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DEM generation using a digital large format frame camera / Joachim Höhle in Photogrammetric Engineering & Remote Sensing, PERS, vol 75 n° 1 (January 2009)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 75 n° 1 (January 2009) . - pp 87 - 93 Titre : DEM generation using a digital large format frame camera Type de document : Article/Communication Auteurs : Joachim Höhle, Auteur Année de publication : 2009 Article en page(s) : pp 87 - 93 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] chambre à grand format [Termes IGN] image aérienne [Termes IGN] modèle numérique de surface [Termes IGN] photographie à grande échelle [Termes IGN] précision altimétrique [Termes IGN] traitement d'image Résumé : (Auteur) Progress in automated photogrammetric DEM generation is presented. Starting from the procedures and the performance parameters of automated photogrammetric DEM generation, the results of some practical tests with large scale images are presented. The DEMs are derived from images taken by a digital large-frame aerial camera and checked by reference data of superior accuracy. In average, a vertical accuracy of ó h = 13 cm or 0.20 per thousand of the mean flying height above mean terrain has been achieved. Some recent innovations in digital large-frame cameras and in the processing software give hope for even better results. In comparison with results from film-based cameras, it can be stated that both technologies are able to produce very dense and accurate DEMs. Copyright ASPRS Numéro de notice : A2009-009 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.75.1.87 En ligne : https://doi.org/10.14358/PERS.75.1.87 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29639 [article]

Very large scale aerial photography for rangeland monitoring / D.T. Booth in Geocarto international, vol 21 n° 3 (September - November 2006)  

Public [article]  inGeocarto international > vol 21 n° 3 (September - November 2006) . - pp 27 - 34 Titre : Very large scale aerial photography for rangeland monitoring Type de document : Article/Communication Auteurs : D.T. Booth, Auteur ; S.E. Cox, Auteur Année de publication : 2006 Article en page(s) : pp 27 - 34 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] altimètre laser [Termes IGN] caméra numérique [Termes IGN] capteur aérien [Termes IGN] détecteur CMOS [Termes IGN] pas d'échantillonnage au sol [Termes IGN] photographie à grande échelle [Termes IGN] photographie aérienne [Termes IGN] récepteur GPS [Termes IGN] surveillance de la végétation [Termes IGN] Wyoming (Etats-Unis) Résumé : (Auteur) Ecological assessment of ground cover by conventional on-the-ground point sampling is labor intensive, expensive, and biased by access. Historically, motion blur has prevented high-resolution aerial photography from being used for ground cover measurements. To reduce motion blur we used a fixed-wing, 225-kg (empty weight) airplane flown at 72 km/hr ground speed 100 in above ground level with both a modified Hulcher 70 mm camera (500mm lens, Kodak Aerocolor HS SO-846 film, 1/4,000-second shutter speed), and a Canon 11. 1 mega-pixel, automatic, digital single lens reflex, color camera (420 mm focal-length lens). The resulting very-large scale aerial (VLSA) photography had resolutions of 5.0 and 2.1 mm GSD (Ground Sample Distance) for the scanned film and digital-camera images, respectively. Motion blur was minimal. The cost for obtaining 450 VLSA photographs over a 70,800-ha watershed was $0.07 ha. We found our methods well adapted for extensive aerial surveys to monitor the ecological condition of rangeland watersheds. Copyright Geocarto international Numéro de notice : A2006-477 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040608542390 Date de publication en ligne : 04/01/2008 En ligne : https://doi.org/10.1080/10106040608542390 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28201 [article]

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Numérique contre argentique : l'exemple de la caméra DiMAC / J. Losseau in Géomatique expert, n° 41- 42 (01/03/2005)

Public [article]  inGéomatique expert > n° 41- 42 (01/03/2005) . - pp 44 - 48 Titre : Numérique contre argentique : l'exemple de la caméra DiMAC Type de document : Article/Communication Auteurs : J. Losseau, Auteur Année de publication : 2005 Article en page(s) : pp 44 - 48 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] acquisition d'images [Termes IGN] caméra matricielle [Termes IGN] caméra numérique [Termes IGN] capteur aérien [Termes IGN] image à très haute résolution [Termes IGN] instrumentation Dimac [Termes IGN] orthophotoplan numérique [Termes IGN] photographie à grande échelle [Termes IGN] photographie infrarouge couleur [Termes IGN] prise de vue aérienne [Termes IGN] qualité d'image [Termes IGN] recouvrement d'images [Termes IGN] tarif [Termes IGN] traitement d'image Résumé : (documentaliste) Suite à l'avancée technologique, la Société DiMAC s'est lancée à son tour dans le développement d'une caméra numérique pour la photographie à grande échelle. Numéro de notice : A2005-110 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27248 [article]

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True ortho-image production for forested areas from large-scale aerial photographs / Y. Sheng in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 3 (March 2003)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 69 n° 3 (March 2003) . - pp 259 - 266 Titre : True ortho-image production for forested areas from large-scale aerial photographs Type de document : Article/Communication Auteurs : Y. Sheng, Auteur ; P. Gong, Auteur ; Gregory S. Biging, Auteur Année de publication : 2003 Article en page(s) : pp 259 - 266 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Orthophotographie, orthoimage [Termes IGN] correction des ombres [Termes IGN] couvert forestier [Termes IGN] déformation d'image [Termes IGN] dévers [Termes IGN] forêt [Termes IGN] modèle numérique de surface [Termes IGN] objet géographique 3D [Termes IGN] orthoimage [Termes IGN] orthoimage intégrale [Termes IGN] photographie à grande échelle [Termes IGN] photographie aérienne Résumé : (Auteur) An orthophoto is a fundamental information source in forestry. Orthophoto production is usally based on digital elevation models (DEM) ; however, the elevations of 3D objects suchs as buildings and trees, which are visible in large-scale photos, are not included in DEMs. Recently initiated "true orthophoto" generation has been dedicated to urban scenes, removing the displacement caused by both the terrain and buildings. This paper reports an effort on reducing occlusion and distortion caused by trees in true orthoimage generation for forested areas. Canopy surface models (CMS) depicting both the terrain and tree surfaces were used in forest orthoimage production. Z-buffer techniques were incorporated into indirect orthoimage production to remove occlusion. An angle-based strategy was applied to composite multi-occular images. The proposed techniques were applied in the generation of high-resolution orthoimages of redwood stand with 1:2 400-scale aerial photos. Numéro de notice : A2003-029 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.14358/PERS.69.3.259 En ligne : https://doi.org/10.14358/PERS.69.3.259 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22326 [article]

Automatic matching and three-dimensional reconstruction of free-form linear features from stereo images / A.F. Habib in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 2 (February /2003)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 69 n° 2 (February /2003) . - pp 189 - 197 Titre : Automatic matching and three-dimensional reconstruction of free-form linear features from stereo images Type de document : Article/Communication Auteurs : A.F. Habib, Auteur ; Y.R. Lee, Auteur ; M. Morgan, Auteur Année de publication : 2003 Article en page(s) : pp 189 - 197 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie spatiale [Termes IGN] appariement de formes [Termes IGN] contour [Termes IGN] couple stéréoscopique [Termes IGN] courbe épipolaire [Termes IGN] géométrie épipolaire [Termes IGN] milieu urbain [Termes IGN] objet géographique linéaire [Termes IGN] photographie à grande échelle [Termes IGN] reconstruction 3D du bâti [Termes IGN] transformation de Hough Résumé : (Auteur) Automatic matching of freeform linear features in overlapping largescale imagery over urban areas still remains to be a problem in both the photogrammetric and computer vision communities. Although there is a variety of algorithms that have been developed to solve this problem, reliable results are not always guaranteed. Differences in illumination conditions, relief displacement, and occlusions are some of the factors that make solving the matching problem more challenging. The deficiency of available techniques stems from the fact that they do not consider the perspective geometry of the imaging system in the matching process. Moreover, it is usually assumed that conjugate entities are almost exact copies of each other (this is rarely the case). The need for a reliable algorithm that can handle largescale imagery over urban areas is growing, especially with the increasing availability of high resolution aerial imagery. In this research, a new approach for automatic matching and threedimensional reconstruction of freeform linear features from stereo images is proposed. The suggested strategy is based on The Modified Iterated Hough Transform (MIHT) for Robust Parameter Estimation, MIHT relies on the mathematical relationship between conjugate entities (the coplanarity condition when dealing with a stereo pair). As a result, it overcomes problems arising from relief displacements and/or occlusions. Moreover, MIHT simultaneously solves for the relative orientation parameters as well as the correspondence between conjugate entities in a stereo pair. Matching ambiguities along and across conjugate epipolar lines are observed in the correspondence output from MIHT. Ambiguities along the epipolar lines stem from the nature of the coplanarity model, which establishes the correspondence between conjugate epipolar lines rather than conjugate points. On the other hand, ambiguities across the epipolar lines are expected due to the discrete cell size of the implemented accumulator array in MIHT. In this work, the ambiguities are resolved through several pruning techniques such as correlation coefficient, edge connectivity, height information, and epipolar geometry. Conjugate entities with subpixel accuracy are finally used to reconstruct accurate and reliable threedimensional imagespace discontinuities. Various experiments using largescale imagery over urban areas proved the reliability and robustness of the proposed method. Numéro de notice : A2003-014 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.69.2.189 En ligne : https://doi.org/10.14358/PERS.69.2.189 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22312 [article]

Geo-information through photogrammetry: effectiveness factors in mapping from large-scale images / B. Makarovic in GIM international, vol 16 n° 9 (September 2002)

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Automatic relative orientation of large scale imagery over urban areas using modified Iterated Hough transform / A. Habib in ISPRS Journal of photogrammetry and remote sensing, vol 56 n° 1 (May - June 2001)  

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Contribution à la reconstruction du bâti en milieu urbain, à l'aide d'images aériennes stéréoscopiques à grande échelle / Frank Fuchs (2001)  

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Approximation des profondeurs d'une scène urbaine à partir d'images à grande échelle / A. Benzenati (1997)

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Elaboration d'une interface homme machine, pour l'étude de modèles paramétriques de bâtiments sur des couples stéréoscopiques d'images aériennes à grande échelle / F. Thierry (1997)

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Reconstruction de bâtiments à partir d'images aériennes à grandes échelles et de données stéréoscopiques / C. Frisch (1996)

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Simplification and generalization of large scale data for roads: a comparison of two filtering algorithms / M. Visvalingam in Cartography and geographic information systems, vol 22 n° 4 (December 1995)  

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Map revision from stereo-orthophotographs / M.J. Ali in Photogrammetric record, vol 12 n° 72 (October 1988 - March 1989)  

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Microlight aircraft for radiometric surveying applied to land resources assessment and monitoring in Mali (West Africa) / J.M. Gregoire in Photogrammetria, vol 43 n° 1 (September 1988)

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Canadian large-scale aerial photographic systems (LSP) / R.D. Spencer in Photogrammetric Engineering & Remote Sensing, PERS, vol 54 n° 4 (april 1988)  

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