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Agriculture classification using PolSAR data / H. Skriver (2005)

Public Titre : Agriculture classification using PolSAR data Type de document : Article/Communication Auteurs : H. Skriver, Auteur ; J. Dall, Auteur ; Thuy Le Toan, Auteur ; et al., Auteur Editeur : Noordwijk : ESA Publications Année de publication : 2005 Collection : ESA Specialist Panel, ISSN 0379-6566 num. 586 Conférence : POLinSAR 2005 17/01/2005 21/01/2005 Frascati Italie Importance : 6 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] analyse discriminante [Termes IGN] céréales [Termes IGN] classification à base de connaissances [Termes IGN] classification dirigée [Termes IGN] cultures [Termes IGN] données polarimétriques [Termes IGN] image EMISAR [Termes IGN] image radar moirée [Termes IGN] polarimétrie radar [Termes IGN] polarisation Résumé : (Auteur) In this paper a classification scheme is presented, that uses a knowledge-based approach, where the crops are first classified into broad classes, i.e. bare surfaces, cereal crops, root crops, spring crops, winter crops etc. Hereafter, the discrimination between the individual crop types within these broad categories is performed. The discrimination into the broad classes is performed using standard polarimetric parameters such as the backscatter coefficients both at linear and circular polarisations, correlation coefficient and phase difference. The classification into the individual crop types is possible for some of the crop types, whereas it may for instance be very difficult to discriminate between some of the cereal crops. This part of the classification process is not as well established as the first part, and both a supervised approach and a knowledge-based approach may be used. Both POLSAR and PolInSAR data may be included in the classification scheme. The classification approach has been evaluated using data from the Danish EMISAR, and quantitative results based on in-situ information are presented. Numéro de notice : 13686 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64268

Change detection for thematic mapping by means of airborne multitemporal polarimetric SAR imagery / W. Dierking in IEEE Transactions on geoscience and remote sensing, vol 40 n° 3 (March 2002)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 40 n° 3 (March 2002) . - pp 618 - 636 Titre : Change detection for thematic mapping by means of airborne multitemporal polarimetric SAR imagery Type de document : Article/Communication Auteurs : W. Dierking, Auteur ; H. Skriver, Auteur Année de publication : 2002 Article en page(s) : pp 618 - 636 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique [Termes IGN] bande C [Termes IGN] bande L [Termes IGN] carte thématique [Termes IGN] chatoiement [Termes IGN] détection de changement [Termes IGN] image radar [Termes IGN] image radar moirée [Termes IGN] polarimétrie [Termes IGN] seuillage d'image Résumé : (Auteur) The paper addresses the detection of changes in multitemporal polarimetric radar images, focusing on small objects and narrow linear features. The images were acquired at C- and L-band by the airborne EMISAR system. It is found that the radar intensities are better suited for change detection than the correlation coefficient and the phase difference between the co-polarized channels. In the case of linear features, there is no obvious difference between C- and L-band, and slight variations of the flight tracks are acceptable at look angles larger than 35 degrees. Theoretical detection thresholds are evaluated from the statistical distribution of the intensity ratio due to speckle. For the linear features and for urban environments, the observed thresholds are larger than the theoretical predictions. This is interpreted as an effect of radar intensity variations on length scales smaller than the spatial image resolution. The signature of urban areas is very sensitive to deviations between the flight tracks, and the sensitivity is larger at C-band than at L-band. On the other hand, the intensity contrast between buildings and the urban background is smaller at L-band and larger at C-band. For change detection, thresholds may have to be chosen separately for each object class because the intensity ratios of different object classes vary differently as a function of time. Numéro de notice : A2002-176 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2002.1000322 En ligne : https://ieeexplore.ieee.org/document/1000322 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22091 [article]

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065-02031	RAB	Revue	Centre de documentation	En réserve L003	Disponible
065-02032	RAB	Revue	Centre de documentation	En réserve L003	Disponible