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Temporal stability of X-band single-pass InSAR heights in a spruce forest: effects of acquisition properties and season / Svein Solberg in IEEE Transactions on geoscience and remote sensing, vol 53 n° 3 (March 2015)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 53 n° 3 (March 2015) . - pp 1607 - 1614 Titre : Temporal stability of X-band single-pass InSAR heights in a spruce forest: effects of acquisition properties and season Type de document : Article/Communication Auteurs : Svein Solberg, Auteur ; Dan Johan Weydahl, Auteur ; Rasmus Astrup, Auteur Année de publication : 2015 Article en page(s) : pp 1607 - 1614 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] acquisition de données [Termes IGN] bande X [Termes IGN] biomasse [Termes IGN] données météorologiques [Termes IGN] forêt boréale [Termes IGN] image radar moirée [Termes IGN] image TanDEM-X [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] Norvège [Termes IGN] Picea abies [Termes IGN] stabilité dans le temps [Termes IGN] surveillance forestière Résumé : (Auteur) We investigated the stability of TanDEM-X interferometric synthetic aperture radar (InSAR) heights across eight repeated acquisitions. With InSAR height we mean the height above ground of the scattering phase center. We obtained InSAR heights by subtracting a digital terrain model generated from airborne laser scanning. The acquisitions varied in polarization, normal baseline, and season. The study area was a spruce forest in southeastern Norway. We established 179 field plots within 26 selected forest stands and obtained aboveground biomass (AGB) from field inventory. The InSAR heights were generally stable across the acquisitions as was the relationship between AGB and InSAR height, although systematic and random variations were noted. Two acquisitions had close-to-identical technical properties and weather conditions, and they produced close-to-identical InSAR heights. InSAR heights were fairly stable across a range in temperature and precipitation through spring, summer, and autumn, across a range in baseline values and for both HH and VV polarizations. However, a winter acquisition at temperatures of -7°C had much deeper penetration into the canopy and generated considerably lower InSAR heights and, hence, a very different relationship with biomass. Higher random errors were noted in a cross-pol data set due to lower backscatter and when the normal baseline was very small or very large. A height of ambiguity around 20-50 m appeared to be optimal. Interferometric X-band SAR can be used for monitoring coniferous boreal forests as long as the season and technical properties of the acquisition are kept within certain ranges. Numéro de notice : A2015-139 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2014.2346473 Date de publication en ligne : 28/08/2014 En ligne : https://doi.org/10.1109/TGRS.2014.2346473 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75806 [article]

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065-2015031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Geolocation and stereo height estimation using TerraSAR-X spotlight image data / K. Eldhuset in IEEE Transactions on geoscience and remote sensing, vol 49 n° 10 Tome 1 (October 2011)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 49 n° 10 Tome 1 (October 2011) . - pp 3574 - 3581 Titre : Geolocation and stereo height estimation using TerraSAR-X spotlight image data Type de document : Article/Communication Auteurs : K. Eldhuset, Auteur ; Dan Johan Weydahl, Auteur Année de publication : 2011 Article en page(s) : pp 3574 - 3581 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] coin réflecteur [Termes IGN] géoréférencement direct [Termes IGN] hauteur du bâti [Termes IGN] image TerraSAR-X [Termes IGN] précision du positionnement [Termes IGN] tâche claire Résumé : (Auteur) We have studied the geographic position of several high-resolution spotlight TSX images by investigating the location of deployed radar corner reflectors. Results show that the geolocation accuracy is better than the resolution cell in both azimuth and range directions. The same corner reflectors as well as distinct points on buildings are used to estimate the absolute height from stereo viewing spotlight TSX images to within a few decimeters accuracy. Numéro de notice : A2011-426 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2011.2160951 Date de publication en ligne : 29/07/2011 En ligne : https://doi.org/10.1109/TGRS.2011.2160951 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31205 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
065-201110A1	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Comparing RADARSAT-1 and IKONOS satellite images for urban features detection / Dan Johan Weydahl (2003)  

Public Titre : Comparing RADARSAT-1 and IKONOS satellite images for urban features detection Type de document : Article/Communication Auteurs : Dan Johan Weydahl, Auteur ; Frédéric Bretar, Auteur ; P. Bjerke, Auteur Editeur : New York : Institute of Electrical and Electronics Engineers IEEE Année de publication : 2003 Conférence : URBAN 2003, 2nd GRSS/ISPRS Joint Workshop on Remote Sensing and Data Fusion over Urban Areas 22/05/2003 23/05/2003 Berlin Allemagne Proceedings IEEE Note générale : bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] analyse comparative [Termes IGN] détection automatique [Termes IGN] image Ikonos [Termes IGN] image Radarsat [Termes IGN] image satellite [Termes IGN] milieu urbain Résumé : (auteur) In this paper, a comparison of the visual appearance and detection of different man-made objects in an urban area in Norway is presented using IKONOS and RADARSAT-1 images. Results show that RADARSAT-1 fine mode images add very limited information to the IKONOS panchromatic image for many mapping applications. One explanation for the seemingly lack of information from the synthetic aperture radar (SAR) data, is that the IKONOS sensor image the Earth ground with a resolution of 1 m, while the RADARSAT-1 fine mode only has 9 m resolution. Despite these matters, it is shown that RADARSAT-1 may uniquely detect certain objects or structures and thereby give additional knowledge to the interpretation of an IKONOS image. Multi-temporal RADARSAT-1 acquisitions can also be used to detect man-made changes at times when weather conditions hamper optical image acquisitions. It is expected that new SAR satellites with resolutions down towards 1 m, work much better as a complementary, all-weather information source to the optical ones. Numéro de notice : C2003-047 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1109/DFUA.2003.1220009 Date de publication en ligne : 24/10/2011 En ligne : https://doi.org/10.1109/DFUA.2003.1220009 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101140