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A robust technique for precise registration of radar and optical satellite images / T.D. Hong in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 5 (May 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 5 (May 2005) . - pp 585 - 593 Titre : A robust technique for precise registration of radar and optical satellite images Type de document : Article/Communication Auteurs : T.D. Hong, Auteur ; R.A. Schowengerdt, Auteur Année de publication : 2005 Article en page(s) : pp 585 - 593 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image mixte [Termes IGN] contour [Termes IGN] fusion de données [Termes IGN] gradient [Termes IGN] image ERS-SAR [Termes IGN] image Landsat-TM [Termes IGN] image multicapteur [Termes IGN] image optique [Termes IGN] image radar [Termes IGN] intégration de données [Termes IGN] méthode robuste [Termes IGN] point de canevas [Termes IGN] précision des données [Termes IGN] scène [Termes IGN] superposition d'images Résumé : (Auteur) Combining data from different sensors for visual or classification analysis is a common task in remote sensing. The first step is normally to register the images which may be considered geometric integration; the accuracy of this step is important to create a valuable final hybrid image. This paper addresses geometric integration and introduces a new method for automatically registering two dissimilar images, such as, a radar image and an optical image with high accuracy. Pre-registration of the two images to within a specified tolerance is required. In our examples, this tolerance is up to 17 pixels (at the scale of the higher resolution image) and may be achieved by, for example, visually located control points. The described approach then uses large-scale edge gradient contours in a process that automatically locates candidate control points on the contours. The points are selected using a cost function that measures the degree of match between all possible pairs of points. Numerous control points (typically around 50 pairs) are found from matched pairs of gradient contours and use in a global, rubber sheet, polynomial warp to refine the registration. This approach is applied to register a Synthetic Aperture Radar (SAR) image (ERS2, 12.5 m pixels) and a Thematic Mapper (TM) optical image (Landsat-5, 28.5 m pixels) automatically. Several examples with different scene content are shown to validate the approach and discussed in terms of residual registration error and processing efficiency. Numéro de notice : A2005-181 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : https://doi.org/10.14358/PERS.71.5.585 En ligne : https://doi.org/10.14358/PERS.71.5.585 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27318 [article]

Implementation of an equal-area gridding method for global-scale image archiving / J.C. Seong in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 5 (May 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 5 (May 2005) . - pp 623 - 627 Titre : Implementation of an equal-area gridding method for global-scale image archiving Type de document : Article/Communication Auteurs : J.C. Seong, Auteur Année de publication : 2005 Article en page(s) : pp 623 - 627 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] archivage électronique [Termes IGN] base de données d'images [Termes IGN] C++ [Termes IGN] couche thématique [Termes IGN] données maillées [Termes IGN] implémentation (informatique) [Termes IGN] maillage [Termes IGN] projection Résumé : (Auteur) Constructing global-scale image databases is a challenging task because of large data volume and various map distortions. The raster pixel data structure on a projected flat surface has been used frequently; however, research shows that it may duplicate or lose original features. For a more accurate image-database construction method, this research investigated an equal-area global gridding method. An extended header structure was developed that allows facet indexing using geographic latitude and longitude. Three algorithms were developed in a C/C++ programming environment that performs new layer creation, accessing facet values, and importing image data in other projections. The output of this research can be considered for archiving global-scale satellite imagery and for publishing global-scale thematic raster datasets such as land cover and population density. Numéro de notice : A2005-182 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.71.5.623 En ligne : https://doi.org/10.14358/PERS.71.5.623 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27319 [article]

Influence of system calibration on direct sensor orientation / N. Yastikli in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 5 (May 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 5 (May 2005) . - pp 629 - 633 Titre : Influence of system calibration on direct sensor orientation Type de document : Article/Communication Auteurs : N. Yastikli, Auteur ; Karsten Jacobsen, Auteur Année de publication : 2005 Article en page(s) : pp 629 - 633 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] antenne GPS [Termes IGN] erreur aléatoire [Termes IGN] erreur systématique [Termes IGN] étalonnage d'instrument [Termes IGN] étalonnage de capteur (imagerie) [Termes IGN] GPS-INS [Termes IGN] ligne de visée [Termes IGN] modèle mathématique [Termes IGN] orientation du capteur [Termes IGN] orientation interne [Termes IGN] positionnement par GPS [Termes IGN] système de coordonnées Résumé : (Auteur) The determination of object coordinates based on direct sensor orientation is an extrapolation from the projection centers to the ground coordinate system. Like any extrapolation, it is sensitive to random and systematic errors, as well as, to improper data handling. Direct sensor orientation is based on the combination of an Inertial Measurement System (IMU) and GPS. The GPS antenna, the IMU, and the imaging sensor are located in different positions, and the latter two have different orientations. Therefore, the calibration of all sensors and the relation between the sensors is of vital importance for precise ground positioning. The system calibration includes the determination of the boresight misalignment, the interior camera orientation, and the GPS antenna offset. A rigorous mathematical model is required. The inner orientation of the camera used has to be determined under flight conditions to achieve sufficient results. In this paper, the influence of the system calibration to the direct sensor orientation and improper data handling will be shown. Numéro de notice : A2005-183 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.71.5.629 En ligne : http://dx.doi.org/10.14358/PERS.71.5.629 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27320 [article]