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Synergetic use of optical and polSAR imagery for urban impervious surface estimation / Huadong Guo in Photogrammetric Engineering & Remote Sensing, PERS, vol 80 n° 1 (January 2014)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 80 n° 1 (January 2014) . - pp 91 - 102 Titre : Synergetic use of optical and polSAR imagery for urban impervious surface estimation Type de document : Article/Communication Auteurs : Huadong Guo, Auteur ; Huaining Yang, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 91 - 102 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] analyse comparative [Termes IGN] image optique [Termes IGN] image radar [Termes IGN] image SPOT 5 [Termes IGN] surface imperméable [Termes IGN] zone urbaine dense Résumé : (Auteur) Impervious surface estimation has been widely conducted with medium-high resolution optical imagery. Challenges however, remain in aspects of spectral similarity of different objects, mixed pixel, and shadows of tall buildings or large tree crowns. In order to reduce these uncertainties, this study explores the synergistic use of optical and radar remote sensing datasets in highly populated urban areas. A comparative analysis is performed between the RADARSAT-2 full POLSAR image and the SPOTS optical image. For both datasets, the C5.0 decision tree algorithm is applied to select features extracted to build a decision tree for urban impervious surface classification. It is found in this study that optical and POLSAR images possess different merits in delineating urban land surfaces. The POLSAR data is helpful for delineating bright impervious surfaces (e.g., buildings) and bare soils, which is often a difficult task for optical data. However, the confusion between dark impervious surfaces and bare soils becomes a severe problem due to similar surface scattering mechanisms. The intrinsic characteristics of radar scattering (e.g., layover and shadow effects) also result in high uncertainties in dense urban areas. These problems are leveraged when both optical and decomposed POLSAR features are considered. The results from this study indicate that the synergistic use of optical and POLSAR data could be an efficient approach to improving the estimation of urban impervious surfaces. Numéro de notice : A2014-094 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.80.1.91 En ligne : https://doi.org/10.14358/PERS.80.1.91 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32999 [article]