Centre de documentation
scientifique

Comparative analysis of urban reflectance and surface temperature / C. Small in Remote sensing of environment, vol 104 n° 2 (30 September 2006)  

Public [article]  inRemote sensing of environment > vol 104 n° 2 (30 September 2006) . - pp 168 - 189 Titre : Comparative analysis of urban reflectance and surface temperature Type de document : Article/Communication Auteurs : C. Small, Auteur Année de publication : 2006 Article en page(s) : pp 168 - 189 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse comparative [Termes IGN] analyse linéaire des mélanges spectraux [Termes IGN] données de terrain [Termes IGN] données hétérogènes [Termes IGN] image Landsat-ETM+ [Termes IGN] milieu urbain [Termes IGN] occupation du sol [Termes IGN] réalité de terrain [Termes IGN] réflectance urbaine [Termes IGN] température au sol [Termes IGN] variabilité Résumé : (Auteur) Urban environmental conditions are strongly dependent on the biophysical properties and radiant thermal field of the land cover elements in the urban mosaic. Observations of urban reflectance and surface temperature provide valuable constraints on the physical properties that are determinants of mass and energy fluxes in the urban environment. Consistencies in the covariation of surface temperature with reflectance properties can be parameterized to represent characteristics of the surface energy flux associated with different land covers and physical conditions. Linear mixture models can accurately represent Landsat ETM+ reflectances as fractions of generic spectral endmembers that correspond to land surface materials with distinct physical properties. Modeling heterogeneous land cover as mixtures of rock and/or soil Substrate, Vegetation and non-reflective Dark surface (SVD) generic endmembers makes it possible to quantify the dependence of aggregate surface temperature on the relative abundance of each physical component of the land cover, thereby distinguishing the effects of vegetation abundance, soil exposure, albedo and shadowing. Comparing these covariations in a wide variety of urban settings and physical environments provides a more robust indication of the global variability in these parameter spaces than could be inferred from a single study area. A comparative analysis of 24 urban areas and their non-urban peripheries illustrates the variability in the urban thermal fields and its dependence on biophysical land surface components. Contrary to expectation, moderate resolution intra-urban variations in surface temperature are generally as large as regional surface heat island signatures in these urban areas. Many of the non-temperate urban areas did not have surface heat island signatures at all. However, the multivariate distributions of surface temperature and generic endmember fractions reveal consistent patterns of thermal fraction covariation resulting from land cover characteristics. The Thermal-Vegetation (TV) fraction space illustrates the considerable variability in the well-known inverse correlation between surface temperature and vegetation fraction at moderate ( Numéro de notice : A2006-402 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2005.10.029 En ligne : https://doi.org/10.1016/j.rse.2005.10.029 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28126 [article]

A global analysis urban reflectance / C. Small in International Journal of Remote Sensing IJRS, vol 26 n° 4 (February 2005)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 26 n° 4 (February 2005) . - pp 661 - 681 Titre : A global analysis urban reflectance Type de document : Article/Communication Auteurs : C. Small, Auteur Année de publication : 2005 Article en page(s) : pp 661 - 681 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] albedo [Termes IGN] analyse des mélanges spectraux [Termes IGN] hétérogénéité sémantique [Termes IGN] image Landsat-ETM+ [Termes IGN] réflectance urbaine Numéro de notice : A2005-051 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160310001654950 En ligne : https://doi.org/10.1080/01431160310001654950 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27189 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-05041	RAB	Revue	Centre de documentation	En réserve L003	Exclu du prêt

High spatial resolution spectral mixture analysis of urban reflectance / C. Small in Remote sensing of environment, vol 88 n° 1 (30/11/2003)  

Public [article]  inRemote sensing of environment > vol 88 n° 1 (30/11/2003) . - pp 170 - 186 Titre : High spatial resolution spectral mixture analysis of urban reflectance Type de document : Article/Communication Auteurs : C. Small, Auteur Année de publication : 2003 Article en page(s) : pp 170 - 186 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] albedo [Termes IGN] analyse des mélanges spectraux [Termes IGN] image à résolution métrique [Termes IGN] image Ikonos [Termes IGN] milieu urbain [Termes IGN] radiance [Termes IGN] réflectance Résumé : (Auteur) This study uses IKONOS imagery to quantify the combined spatial and spectral charactenistics of urban reflectance in 14 urban areas worldwide. IKONOS 1-m panchromatic imagery provides a detailed measure of spatial variations in albedo while IKONOS 4-m multispectral imagery allows the relative contributions of different matenials to the spectrally heterogeneous radiance field to be determined and their abundance to be mapped. Spatial autocorrelation analyses indicate that the characteristic scale of urban reflectance is consistently between 10 and 20 m for the cities in this study. Spectral mixture analysis quantifies the relative contributions of the dominant spectral endmembers to the overall reflectance of the urban mosaic. Spectral mixing spaces defined by the two low-order principal components account for 96% to 990% of image variance and have a consistent triangular structure spanned by high albedo, low albedo and vegetation endmembers. Spectral mixing among these endmembers is predominantly linear although some nonlinear mixing is observed along the gray axis spanning the high and low albedo endmembers. Inversion of a constrained three-component linear mixing model produces stable, consistent estimates of endmember abundance. RMS errors based on the misfit between observed radiance vectors and modeled radiance vectors (derived from fraction estimates and image endmembers) are generally less than 3% of the mean of the observed radiance. Agreement between observed radiance and fraction estimates does not guarantee the accuracy of the areal fraction estimates, but it does indicate that the three-component linear model provides a consistent and widely applicable physical characterization of urban reflectance. Field validated fraction estimates have applications in urban vegetation monitoring and pervious surface mapping. Numéro de notice : A2003-334 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2003.04.008 En ligne : https://doi.org/10.1016/j.rse.2003.04.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22629 [article]