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Sub-canopy soil moisture modeling in n-dimensional spectral feature space / A. Ghulam in Photogrammetric Engineering & Remote Sensing, PERS, vol 77 n° 2 (February 2011)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 77 n° 2 (February 2011) . - pp 149 - 156 Titre : Sub-canopy soil moisture modeling in n-dimensional spectral feature space Type de document : Article/Communication Auteurs : A. Ghulam, Auteur ; T. Kusky, Auteur ; T. Teyip, Auteur ; Q. Qin, Auteur Année de publication : 2011 Article en page(s) : pp 149 - 156 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] humidité du sol [Termes IGN] image aérienne [Termes IGN] image Terra-MODIS [Termes IGN] modélisation [Termes IGN] signature spectrale [Termes IGN] sous-bois Résumé : (Auteur) This paper attempts to quantify soil moisture in various canopy cover conditions using n-dimensional spectral signatures, including land surface temperature, vegetation index, albedo, and others. First, the feature vector between the pixels and various moisture contents was indentified. Normalization of the varying distance from a user-defined initial state to any pixel location, and coefficients related with n-dimensional spectral feature space were calculated, assigning weights to each parameter. Then, a soil moisture index was developed using a linear combination of the first order polynomials. The Extended Fourier Amplitude Sensitivity Test (eFAST) was used to calculate the relative variance contribution of model input parameters to the variance of soil moisture predictions. Results derived from satellite data including Enhanced Thematic Mapper Plus (ETM+) and the Moderate Resolution Imaging Spectroradiometer (MODIS) imagery demonstrated significant correlations between the index and soil moisture obtained for different ecosystems and vegetation cover. The best agreement, the coefficient of determination (R2), between the index and soil moisture were 0.58 and 0.65 for ETM+ and MODIS data, respectively. eFAST sensitivity analysis indicates that land surface temperature might be the most determinant factor in soil moisture estimation, then albedo, followed by NDVI. Numéro de notice : A2011-046 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.14358/PERS.77.2.149 En ligne : https://doi.org/10.14358/PERS.77.2.149 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30827 [article]

Efficiently computing and deriving topological relation matrices between complex regions with broad boundaries / S. Du in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 6 (November - December 2008)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 63 n° 6 (November - December 2008) . - pp 593 - 609 Titre : Efficiently computing and deriving topological relation matrices between complex regions with broad boundaries Type de document : Article/Communication Auteurs : S. Du, Auteur ; Luo Guo, Auteur ; Q. Wang, Auteur ; Q. Qin, Auteur Année de publication : 2008 Article en page(s) : pp 593 - 609 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] base de données localisées [Termes IGN] limite indéterminée [Termes IGN] matrice [Termes IGN] objet géographique complexe [Termes IGN] relation topologique [Termes IGN] représentation par frontière surfacique [Termes IGN] structure hiérarchique de données [Termes IGN] système d'information géographique Résumé : (Auteur) The extended 9-intersection matrix is used to formalize topological relations between uncertain regions while it is designed to satisfy the requirements at a concept level, and to deal with the complex regions with broad boundaries (CBBRs) as a whole without considering their hierarchical structures. In contrast to simple regions with broad boundaries, CBBRs have complex hierarchical structures. Therefore, it is necessary to take into account the complex hierarchical structure and to represent the topological relations between all regions in CBBRs as a relation matrix, rather than using the extended 9-intersection matrix to determine topological relations. In this study, a tree model is first used to represent the intrinsic configuration of CBBRs hierarchically. Then, the reasoning tables are presented for deriving topological relations between child, parent and sibling regions from the relations between two given regions in CBBRs. Finally, based on the reasoning, efficient methods are proposed to compute and derive the topological relation matrix. The proposed methods can be incorporated into spatial databases to facilitate geometric-oriented applications. Copyright ISPRS Numéro de notice : A2008-433 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2008.02.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2008.02.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29502 [article]

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