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Terrestrial laser scanning for use in virtual outcrop geology / S.J. Buckley in Photogrammetric record, vol 25 n° 131 (September - November 2010)  

Public [article]  inPhotogrammetric record > vol 25 n° 131 (September - November 2010) . - pp 225 - 239 Titre : Terrestrial laser scanning for use in virtual outcrop geology Type de document : Article/Communication Auteurs : S.J. Buckley, Auteur ; H. Enge, Auteur ; C. Carlsson, Auteur ; John Howell, Auteur Année de publication : 2010 Article en page(s) : pp 225 - 239 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] données géologiques [Termes IGN] données lidar [Termes IGN] géologie locale [Termes IGN] image à très haute résolution [Termes IGN] prospection minérale [Termes IGN] semis de points [Termes IGN] simulation [Termes IGN] télémétrie laser terrestre [Termes IGN] texturage [Termes IGN] Utah (Etas-Unis) Résumé : (Auteur) This paper discusses the application of laser scanning and photo-realistic modelling to aid the study of geological outcrops, using two examples from central and eastern Utah, USA, which are analogues to subsurface hydrocarbon fields. Terrestrial laser scanning point clouds were triangulated to obtain high-resolution surface representations, which were combined with semi-metric imagery to give texture-mapped photo-realistic models of the outcrops. Such models provide the basis for geological interpretation and were used to reconstruct the geometries of layers over the extent of the study area. The digitised geological layers were in turn used to build geocellular volumes that capture the properties of the geology. These models were built in subsurface reservoir modelling software and were used to simulate the flow of fluids through the reservoir analogue. In this way, the spatial information provided significantly more detailed quantitative data and greatly improved the outcrop studies compared to traditional field techniques. Numéro de notice : A2010-380 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2010.00572.x En ligne : https://doi.org/10.1111/j.1477-9730.2010.00572.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30574 [article]

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Applying close range digital photogrammetry in soil erosion studies / B. Heng in Photogrammetric record, vol 25 n° 131 (September - November 2010)  

Public [article]  inPhotogrammetric record > vol 25 n° 131 (September - November 2010) . - pp 240 - 265 Titre : Applying close range digital photogrammetry in soil erosion studies Type de document : Article/Communication Auteurs : B. Heng, Auteur ; Jim H. Chandler, Auteur ; A. Armstrong, Auteur Année de publication : 2010 Article en page(s) : pp 240 - 265 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] analyse comparative [Termes IGN] érosion hydrique [Termes IGN] image oblique [Termes IGN] microtopographie [Termes IGN] modèle numérique de terrain [Termes IGN] photogrammétrie métrologique [Termes IGN] photogrammétrie terrestre [Termes IGN] télémétrie laser terrestre Résumé : (Auteur) Soil erosion due to rainfall and overland flow is a significant environmental problem. Studying the phenomenon requires accurate high-resolution measurements of soil surface topography and morphology. Close range digital photogrammetry with an oblique convergent configuration is proposed in this paper as a useful technique for such measurements, in the context of a flume-scale experimental study. The precision of the technique is assessed by comparing triangulation solutions and the resulting DEMs with varying tie point distributions and control point measurements, as well as by comparing DEMs extracted from different images of the same surface. Independent measurements were acquired using a terrestrial laser scanner for comparison with a DEM derived from photogrammetry. The results point to the need for a stronger geometric configuration to improve precision. They also suggest that the camera lens models were not fully adequate for the large object depths in this study. Nevertheless, the photogrammetric output can provide useful topographical information for soil erosion studies, provided limitations of the technique are duly considered. Numéro de notice : A2010-381 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2010.00584.x Date de publication en ligne : 15/09/2010 En ligne : https://doi.org/10.1111/j.1477-9730.2010.00584.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30575 [article]

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3D ichnology-recovering digital 3D models of dinosaur footprints / Fabio Remondino in Photogrammetric record, vol 25 n° 131 (September - November 2010)  

Public [article]  inPhotogrammetric record > vol 25 n° 131 (September - November 2010) . - pp 266 - 282 Titre : 3D ichnology-recovering digital 3D models of dinosaur footprints Type de document : Article/Communication Auteurs : Fabio Remondino, Auteur ; A. Rizzi, Auteur ; S. Girardi, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 266 - 282 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] appariement d'images [Termes IGN] dinosaure [Termes IGN] empreinte [Termes IGN] fossile [Termes IGN] photogrammétrie métrologique [Termes IGN] reconstruction 3D Résumé : (Auteur) Ichnology deals with the traces of prehistoric organisms and thus with the study of dinosaur footprints and tracks. This paper reports on a reliable and precise methodology developed to integrate high-resolution close range photogrammetry and range sensors for 3D surveys of dinosaur footprints. The 3D footprint and track models recovered here yield a great deal of accurate morphological and morphometrical information, providing palaeoichnologists with a simpler and cheaper way to document track fossils and the opportunity to formulate new hypotheses about the dynamics of dinosaur locomotion. Numéro de notice : A2010-382 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2010.00587.x Date de publication en ligne : 15/11/2010 En ligne : https://doi.org/10.1111/j.1477-9730.2010.00587.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30576 [article]

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A digital medium-format camera for metric applications: Alpa 12 metric / D. Rieke-Zapp in Photogrammetric record, vol 25 n° 131 (September - November 2010)  

Public [article]  inPhotogrammetric record > vol 25 n° 131 (September - November 2010) . - pp 283 - 298 Titre : A digital medium-format camera for metric applications: Alpa 12 metric Type de document : Article/Communication Auteurs : D. Rieke-Zapp, Auteur Année de publication : 2010 Article en page(s) : pp 283 - 298 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] chambre métrique [Termes IGN] étalonnage de chambre métrique [Termes IGN] photogrammétrie terrestre [Termes IGN] précision géométrique (imagerie) Résumé : (Auteur) The Alpa 12 Metric, a medium-format digital camera system, is presented along with an accuracy assessment in accordance with VDI/VDE 2634 (2002). The camera combines the advantages of a modular medium-format camera system with high accuracy in object space. Camera calibration revealed a maximum length measurement error of 0·043 mm for a lens with mechanically fixed focusing distance and 0·063 mm for a lens where the focusing ring was taped during image acquisition. Only in the latter case did the maximum length measuring error improve, yielding 0·050 mm when calibrated with image-variant parameters of interior orientation. A bias towards positive length measurement errors indicated that the set-up for calibration could be improved and that even better accuracy in object space may be accomplished. The Alpa 12 camera system provides several unique features including lenses with fixed displacement of the principal point for terrestrial and other special applications, rigid tilt adaptors for Scheimpflug correction, shim kits for the fine adjustment of flange focal distance as well as the possibility of mounting a monochrome digital medium-format back, sensitive to visible and near infrared light. The camera is well suited for terrestrial applications requiring high accuracy and/or large pixel counts. Numéro de notice : A2010-383 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2010.00586.x Date de publication en ligne : 15/09/2010 En ligne : https://doi.org/10.1111/j.1477-9730.2010.00586.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30577 [article]

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Assessment of erosion, deposition and rill development on irregular soil surfaces using close range digital photogrammetry / G. Gessesse in Photogrammetric record, vol 25 n° 131 (September - November 2010)  

Public [article]  inPhotogrammetric record > vol 25 n° 131 (September - November 2010) . - pp 299 - 318 Titre : Assessment of erosion, deposition and rill development on irregular soil surfaces using close range digital photogrammetry Type de document : Article/Communication Auteurs : G. Gessesse, Auteur ; H. Fuchs, Auteur ; Reinfried Mansberger, Auteur ; A. Kik, Auteur ; D. Rieke-Zapp, Auteur Année de publication : 2010 Article en page(s) : pp 299 - 318 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] données localisées 3D [Termes IGN] érosion hydrique [Termes IGN] microtopographie [Termes IGN] modèle numérique de surface [Termes IGN] photogrammétrie métrologique [Termes IGN] photogrammétrie terrestre [Termes IGN] pluie [Termes IGN] point d'appui [Termes IGN] rugosité du sol [Termes IGN] ruissellement [Termes IGN] transport sédimentaire Résumé : (Auteur) Understanding the spatial pattern of erosion in inter-rill and rill areas can be useful in locating sources of sediment and in determining down-slope sediment delivery. However, spatial information about erosion processes in the inter-rill and rill areas under field conditions is often limited owing to the non-availability of a detailed microtopography. This paper aims to present a method for the survey of microtopographic soil surface changes caused by erosion and to investigate the development of sediment transport and rill erosion in the inter-rill and rill areas for a given rainfall event. The approach is based on the application of close range digital photogrammetry to produce differences of digital elevation models (DEMs), automatically measured and generated but with manual 3D point editing. Quality analysis of the DEM measurements has shown that erosion and deposition can be detected with a relative error of 12·8 to 15·3mm. The minimum average sediment yield from plots with an area of 53m2after the occurrence of 46 to 70mm of erosive rainfall was estimated to be 1·24 to 3·5kgm-2. The spatial pattern of erosion and deposition on inter-rill and rill areas has proved the relative efficiency of rills to transport sediments from inter-rill areas with a sediment delivery ratio greater than one. Thus at erosive rainfall events, the transport capacity of the rill flow was not a limiting condition. The rill network was controlled by abrupt change in surface microtopography where rough surfaces produced many smaller rills but fewer contributing rills than relatively smooth surfaces. Tillage-induced surface roughness, the presence of stones and sparse vegetation, and the borders of individual plots were found to present challenges to the photogrammetric techniques, and to introduce errors which inhibit fully automatic DEM generation. The precision of the DEMs was constrained by the precision of ground control points (GCPs), camera lens distortion towards format edges and DEM extraction parameters. Despite this limitation, however, the application of digital photogrammetry enabled the measurement of high-frequency microtopographic surfaces and characterisation of the spatial distribution of erosion and deposition and of rill erosion development during highly erosive rainfall events. Numéro de notice : A2010-384 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2010.00588.x Date de publication en ligne : 15/09/2010 En ligne : https://doi.org/10.1111/j.1477-9730.2010.00588.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30578 [article]

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