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Approximate direct georeferencing in national coordinates / Klaus Legat in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 4 (June - July 2006)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 60 n° 4 (June - July 2006) . - pp 239 - 255 Titre : Approximate direct georeferencing in national coordinates Type de document : Article/Communication Auteurs : Klaus Legat, Auteur Année de publication : 2006 Article en page(s) : pp 239 - 255 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] coordonnées cartésiennes géocentriques [Termes IGN] élément d'orientation externe [Termes IGN] géoréférencement direct [Termes IGN] GPS-INS [Termes IGN] projection [Termes IGN] transformation de coordonnées Résumé : (Auteur) Direct georeferencing has gained an increasing importance in photogrammetry and remote sensing. Thereby, the parameters of exterior orientation (EO) of an image sensor are determined by GPS/INS, yielding results in a global geocentric reference frame. Photogrammetric products like digital terrain models or orthoimages, however, are often required in national geodetic datums and mapped by national map projections, i.e., in “national coordinates”. As the fundamental mathematics of photogrammetry is based on Cartesian coordinates, the scene restitution is often performed in a Cartesian frame located at some central position of the image block. The subsequent transformation to national coordinates is a standard problem in geodesy and can be done in a rigorous manner–at least if the formulas of the map projection are rigorous. Drawbacks of this procedure include practical deficiencies related to the photogrammetric processing as well as the computational cost of transforming the whole scene. To avoid these problems, the paper pursues an alternative processing strategy where the EO parameters are transformed prior to the restitution. If only this transition was done, however, the scene would be systematically distorted. The reason is that the national coordinates are not Cartesian due to the earth curvature and the unavoidable length distortion of map projections. To settle these distortions, several corrections need to be applied. These are treated in detail for both passive and active imaging. Since all these corrections are approximations only, the resulting technique is termed “approximate direct georeferencing”. Still, the residual distortions are usually very low as is demonstrated by simulations, rendering the technique an attractive approach to direct georeferencing. Copyright ISPRS Numéro de notice : A2006-280 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.02.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.02.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28007 [article]

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Absolute position estimation using IRS satellite images / Y.S. Oh in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 4 (June - July 2006)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 60 n° 4 (June - July 2006) . - pp 256 - 268 Titre : Absolute position estimation using IRS satellite images Type de document : Article/Communication Auteurs : Y.S. Oh, Auteur ; D.G. Sim, Auteur ; R.H. Park, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 256 - 268 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] appariement d'images [Termes IGN] détection de contours [Termes IGN] erreur de positionnement [Termes IGN] image aérienne [Termes IGN] image IRS [Termes IGN] position [Termes IGN] positionnement absolu [Termes IGN] superposition d'images [Termes IGN] transformation de Hough Résumé : (Auteur) This paper presents an absolute position estimation method using an Indian remote sensing (IRS) satellite images, which is a part of a position estimation system. The accumulated buffer (AB) matching method is proposed, in which a set of accumulator cells is employed for a fast edge-based matching between IRS satellite images and aerial images. The proposed algorithm is based on the accumulated buffer, which is a set of accumulator cells employed in the Hough transform widely used for robust detection of lines or curves. Thanks to the inherent robustness of the proposed algorithm, accurate registration can be accomplished between totally different image modalities. By computer simulations with two sets of real aerial image sequences, the performance of the AB matching method is analyzed and its effectiveness is shown in terms of the position error in the hybrid position estimation system. We found that the proposed AB matching method significantly reduces the average position error produced by the relative position estimation in the hybrid position estimation system. Copyright ISPRS Numéro de notice : A2006-281 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.03.003 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.03.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28008 [article]

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Recent developments on direct relative orientation / H. Stewenius in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 4 (June - July 2006)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 60 n° 4 (June - July 2006) . - pp 284 - 294 Titre : Recent developments on direct relative orientation Type de document : Article/Communication Auteurs : H. Stewenius, Auteur ; C. Engels, Auteur ; D. Nister, Auteur Année de publication : 2006 Article en page(s) : pp 284 - 294 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] analyse comparative [Termes IGN] Matlab [Termes IGN] matrice [Termes IGN] orientation relative [Termes IGN] transformation polynomiale [Termes IGN] vecteur propre Résumé : (Auteur) This paper presents a novel version of the five-point relative orientation algorithm given in Nister [Nister, D., 2004. An efficient solution to the five-point relative pose problem, IEEE Transactions on Pattern Analysis and Machine Intelligence, 26 (6), 756–770]. The name of the algorithm arises from the fact that it can operate even on the minimal five-point correspondences required for a finite number of solutions to relative orientation. For the minimal five correspondences, the algorithm returns up to 10 real solutions. The algorithm can also operate on many points. Like the previous version of the five-point algorithm, our method can operate correctly even in the face of critical surfaces, including planar and ruled quadric scenes. The paper presents comparisons with other direct methods, including the previously developed five-point method, two different six-point methods, the seven-point method, and the eight-point method. It is shown that the five-point method is superior in most cases among the direct methods. The new version of the algorithm was developed from the perspective of algebraic geometry and is presented in the context of computing a Gröbner basis. The constraints are formulated in terms of polynomial equations in the entries of the fundamental matrix. The polynomial equations generate an algebraic ideal for which a Gröbner basis is computed. The Gröbner basis is used to compute the action matrix for multiplication by a single variable monomial. The eigenvectors of the action matrix give the solutions for all the variables and thereby also relative orientation. Using a Gröbner basis makes the solution clear and easy to explain. Copyright ISPRS Numéro de notice : A2006-282 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.03.005 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.03.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28009 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-06041	SL	Revue	Centre de documentation	Revues en salle	Disponible