, vol 24 n° 127 (September - November 2009)

Public [article]  inPhotogrammetric record > vol 24 n° 127 (September - November 2009) . - pp 217 - 245 Titre : Comparative geometric and radiometric evaluation of mobile phone and still video cameras Type de document : Article/Communication Auteurs : Devrim Akca, Auteur ; Armin W. Gruen, Auteur Année de publication : 2009 Article en page(s) : pp 217 - 245 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes descripteurs IGN] analyse comparative [Termes descripteurs IGN] autoétalonnage [Termes descripteurs IGN] bruit (théorie du signal) [Termes descripteurs IGN] caméra vidéo [Termes descripteurs IGN] fonction de transfert de modulation [Termes descripteurs IGN] précision géométrique (imagerie) [Termes descripteurs IGN] précision radiométrique [Termes descripteurs IGN] téléphonie mobile Résumé : (Auteur) This paper examines the potential of mobile phones to be used as front-end sensors for photogrammetric procedures and applications. For this purpose, two mobile phone cameras (Sony Ericsson K750i and Nokia N93) were calibrated over an indoor 3D testfield, using a self-calibrating bundle adjustment. Geometric accuracy tests were carried out in order to evaluate their metric performances and to compare the results with respect to two off-the-shelf digital still video cameras (Sony DSC W100 and Sony DSC F828). The geometric accuracy evaluation comprised an absolute accuracy test, JPEG test and temporal stability test. The radiometric capabilities of all cameras (except that the DSC W100 was replaced with a DSC T100 camera) were also evaluated and compared by carrying out modulation transfer function (MTF) analysis, image noise analysis and an operating range test. Substantial systematic errors were diagnosed in some systems. However, with proper calibration it is believed that these devices can be used for many photogrammetric tasks. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2009-327 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29957 [article]

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Testing measurement accuracy in oblique photography using Pixo View technology / J. Sukup in Geoinformatics, vol 12 n° 5 (01/07/2009)

Public [article]  inGeoinformatics > vol 12 n° 5 (01/07/2009) . - pp 36 - 40 Titre : Testing measurement accuracy in oblique photography using Pixo View technology Type de document : Article/Communication Auteurs : J. Sukup, Auteur ; Philip Meixner, Auteur ; K. Sukup, Auteur Année de publication : 2009 Article en page(s) : pp 36 - 40 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes descripteurs IGN] photographie aérienne oblique [Termes descripteurs IGN] photographie numérique [Termes descripteurs IGN] précision géométrique (imagerie) Résumé : (Auteur) With an increase in applications relating to the use of oblique photography, there is now a demand to determine what degree of accuracy can be achieved with oblique photography single-picture measurements in the PixoView application. Copyright GEOinformatics Numéro de notice : A2009-281 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29911 [article]

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Quality assessment for GPS-supported bundle block adjustment based on aerial digital frame imagery / X. Yuan in Photogrammetric record, vol 24 n° 126 (June - August 2009)

Public [article]  inPhotogrammetric record > vol 24 n° 126 (June - August 2009) . - pp 139 - 156 Titre : Quality assessment for GPS-supported bundle block adjustment based on aerial digital frame imagery Type de document : Article/Communication Auteurs : X. Yuan, Auteur Année de publication : 2009 Article en page(s) : pp 139 - 156 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes descripteurs IGN] aérotriangulation numérique [Termes descripteurs IGN] bloc d'images [Termes descripteurs IGN] compensation par bloc [Termes descripteurs IGN] compensation par faisceaux [Termes descripteurs IGN] coordonnées géographiques [Termes descripteurs IGN] pas d'échantillonnage au sol [Termes descripteurs IGN] point d'appui [Termes descripteurs IGN] positionnement par GPS [Termes descripteurs IGN] qualité géométrique (image) Résumé : (Auteur) Accuracy and reliability are two popular indicators for assessment of the quality of aerial triangulation. This paper explores these quality indicators in relation to GPS-supported bundle block adjustment based on aerial digital frame imagery with GPS navigation data. A set of aerial digital frame imagery, taken over hilly terrain using an SWDC-4 area-array digital camera made in China, was selected and used. These empirical images have superior resolution with a pixel size of 9 um, with a ground sample distance of 10 cm and larger than traditional overlaps (80% longitudinal and 63% lateral). GPS-supported bundle block adjustment was carried out with the WuCAPS high-precision combined bundle block adjustment software package developed by the author. The achieved a posteriori standard deviation (rms errors of observation residuals) of the image coordinates is +3·7 um. The empirical accuracy of the photogrammetric point coordinates reaches +7·1 cm for planimetry and +4·8 cm for elevation on the ground, and the average redundancies (average components of the redundancy for one kind of observation) of the image coordinates and the camera station coordinates determined via GPS are more than 0·74 and 0·69, respectively. These results have shown that GPS-supported aerial triangulation with aerial digital frame imagery provides higher precision and reliability; the practical height accuracy is close to its theoretical possibility; also, it avoids the use of the cross strips and lines of ground height control points on each side of the adjusted block. This not only changes the present situation, in which height accuracy is always lower than the planimetric accuracy in aerial triangulation of aerial film images, but also opens up a new prospect in which the orientation points for models for stereoplotting need not be determined by full field surveying for topographic mapping of reasonably flat terrain at medium and large scales. Therefore, this paper provides an operational basis for a broad range of applications for aerial digital imagery in national basic surveying and mapping, and the rapid production and updating of geographic information in general. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2009-207 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29837 [article]

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vol 64 n° 3 - May - June 2009 - Image analysis and image engineering in close range photogrammetry (Bulletin de ISPRS Journal of photogrammetry and remote sensing) / H.G. Maas  

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Assessing geometric reliability of corrected images from very high resolution satellites / M. Aguilar in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 12 (December 2008)

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DMC geometry analysis and virtual image characterisation / R. Alamus in Photogrammetric record, vol 23 n° 124 (December 2008 - February 2009)  

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Analysis of Cartosat-1 images regarding image quality, 3D point measurement and DSM generation / Emmanuel Baltsavias in Photogrammetric record, vol 23 n° 123 (September - November 2008)

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Potential accuracy of image orientation of small satellites: a case study of CHRIS/Proba data / Ahmed Shaker in Photogrammetric record, vol 23 n° 123 (September - November 2008)

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Adjustability and error propagation for true replacement sensor models / C. Puatanachokchai in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 3 (May - June 2008)

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Per-pixel classification of high spatial resolution satellite imagery for urban land-cover mapping / D. Hester in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 4 (April 2008)

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Reducing edge effects in the classification of high resolution imagery / G. Zhou in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 4 (April 2008)

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Etude des images TerraSAR-X / Fabien Coubard (2008)

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Imagerie spatiale / P. Lier (2008)

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