A simplistic incidence angle approach to retrieve the soil moisture and surface roughness at X-band

Nowadays, it is an important point of research to classify the moisture and roughness using microwave data with less complex models. For this purpose, microwave measurements were conducted for observing roughness and soil moisture at X-band (9.5 GHz). These measurements were carried out over a range of incidence angle from 20/spl deg/ to 70/spl deg/ at the step of 5/spl deg/ for both polarizations (i.e., horizontal (H) and vertical (V) polarizations). Surface roughness (i.e., root mean square height) and moisture were varied in controlled conditions. Microwave emissivity has been derived with the measurements of reflectivity from a microwave system. Results show a good angular variation of emissivity with surface roughness and moisture for both polarizations. An algorithm is developed using incidence angle as a modulating factor for retrieving the soil moisture and surface roughness at X-band. A good agreement between observed and retrieved surface roughness (i.e., standard error; SE-0.066 for H-polarization) and soil moisture (SE-0.045 for H-polarization) has been obtained by the proposed model.

[1]  James R. Wang,et al.  Multifrequency Measurements of the Effects of Soil Moisture, Soil Texture, And Surface Roughness , 1983, IEEE Transactions on Geoscience and Remote Sensing.

[2]  Jean-Pierre Wigneron,et al.  Retrieval of crop biomass and soil moisture from measured 1.4 and 10.65 GHz brightness temperatures , 2002, IEEE Trans. Geosci. Remote. Sens..

[3]  Yann Kerr,et al.  A simple parameterization of the L-band microwave emission from rough agricultural soils , 2001, IEEE Trans. Geosci. Remote. Sens..

[4]  Thomas J. Jackson,et al.  Research toward an operational passive microwave remote sensing system for soil moisture , 1988 .

[5]  Hiroyoshi Yamada,et al.  Response of Microwave on Bare Soil Moisture and Surface Roughness by X-Band Scatterometer , 2000 .

[6]  Jeffrey P. Walker,et al.  A methodology for surface soil moisture and vegetation optical depth retrieval using the microwave polarization difference index , 2001, IEEE Trans. Geosci. Remote. Sens..

[7]  D Singh,et al.  Effect of vegetation biomass on microwave emissivity at X-band , 1999 .

[8]  T. Mo,et al.  Calculations of the Microwave Brightness Temperature of Rough Soil Surfaces: Bare Field , 1987, IEEE Transactions on Geoscience and Remote Sensing.

[9]  F. Ulaby,et al.  Microwave Dielectric Behavior of Wet Soil-Part 1: Empirical Models and Experimental Observations , 1985, IEEE Transactions on Geoscience and Remote Sensing.

[10]  E. Njoku,et al.  Passive microwave remote sensing of soil moisture , 1996 .

[11]  Thuy Le Toan,et al.  The effect of surface roughness on multifrequency polarimetric SAR data , 1997, IEEE Trans. Geosci. Remote. Sens..

[12]  H. Haario,et al.  Theory and Applications of Inverse Problems , 1988 .

[13]  Yisok Oh,et al.  Condition for precise measurement of soil surface roughness , 1998, IEEE Trans. Geosci. Remote. Sens..

[14]  Jean-Pierre Wigneron,et al.  Estimation of soil microwave effective temperature at L and C bands , 1997, IEEE Trans. Geosci. Remote. Sens..

[15]  Thomas Schmugge,et al.  Passive Microwave Soil Moisture Research , 1986, IEEE Transactions on Geoscience and Remote Sensing.

[16]  N. Bruguier,et al.  A simple algorithm to retrieve soil moisture and vegetation biomass using passive microwave measurements over crop fields , 1995 .

[17]  J. Kong,et al.  Theory of microwave remote sensing , 1985 .

[18]  Roger D. De Roo,et al.  A semi-empirical backscattering model at L-band and C-band for a soybean canopy with soil moisture inversion , 2001, IEEE Trans. Geosci. Remote. Sens..

[19]  Richard W. Newton,et al.  Utilization of vegetation indices to improve microwave soil moisture estimates over agricultural lands , 1984, IEEE Transactions on Geoscience and Remote Sensing.

[20]  Fawwaz T. Ulaby,et al.  Effects of Vegetation Cover on the Radar Sensitivity to Soil Moisture , 1982, IEEE Transactions on Geoscience and Remote Sensing.

[21]  B. Choudhury,et al.  Effect of surface roughness on the microwave emission from soils , 1979 .

[22]  T. Mo,et al.  A Parameterization of the Effect of Surface Roughness on Microwave Emission , 1987, IEEE Transactions on Geoscience and Remote Sensing.

[23]  Malcolm Davidson,et al.  On the characterization of agricultural soil roughness for radar remote sensing studies , 2000, IEEE Trans. Geosci. Remote. Sens..

[24]  B. Choudhury,et al.  Remote sensing of soil moisture content over bare field at 1.4 GHz frequency , 1981 .

[25]  K. P. Singh,et al.  Response of microwave scattering from crop (wheat) and crop covered soil moisture for remote sensing , 2001 .

[26]  Yann Kerr,et al.  Soil moisture retrieval from space: the Soil Moisture and Ocean Salinity (SMOS) mission , 2001, IEEE Trans. Geosci. Remote. Sens..

[27]  A. Fung.  Microwave Scattering and Emission Models and their Applications , 1994 .

[28]  Yang Du,et al.  Sensitivity to soil moisture by active and passive microwave sensors , 2000, IEEE Trans. Geosci. Remote. Sens..

[29]  Jouni Pulliainen,et al.  Development of geophysical retrieval algorithms for the MIMR , 1993, IEEE Trans. Geosci. Remote. Sens..

[30]  E. Engman,et al.  Status of microwave soil moisture measurements with remote sensing , 1995 .

[31]  W. Peake.  Interaction of electromagnetic waves with some natural surfaces , 1959 .

[32]  Thomas J. Jackson,et al.  Passive microwave remote sensing of soil moisture: results from HAPEX, FIFE and MONSOON 90 , 1992 .

[33]  Li Li,et al.  Retrieval of land surface parameters using passive microwave measurements at 6-18 GHz , 1999, IEEE Trans. Geosci. Remote. Sens..