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Effects of soil moisture on correlation lengths of scattered fields from bare ground

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Il Nuovo Cimento C

Summary

In this communication radar scattering data from bare ground having a range of surface roughness from 1.1 r.m.s. cm to 4.1 r.m.s. cm height and a range of soil moisture from 0.1 g/cm3 to 0.34 g/cm3 were analysed. It was shown that the representation of the data in terms of the nadir cross-section and an effective correlation parameter is effective in differentiating the effects of soil moisture and surface roughness through the frequency range of 1.1 GHz to 7.25 GHz.

Riassunto

In questo lavoro si sono analizzati i dati di diffusione radar dal nudo terreno con un intervallo di rugosità superficiale compreso tra 1.1 r.m.s. cm e 4.1 r.m.s. cm di altezza ed un intervallo di umidità del suolo compreso tra 0.1 g/cm3 e 0.24 g/cm3. Si è mostrato che la rappresentazione dei dati sulle basi delle sezioni d'urto del nadir e di un effettivo parametro di correlazione è efficace nel differenziare gli effetti di umidità del suolo e della rugosità della superficie entro l'intervallo di frequenza compreso tra 1.1 GHz e 7.25 GHz.

Резюме

В этой статье анализируются данные по рассеянию радарного излучения на голой земле, обладающей шероховатостью поверхности в области от 1.1 r.m.s. см до 4.1 r.m.s. см по высоте и в области влажности почвы от 0.1 г/см3 до 0.34 г/см3. Показывается, что представление данных в терминах поперечного сечения надира и эффективного параметра корреляции позволяет дифференцировать эффекты влажности почвы и шероховатости поверхности в области частот от 1.1 Ггц до 7.25 Ггц.

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References

  1. R. W. Newton:Microwave remote sensing and its application to soil moisture detection, NASA, January 1977, NAS G-13904.

  2. P. Batlivala andF. L. Ulaby:Feasibility of monitoring soil moisture using active microwave remote sensing, Kansas, June 1977, RSL 264-12, NAS G-14052.

  3. J. Ciblar andF. T. Ulaby:Dielectric properties of soils of a function of moisture content, University of Kansas report, CRES 177-47, November 1974.

  4. P. Batlivala andF. Ulaby:Effects of roughness on the radar response to soil moisture of bare ground, University of Kansas Report RSL 264-5, September 1975.

  5. G. Ruck:Radar Cross-Section Handbook (New York, N. Y., 1970), p. 703.

  6. M. Long:Radar Reflectivity of Land and Sea (Lexington, Mass., 1975).

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  8. A. C. Schell:IEEE Trans. Antennas Propag., AP-15, 187 (1967).

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This work was carried on leave at the NASA/Goddard Space Flight Center during the summers of 1976 and 1977.

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Kritikos, H.N. Effects of soil moisture on correlation lengths of scattered fields from bare ground. Il Nuovo Cimento C 3, 355–364 (1980). https://doi.org/10.1007/BF02510161

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  • DOI: https://doi.org/10.1007/BF02510161

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