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Portail d'information géographique

Résultats de la recherche (19 résultats)

An explanation of enhanced radar backscattering from flooded forests

An explanation of enhanced radar backscattering from flooded forests
The change in Fresnel power reflexion coefficient of the ground with flooding is advanced as the cause of the enhancement in backscattered power levels.-(CB)

Theoretical study of the sensitivity of the microwave backscattering coefficient to the soil surface parameters

Theoretical study of the sensitivity of the microwave backscattering coefficient to the soil surface parameters

Measurement of backscatter from conifers in the C and X bands in International symposium on Microwave Signatures in Remote Sensing.

Measurement of backscatter from conifers in the C and X bands in International symposium on Microwave Signatures in Remote Sensing.

On the contribution of volume scattering to the microwave backscattered signal from wet snow and wet soil

On the contribution of volume scattering to the microwave backscattered signal from wet snow and wet soil

Modelling of radar backscattering from low-salinity ice with ice ridges in International symposium on Microwave Signatures in Remote Sensing.

Modelling of radar backscattering from low-salinity ice with ice ridges in International symposium on Microwave Signatures in Remote Sensing.

Radar backscattering of forest stands in Symposium on microwave signatures in remote-sensing. Toulouse, 16-20 janvier 1984.

Radar backscattering of forest stands in Symposium on microwave signatures in remote-sensing. Toulouse, 16-20 janvier 1984.

Chemical weathering associated with tafoni at Papago Park, central Arizona

Papago Park is a pediment-inselberg complex that hosts a variety of well developed tafoni and alveolar weathering forms. The aim of this paper is to analyse the nature of chemical weathering associated with the tafoni using backscatter electron

Factors that interfere with the age determination of rock varnish

Discussion of the potential of rock varnish as a Quaternary dating technique for geomorphical and archaeological studies. New backscattered electron microscopy imagery of varnishes from southwestern North America illustrates the need for great

Importance of environment on the order of mineral weathering in olivine basalts, Hawaii

Examination of weathering rinds from lava flows on Hawaii with backscatter electron microscopy and electron microprobe analysis reveals that olivine weathers more slowly than adjacent clinopyroxene and plagioclase in environments with a paucity

Suspended particulate matter (SPM) in the North Sea-Baltic Sea transition : distributions, inventories, and the autumn 2002 inflows

This study describes the spatial distribution of suspended particulate matter (SPM) in the North Sea-Baltic Sea transition in autumn 2002 based on cruises in August, September, and October. The cruises comprised CTD and optical backscatter

An inexpensive turbidimeter for monitoring suspended sediment

This paper details the design and performance of such a turbidimeter (the HOBS Harry's Optical Backscatter Sensor) developed for spatially distributed monitoring of suspended sediment in proglacial streams. The effectiveness of the HOBS

Season- and depth-dependent time stability for characterising representative monitoring locations of soil water storage in a hummocky landscape

, and to recommend efficient ways to identify these locations. Soil water was measured down to vertical depth intervals using time domain reflectometry and neutron backscattering along a hummocky transect in semiarid central Canada. It is shown that similarities

Influence of varying tidal prism on hydrodynamics and sedimentary processes in a hypertidal salt marsh creek

This research considers acoustic Doppler velocimeter (ADV) and optical backscatter sensor (OBS) data from a sheltered tidal creek in the Minas Basin, for analysis of tidal characteristics in a hypertidal creek environment over spring and neap tidal

Remote sensing and geophysical investigations in French Guiana

.). In the particular case of the preserved rain forest of French Guiana, the SAR backscattering is mainly due to the shape of the homogeneous canopy modulated by regional morphology.

Lidarnye nabludeniâ za soderžaniem vulkaničeskogo aèrozolâ v atmosfere nad Tomskom

Aerosol ; Air mass ; Aleutian Islands ; Asian part of Russia ; Atmosphere ; Backscattering ; LiDAR ; Pollution ; Remote sensing ; Sulphur dioxide ; Tomsk ; Volcanic ash ; Wind speed

Reflectance anisotropy for measuring soil surface roughness of multiple soil types

; AM) was determined, using a ratio between extreme forward-scattered and backscattered HCRFs. Regression analysis of AM against a geostatistically-derived value of soil surface roughness (sill variance) was used to test the ability of the AM

Apport de l'imagerie RSO en milieu aride: Cas de la région de Nouakchott en Mauritanie

Africa ; Atlantic Ocean ; Mauritania ; Space remote sensing ; Spot ; West Africa ; altitude ; arid environment ; backscattering ; coastal dunes ; field studies ; high resolution ; humidity ; imagery ; landform evolution ; longshore bars ; modern

Estimation des paramètres de surface en micro-onde active : intercomparaison avec les données de terrain

Africa ; Niger ; Space remote sensing ; West Africa ; backscattering ; digital simulation ; magnitude ; microwave methods ; models ; roughness ; signals ; soil moisture ; soils ; spatial variations ; terrains ; time variations

Apport des données RSO de RADARSAT-1 à l'étude de l'humidité des sols d'une zone semi-aride : implication pour la modélisation hydrologique

Africa ; Morocco ; North Africa ; Space remote sensing ; Thematic Mapper ; algorithms ; backscattering ; basin management ; cartography ; drainage ; drainage basins ; interpretation ; land cover maps ; landcover ; microwaves ; models ; semi-arid