University of California

Two-Dimensional Spectral Analysis of Soil Surface Temperature


M. Bazza
R. H. Shumway
D. R. Nielsen

Authors Affiliations

M. Bazza was former Graduate Student in the Department of Land, Air, and Water Resources and of the Division of Statistics, University of California, Davis, is now Professor in the Department of Hydraulics, Rabat Institute, Rabat, Morocco; R. H. Shumway was Professor in the Division of Statistics, University of California, Davis; D. R. Nielsen was Professor of Soil and Water Science in the Department of Land, Air, and Water Resources, University of California, Davis.

Publication Information

Hilgardia 56(3):1-28. DOI:10.3733/hilg.v56n03p028. June 1988.

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Soil surface temperature, measured on a 36-by-64 regular grid in a 6-hectare field, is modeled using two-dimensional spectral analysis and a signal-detection procedure. Temperature is found to behave randomly in one direction of the field (width), whereas the distribution in the other direction can be described as a superposition of four cyclic functions.

Investigation of the soil temperature’s cyclic behavior revealed that the salt content of the water applied earlier was related spatially to temperature. Different salinities of water had been applied to the field in a cyclic fashion, and co-spectral analysis yielded high correlations at certain frequencies, with higher salinities corresponding to lower temperatures and vice versa.

Literature Cited

Kennedy W. J. Jr., Gentle J. E. Statistical computing. 1980. New York: Marcel Dekker.

Morkoc F., Biggar J. W., Nielsen D. R., Rolston D. E. Analysis of soil water content and temperature using state-space approach. Soil Sci. Soc. Am. J. 1985. 49(4):798-803. July-August DOI: 10.2136/sssaj1985.03615995004900040002x [CrossRef]

Nielsen D. R., Tillotson Patricia M., Vieira S. R. Analyzing field-measured soil-water properties. Agric. Water Manage. 1983. 6:93-109. DOI: 10.1016/0378-3774(83)90002-1 [CrossRef]

Poincarré H. Calcul des probabilités. 1912. 2d ed. Paris: Gauthier-Villars.

Scheffe H. The analysis of variance. 1959. New York: Wiley.

Schmugge T. J. Effect of texture on microwave emission from soils. IEEE Trans. GeoSci. Remote Sensing. GE. 1980. 18:353-61. DOI: 10.1109/TGRS.1980.350313 [CrossRef]

Shumway R. H. Applied statistical time series analysis. 1988. Englewood Clifts: Prentice-Hall, Inc.

Snedecor G. W., Cochran W. G. Statistical methods, 5th ed. 1972. Ames: The Iowa State University Press.

Bazza M, Shumway R, Nielsen D. 1988. Two-Dimensional Spectral Analysis of Soil Surface Temperature. Hilgardia 56(3):1-28. DOI:10.3733/hilg.v56n03p028
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