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Bright-band detection from radar vertical reflectivity profiles / M.A. Rico-Ramirez in International Journal of Remote Sensing IJRS, vol 28 n°17-18 (September 2007)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 28 n°17-18 (September 2007) . - pp 4013 - 4025 Titre : Bright-band detection from radar vertical reflectivity profiles Type de document : Article/Communication Auteurs : M.A. Rico-Ramirez, Auteur ; I.D. Cluckie, Auteur Année de publication : 2007 Article en page(s) : pp 4013 - 4025 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] bande spectrale [Termes IGN] estimation statistique [Termes IGN] hydrologie [Termes IGN] image radar [Termes IGN] luminance lumineuse [Termes IGN] précipitation [Termes IGN] réflectance directionnelle [Termes IGN] réflectivité Résumé : (Auteur) The use of quantitative scanning weather radar for precipitation measurements is a vital element of modern hydrology and limits the development of all distributed models of catchment behaviour. The presence of the so-called bright band (or melting layer) contaminates the quantitative precipitation estimates and has delayed the widespread take-up of radar-based precipitation estimates in operational models. The study of the Vertical Reflectivity Profile (VRP) of precipitation is important in order to develop algorithms to correct scanning weather radar measurements for the variation of the VRP at long ranges. Therefore, this paper presents an algorithm to detect the extent of the bright band using high-resolution VRP's. The boundaries of the bright band are identified by a new algorithm which utilizes a rotational coordinate system for identifying the upper and lower parts of the bright band. This overcomes some of the difficulties experienced when using the gradient of the reflectivity in conventional bright-band detection algorithms. The reflectivities above, within, and below the bright band are then used to construct idealized VRP's to correct scanning weather radar measurements. Copyright Taylor & Francis Numéro de notice : A2007-405 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160601047797 En ligne : https://doi.org/10.1080/01431160601047797 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28768 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-07101	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Detection and substitution of clouds/hazes and their cast shadows on Ikonos images / Dong Lu in International Journal of Remote Sensing IJRS, vol 28 n°17-18 (September 2007)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 28 n°17-18 (September 2007) . - pp 4027 - 4035 Titre : Detection and substitution of clouds/hazes and their cast shadows on Ikonos images Type de document : Article/Communication Auteurs : Dong Lu, Auteur Année de publication : 2007 Article en page(s) : pp 4027 - 4035 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] détection d'ombre [Termes IGN] image à résolution métrique [Termes IGN] image Ikonos [Termes IGN] nuage [Termes IGN] pixel [Termes IGN] texture d'image Résumé : (Auteur) Frequently cloudy conditions in moist tropical regions often cause difficulty in acquiring good-quality remote-sensing images. This paper explores approaches to detect clouds/hazes and their cast shadows on IKONOS images. Two approaches based on maximum and minimum filters and the second-moment texture measures were tested. The detected clouds/hazes and their cast shadows in one image were then replaced with the pixel values from the same location of another image after image normalization. This research indicates that both the approaches developed in this paper have successfully detected the clouds/hazes and their cast shadows on IKONOS images. In particular, the second-moment texture approach is recommended. Copyright Taylor & Francis Numéro de notice : A2007-406 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160701227703 En ligne : https://doi.org/10.1080/01431160701227703 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28769 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-07101	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Multispectral images fusion by a joint multidirectional and multiresolution representation / M. Lillo-Saaverda in International Journal of Remote Sensing IJRS, vol 28 n°17-18 (September 2007)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 28 n°17-18 (September 2007) . - pp 4065 - 4079 Titre : Multispectral images fusion by a joint multidirectional and multiresolution representation Type de document : Article/Communication Auteurs : M. Lillo-Saaverda, Auteur ; C. Gonzalo, Auteur Année de publication : 2007 Article en page(s) : pp 4065 - 4079 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] filtre passe-bas [Termes IGN] fusion d'images [Termes IGN] image Ikonos [Termes IGN] image multibande [Termes IGN] résolution multiple Résumé : (Auteur) This paper proposes a new fusion method that permits an adequate selection of information extracted from source images to obtain fused images with good spatial and spectral quality simultaneously. This method is based on a joint multiresolution multidirectional representation of the source images using a single directional spatial frequency low pass filter bank of low computational complexity, defined in the Fourier domain. The source images correspond to those captured by the IKONOS satellite (panchromatic and multispectral). The results obtained indicate that the proposed method provides, in a simple manner, objective control over the trade-off between high spatial and spectral quality of the fused images. Copyright Taylor & Francis Numéro de notice : A2007-407 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160601105884 En ligne : https://doi.org/10.1080/01431160601105884 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28770 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-07101	RAB	Revue	Centre de documentation	En réserve L003	Disponible