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True orthoimages: recovering full 100 per cent scenes using digital surface models / W. Mayr in GIM international, vol 16 n° 4 (April 2002)

Public [article]  inGIM international > vol 16 n° 4 (April 2002) . - pp 37 - 39 Titre : True orthoimages: recovering full 100 per cent scenes using digital surface models Type de document : Article/Communication Auteurs : W. Mayr, Auteur Année de publication : 2002 Article en page(s) : pp 37 - 39 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Orthophotographie, orthoimage [Termes IGN] coût [Termes IGN] modèle numérique de surface [Termes IGN] modèle stéréoscopique [Termes IGN] orthoimage intégrale [Termes IGN] recouvrement d'images [Termes IGN] scène Résumé : (Auteur) In many GIS applications, background images enrich the presentation or are used for data capture. Geometrically, such images possess a defined, homogeneous geometry. They are orthophotos. The most accurate and expensive orthophotos are True OrthoImages (TOI), which represent object space truly. TOI generation requires a set of overlapping images which together provide 100 per cent visibility of scene, a Digital Surface Model (DSM) and proper geometric and radiometric processing of occluded areas. DSM data capture accounts for about 90+ per cent of costs and makes TOI genration rather expensive. The author elaborates upon the significance and generation of TOIs and discusses technique to reduce the cost of DSM data collection. Copyright GITC Numéro de notice : A2002-230 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22144 [article]

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Zur Verfahrensdisposition bei der Digitalen Orthoprojektion / W. Mayr (1994)

Public Titre : Zur Verfahrensdisposition bei der Digitalen Orthoprojektion Titre original : [Pour la disposition de procédés lors de l'orthoprojection numérique] Type de document : Thèse/HDR Auteurs : W. Mayr, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1994 Collection : DGK - C Sous-collection : Dissertationen num. 416 Importance : 91 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9460-4 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] orthophotoplan numérique Index. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) Digital orthoprojection (DOP) is a purely mathematical method for digital image transformation. Images of a known geometry, which are stored in the form of digital data, are transformed into a vertical parallel projection, i.e. an orthophoto, using their orientation parameters and the corresponding digital terrain model (DTM). To permit the successful practical implementation of DOP and, as a result, one of the first applications of digital photogrammetry (DP), investigations have been made with regard to process engineering and the possibilities of optimizing the algorithms of DOP. The present thesis starts by describing the theoretical principles of DOP and presents a new approach. Generally speaking, DOP permits rigorous allowance to be made for high-precision DTMs - a clear advantage offered by DOP over analytical orthoprojection. Mosaicking becomes an integral part of DOP. The new mosaicking technique described here is based on image pyramids and image filtering. This is followed by a practical section in which the possibilities of optimizing the DOP method are discussed. For this, different versions of the geometric and radiometric components are tested on various computer systems. A wide spectrum of computer systems ranging from the supercomputer to the PC is available for this purpose. The examples given demonstrate that, even at this stage, DOP can be economically operated on workstations. The subsequent chapter describes various aspects of process engineering in DOP. Since the integration of scanners into the DOP process is essential for several reasons, they are used as a basis for discussing the problems of data quantities, data conversion, data compression, data storage and data output. Several instruments are dealt with as examples for data output. Image orientation data, DTM data and quality control are further important subjects investigated here. The use of texture mapping from the field of computer graphics opens up a further new possibility for orthoprojection, with the DOP being displayed on standard hardware from the computer graphics industry. The requirements and capabilities of texture mapping in DP are presented and provide interesting new prospects. The main part of the thesis is concluded by selected examples. Mosaicking is demonstrated using image material in black-and-white and colour. Examples of extreme scale ratios of the source image to the orthophoto prove the suitability of DOP for such applications. The content of the image detfermines in this case whether a high or low resolution is used for scanning. The scanner is of paramount importance here. The main conclusion to be drawn from the present thesis is the suitability of DOP for practical use. Compared with previous techniques, DOP offers clear benefits not only due to the possibility of easy mosaicking. Orthophotos are also, for example, an ideal supplement to geographic information systems. DOP is therefore expected to give a major boost to the acceptance of DP. Numéro de notice : 28069 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63416

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SIR-B stereo-radargrammetry of Australia / Franz W. Leberl in International Journal of Remote Sensing IJRS, vol 9 n° 5 (May 1988)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 9 n° 5 (May 1988) . - pp 997 - 1011 Titre : SIR-B stereo-radargrammetry of Australia Type de document : Article/Communication Auteurs : Franz W. Leberl, Auteur ; W. Mayr, Auteur ; G. Domik, Auteur ; M. Kobrick, Auteur Année de publication : 1988 Article en page(s) : pp 997 - 1011 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] Australie [Termes IGN] éclairement énergétique [Termes IGN] image radar [Termes IGN] image SIR-B [Termes IGN] radargrammétrie [Termes IGN] simulation d'image [Termes IGN] stéréoscopie Numéro de notice : A1988-181 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431168808954909 En ligne : https://doi.org/10.1080/01431168808954909 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=24760 [article]

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