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Detecting and quantifying mountain permafrost creep from in situ inventory, space-borne radar interferometry and airborne digital photogrammetry / Tazio Strozzi in International Journal of Remote Sensing IJRS, vol 25 n° 15 (August 2004)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 25 n° 15 (August 2004) . - pp 2919 - 2931 Titre : Detecting and quantifying mountain permafrost creep from in situ inventory, space-borne radar interferometry and airborne digital photogrammetry Type de document : Article/Communication Auteurs : Tazio Strozzi, Auteur ; Andreas Kääb, Auteur Année de publication : 2004 Article en page(s) : pp 2919 - 2931 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image mixte [Termes IGN] analyse comparative [Termes IGN] données de terrain [Termes IGN] glacier [Termes IGN] image aérienne [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] mouvement de terrain [Termes IGN] pergélisol [Termes IGN] photo-interprétation Résumé : (Auteur) In this paper three different techniques for detecting and quantifying mountain permafrost creep are compared: (1) rock glacier inventory and characterization from in situ indicators, (2) space-borne radar interferometry, and (3) digital processing of repeated airborne imagery. The specific characteristics of the three methods and their complementarity are investigated for the Fletschhorn mountain range in the Simplon/Saas valley region, Swiss Alps. We found that radar interferometry is suitable to quantify the degree of activity and the order of surface velocity of rock glaciers over large areas in one process, with the possibility to also detect very small movements of inactive and relict rock glaciers. On the other hand, aero-photogrammetry represents a valuable base for additional interpretation of the three-dimensional surface flow field (including speed, direction and change in thickness) of the most active rock glaciers. Results from radar interferometry can also form the basis for further detailed in situ investigations. Numéro de notice : A2004-296 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/0143116042000192330 En ligne : https://doi.org/10.1080/0143116042000192330 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26823 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-04131	RAB	Revue	Centre de documentation	En réserve L003	Exclu du prêt

Derivation of a threshold function for the advanced very high resolution radiometer 3, 75um channel and its application in automatic cloud discrimination over snow/ice surfaces / X. Xiong in International Journal of Remote Sensing IJRS, vol 25 n° 15 (August 2004)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 25 n° 15 (August 2004) . - pp 2995 - 3017 Titre : Derivation of a threshold function for the advanced very high resolution radiometer 3, 75um channel and its application in automatic cloud discrimination over snow/ice surfaces Type de document : Article/Communication Auteurs : X. Xiong, Auteur ; R. Storvold, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 2995 - 3017 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] Alaska (Etats-Unis) [Termes IGN] albedo [Termes IGN] analyse discriminante [Termes IGN] Arctique, océan [Termes IGN] glace [Termes IGN] image NOAA-AVHRR [Termes IGN] luminance lumineuse [Termes IGN] nébulosité [Termes IGN] neige [Termes IGN] nuage [Termes IGN] rayonnement infrarouge moyen [Termes IGN] seuillage d'image Résumé : (Auteur) The distinct contrast between the reflectance of solar radiation in Advanced Very High Resolution Radiometer (AVHRR) channel 3 (3.75 um) by clouds and by bright surfaces provides an effective means of cloud discrimination over snow/ice surfaces. A threshold function for the top- of- atmosphere (TOA) albedo in channel 3 (r3) is derived and used to develop an improved method for cloud discrimination over snow/ice surfaces that makes explicit use of TOA r3. Corrections for radiance anisotropy and temperature effects are required to derive accurate values of r3 from satellite measurements and to utilize the threshold function. It has been used to retrieve cloud cover fractions from National Oceanic and Atmospheric Administration (NOAA)-14 AVHRR data over the Arctic Ocean and over the North Slope of Alaska (NSA) Atmospheric Radiation Measurement (ARM) site in Barrow, Alaska. The retrieved cloud fractions are in good agreement with SHEBA (Surface HEat Budget of the Arctic Ocean) surface visual observations and with NSA cloud radar and lidar observations, respectively. This method can be utilized to improve cloud discrimination over snow/ice surfaces for any satellite sensor with a channel near 3.7 um. Numéro de notice : A2004-297 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160310001619553 En ligne : https://doi.org/10.1080/01431160310001619553 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26824 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-04131	RAB	Revue	Centre de documentation	En réserve L003	Exclu du prêt