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Using horizontal and vertical building structure to constrain indirect sensor orientation / Markus Gerke in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 3 (May - June 2011)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 66 n° 3 (May - June 2011) . - pp 307 - 316 Titre : Using horizontal and vertical building structure to constrain indirect sensor orientation Type de document : Article/Communication Auteurs : Markus Gerke, Auteur Année de publication : 2011 Article en page(s) : pp 307 - 316 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] bâtiment [Termes IGN] compensation par faisceaux [Termes IGN] contour [Termes IGN] étalonnage de capteur (imagerie) [Termes IGN] géoréférencement indirect [Termes IGN] image aérienne oblique [Termes IGN] orientation du capteur [Termes IGN] point d'appui [Termes IGN] programmation par contraintes [Termes IGN] scène [Termes IGN] séquence d'images [Termes IGN] Ultra Léger Motorisé Résumé : (Auteur) This paper presents a method to integrate linear horizontal, vertical and right-angled scene structures into the bundle adjustment of image sequences. An increasing number of airborne image acquisition systems is available and equipped with non-metric small- or medium-frame cameras and no or insufficiently accurate INS devices. In cases where the data is to be used for the production of geo-spatial data, where a certain accuracy and precision is required, an indirect sensor orientation, possibly including self-calibration, needs to be performed. The idea which led to the presented approach is to reduce the number of GCPs necessary for this task by applying the mentioned scene structures. The method directly uses the linear structures, visible at man-made objects as fictive observations within the adjustment, while self-calibration of intrinsic camera parameters and lens distortion is included as well. Experiments with two datasets demonstrate that, through this method, only limited GCP information is required to obtain satisfactory results. In fact, in one experiment using oblique images, several scene constraints were provided and only the datum was defined by ground control. The residuals at check points from this setup were similar to the traditional case where several well-distributed GCPs were available in the scene. In the second experiment the ability of this approach to support the bundle adjustment was shown for a UAV dataset. Although no GCP and camera calibration information was available, the visual inspection of adjusted object points and the residuals at horizontal structures confirmed the ability of the method to align an image block with the structure, as embodied in the defined scene constraints. Despite the convincing outcome of the experiments, it needs to be mentioned that some manual work is still involved in defining the constraints. In future work the issue of automation will be addressed. Numéro de notice : A2011-114 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2010.11.002 En ligne : https://doi.org/10.1016/j.isprsjprs.2010.11.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30894 [article]

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Multitemporal laser scanner-based observation of the Mt. Vesuvius crater: Characterization of overall geometry and recognition of landslide events / Arianna Pesci in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 3 (May - June 2011)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 66 n° 3 (May - June 2011) . - pp 327 - 336 Titre : Multitemporal laser scanner-based observation of the Mt. Vesuvius crater: Characterization of overall geometry and recognition of landslide events Type de document : Article/Communication Auteurs : Arianna Pesci, Auteur ; Giordano Teza, Auteur ; P. De Martino, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 327 - 336 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] analyse diachronique [Termes IGN] caldeira [Termes IGN] détection de changement [Termes IGN] données lidar [Termes IGN] effondrement de terrain [Termes IGN] éruption volcanique [Termes IGN] Italie [Termes IGN] photogrammétrie terrestre [Termes IGN] surveillance géologique [Termes IGN] télémétrie laser terrestre [Termes IGN] Vésuve (volcan) [Termes IGN] volcan Résumé : (Auteur) Results of observations of the Mt. Vesuvius caldera, carried out by means of terrestrial laser scanning (TLS) in May 2005, October 2006 and June 2009, are reported here. In each survey the whole crater was acquired with 17/20 scans from 6 different viewpoints and the corresponding digital surface models were generated and registered into the UTM-WGS84 reference frame. In this way, a comparison between the multitemporal models leads to an evaluation of the occurred changes. The deformation maps, i.e. the contouring plots of the differences between the models along the direction of maximum variations, showed a progressive mass loss due to rock-falls from the NE vertical crater wall whose area was about 5000m2. The TLS data also showed the accumulation at the bottom. The volume loss which occurred from 2005 to 2009, was computed by subtraction of volumes defined with respect to reference planes parallel to the caldera walls and was estimated to be 20300m3. The volume uncertainties due to registration errors, subsampling noise effects, and effects due to choice of the reference plane, were also estimated. Some results were also interpreted on the basis of micro-seismic and meteorological data in order to plan a monitoring technique where seismic signals related to rock-fall and/or signals of intense rainfalls are used as alarms for fast TLS surveys able to characterize the corresponding changes of the caldera walls. The proposed methodology, in particular the simple but effective approach used in the estimation of volume uncertainties, can be applied to each rock slope instability phenomenon, regardless of the particular environment. Numéro de notice : A2011-115 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2010.12.002 En ligne : https://doi.org/10.1016/j.isprsjprs.2010.12.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30895 [article]

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Image fusion by spatially adaptive filtering using downscaling cokriging / E. Pardo-Iguzquiza in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 3 (May - June 2011)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 66 n° 3 (May - June 2011) . - pp 337 - 346 Titre : Image fusion by spatially adaptive filtering using downscaling cokriging Type de document : Article/Communication Auteurs : E. Pardo-Iguzquiza, Auteur ; V. Rodriguez-Galiano, Auteur ; V. Chica-Olmo, Auteur ; P. Atkinson, Auteur Année de publication : 2011 Article en page(s) : pp 337 - 346 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] filtrage numérique d'image [Termes IGN] fusion d'images [Termes IGN] image Landsat-TM [Termes IGN] interpolation non-linéaire [Termes IGN] krigeage [Termes IGN] lissage de données [Termes IGN] qualité géométrique (image) Résumé : (Auteur) The aim of this paper was to extend the method of downscaling cokriging for image fusion by making the method spatially adaptive in that the filter parameters (cokriging weights) can change across the image. The method can adapt itself to the usual statistical non-homogeneity (spatially variable mean, variance and correlation length) of a satellite sensor image that covers an area with different spatial patterns of geographical objects or different terrain types. The solution adopted was to estimate the models of covariances and cross-covariances (or semivariograms and cross-semivariograms) by the same procedure as described in Pardo-Iguzquiza et al. (2006) but with the method applied locally instead of globally. The correct implementation of this local estimation is the key for computational feasibility and prediction efficiency. Two parameters to be taken into account are the grid of locations on which a moving window is centred (local modelling is performed inside this window) and the size of this moving window. With respect to the latter parameter, there is a trade-off between a size small enough to make the procedure locally adaptive and large enough to produce reliable statistical estimates. The computational burden will impose limits to the distance between grid points on which the local moving window is centred. A case study with Landsat ETM+ images was used to show the implementation of the method and the result was evaluated using several statistics widely used for assessing the quality of a fused image, apart from its visual appearance. Numéro de notice : A2011-116 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2011.01.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2011.01.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30896 [article]

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A new pan-sharpening method using multiobjective particle swarm optimization and the shiftable contourlet transform / J. Saeedi in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 3 (May - June 2011)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 66 n° 3 (May - June 2011) . - pp 365 - 381 Titre : A new pan-sharpening method using multiobjective particle swarm optimization and the shiftable contourlet transform Type de document : Article/Communication Auteurs : J. Saeedi, Auteur ; K. Faez, Auteur Année de publication : 2011 Article en page(s) : pp 365 - 381 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] détection de contours [Termes IGN] histogramme [Termes IGN] image à basse résolution [Termes IGN] image à moyenne résolution [Termes IGN] image Landsat-ETM+ [Termes IGN] image multibande [Termes IGN] image Quickbird [Termes IGN] image Worldview [Termes IGN] optimisation (mathématiques) [Termes IGN] pansharpening (fusion d'images) Résumé : (Auteur) In this paper, a novel approach based on multiobjective particle swarm optimization (MOPSO) is presented for panchromatic (Pan) sharpening of a multispectral (MS) image. This new method could transfer spatial details of the pan image into a high-resolution version of the MS image, while color information from the low-resolution MS image is well preserved. The pan and MS images are locally different because of different resolutions, and therefore we cannot directly combine them in the spatial domain. For this reason, we generate two initial results, which are more appropriate for a weighted combination. First, the pan and the MS images are histogram matched. Then we use the shiftable contourlet transform (SCT) to decompose the histogram-matched pan and MS images. The SCT is a new shiftable and modified version of the contourlet transform. In this step, an algorithm based on the SCT is used to generate two initial results of the high-resolution MS images. Our objective is to produce two modified high-resolution MS images, in which one has high spatial similarity to the pan image and the other one has high radiometric quality in each band. Therefore, we have used two different fusion rules to integrate the high-frequency contourlet coefficients of the pan and MS images to generate two initial results of high-resolution MS image or the pan-sharpened (PS) image. Finally, we can find the optimal PS image by applying the MOPSO algorithm and using the two initial PS results. Specifically, the PS image is obtained via a weighted combination of the two initial results, in which the weights are locally estimated via a multiobjective particle swarm optimization algorithm to generate a PS image with high spatial and radiometric qualities. Based on experimental results obtained, the produced pan-sharpened image also has good spectral quality. The efficiency of the proposed method is tested by performing pan-sharpening of high-resolution (Quickbird and Wordview2) and medium-resolution (Landsat-7 ETM +) datasets. Extensive comparisons with the state-of-the-art pan-sharpening algorithms indicate that our new method provides improved subjective and objective results. Numéro de notice : A2011-117 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2011.01.006 En ligne : https://doi.org/10.1016/j.isprsjprs.2011.01.006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30897 [article]

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