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Automatic co-registration of satellite time series / M. Gianinetto in Photogrammetric record, vol 27 n° 140 (December 2012 - February 2013)  

Public [article]  inPhotogrammetric record > vol 27 n° 140 (December 2012 - February 2013) . - pp 462 - 470 Titre : Automatic co-registration of satellite time series Type de document : Article/Communication Auteurs : M. Gianinetto, Auteur Année de publication : 2012 Article en page(s) : pp 462 - 470 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] extraction automatique [Termes IGN] image Terra-ASTER [Termes IGN] point d'appui [Termes IGN] série temporelle [Termes IGN] superposition d'images Résumé : (Auteur) In modern remote sensing applications the use of automatic image processing codes is becoming increasingly common. When dealing with satellite time series or multi-source data, image co-registration is a time-consuming, but necessary, pre-processing step. This study shows how a medium resolution satellite multitemporal dataset can be effectively processed using automatic data processing. Results on real and transformed ASTER data showed that, without human interaction, the automatic ground control points extraction (AGE) technique, developed at Politecnico di Milano, is able to obtain accuracies generally sufficient for practical applications and similar to those reported in other studies. Numéro de notice : A2012-093 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2012.00689.x Date de publication en ligne : 09/08/2012 En ligne : https://doi.org/10.1111/j.1477-9730.2012.00689.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31541 [article]

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Land use classification from lidar data and ortho-images in a rural area / Sandra Bujan in Photogrammetric record, vol 27 n° 140 (December 2012 - February 2013)  

Public [article]  inPhotogrammetric record > vol 27 n° 140 (December 2012 - February 2013) . - pp 401 - 422 Titre : Land use classification from lidar data and ortho-images in a rural area Type de document : Article/Communication Auteurs : Sandra Bujan, Auteur ; Edouardo M. González‐Ferreiro, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 401 - 422 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] analyse comparative [Termes IGN] classification orientée objet [Termes IGN] détection du bâti [Termes IGN] données lidar [Termes IGN] image aérienne [Termes IGN] occupation du sol [Termes IGN] paysage rural [Termes IGN] précision des données [Termes IGN] superposition de données Résumé : (Auteur) Obtaining information on the distribution of rural landscape types is an active research topic within Spanish rural studies. This paper presents a new hierarchical object-based classification method for the automatic detection of various land use classes in a rural area, combining lidar data and aerial images. In view of the upcoming availability of low-density lidar data (0·5 pulses/m2) for most of the territory of Spain, this paper assesses the feasibility and accuracy of the proposed method for various lidar data densities. Such an assessment was conducted using two approaches: firstly, based on the final classification, which produced an overall accuracy over 96% and a kappa index above 0·95 for the combinations of the aerial image and lidar data-sets with four different densities; and secondly, based solely on the areas classified as buildings. In the second approach, the accuracy of the classification for building detection at pixel and object level was assessed. The object-oriented classification of buildings produced an index of correctness of over 99% and an index of completeness of about 95%. The results reveal a high agreement between classification and ground truth data. Numéro de notice : A2012-624 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2012.00698.x Date de publication en ligne : 18/12/2012 En ligne : https://doi.org/10.1111/j.1477-9730.2012.00698.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32070 [article]

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Image matching of satellite data based on quadrilateral control networks / A. Sedaghat in Photogrammetric record, vol 27 n° 140 (December 2012 - February 2013)  

Public [article]  inPhotogrammetric record > vol 27 n° 140 (December 2012 - February 2013) . - pp 423 - 442 Titre : Image matching of satellite data based on quadrilateral control networks Type de document : Article/Communication Auteurs : A. Sedaghat, Auteur ; H. Ebadi, Auteur ; M. Mokhtazarde, Auteur Année de publication : 2012 Article en page(s) : pp 423 - 442 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] appariement d'images [Termes IGN] coin réflecteur [Termes IGN] détection de coins Harris [Termes IGN] point d'appui [Termes IGN] réseau de contrôle [Termes IGN] SIFT (algorithme) Résumé : (Auteur) Automatic image matching of satellite data is a difficult process due to the complex characteristics of such image pairs, including significant translation, rotation, scaling and illumination differences. A new method is proposed where, initially, a pre-registration is performed to coarsely align the input and reference images. Next, a dense set of corner points are extracted using the Harris operator. The strongest conjugate corner points are determined and the accuracy is improved by using least squares matching to construct a precise braced quadrilateral control network in the two images. Once the consistency of the established network pairs has been determined, it is used as a framework to match the remaining corner points. Comprehensive evaluations of the proposed method on a variety of image pairs from different sensors prove its efficiency with sub-pixel positional accuracy. Numéro de notice : A2012-625 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2012.00699.x Date de publication en ligne : 11/10/2012 En ligne : https://doi.org/10.1111/j.1477-9730.2012.00699.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32071 [article]

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Direct exterior orientation determination for a low-cost heritage recording system / M. Kirschhöfer in Photogrammetric record, vol 27 n° 140 (December 2012 - February 2013)  

Public [article]  inPhotogrammetric record > vol 27 n° 140 (December 2012 - February 2013) . - pp 443 - 461 Titre : Direct exterior orientation determination for a low-cost heritage recording system Type de document : Article/Communication Auteurs : M. Kirschhöfer, Auteur ; Jim H. Chandler, Auteur ; R. Wackrow, Auteur Année de publication : 2012 Article en page(s) : pp 443 - 461 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie terrestre [Termes IGN] antenne GNSS [Termes IGN] caméra numérique [Termes IGN] données localisées des bénévoles [Termes IGN] orientation externe [Termes IGN] patrimoine culturel [Termes IGN] patrimoine immobilier [Termes IGN] photogrammétrie terrestre Résumé : (Auteur) Close range photogrammetry has proved effective as a cost-effective and easy-to-use method for cultural heritage recording. Off-the-shelf digital cameras can be used to rapidly acquire data at low cost, allowing non-experts to become more involved in their local heritage, an important aspiration identified in this collaboration between English Heritage and Loughborough University. To achieve this while also allowing for measurements in a 3D national reference system, a recording system has been developed that is capable of deriving the exterior orientation during exposure directly and cheaply. The system comprises a digital camera, a small 3D orientation sensor and a GNSS antenna, assembled in a frame that allows calibration of the offsets between the components. Test field data was used to investigate calibration precision and stability as well as achievable absolute and relative accuracy. The results of data analysis indicate that the system can meet the accuracy requirements for medium accuracy heritage recording, even with slightly unstable offset calibration values. Numéro de notice : A2012-626 Affiliation des auteurs : non IGN Thématique : IMAGERIE/SOCIETE NUMERIQUE Nature : Article DOI : 10.1111/j.1477-9730.2012.00701.x Date de publication en ligne : 18/12/2012 En ligne : https://doi.org/10.1111/j.1477-9730.2012.00701.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32072 [article]

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