Search results for "Satellite observation"

showing 3 items of 3 documents

Assessment of the SMAP Level-4 Surface and Root-Zone Soil Moisture Product Using In Situ Measurements

2017

International audience; The Soil Moisture Active Passive (SMAP) mission Level-4 Surface and Root-Zone Soil Moisture (L4_SM) data product is generated by assimilating SMAP L-band brightness temperature observations into the NASA Catchment land surface model. The L4_SM product is available from 31 March 2015 to present (within 3 days from real time) and provides 3-hourly, global, 9-km resolution estimates of surface (0-5 cm) and root-zone (0-100 cm) soil moisture and land surface conditions. This study presents an overview of the L4_SM algorithm, validation approach, and product assessment versus in situ measurements. Core validation sites provide spatially averaged surface (root zone) soil m…

Atmospheric Science010504 meteorology & atmospheric sciences0208 environmental biotechnologyDrainage basin[SDU.STU]Sciences of the Universe [physics]/Earth SciencesSoil science02 engineering and technologyLand cover01 natural sciencesStandard deviationITC-HYBRIDData assimilationSoil temperatureWater content0105 earth and related environmental sciencesgeographygeography.geographical_feature_category020801 environmental engineeringSatellite observations[SDU]Sciences of the Universe [physics]Brightness temperatureITC-ISI-JOURNAL-ARTICLEData assimilationDNS root zoneEnvironmental scienceSoil moistureLand surface modelScale (map)Kalman filtersJournal of hydrometeorology
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On the identification of celestial γ-ray sources

1978

THE observations from COS B have provided a new and more detailed picture of the high energy γ-ray emission from the Galaxy. We discuss here the first catalogue with 13 localised sources which has been compiled1,2 and how the list should lengthen in the near future, as the data analysis progresses.

PhysicsIdentification (information)High energySatellite observationMultidisciplinaryGamma ray spectrometerAstronomyQuasarAstrophysicsGamma-ray astronomyAstronomical spectroscopyGalaxyNature
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Quel prix les habitants d'une région périurbaine payent-ils pour voir des paysages "verts" depuis chez eux ?

2009

National audience; L'objectif de cet article est d'estimer le prix d'attributs paysagers dans la région de Dijon. À partir d'images satellites et d'un modèle numérique de terrain, une méthode de géographie quantitative développée à partir de systèmes d'information géographique (SIG) permet de " mesurer " les paysages vus depuis le sol à travers une batterie d'indices. Sur la base de 2 667 transactions immobilières, un modèle économétrique utilisant la méthode des prix hédonistes permet d'estimer les prix des attributs paysagers ainsi quantifiés. Les résultats montrent, tout d'abord, que dans cette région les ménages sont " myopes ": le prix de paysages vus au-delà d'une ou deux centaines de…

Satellite observation[SHS.GEO] Humanities and Social Sciences/Geography0211 other engineering and technologies021107 urban & regional planningLandscape conservation02 engineering and technology[SHS.GEO]Humanities and Social Sciences/Geography010501 environmental sciencesManagement Monitoring Policy and Law01 natural sciences[ SHS.GEO ] Humanities and Social Sciences/GeographyAesthetic valueEconomic analysisAnimal Science and ZoologyAgronomy and Crop ScienceHumanities0105 earth and related environmental sciences
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