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Integrated use of SRM, Landsat ETM+ data and 3D perspective views to identify the tectonic geomorphology of Dehradun valley, India / A.K. Singh in International Journal of Remote Sensing IJRS, vol 28 n°11-12 (June 2007)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 28 n°11-12 (June 2007) . - pp 2403 - 2414 Titre : Integrated use of SRM, Landsat ETM+ data and 3D perspective views to identify the tectonic geomorphology of Dehradun valley, India Type de document : Article/Communication Auteurs : A.K. Singh, Auteur ; B. Parkash, Auteur ; P.R. Choudhury, Auteur Année de publication : 2007 Article en page(s) : pp 2403 - 2414 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] carte géomorphologique [Termes IGN] géomorphologie locale [Termes IGN] image Landsat-ETM+ [Termes IGN] Inde [Termes IGN] modèle numérique de terrain [Termes IGN] ombre [Termes IGN] perspective [Termes IGN] tectonique [Termes IGN] vallée [Termes IGN] visualisation 3D Résumé : (Auteur) The present study aims to develop an integrated shaded relief model (SRM), remote sensing image and three-dimensional (3D) perspective view based approach for delineating tectonic geomorphology of the Dehradun Intermontane valley, India. SRM created from digital elevation model (DEM) actually represents the information of the bare ground surface without any surface cover such as vegetation and landuse. Under user-specified positions of the sun, this was useful in enhancing the lineaments. This, coupled with Landsat ETM+ data and 3D perspective views has proven to be a very good tool for the identification of geological features. In a hilly terrain, like the present area, having dense forest cover, many places are inaccessible and geological field mapping is quite difficult. This approach successfully identified tectonic geomorphological features like faults, alluvial fans and terraces in the present area. Comparison of the identified faults and geomorphic features with published work and field checks reveals that this method of mapping can reduce the time and effort required in fieldwork to a large extent. Numéro de notice : A2007-308 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160600993397 En ligne : https://doi.org/10.1080/01431160600993397 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28671 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-07071	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Urban radiation balance of two coastal cities in a hot and dry environment / C.M. Frey in International Journal of Remote Sensing IJRS, vol 28 n°11-12 (June 2007)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 28 n°11-12 (June 2007) . - pp 2695 - 2712 Titre : Urban radiation balance of two coastal cities in a hot and dry environment Type de document : Article/Communication Auteurs : C.M. Frey, Auteur ; G. Rigo, Auteur ; E. Parlow, Auteur Année de publication : 2007 Article en page(s) : pp 2695 - 2712 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] Abou Dabi [Termes IGN] albedo [Termes IGN] analyse comparative [Termes IGN] bande infrarouge [Termes IGN] bilan radiatif [Termes IGN] Doubaï [Termes IGN] image Terra-ASTER [Termes IGN] littoral [Termes IGN] rayonnement infrarouge [Termes IGN] température de surface [Termes IGN] ville Résumé : (Auteur) Four Advanced Spaceborne Thermal Emission and Reflection radiometer (ASTER) satellite scenes of Dubai and Abu Dhabi with channels from the visible-near infrared (VNIR) to the thermal infrared (TIR) were analysed to show variations in surface temperature, albedo, emissivity and net radiation in different urban and rural classes. For a better understanding of the spatial coherences of surface properties a land use classification was derived. The different classes were then spatially and temporally compared. The investigations show in the daytime a distinct surface cool island for Dubai and surface cool areas at Abu Dhabi city and its surrounding mangrove areas. Net radiation is mainly controlled by the albedo. The albedo in urban areas is lower than in their surrounding desert environments, therefore the net radiation is higher in the urban areas. The surface temperatures behave contrary to the net radiation and are higher in land use classes, where water is available. Copyright Taylor & Francis Numéro de notice : A2007-309 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160600993389 En ligne : https://doi.org/10.1080/01431160600993389 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28672 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-07071	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Mapping of salt-affected soils using TM images / P. Garcia Rodriguez in International Journal of Remote Sensing IJRS, vol 28 n°11-12 (June 2007)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 28 n°11-12 (June 2007) . - pp 2713 - 2722 Titre : Mapping of salt-affected soils using TM images Type de document : Article/Communication Auteurs : P. Garcia Rodriguez, Auteur ; M.E. Perrez Gonzales, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 2713 - 2722 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] Castille-La Manche [Termes IGN] classification dirigée [Termes IGN] déformation de surface [Termes IGN] eau souterraine [Termes IGN] image Landsat-TM [Termes IGN] inondation [Termes IGN] Normalized Difference Vegetation Index [Termes IGN] risque naturel [Termes IGN] sédiment [Termes IGN] sol salin Résumé : (Auteur) Landsat images supply significant information on the different aspects of the physical environment necessary to determine the distribution of salty soils. This work centres on the La Mancha area (Central Spain) which, due to its flat topography, exhibits ideal conditions to show surface and groundwater movement, as well as sediment distribution. Combination of these factors is essential for development. The main goal of this study is to derive information on the distribution of salt-affected soils, as well as the area subject to flood risk. Multitemporal Landsat TM images selected from the 1990s have been used for this purpose. TM images are useful for delineation of mesozoic sediments rich in salts and/or areas with high humidity content. These images have been geo-referenced to the UTM coordinate system and have been digitally enhanced. Principal components, NDVI and supervised classification were computed. Therefore, it is quite possible to predict with a high degree of probability the development of saline soils, but their precise classification is not always possible, owing to the fact that they are usually associated with other soil groups: calcisols, regosols, luvisols and kastanozems. Salt-affected soils have been found to be associated with clayish mesozoic sediments, hollows, flood plain area and subsurface and groundwater movements. Complementary fieldwork is necessary in order to confirm digital values. Copyright Taylor & Francis Numéro de notice : A2007-310 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160600928658 En ligne : https://doi.org/10.1080/01431160600928658 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28673 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-07071	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Wavelet decomposition of hyperspectral data: a novel approach to quantifying pigment concentrations in vegetation / G. Blackburn in International Journal of Remote Sensing IJRS, vol 28 n°11-12 (June 2007)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 28 n°11-12 (June 2007) . - pp 2831 - 2855 Titre : Wavelet decomposition of hyperspectral data: a novel approach to quantifying pigment concentrations in vegetation Type de document : Article/Communication Auteurs : G. Blackburn, Auteur Année de publication : 2007 Article en page(s) : pp 2831 - 2855 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] chlorophylle [Termes IGN] coefficient de rétrodiffusion [Termes IGN] image hyperspectrale [Termes IGN] modèle de simulation [Termes IGN] réflectance [Termes IGN] réflectance végétale [Termes IGN] transformation en ondelettes Résumé : (Auteur) This paper reports a new approach for quantifying vegetation pigment concentrations through wavelet decomposition of hyperspectral remotely sensed data. Wavelets are a group of functions that vary in complexity and mathematical properties, that are used to dissect data into different frequency components and then characterize each component with a resolution appropriate to its scale. Wavelet analysis of a reflectance spectrum is performed by scaling and shifting the wavelet function to produce wavelet coefficients that are assigned to different frequency components. By selecting appropriate wavelet coefficients, a spectral model can be established between the coefficients and biochemical concentrations. Hence, wavelet analysis has the potential to capture much more of the information contained within high-resolution spectra than previous approaches and offers the prospect of developing robust, generic methods for pigment determinations. The capabilities of the wavelet-based technique were examined using reflectance spectra and pigment data collected for a range of plant species at leaf and canopy scales. For the combined data set and all of the individual vegetation types, methods based on wavelet decomposition appreciably outperformed narrowband spectral indices and stepwise selection of narrowband reflectance. However, there was variation between vegetation types in the relative performance of the three different feature extraction techniques employed for selecting the wavelet coefficients for use in predictive models. There was also considerable variability in the performance of predictive models according to the wavelet function used for spectral decomposition and the optimum wavelet functions differed between vegetation types and between individual pigments within the same vegetation type. The research indicates that wavelet analysis holds promise for the accurate determination of chlorophyll a and b and the carotenoids, but further work is needed to refine the approach. Copyright Taylor & Francis Numéro de notice : A2007-311 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160600928625 En ligne : https://doi.org/10.1080/01431160600928625 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28674 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-07071	RAB	Revue	Centre de documentation	En réserve L003	Disponible