C-band backscattering from corn canopies

Abstract A frequency-modulated continuous-wave C-band (4.8 GHz) scattero-meter was mounted on an aerial lift truck and backscatter coefficients of corn (Zea mays L.) were acquired as functions of polarizations, view angles and row directions. As phytomass and green-leaf area index increased, the backscatter also increased. Near anthesis, when the canopies were fully developed, the major scattering elements were located in the upper 1 m of the 2.8 m tall canopy and little backscatter was measured below that level for view angles of 30° or greater. C-band backscatter data could provide information to monitor tillage operations at small view zenith angles and vegetation at large view zenith angles.

[1]  Fawwaz T. Ulaby,et al.  Active Reflector for Radar Calibration , 1984, IEEE Transactions on Geoscience and Remote Sensing.

[2]  Gautam D. Badhwar,et al.  The use of a helicopter mounted ranging scatterometer for estimation of extinction and scattering properties of forest canopies. II. Experimental results for high-density aspen , 1988 .

[3]  T. Schmugge.  Remote Sensing of Soil Moisture: Recent Advances , 1983, IEEE Transactions on Geoscience and Remote Sensing.

[4]  Ahad Tavakoli,et al.  Microwave Propagation Constant for a Vegetation Canopy With Vertical Stalks , 1987, IEEE Transactions on Geoscience and Remote Sensing.

[5]  M. Bauer,et al.  Effects of Cultural Practices on Agronomic and Reflectance Characteristics of Soybean Canopies1 , 1982 .

[6]  N. Bunnik.  The multispectral reflectance of shortwave radiation by agricultural crops in relation with their morphological and optical properties , 1978 .

[7]  Fawwaz T. Ulaby,et al.  Relating the microwave backscattering coefficient to leaf area index , 1984 .

[8]  Shih-tseng Wu.  Preliminary Report on Measurements of Forest Canopies with C-Band Radar Scatterometer at NASA/NSTL , 1986, IEEE Transactions on Geoscience and Remote Sensing.

[9]  F. Ulaby,et al.  A reexamination of soil textural effects on microwave emission and backscattering , 1984, IEEE Transactions on Geoscience and Remote Sensing.

[10]  Fawwaz T. Ulaby,et al.  Measured microwave emission and scattering in vegetation canopies , 1984, IEEE Transactions on Geoscience and Remote Sensing.

[11]  J. Paris,et al.  Probing Thick Vegetation Canopies with a Field Microwave Scatterometer , 1986, IEEE Transactions on Geoscience and Remote Sensing.

[12]  F. Ulaby,et al.  Vegetation modeled as a water cloud , 1978 .

[13]  R. R. Allmaras,et al.  A Field Measurement of Total Porosity and Surface Microrelief of Soils1 , 1963 .

[14]  F. Ulaby,et al.  Microwave Backscatter Dependence on Surface Roughness, Soil Moisture, and Soil Texture: Part I-Bare Soil , 1978, IEEE Transactions on Geoscience Electronics.