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

Bibliographic data

Multivolume work

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

Structure type:: Chapter

Chapter

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

3.3 Optical measurements The effects of intnsic parameter of the soil surface (here soil moisture) observed under varying extrinsic conditions of measurement (spectral band, angle of incidence, solar illumination angle) are to be discriminated in order to establish the most sensitive and optimal conditions to detect soil surface changes due to slaking. Whatever the configuration of the instrument, it is clear, as shown in Figure 5, that the wet condition of soil moisture is not appropriated to discriminate stages of slaking. Soil moisture decreases reflectance level. Wet condition produce unsensitive and quite constant measurements. In dry condition, the reflectance globally increases with the stage of slaking as the Tortuosity index decreases. The effect of the solar illumination angle is shown in Figure 6. Whatever the spectral bands, it affects the reflectance level. At 6.00 am or 6.00 pm, the presence of shadows decreases the reflectance level. But it does not seem to affect the spectral discrimination of stage of slaking although some obtained experimental relationships are not continuously decreasing. Nevertheless, the most satisfactory relationships are obtained at midday whatever the spectral band and the XS3 band seems to be more interesting to detect changes in stage of slaking. The reflectance level is also affected by the chosen angle of incidence (0* or 23*). But, the relationships obtained at 23 s exhibit quite similar behaviors which do not modify conclusions discussed previously. 4. CONCLUSIONS We have observed in controlled conditions that it is possible to discriminate stage of slaking on the based of multitemporal remote sensed data. For practical purposes, the possibility of slaking survey using active microwave remote sensing is heavily improbable. It is limited to a narrow configuration of the instrument only compatible with the use of an airborne system which will necessary have a limited spatial resolution. Thus, the greatest penetration depth of microwave renders the discrimination of slaking more dependent on soil moisture conditions in the near surface soil layers. Optical remote sensing technique seems to be more promising. Nevertheless, further studies will be necessary to study the effect of the initial soil roughness condition. The new measuring programs will also include various azimuthal viewing angles for the optical measurements. These studies will provide useful informations to be incorporated for the explanations of multitemporal SPOT images in order to assess soil erosion inventories. 5 REFERENCES Bertuzzi P., Bruckler. L., Gabilly, Y. and Gaudu, J.C., 1987. Calibration, field testing and error analysys of a gamma-ray probe for in situ measurement of dry bulk density, Soil Science, 144(6): 425-436. Bertuzzi, P., Caussignac, J.M., Stengel, P., Morel, G., Lorendeau, J.Y., and Pelloux, G., 1990a. An automated non contact Laser profile meter for measuring soil roughness in situ. Soil Science 149(3), in press, 8pp. Bertuzzi, P., Rauws, G. and Courault, D., 1990b. Testing roughness indices to estimate soil roughness changes due to simulated rainfall. Soil k Till., in press, 13 pp Boiffin, J., 1984. La degradation structurale des couches superficielles sous l'action des pluies. Thèse de Docteur-Ingénieur, Inst. Nat. Agron., Paris, 128 pp. Boiffin, J., 1986. Stages and time - dependency of soil crusting in situ. In: Assessment of soil surface sealing and crusting, Callebaut, F.; Gabriels, D. and De Boodt, M. (Editors), Flanders Research Center for Soil Erosion and Soil Conservation, Ghent, 91-98. Cierniewski, J., 1987. A model for soil surface roughness influence on the spectral response of bare soil in the visible and near infrared range. Remote sensing of environment, 115: 23-97. Curran, P.J., Foody, G.M., Kondratyev, K.Ya., Kozoderov, V.V. and Fedchenko, PP., 1990. Reflectance of soil in the laboratory and field. In Remote Sensing of soil and vegetation in the USSR, edited by Taylor k Francis Ltd, London, Great Britain, pp 63-82. Guyot, G., Hannocq, J. F., Saint, G. and Buis, J. P., (1984). Mise au point d'un radiomètre de simulation SPOT, m Proceedings of 2 nd Int. Coll, on Spectral Signatures of Objects in Remote Sensing, held in Bordeaux, France, 12-16 Septembre 1983, edited by "Les colloques de l'INRA", INRA Publications, Pans, France, 23: 153-157. Ulaby, F.T., Batlivala, P.P. and Dobson, M.C., 1978. Microwave backscatter dependence on surface roughness, soil moisture and soil texture. IEEE Trans. Geos. Rem. Sens., 16: 286-295. Ulaby, F.T., Moore, R.K. and FUNG, A., 1982. Physical mechanisms and empirical models for scattering and emission. In Microwave remote sensing, Active and Passive, Volume II edited by Addison-Wesley Publishing Company, Reading, Massachusetts, USA, pp 816-921. Van der Heide, G. and Koolen, A.J., 1980. Soil surface albedo and multispectral reflectance of short-wave radiation as a function of degree of soil slaking. Neth. J. Agric. Sci., 28: 252-258. 119

Access restriction

Copyright

fullscreen: Proceedings of the Symposium on Global and Environmental Monitoring (Part 1)

Multivolume work

Volume

Chapter

Chapter

Table of contents

Cite and reuse

Volume

Chapter

Image

Image fragment

Citation links

Citation recommendation