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-2 SPECTRAL SIGNATURES]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: ON THE POSSIBLE USE OF SPATIAL VARIABILITY IN AVHRR DATA TO ESTIMATE LOW LEVEL MOISTURE AND TEMPERATURE. John C. Price

Document type:: Multivolume work

Structure type:: Chapter

5. The assumption that radiometric surface temperature equals surface air temperature is not generally valid. In fact a considerable temperature discontinuity may exist in the lowest meter of the atmosphere during the day. In the present case satellite derived surface temperatures range as high as 55 C, while air temperatures, even in mid July, are mostly below 40 C. This implies that the assumed temperature distribution T(p) = T (1 - k 6p/p) is substantially incorrect. Three potential sources of additional information may be considered: a) The sounder data from the HIRS may be used to extrapolate downward through the atmosphere (Davis and Tarpley, 1983); or b) one may use reported air temperatures from weather stations, with a resultant sampling problem in many areas of the world, or c) the estimated temperature of vegetated areas may be used to approximate air temperature at shelter height (Price, 1990). The last method uses only coincident AVHRR data, but also requires further analysis because few AVHRR picture elements represent pure vegetation cover in many areas such as the U.S. Further work is needed to establish the value of the procedure describe here for routine use in computations of the energy and moisture budgets at the earth's surface. CONCLUSION A procedure has been described for relating variability of AVHRR channels 4 and 5 to moisture and temperature. The method is an approximate procedure which is probably not competitive with conventional meteorological data in many areas. Its utility in practice will depend on the ability to screen the data for clouds, and to reduce errors associated with the various approximations. The principal advantage of the method is its capability to routinely process AVHRR data for the considerable information it contains about the earth's surface energy and moisture budget, and for possible correction of vegetation index calculations for atmospheric moisture. The method needs to be verified against an independent measure after the approach has been incorporated in a conventional sounding procedure. REFERENCES Davis, P.A., and J.D. Tarpley, 1983, Estimation of shelter temperatures from operational satellite sounder data, J. of Clim. and Appl. Met., 22:369-376. Price, J.C., 1984, Land surface temperature measurements from the split window channels of the NOAA 7 Advanced Very High Resolution Radiometer, J. Geophys. Res., 89, pp 7231-7237. Price, J.C., 1990, Using spatial context in satellite data to Infer regional scale évapotranspiration, IEEE Trans, on Geosci. and Remote Sens., in press. Kleespies, T. J., and L. M. McMillan, 1987, An Extension of the Split Window Technique for the Retreival of Précipitable Water: Experimental Verification, Contribution of NESDIS Authors to the International Workshop on Remote Sensing Retreival Methods, Williamsburg, VA., pp 335-345. Kneizys, F. X., E. P. Shettle, W.O. Gallery, L. H. Chetwynd, Jr., L. W. Abreu, J.E.A. Selby, R. W. Genn, and R. A. McClatchey, 1980, Atmospheric Transmittance/Radiance: Computer Code Lowtran 5, Envir.Res. Paper 697, pp 57-60, Air Force Geophys Lab., Hanscom AFB, Mass. Price, J. C., 1989, Estimating évapotranspiration over large areas, IGARSS'89/12th Canadian Symposium on Remote Sensing, 4, pp 2138-2141. 75 V -, • ■ *'• . ' M mm,

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