Proceedings of the Symposium on Global and Environmental Monitoring: Proceedings of the Symposium on Global and Environmental Monitoring

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Persistent identifier:: 856665355

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts ; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856665355

Language:: English

Document type:: Multivolume work

Volume

Persistent identifier:: 856669164

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Scope:: XIV, 912 Seiten

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856669164

Illustration:: Illustrationen, Diagramme, Karten

Signature of the source:: ZS 312(28,7,1)

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [TP-4 SOILS]

Document type:: Multivolume work

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Title:: REFLECTANCE IN SPOT BANDS AND MICROWAVE BACKSCATTERING COEFFICIENT IN C BAND AS A FUNCTION OF STAGE OF SLAKING OF BARE SOIL. Patrick BERTUZZI,Dominique COURAULT, Gérard GUYOT and Emile CHAPUIS

Document type:: Multivolume work

Structure type:: Chapter

114 REFLECTANCE IN SPOT BANDS AND MICROWAVE BACKSCATTERING COEFFICIENT IN C BAND AS A FUNCTION OF STAGE OF SLAKING OF BARE SOIL Patrick BERTUZZI 1 ,Dominique COURAULT 2 Gérard GUYOT 3 and Emile CHAPUIS 4 1 I.N.R.A., Station de Science du Sol, Domaine Saint Paul, BP 91, 84143 Montfavet Cedex, France. 2 O R S T O M., L I A. de Télédétection, 70-74 route d'Aulnay, 93163 Bondy Cedex, France 3 I.N.R.A., Station de Bioclimatologie, Domaine Saint Paul, BP 91 84143 Montfavet Cedex, France. 4 C.N.E.S, 18 avenue Edouard Belin, 31055 Toulouse Cedex, France. ABSTACT Slaking process results from the effects of rainfall impacts on soil surface. It contributes to decrease soil surface roughness. It may result in the formation of a thin and dense top soil layer which affects vertical heat, air and water fluxes. A field study was carried out to determine both : (1) the reflectance behavior in visible (XS1,XS2 SPOT bands) and near infrared (XS3 SPOT band) (2) the microwave backscatter behavior in C band and polarization HH. from bare soil as a function of degree of slaking. The experimental field (0.1 ha) was a clay loam soil initially tilled with a rotary digging machine.The tillage treatment was performed to provide a seed-bed. Artificial rainfalls was used to simulate five steps of slaking. Remote sensed data were obtained under wet and dry surface soil moisture conditions for various angles of incidence and illumination angles in the case of the optical measurements. Optimal microwave and optical configurations of the two instruments were discussed as a function of the stage of slaking. KEY WORDS: Remote sensing; Visible, Near Infrared, Microwave bands, Bare Soil, Slaking. 1. INTRODUCTION Water erosion and runoff concentration are serious factor causing soil degradation in loamy soil. Mam damages are related to the accumulation of excess surface water and the concentration of runoff in nils and gullies during rainfalls. They involve as the result of the sensitivity of loamy soil to the slaking that contributes to the structural degradation of the soil surface. Even in moderate climatic conditions, cumulative rainfall impacting involves fairly rapid and extensive degradation of the tilled soil surface causing the decrease soil roughness and infiltration capacity of soil. It may result in the formation of a thin dense top layer which limit infiltration of rain and also heat and water transfer and seedling emergence. Since several years, with the advent of airborne and spaceborne remote sensing, studies of spectral behavior of bare soil in various spectral bands have been conducted. The influence of surface roughness on the soil spectral behavior has been recongnized whatever the spectral band by many authors (Ulaby et al., 1978; Ulaby et al., 1982; Cierniewski, 1987; Curran et al., 1990). Slaking induces sensitive changes in the organization of the soil surface roughness which may produce significant changes in the spectral behavior of bare soil. Laboratory studies reported by Van der Heide and Koolen (1980) have demonstrated this for optical measurements. In this paper, we investigated under field conditions mapping feasability of stage of soil slaking using either (1) optical measurements obtained from a SPOT simulation radiometer and (2) active microwave measurements in C band. Nevertheless, whatever the spectral band, (1) mtnsic factor like the surface water content for optical and microwave measurements or (2) extrinsic factor like the solar illumination for optical measurements have an influence on the spectral response of bare soil. Consequently, to demonstrate the ability of remote sensing technique to monitor stage of slaking implies to identify the optimal configuration of measurement which gives the most sensitive variations in spectral response due to changes in soil roughness.

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